CMA


Line plots across dimensions of each concept
Tables

Table of contents



us-gaap:CommonStockValue

us-gaap:CommonStockSharesIssued
us-gaap:StatementEquityComponents
us-gaap:CommonStockSharesOutstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic

us-gaap:EarningsPerShareBasic

us-gaap:EarningsPerShareDiluted

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
us-gaap:ProductOrService
us-gaap:ProductOrService, us-gaap:StatementBusinessSegments
us-gaap:StatementBusinessSegments

us-gaap:InterestExpense

us-gaap:InterestExpenseLongTermDebt

us-gaap:IncomeTaxExpenseBenefit
us-gaap:StatementBusinessSegments
us-gaap:VariableInterestEntitiesByClassificationOfEntity

us-gaap:IncomeTaxesPaidNet

us-gaap:ProfitLoss
us-gaap:StatementBusinessSegments
us-gaap:StatementEquityComponents

us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest

us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic

us-gaap:Assets

us-gaap:Liabilities

us-gaap:LiabilitiesAndStockholdersEquity

us-gaap:CashAndCashEquivalentsAtCarryingValue

us-gaap:PropertyPlantAndEquipmentNet

us-gaap:DeferredTaxAssetsLiabilitiesNet

us-gaap:LongTermDebt
us-gaap:ConsolidatedEntities
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByMeasurementBasis

us-gaap:CommonStockValue

us-gaap:RetainedEarningsAccumulatedDeficit

us-gaap:TreasuryStockValue

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:ProfitLoss
us-gaap:StatementBusinessSegments
us-gaap:StatementEquityComponents

us-gaap:IncreaseDecreaseInOtherOperatingCapitalNet

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:ProceedsFromIssuanceOfLongTermDebt

us-gaap:PaymentsForRepurchaseOfCommonStock

us-gaap:ShareBasedCompensation

us-gaap:UnrecognizedTaxBenefits

us-gaap:DeferredTaxAssetsValuationAllowance

us-gaap:ProceedsFromRepaymentsOfShortTermDebt

cma:CardFees

cma:CommercialLendingFees
us-gaap:DerivativeInstrumentRisk
cma:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetRealizedGainLossIncludedInEarnings
us-gaap:DerivativeInstrumentRisk
cma:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetUnrealizedGainLossIncludedInEarnings

cma:Fiduciaryincome

cma:IncomeLossFromContinuingOperationsBeforeIncomeTaxes

cma:InterestAndDividendIncomeSecuritiesAFSAndHTM
us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, cma:DerivativePurpose
cma:Interestexpenseonhedgedmediumandlongtermdebt

cma:LetterOfCreditFees

cma:NetIncreaseInFixedAssets

cma:NumberOfGeographicMarkets

cma:NumberOfMajorBusinessSegments

cma:OtherComprehensiveIncomeLossReclassificationAdjustmentPensionAndOtherPostretirementBenefitPlansRecognizedInNetPeriodicDefinedBenefitCostBeforeTax

cma:OtherComprehensiveIncomeLossReclassificationAdjustmentPensionAndOtherPostretirementBenefitPlansRecognizedInNetPeriodicDefinedBenefitCostTax

cma:Othersourcesofnoninterestincome
us-gaap:StatementBusinessSegments

cma:OutsideProcessingFeeExpense

cma:Servicechargesondepositaccounts

cma:ShareawardsexcludedfromthecalculationofdilutedEPSbecauseinclusionwouldbeantidilutiveduetonetloss

cma:SoftwareExpenses

cma:Stockoptionsexcludedbecauseexercisepricesweregreaterthanaveragemarketpriceofshares
us-gaap:RetirementPlanType
cma:Totalothercomponentsofnetbenefitcreditorcost

us-gaap:AccretionAmortizationOfDiscountsAndPremiumsInvestments

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
us-gaap:StatementEquityComponents

us-gaap:AdvertisingExpense
us-gaap:VariableInterestEntitiesByClassificationOfEntity, cma:TaxCreditsandBenefitsRelatedToTaxCreditEntities
us-gaap:AffordableHousingTaxCreditsAndOtherTaxBenefitsAmount
us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType
us-gaap:AllowanceForLoanAndLeaseLossesWriteoffsNet
us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType, us-gaap:FinancingReceivablePortfolioSegment
us-gaap:VariableInterestEntitiesByClassificationOfEntity, cma:TaxCreditsandBenefitsRelatedToTaxCreditEntities
us-gaap:AmortizationMethodQualifiedAffordableHousingProjectInvestmentsAmortization
us-gaap:FinancialInstrument
us-gaap:AvailableForSaleSecuritiesGrossRealizedGainLossNet
us-gaap:FinancialInstrument
us-gaap:AvailableForSaleSecuritiesGrossRealizedGains
us-gaap:FinancialInstrument
us-gaap:AvailableForSaleSecuritiesGrossRealizedLosses

us-gaap:BankOwnedLifeInsuranceIncome

us-gaap:BrokerageCommissionsRevenue

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect
us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, cma:DerivativePurpose
us-gaap:ChangeInUnrealizedGainLossOnFairValueHedgingInstruments1

us-gaap:CommonStockDividendsPerShareDeclared

us-gaap:DebtAndEquitySecuritiesGainLoss

us-gaap:DeferredIncomeTaxExpenseBenefit
us-gaap:RetirementPlanType, cma:DefinedBenefitsComponents
us-gaap:DefinedBenefitPlanAmortizationOfGainsLosses
us-gaap:RetirementPlanType, cma:DefinedBenefitsComponents
us-gaap:DefinedBenefitPlanAmortizationOfPriorServiceCostCredit
us-gaap:RetirementPlanType, cma:DefinedBenefitsComponents
us-gaap:DefinedBenefitPlanExpectedReturnOnPlanAssets
us-gaap:RetirementPlanType, cma:DefinedBenefitsComponents
us-gaap:DefinedBenefitPlanInterestCost

us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost
us-gaap:RetirementPlanType
us-gaap:RetirementPlanType, cma:DefinedBenefitsComponents
us-gaap:DefinedBenefitPlanServiceCost

us-gaap:DepreciationAndAmortization
cma:DerivativePurpose
us-gaap:DerivativeGainLossOnDerivativeNet
us-gaap:DerivativeInstrumentRisk, us-gaap:IncomeStatementLocation, cma:DerivativePurpose

us-gaap:DividendsCommonStockCash
us-gaap:StatementEquityComponents

us-gaap:EquipmentExpense
us-gaap:DerivativeInstrumentRisk
us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements

us-gaap:FederalDepositInsuranceCorporationPremiumExpense
us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType
us-gaap:FinancingReceivableAllowanceForCreditLossesRecovery
us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType, us-gaap:FinancingReceivablePortfolioSegment
us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType
us-gaap:FinancingReceivableAllowanceForCreditLossesWriteOffs
us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType, us-gaap:FinancingReceivablePortfolioSegment
us-gaap:LoanRestructuringModification
us-gaap:FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1

us-gaap:ForeignCurrencyTransactionGainLossBeforeTax

us-gaap:GainLossOnForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstruments

us-gaap:IncreaseDecreaseInAccruedLiabilities

us-gaap:IncreaseDecreaseInDeposits

us-gaap:IncreaseDecreaseInInterestAndDividendsReceivable

us-gaap:IncrementalCommonSharesAttributableToShareBasedPaymentArrangements

us-gaap:InterestAndDividendIncomeOperating

us-gaap:InterestAndFeeIncomeLoansAndLeasesHeldInPortfolio

us-gaap:InterestExpenseDeposits

us-gaap:InterestExpenseShortTermBorrowings

us-gaap:InterestIncomeExpenseAfterProvisionForLoanLoss

us-gaap:InterestIncomeExpenseNet
us-gaap:StatementBusinessSegments

us-gaap:InterestPaid

us-gaap:LaborAndRelatedExpense

us-gaap:LegalFees

us-gaap:NoninterestExpense
us-gaap:StatementBusinessSegments

us-gaap:NoninterestIncome
us-gaap:StatementBusinessSegments

us-gaap:NoninterestIncomeOtherOperatingIncome
us-gaap:VariableInterestEntitiesByClassificationOfEntity

us-gaap:OccupancyNet

us-gaap:OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax

us-gaap:OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax

us-gaap:OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax

us-gaap:OtherComprehensiveIncomeLossNetOfTax
us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax

us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax

us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax

us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax

us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesBeforeTax

us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax

us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesTax

us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax

us-gaap:OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax

us-gaap:OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax

us-gaap:OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax

us-gaap:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax

us-gaap:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax

us-gaap:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax

us-gaap:OtherInterestAndDividendIncome

us-gaap:OtherNoninterestExpense

us-gaap:PaymentsForProceedsFromLoansAndLeases

us-gaap:PaymentsOfDividendsCommonStock

us-gaap:PaymentsToAcquireAvailableForSaleSecurities

us-gaap:PaymentsToAcquireFederalHomeLoanBankStock

us-gaap:ProceedsFromIssuanceOfCommonStock

us-gaap:ProceedsFromLifeInsurancePolicies

us-gaap:ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities

us-gaap:ProceedsFromSaleOfAvailableForSaleSecurities

us-gaap:ProvisionForLoanLeaseAndOtherLosses
us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType
us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType, us-gaap:FinancingReceivablePortfolioSegment
us-gaap:InvestmentType
us-gaap:StatementBusinessSegments
us-gaap:StatementEquityComponents
us-gaap:StockIssuedDuringPeriodSharesShareBasedCompensation

us-gaap:StockIssuedDuringPeriodValueShareBasedCompensation
us-gaap:StatementEquityComponents
us-gaap:StatementEquityComponents
us-gaap:TreasuryStockSharesAcquired

us-gaap:TreasuryStockValueAcquiredCostMethod
us-gaap:StatementEquityComponents

us-gaap:UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted

cma:AllowanceForOffBalanceSheetCreditLosses

cma:AverageBalanceDuringPeriodDeposits
us-gaap:StatementBusinessSegments

cma:AverageBalanceDuringPeriodLoansAndLeasesReceivableNetOfDeferredIncome
us-gaap:StatementBusinessSegments

cma:CarryingValueOfStandbyAndCommercialLettersOfCredit

cma:CarryingValueOfStandbyAndCommercialLettersOfCreditIncludedInAllowanceForCreditLossesOnLendingRelatedCommitments

cma:CarryingValueOfStandbyAndCommercialLettersOfCreditIncludedInDeferredFees

cma:CarryingValueOfUnusedCommitmentsToExtendCredit
us-gaap:BalanceSheetLocation, us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, cma:DerivativePurpose
cma:Carryingvalueofhedgeditem
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis
cma:CreditRelatedFinancialInstruments
us-gaap:FairValueByMeasurementBasis

cma:Cumulativeeffectofchangeinaccountingprinciple
us-gaap:AdjustmentsForNewAccountingPronouncements, us-gaap:StatementEquityComponents
us-gaap:StatementEquityComponents
us-gaap:AdjustmentsForNewAccountingPronouncements
cma:Dayonedecreaseintheoverallallowanceforcreditlosses

cma:DepositsCustomerCertificatesDeposits
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByMeasurementBasis

cma:EfficiencyRatio
us-gaap:StatementBusinessSegments
us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType
cma:FinancingReceivableRatioOfAllowanceForCreditLossesToAllLoans
us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType, us-gaap:FinancingReceivablePortfolioSegment

cma:FinancingReceivableRevolvingConvertedtoTerm
us-gaap:ClassOfFinancingReceivableTypeOfBorrower, us-gaap:FinancingReceivablePortfolioSegment
us-gaap:ClassOfFinancingReceivableTypeOfBorrower, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
us-gaap:ClassOfFinancingReceivableTypeOfBorrower, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:GeographicDistribution
us-gaap:ClassOfFinancingReceivableTypeOfBorrower, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:GeographicDistribution, us-gaap:InternalCreditAssessment
us-gaap:ClassOfFinancingReceivableTypeOfBorrower, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:InternalCreditAssessment
us-gaap:ClassOfFinancingReceivableTypeOfBorrower, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:GeographicDistribution
us-gaap:ClassOfFinancingReceivableTypeOfBorrower, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:GeographicDistribution, us-gaap:InternalCreditAssessment
us-gaap:FinancingReceivablePortfolioSegment
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:InternalCreditAssessment
us-gaap:AdjustmentsForNewAccountingPronouncements
cma:Increaseinretailloansallowanceforcreditlosses
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis
cma:InterestBearingDepositLiabilitiesOtherTimeDeposit
us-gaap:FairValueByMeasurementBasis

cma:LeasesReceivableCommercialLeaseFinancingNetOfDeferredIncome

cma:LoansAndLeasesReceivableConsumerLoansNetOfDeferredIncome

cma:LoansAndLeasesReceivableConsumerMortgageNetOfDeferredIncome

cma:LoansAndLeasesReceivableForeignNetOfDeferredIncomeOther

cma:LoansReceivableCommercialFinancialAndAgriculturalNetOfDeferredIncome

cma:LoansReceivableCommercialMortgageNetOfDeferredIncome

cma:NetCreditRelatedChargeOffs
us-gaap:StatementBusinessSegments

cma:NotionalAmountOfDerivativeCreditRiskParticipationAgreements

cma:OtherTimeDeposits
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByMeasurementBasis

cma:RealEstateConstructionLoansNetOfDeferredIncome
us-gaap:AdjustmentsForNewAccountingPronouncements
cma:Reductioninbusinessloansallowanceforcreditlosses

cma:ReturnOnAverageAssets
us-gaap:StatementBusinessSegments

cma:RiskParticipationsCoveringStandbyAndCommercialLettersOfCredit

cma:SegmentReportingAverageAssets
us-gaap:StatementBusinessSegments

cma:TotalInternallyClassifiedWatchListLettersOfCredit

cma:WatchListLettersOfCreditAsPercentageOfTotalLettersOfCredit

us-gaap:AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax

us-gaap:AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax

us-gaap:AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax

us-gaap:AdditionalPaidInCapitalCommonStock
us-gaap:FairValueByMeasurementBasis
us-gaap:AlternativeInvestment
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:AssetsFairValueDisclosure
us-gaap:FairValueByMeasurementFrequency

us-gaap:AvailableForSaleSecurities

us-gaap:AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
us-gaap:FinancialInstrument

us-gaap:AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
us-gaap:FinancialInstrument

us-gaap:AvailableForSaleSecuritiesAmortizedCost
us-gaap:FinancialInstrument
us-gaap:FinancialInstrument, us-gaap:ManagingRisksInherentInServicingAssetsAndServicingLiabilitiesByTypeOfRisk

us-gaap:AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss
us-gaap:FinancialInstrument

us-gaap:AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss
us-gaap:FinancialInstrument

us-gaap:AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
us-gaap:FinancialInstrument

us-gaap:AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss
us-gaap:FinancialInstrument

us-gaap:AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
us-gaap:FinancialInstrument

us-gaap:AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
us-gaap:FinancialInstrument
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis
us-gaap:BankAcceptancesExecutedAndOutstanding
us-gaap:FairValueByMeasurementBasis

us-gaap:CashAndDueFromBanks
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByMeasurementBasis

us-gaap:CreditDerivativeMaximumExposureUndiscounted
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:DeferredCompensationLiabilityCurrentAndNoncurrent
us-gaap:FairValueByMeasurementFrequency

us-gaap:DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal

us-gaap:Deposits
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByMeasurementBasis

us-gaap:DepositsMoneyMarketDepositsAndNegotiableOrderOfWithdrawalNOW

us-gaap:DepositsSavingsDeposits

us-gaap:DerivativeAssetCollateralObligationToReturnCashOffset

us-gaap:DerivativeAssetFairValueGrossLiability

us-gaap:DerivativeAssets
us-gaap:BalanceSheetLocation, us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, cma:DerivativePurpose
us-gaap:DerivativeAverageFixedInterestRate
us-gaap:BalanceSheetLocation, us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, cma:DerivativePurpose
us-gaap:DerivativeAverageVariableInterestRate

us-gaap:DerivativeCollateralObligationToReturnSecurities

us-gaap:DerivativeCollateralRightToReclaimSecurities

us-gaap:DerivativeCreditRiskValuationAdjustmentDerivativeAssets

us-gaap:DerivativeFairValueOfDerivativeAsset

us-gaap:DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral

us-gaap:DerivativeFairValueOfDerivativeLiability
cma:DerivativePurpose
us-gaap:DerivativeInstrumentRisk, cma:DerivativePurpose
us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:HedgingDesignation, cma:DerivativePurpose
us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByMeasurementFrequency
us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation, cma:DerivativePurpose
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByMeasurementFrequency

us-gaap:DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral

us-gaap:DerivativeLiabilities

us-gaap:DerivativeLiabilityCollateralRightToReclaimCashOffset

us-gaap:DerivativeLiabilityFairValueGrossAsset

us-gaap:DerivativeNotionalAmount
cma:DerivativePurpose
us-gaap:BalanceSheetLocation, us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, cma:DerivativePurpose
us-gaap:DerivativeInstrumentRisk, cma:DerivativePurpose
us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:HedgingDesignation, cma:DerivativePurpose
us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation, cma:DerivativePurpose
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis
us-gaap:DueFromCustomerAcceptances
us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument
us-gaap:EquitySecuritiesFvNi
us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument
us-gaap:DerivativeInstrumentRisk
us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue

us-gaap:FederalHomeLoanBankAdvancesLongTerm
us-gaap:ConsolidatedEntities
us-gaap:ConsolidatedEntities, us-gaap:DebtInstrument
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis
us-gaap:FederalHomeLoanBankStockAndFederalReserveBankStock
us-gaap:FairValueByMeasurementBasis

us-gaap:FinancialInstrumentsOwnedAndPledgedAsCollateralAtFairValue
us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType
us-gaap:FinancingReceivableAllowanceForCreditLosses
us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType, us-gaap:FinancingReceivablePortfolioSegment
us-gaap:InvestmentType
us-gaap:ClassOfFinancingReceivableTypeOfBorrower, us-gaap:EquitySecuritiesByIndustry, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:GeographicDistribution, us-gaap:LoanRestructuringModification
us-gaap:FinancingReceivableModificationsRecordedInvestment
us-gaap:ClassOfFinancingReceivableTypeOfBorrower, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:GeographicDistribution, us-gaap:LoanRestructuringModification
us-gaap:ClassOfFinancingReceivableTypeOfBorrower, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:LoanRestructuringModification
us-gaap:LoanRestructuringModification

us-gaap:FinancingReceivableNonaccrualNoAllowance
us-gaap:ClassOfFinancingReceivableTypeOfBorrower, us-gaap:EquitySecuritiesByIndustry, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:GeographicDistribution
us-gaap:ClassOfFinancingReceivableTypeOfBorrower, us-gaap:FinancingReceivablePortfolioSegment
us-gaap:ClassOfFinancingReceivableTypeOfBorrower, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
us-gaap:ClassOfFinancingReceivableTypeOfBorrower, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:GeographicDistribution
us-gaap:ClassOfFinancingReceivableTypeOfBorrower, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:GeographicDistribution
us-gaap:ClassOfFinancingReceivableTypeOfBorrower, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:GeographicDistribution, cma:LoanClassification
us-gaap:FinancingReceivablePortfolioSegment

us-gaap:FinancingReceivableOriginatedFiveOrMoreYearsBeforeLatestFiscalYear
us-gaap:ClassOfFinancingReceivableTypeOfBorrower, us-gaap:FinancingReceivablePortfolioSegment
us-gaap:ClassOfFinancingReceivableTypeOfBorrower, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
us-gaap:ClassOfFinancingReceivableTypeOfBorrower, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:GeographicDistribution
us-gaap:ClassOfFinancingReceivableTypeOfBorrower, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:GeographicDistribution, us-gaap:InternalCreditAssessment
us-gaap:ClassOfFinancingReceivableTypeOfBorrower, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:InternalCreditAssessment
us-gaap:ClassOfFinancingReceivableTypeOfBorrower, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:GeographicDistribution
us-gaap:ClassOfFinancingReceivableTypeOfBorrower, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:GeographicDistribution, us-gaap:InternalCreditAssessment
us-gaap:FinancingReceivablePortfolioSegment
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:InternalCreditAssessment

us-gaap:FinancingReceivableOriginatedFourYearsBeforeLatestFiscalYear
us-gaap:ClassOfFinancingReceivableTypeOfBorrower, us-gaap:FinancingReceivablePortfolioSegment
us-gaap:ClassOfFinancingReceivableTypeOfBorrower, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
us-gaap:ClassOfFinancingReceivableTypeOfBorrower, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:GeographicDistribution
us-gaap:ClassOfFinancingReceivableTypeOfBorrower, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:GeographicDistribution, us-gaap:InternalCreditAssessment
us-gaap:ClassOfFinancingReceivableTypeOfBorrower, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:InternalCreditAssessment
us-gaap:ClassOfFinancingReceivableTypeOfBorrower, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:GeographicDistribution
us-gaap:ClassOfFinancingReceivableTypeOfBorrower, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:GeographicDistribution, us-gaap:InternalCreditAssessment
us-gaap:FinancingReceivablePortfolioSegment
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:InternalCreditAssessment

us-gaap:FinancingReceivableOriginatedInCurrentFiscalYear
us-gaap:ClassOfFinancingReceivableTypeOfBorrower, us-gaap:FinancingReceivablePortfolioSegment
us-gaap:ClassOfFinancingReceivableTypeOfBorrower, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
us-gaap:ClassOfFinancingReceivableTypeOfBorrower, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:GeographicDistribution
us-gaap:ClassOfFinancingReceivableTypeOfBorrower, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:GeographicDistribution, us-gaap:InternalCreditAssessment
us-gaap:ClassOfFinancingReceivableTypeOfBorrower, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:InternalCreditAssessment
us-gaap:ClassOfFinancingReceivableTypeOfBorrower, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:GeographicDistribution
us-gaap:ClassOfFinancingReceivableTypeOfBorrower, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:GeographicDistribution, us-gaap:InternalCreditAssessment
us-gaap:FinancingReceivablePortfolioSegment
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:InternalCreditAssessment

us-gaap:FinancingReceivableOriginatedInFiscalYearBeforeLatestFiscalYear
us-gaap:ClassOfFinancingReceivableTypeOfBorrower, us-gaap:FinancingReceivablePortfolioSegment
us-gaap:ClassOfFinancingReceivableTypeOfBorrower, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
us-gaap:ClassOfFinancingReceivableTypeOfBorrower, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:GeographicDistribution
us-gaap:ClassOfFinancingReceivableTypeOfBorrower, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:GeographicDistribution, us-gaap:InternalCreditAssessment
us-gaap:ClassOfFinancingReceivableTypeOfBorrower, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:InternalCreditAssessment
us-gaap:ClassOfFinancingReceivableTypeOfBorrower, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:GeographicDistribution
us-gaap:ClassOfFinancingReceivableTypeOfBorrower, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:GeographicDistribution, us-gaap:InternalCreditAssessment
us-gaap:FinancingReceivablePortfolioSegment
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:InternalCreditAssessment

us-gaap:FinancingReceivableOriginatedThreeYearsBeforeLatestFiscalYear
us-gaap:ClassOfFinancingReceivableTypeOfBorrower, us-gaap:FinancingReceivablePortfolioSegment
us-gaap:ClassOfFinancingReceivableTypeOfBorrower, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
us-gaap:ClassOfFinancingReceivableTypeOfBorrower, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:GeographicDistribution
us-gaap:ClassOfFinancingReceivableTypeOfBorrower, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:GeographicDistribution, us-gaap:InternalCreditAssessment
us-gaap:ClassOfFinancingReceivableTypeOfBorrower, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:InternalCreditAssessment
us-gaap:ClassOfFinancingReceivableTypeOfBorrower, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:GeographicDistribution
us-gaap:ClassOfFinancingReceivableTypeOfBorrower, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:GeographicDistribution, us-gaap:InternalCreditAssessment
us-gaap:FinancingReceivablePortfolioSegment
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:InternalCreditAssessment

us-gaap:FinancingReceivableOriginatedTwoYearsBeforeLatestFiscalYear
us-gaap:ClassOfFinancingReceivableTypeOfBorrower, us-gaap:FinancingReceivablePortfolioSegment
us-gaap:ClassOfFinancingReceivableTypeOfBorrower, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
us-gaap:ClassOfFinancingReceivableTypeOfBorrower, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:GeographicDistribution
us-gaap:ClassOfFinancingReceivableTypeOfBorrower, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:GeographicDistribution, us-gaap:InternalCreditAssessment
us-gaap:ClassOfFinancingReceivableTypeOfBorrower, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:InternalCreditAssessment
us-gaap:ClassOfFinancingReceivableTypeOfBorrower, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:GeographicDistribution
us-gaap:ClassOfFinancingReceivableTypeOfBorrower, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:GeographicDistribution, us-gaap:InternalCreditAssessment
us-gaap:FinancingReceivablePortfolioSegment
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:InternalCreditAssessment

us-gaap:FinancingReceivableRecordedInvestmentCurrent
us-gaap:ClassOfFinancingReceivableTypeOfBorrower, us-gaap:EquitySecuritiesByIndustry, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:GeographicDistribution
us-gaap:ClassOfFinancingReceivableTypeOfBorrower, us-gaap:FinancingReceivablePortfolioSegment
us-gaap:ClassOfFinancingReceivableTypeOfBorrower, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
us-gaap:ClassOfFinancingReceivableTypeOfBorrower, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:GeographicDistribution
us-gaap:ClassOfFinancingReceivableTypeOfBorrower, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:GeographicDistribution
us-gaap:FinancingReceivablePortfolioSegment
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable

us-gaap:FinancingReceivableRecordedInvestmentNonaccrualStatus
us-gaap:ClassOfFinancingReceivableTypeOfBorrower, us-gaap:EquitySecuritiesByIndustry, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:GeographicDistribution
us-gaap:ClassOfFinancingReceivableTypeOfBorrower, us-gaap:FinancingReceivablePortfolioSegment
us-gaap:ClassOfFinancingReceivableTypeOfBorrower, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:GeographicDistribution
us-gaap:ClassOfFinancingReceivableTypeOfBorrower, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:GeographicDistribution
us-gaap:ClassOfFinancingReceivableTypeOfBorrower, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:GeographicDistribution, cma:LoanClassification

us-gaap:FinancingReceivableRecordedInvestmentPastDue

us-gaap:FinancingReceivableRevolving
us-gaap:ClassOfFinancingReceivableTypeOfBorrower, us-gaap:FinancingReceivablePortfolioSegment
us-gaap:ClassOfFinancingReceivableTypeOfBorrower, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
us-gaap:ClassOfFinancingReceivableTypeOfBorrower, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:GeographicDistribution
us-gaap:ClassOfFinancingReceivableTypeOfBorrower, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:GeographicDistribution, us-gaap:InternalCreditAssessment
us-gaap:ClassOfFinancingReceivableTypeOfBorrower, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:InternalCreditAssessment
us-gaap:ClassOfFinancingReceivableTypeOfBorrower, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:GeographicDistribution
us-gaap:ClassOfFinancingReceivableTypeOfBorrower, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:GeographicDistribution, us-gaap:InternalCreditAssessment
us-gaap:FinancingReceivablePortfolioSegment
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:InternalCreditAssessment

us-gaap:ForeclosedAssets

us-gaap:InterestBearingDepositLiabilities

us-gaap:InterestBearingDepositsInBanks
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByMeasurementBasis

us-gaap:InterestBearingForeignDepositTimeDeposits
us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType
us-gaap:InterestReceivable

us-gaap:LettersOfCreditOutstandingAmount
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:LiabilitiesFairValueDisclosure
us-gaap:FairValueByMeasurementFrequency

us-gaap:LoansAndLeasesReceivableAllowance

us-gaap:LoansAndLeasesReceivableImpairedCommitmentToLend

us-gaap:LoansAndLeasesReceivableImpairedNonperformingNonaccrualOfInterest
us-gaap:ClassOfFinancingReceivableTypeOfBorrower, us-gaap:EquitySecuritiesByIndustry, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:GeographicDistribution
us-gaap:ClassOfFinancingReceivableTypeOfBorrower, us-gaap:FinancingReceivablePortfolioSegment
us-gaap:ClassOfFinancingReceivableTypeOfBorrower, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
us-gaap:ClassOfFinancingReceivableTypeOfBorrower, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:GeographicDistribution
us-gaap:ClassOfFinancingReceivableTypeOfBorrower, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:GeographicDistribution
us-gaap:ClassOfFinancingReceivableTypeOfBorrower, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:GeographicDistribution, cma:LoanClassification
us-gaap:FinancingReceivablePortfolioSegment
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable

us-gaap:LoansAndLeasesReceivableNetOfDeferredIncome

us-gaap:LoansAndLeasesReceivableNetReportedAmount
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByMeasurementFrequency
us-gaap:ClassOfFinancingReceivableTypeOfBorrower, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:GeographicDistribution
us-gaap:LoansReceivableFairValueDisclosure
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis
us-gaap:LoansReceivableHeldForSaleNetNotPartOfDisposalGroup
us-gaap:FairValueByMeasurementBasis
us-gaap:ConsolidatedEntities, us-gaap:DebtInstrument
us-gaap:LongtermDebtWeightedAverageInterestRate
us-gaap:Range, cma:CreditRelatedFinancialInstruments
us-gaap:LossContingencyEstimateOfPossibleLoss
us-gaap:Range, us-gaap:FinancialInstrument
us-gaap:Range, us-gaap:FinancialInstrument, cma:CreditRelatedFinancialInstruments
us-gaap:Range, us-gaap:LitigationStatus

us-gaap:MortgageLoansInProcessOfForeclosureAmount

us-gaap:NoninterestBearingDepositLiabilities
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByMeasurementBasis

us-gaap:OtherAssets

us-gaap:OtherLiabilities
us-gaap:ConsolidatedEntities
us-gaap:OtherLongTermDebt
us-gaap:ConsolidatedEntities, us-gaap:DebtInstrument

us-gaap:OtherShortTermInvestments

us-gaap:ShortTermBorrowings
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByMeasurementBasis

us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
us-gaap:StatementEquityComponents
us-gaap:ConsolidatedEntities
us-gaap:SubordinatedDebt
us-gaap:ConsolidatedEntities, us-gaap:DebtInstrument
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument
us-gaap:TradingSecurities
us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument

us-gaap:TreasuryStockShares

us-gaap:UnamortizedDebtIssuanceExpense

us-gaap:UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued
us-gaap:VariableInterestEntitiesByClassificationOfEntity
us-gaap:VariableInterestEntityEntityMaximumLossExposureAmount

Tables

  2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-06-302017-03-31
us-gaap:CommonStockValue ▄▄▄▄▄▄▄▄▄▄1141114111411141114111411141114111411141
us-gaap:CommonStockSharesIssued ▄▄▄▄▄▄▄▄▄▄228228228228228228228228228228
 us-gaap:CommonStockSharesOutstanding us-gaap:StatementEquityComponents us-gaap:CommonStock▁▂▂▃▄▆▇▇██139142144149155165170172175177
us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding 141NA148153160170174175179180
us-gaap:WeightedAverageNumberOfSharesOutstandingBasic 141NA147152158167171172175175
us-gaap:EarningsPerShareBasic ▁▇█▇█▇▇▇▅▅-0.461.871.981.952.141.891.91.621.151.15
us-gaap:EarningsPerShareDiluted ▁▇███▇▇▇▅▅-0.461.851.961.942.111.861.871.591.131.11
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-06-302017-03-31
us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax ▁▂▂▂▁▂▂▂█▇185186190189184190187188212209
 us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ProductOrService us-gaap:CreditAndDebitCard▁▄█▆▄▃▂▁5962676563616059NANA
 us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ProductOrService us-gaap:DepositAccount▁▂▄▄▄▇▇█4950515151535354NANA
 us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ProductOrService us-gaap:FiduciaryAndTrust█▅▇▅▁▄▅▅5452535249515252NANA
 us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ProductOrService,us-gaap:StatementBusinessSegments us-gaap:CreditAndDebitCard,cma:BusinessBank▁▃█▇▆▂▂▁4951555453505049NANA
 us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ProductOrService,us-gaap:StatementBusinessSegments us-gaap:DepositAccount,cma:BusinessBank▁▁▁▃▃▆▃█3232323333343335NANA
 us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ProductOrService,us-gaap:StatementBusinessSegments us-gaap:FiduciaryAndTrust,cma:WealthManagement█▅▇▅▁▄▅▅5452535249515252NANA
 us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:StatementBusinessSegments cma:BusinessBank▃▄▄▄▄▄▁▁██8991939392928384103103
 us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:StatementBusinessSegments cma:RetailBank▁▁▂▂▁▃▅▅██28293031293438394645
 us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:StatementBusinessSegments cma:WealthManagement█▆▇▅▃▄▆▅▃▁68666765636466656361
us-gaap:InterestExpense ▆▇██▇▅▃▂▁▁961151251241047660412926
us-gaap:InterestExpenseLongTermDebt ▆▇███▆▄▃▂▁40455051514032252017
us-gaap:IncomeTaxExpenseBenefit ▁▇▇▇▇▆█▅█▆-21828087856393549966
 us-gaap:IncomeTaxExpenseBenefit us-gaap:StatementBusinessSegments cma:Other1██▇▇▄▂█▁▅▁11-30-12-202-22-7-21
 us-gaap:IncomeTaxExpenseBenefit us-gaap:StatementBusinessSegments cma:OtherMarkets▁▆█▆▇▅▅▅▇▆4172216191515152016
 us-gaap:IncomeTaxExpenseBenefit us-gaap:StatementBusinessSegments cma:RetailBank▁▃▄▆▇▄█▅▇▅03578510696
 us-gaap:IncomeTaxExpenseBenefit us-gaap:StatementBusinessSegments cma:WealthManagement▁▄▆▇▅▄▂▄█▇6912131197101413
 us-gaap:IncomeTaxExpenseBenefit us-gaap:StatementBusinessSegments stpr:CA▁█▇▇▇▆▅▅▇▆17423739373432304036
 us-gaap:IncomeTaxExpenseBenefit us-gaap:StatementBusinessSegments stpr:MI▁▄▅▆▄▄▃▁██15252730262522163837
us-gaap:IncomeTaxesPaidNet ▁▃▄█▁3456014912NA922131-1
us-gaap:ProfitLoss ▁▇▇▇███▇▆▆-65269292298339318326281203202
 us-gaap:ProfitLoss us-gaap:StatementBusinessSegments cma:Other1▂▁▃▃▅▇▃▇▃█-2-6231122320526
 us-gaap:ProfitLoss us-gaap:StatementBusinessSegments cma:OtherMarkets▁▆█▅▇▅▅▆▃▃30738764766466684946
 us-gaap:ProfitLoss us-gaap:StatementBusinessSegments cma:RetailBank▁▃▆▆▇▅█▅▄▃1112124281732201611
 us-gaap:ProfitLoss us-gaap:StatementBusinessSegments cma:WealthManagement▁▄██▆▄▂▅▂▂21293839332924312323
 us-gaap:ProfitLoss us-gaap:StatementBusinessSegments stpr:CA▁█▇▇▇▆▆▄▂▂5212211111411010197856159
 us-gaap:ProfitLoss us-gaap:StatementBusinessSegments stpr:MI▂▅▇█▆▆▄▁▃▃568394104878873496768
us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest ▆▆▅██▄▄▁▂▂344370338429435296290178221206
us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic ▁▇▇▇███▇▆▆-65267290297337316324279202200
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-06-302017-03-31
us-gaap:Assets █▄▄▃▁▂▃▃▂▄76337734027284872537706907144871987723357144772976
us-gaap:Liabilities █▄▄▃▁▁▂▂▁▃68935660756564865214632816366263908643356346265046
us-gaap:LiabilitiesAndStockholdersEquity █▄▄▃▁▂▃▃▂▄76337734027284872537706907144871987723357144772976
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-06-302017-03-31
us-gaap:CashAndCashEquivalentsAtCarryingValue ▃▄▂▁▁▄▄▆▄█4855581841173581348158395660683656318319
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-06-302017-03-31
us-gaap:PropertyPlantAndEquipmentNet ▁▂▄▄▅▅▄▄▇█454457467470474472467468484488
us-gaap:DeferredTaxAssetsLiabilitiesNet ▁▂▄▄▅▆▆▆██134292104145153169165224230
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-06-302017-03-31
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-06-302017-03-31
us-gaap:LongTermDebt █▇█▅▆▅▂▂▁▁7434726973116558684864185583559451435153
 us-gaap:LongTermDebt us-gaap:ConsolidatedEntities srt:ParentCompany█▆▇▃█▁184117351764152318321432NANANANA
 us-gaap:LongTermDebt us-gaap:ConsolidatedEntities srt:Subsidiaries█▇▇▂▁▁559355345547503550164986NANANANA
 us-gaap:LongTermDebt us-gaap:FairValueByFairValueHierarchyLevel,us-gaap:FairValueByMeasurementBasis us-gaap:FairValueInputsLevel2,us-gaap:EstimateOfFairValueFairValueDisclosure███▆▇▅▂▂▁▁7224731673166568686264315588560451385149
 us-gaap:LongTermDebt us-gaap:FairValueByMeasurementBasis us-gaap:CarryingReportedAmountFairValueDisclosure█▇█▅▆▅▂▂▁▁7434726973116558684864185583559451435153
 us-gaap:LongTermDebt us-gaap:FairValueByMeasurementBasis us-gaap:EstimateOfFairValueFairValueDisclosure███▆▇▅▂▂▁▁7224731673166568686264315588560451385149
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-06-302017-03-31
us-gaap:CommonStockValue ▄▄▄▄▄▄▄▄▄▄1141114111411141114111411141114111411141
us-gaap:RetainedEarningsAccumulatedDeficit ██▇▇▆▅▄▃▁▁9389953893699176897985878374811075807431
us-gaap:TreasuryStockValue ██▇▆▅▃▂▂▁▁5470529151464780435734752991283224852369
us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax █▄▃▃▂▁▁▂▃▃174-235-336-382-513-611-589-553-361-379
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-06-302017-03-31
us-gaap:NetCashProvidedByUsedInOperatingActivities █▃▅▅▁69922144438540NA256358249407
us-gaap:NetCashProvidedByUsedInInvestingActivities ▁█▇▄▆-35341096231-1582-239NA-569-147-1172773
us-gaap:NetCashProvidedByUsedInFinancingActivities █▄▃▇▁1872384-1391297-881NA-863780-1765-79
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-06-302017-03-31
us-gaap:NetCashProvidedByUsedInOperatingActivities █▃▅▅▁69922144438540NA256358249407
us-gaap:ProfitLoss ▁▇▇▇███▇▆▆-65269292298339318326281203202
 us-gaap:ProfitLoss us-gaap:StatementBusinessSegments cma:Other1▂▁▃▃▅▇▃▇▃█-2-6231122320526
 us-gaap:ProfitLoss us-gaap:StatementBusinessSegments cma:OtherMarkets▁▆█▅▇▅▅▆▃▃30738764766466684946
 us-gaap:ProfitLoss us-gaap:StatementBusinessSegments cma:RetailBank▁▃▆▆▇▅█▅▄▃1112124281732201611
 us-gaap:ProfitLoss us-gaap:StatementBusinessSegments cma:WealthManagement▁▄██▆▄▂▅▂▂21293839332924312323
 us-gaap:ProfitLoss us-gaap:StatementBusinessSegments stpr:CA▁█▇▇▇▆▆▄▂▂5212211111411010197856159
 us-gaap:ProfitLoss us-gaap:StatementBusinessSegments stpr:MI▂▅▇█▆▆▄▁▃▃568394104878873496768
us-gaap:IncreaseDecreaseInOtherOperatingCapitalNet ▁▆▅▄█-399118-25-64289NA40-55-43-137
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-06-302017-03-31
us-gaap:NetCashProvidedByUsedInInvestingActivities ▁█▇▄▆-35341096231-1582-239NA-569-147-1172773
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-06-302017-03-31
us-gaap:NetCashProvidedByUsedInFinancingActivities █▄▃▇▁1872384-1391297-881NA-863780-1765-79
us-gaap:ProceedsFromIssuanceOfLongTermDebt ▁▁█▁▄007000350NA0100000
us-gaap:PaymentsForRepurchaseOfCommonStock ▂▁▆██199152370429443NA169168132125
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-06-302017-03-31

Common Stock Value

us-gaap:CommonStockValue



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-31
Value11411141114111411141114111411141114111411141114111411141114111411141114111411141114111411141114111411141114111411141114111411141114111411141101910191019101910191019894
Percentage of CommonStockValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.51.61.61.61.61.61.61.61.61.61.61.61.61.61.51.61.71.61.61.61.61.61.71.71.71.71.81.81.81.71.81.81.81.91.91.91.91.91.91.81.81.5

Common Stock Par Or Stated Value Per Share

Common Stock Shares Issued

us-gaap:CommonStockSharesIssued



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-31
Value228228228228228228228228228228228228228228228228228228228228228228228228228228228228228228228228228228228203203203203203203178
Percentage of CommonStockSharesIssued100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Common Stock Shares Outstanding

us-gaap:StatementEquityComponents

us-gaap:CommonStockSharesOutstanding

us-gaap:CommonStock



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-312007-12-31
Value139142144149155160165170172172174175177175172173175175177178178179180180181182183185186188191194197197198176176176176176176151150150
Percentage of CommonStockSharesOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Common Stock Shares Authorized

Weighted Average Number Of Diluted Shares Outstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-31
Value141148153160170174175177179180176177176181182182185186187187187187191194196
Percentage of WeightedAverageNumberOfDilutedSharesOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Weighted Average Number Of Shares Outstanding Basic

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-31
Value141147152158167171172174175175171173173176176176179179180182183185190194195
Percentage of WeightedAverageNumberOfSharesOutstandingBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Earnings Per Share Basic

us-gaap:EarningsPerShareBasic



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value-0.461.871.981.952.141.911.891.91.620.651.291.151.150.950.870.60.340.650.760.760.750.830.850.830.760.640.80.770.710.680.610.730.660.480.510.540.580.540.340.4-0.46-0.42-0.1-0.11-0.16
Percentage of EarningsPerShareBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Earnings Per Share Diluted

us-gaap:EarningsPerShareDiluted



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value-0.461.851.961.942.111.881.861.871.590.631.261.131.110.920.840.580.340.640.740.730.730.80.820.80.730.620.780.760.70.680.610.730.660.480.510.530.570.530.330.39-0.46-0.42-0.1-0.11-0.16
Percentage of EarningsPerShareDiluted100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Income Loss From Continuing Operations Per Basic Share

Income Loss From Continuing Operations Per Diluted Share

Revenue From Contract With Customer Excluding Assessed Tax

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-06-302017-03-31
Value185186190189184190187188212209
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProductOrService

cma:BrokerageCommissionsRevenue



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value777777767
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax3.83.83.73.73.80.03.73.23.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax3.83.83.73.73.80.03.73.23.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cma:BrokerageCommissionsRevenue100.0100.0100.0100.0100.0100.0100.0100.0100.0

cma:NoninterestDomain



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value12107101015131013
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax6.55.43.75.35.40.06.85.36.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax6.55.43.75.35.40.06.85.36.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cma:NoninterestDomain100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CommercialLoan



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value455444554
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.22.72.62.12.20.02.62.72.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.22.72.62.12.20.02.62.72.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:CommercialLoan100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CreditAndDebitCard



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value596267656364616059
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax31.933.335.334.434.20.032.132.131.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax31.933.335.334.434.20.032.132.131.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:CreditAndDebitCard100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DepositAccount



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value495051515151535354
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax26.526.926.827.027.70.027.928.328.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax26.526.926.827.027.70.027.928.328.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:DepositAccount100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FiduciaryAndTrust



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value545253524951515252
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax29.228.027.927.526.60.026.827.827.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax29.228.027.927.526.60.026.827.827.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:FiduciaryAndTrust100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProductOrService, us-gaap:StatementBusinessSegments

cma:BrokerageCommissionsRevenue, cma:WealthManagement



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value777777767
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax3.83.83.73.73.80.03.73.23.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax3.83.83.73.73.80.03.73.23.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cma:BrokerageCommissionsRevenue cma:WealthManagement100.0100.0100.0100.0100.0100.0100.0100.0100.0

cma:NoninterestDomain, cma:BusinessBank



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value431223324
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.21.60.51.11.10.01.61.12.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.21.60.51.11.10.01.61.12.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cma:NoninterestDomain cma:BusinessBank100.0100.0100.0100.0100.0100.0100.0100.0100.0

cma:NoninterestDomain, cma:FinanceOther1MemberDomain



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value0.00.00.00.00.01000000.00.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cma:NoninterestDomain cma:FinanceOther1MemberDomain0.00.00.00.00.0100.00.00.00.0

cma:NoninterestDomain, cma:RetailBank



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value331436635
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.61.60.52.11.60.03.21.62.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.61.60.52.11.60.03.21.62.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cma:NoninterestDomain cma:RetailBank100.0100.0100.0100.0100.0100.0100.0100.0100.0

cma:NoninterestDomain, cma:WealthManagement



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value545455454
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.72.22.62.12.70.02.12.72.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.72.22.62.12.70.02.12.72.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cma:NoninterestDomain cma:WealthManagement100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CommercialLoan, cma:BusinessBank



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value455444554
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.22.72.62.12.20.02.62.72.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.22.72.62.12.20.02.62.72.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:CommercialLoan cma:BusinessBank100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CreditAndDebitCard, cma:BusinessBank



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value495155545352505049
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax26.527.428.928.628.80.026.326.726.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax26.527.428.928.628.80.026.326.726.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:CreditAndDebitCard cma:BusinessBank100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CreditAndDebitCard, cma:RetailBank



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value91011109111099
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax4.95.45.85.34.90.05.34.84.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax4.95.45.85.34.90.05.34.84.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:CreditAndDebitCard cma:RetailBank100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DepositAccount, cma:BusinessBank



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value323232333332343335
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax17.317.216.817.517.90.017.917.618.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax17.317.216.817.517.90.017.917.618.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:DepositAccount cma:BusinessBank100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DepositAccount, cma:RetailBank



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value161618171718181818
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax8.68.69.59.09.20.09.59.69.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax8.68.69.59.09.20.09.59.69.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:DepositAccount cma:RetailBank100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DepositAccount, cma:WealthManagement



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value121111121
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.51.10.50.50.50.00.51.10.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.51.10.50.50.50.00.51.10.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:DepositAccount cma:WealthManagement100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FiduciaryAndTrust, cma:WealthManagement



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value545253524951515252
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax29.228.027.927.526.60.026.827.827.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax29.228.027.927.526.60.026.827.827.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:FiduciaryAndTrust cma:WealthManagement100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementBusinessSegments

cma:BusinessBank



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-06-302017-03-31
Value8991939392928384103103
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax48.148.948.949.250.048.444.444.748.649.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax48.148.948.949.250.048.444.444.748.649.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cma:BusinessBank100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cma:FinanceOther1MemberDomain



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value0.00.00.00.00.01000000.00.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cma:FinanceOther1MemberDomain0.00.00.00.00.0100.00.00.00.0

cma:RetailBank



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-06-302017-03-31
Value28293031293438394645
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax15.115.615.816.415.817.920.320.721.721.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax15.115.615.816.415.817.920.320.721.721.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cma:RetailBank100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cma:WealthManagement



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-06-302017-03-31
Value68666765636466656361
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax36.835.535.334.434.233.735.334.629.729.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax36.835.535.334.434.233.735.334.629.729.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cma:WealthManagement100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Revenues

Costs And Expenses

Interest Expense

us-gaap:InterestExpense



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value9611512512410490766041333329262930282524262322232225252627293032333535374040394052546183126150179
Percentage of InterestExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax51.961.865.865.656.50.040.032.121.80.00.013.712.40.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Interest Expense Long Term Debt

us-gaap:InterestExpenseLongTermDebt



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value404550515140322520192017192018151415121112111414141415161716161717252526
Percentage of InterestExpenseLongTermDebt100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax21.624.226.327.027.721.117.113.30.00.09.48.10.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest

Income Tax Expense Benefit

us-gaap:IncomeTaxExpenseBenefit



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value-218280878590639354218108996662644225416364617073706435545050553650483328413530723-5-42-29-59-1
Percentage of IncomeTaxExpenseBenefit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-11.444.142.146.046.20.033.249.728.70.00.046.731.60.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:StatementBusinessSegments

cma:BusinessBank



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-30
Value-207974718277685998991009279977544829994
Percentage of IncomeTaxExpenseBenefit95.296.392.581.696.5122.273.1109.345.091.7101.0139.4127.4151.6178.6176.0200.0157.1146.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-10.842.538.937.644.640.536.431.40.00.047.244.00.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cma:BusinessBank-22.586.879.676.389.183.781.970.20.00.097.189.30.00.00.00.00.00.00.0

cma:Finance



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-30
Value-8-10-8-4-4-861-7-10-17-24-25-39-38-38-45-57-53
Percentage of IncomeTaxExpenseBenefit38.1-12.2-10.0-4.6-4.7-12.76.51.9-3.2-9.3-17.2-36.4-40.3-60.9-90.5-152.0-109.8-90.5-82.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-4.3-5.4-4.2-2.1-2.2-4.23.20.50.00.0-8.0-11.50.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cma:Finance0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

cma:FinanceOther



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-30
Value-7-10-11-4-16-278-2192-11-24-45-23-43-39-36-46-54-54
Percentage of IncomeTaxExpenseBenefit33.3-12.2-13.8-4.6-18.8-42.98.6-38.942.2-10.2-24.2-68.2-37.1-67.2-92.9-144.0-112.2-85.7-84.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-3.8-5.4-5.8-2.1-8.7-14.24.3-11.20.00.0-11.3-21.50.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cma:FinanceOther0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

cma:Other1



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-30
Value11-30-12-202-2299-1-7-212-4-12-13-1
Percentage of IncomeTaxExpenseBenefit-4.81.2-3.80.0-14.1-31.72.2-40.745.4-0.9-7.1-31.83.2-6.2-2.48.0-2.44.8-1.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.50.5-1.60.0-6.5-10.51.1-11.70.00.0-3.3-10.00.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cma:Other10.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

cma:OtherMarkets



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-30
Value417221619151515211720161718212482516
Percentage of IncomeTaxExpenseBenefit-19.020.727.518.422.423.816.127.89.615.720.224.227.428.150.096.019.539.725.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.29.111.68.510.37.98.08.00.00.09.47.70.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cma:OtherMarkets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

cma:RetailBank



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-30
Value035785106141096-30-15-4710
Percentage of IncomeTaxExpenseBenefit-0.03.76.28.09.47.910.811.16.49.39.19.1-4.80.0-2.420.0-9.811.115.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.01.62.63.74.32.65.33.20.00.04.22.90.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cma:RetailBank0.010.316.722.627.614.726.315.40.00.019.613.30.00.00.00.00.00.00.0

cma:WealthManagement



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-30
Value6912131197101410141391071291114
Percentage of IncomeTaxExpenseBenefit-28.611.015.014.912.914.37.518.56.49.314.119.714.515.616.748.022.017.521.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax3.24.86.36.96.04.73.75.30.00.06.66.20.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cma:WealthManagement8.813.617.920.017.514.110.615.40.00.022.221.30.00.00.00.00.00.00.0

stpr:CA



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-30
Value17423739373432303737403634443043423742
Percentage of IncomeTaxExpenseBenefit-81.051.246.244.843.554.034.455.617.034.340.454.554.868.871.4172.0102.458.765.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax9.222.619.520.620.117.917.116.00.00.018.917.20.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax stpr:CA0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

stpr:MI



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-30
Value15252730262522163734383726262835313550
Percentage of IncomeTaxExpenseBenefit-71.430.533.834.530.639.723.729.617.031.538.456.141.940.666.7140.075.655.678.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax8.113.414.215.914.113.211.88.50.00.017.917.70.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax stpr:MI0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

stpr:TX



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-30
Value-5085619161614313125228192-4162010
Percentage of IncomeTaxExpenseBenefit238.19.86.26.922.425.417.225.914.228.725.333.312.929.74.8-164.014.631.715.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-27.04.32.63.210.38.48.67.40.00.011.810.50.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax stpr:TX0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:VariableInterestEntitiesByClassificationOfEntity

us-gaap:VariableInterestEntityNotPrimaryBeneficiary



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-31
Value-3-2-3-2-3-3-3-3-4-5-6-5-5-6-5-6-6-5-5-5-8-6-7-6-15-14-14-14-13-14
Percentage of IncomeTaxExpenseBenefit14.3-2.4-3.8-2.3-3.5-4.8-3.2-5.6-1.8-4.6-6.1-7.6-8.1-9.4-11.9-24.0-14.6-7.9-7.8-8.2-11.4-8.2-10.0-9.4-27.8-28.0-28.0-38.9-26.0-29.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-1.6-1.1-1.6-1.1-1.6-1.6-1.6-1.60.00.0-2.8-2.40.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:VariableInterestEntityNotPrimaryBeneficiary0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Income Taxes Paid Net

us-gaap:IncomeTaxesPaidNet



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-312010-03-31
Value345601491292289117131-14051132425792-10364441100151469
Percentage of IncomeTaxesPaidNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.624.231.678.86.549.21.10.00.061.8-0.50.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Profit Loss

us-gaap:ProfitLoss



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value-652692922983393103183262811122262032021641491046011613613513414915415113911714714313413011714413096989610396597052-2919189
Percentage of ProfitLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-35.1144.6153.7157.7184.20.0167.4174.3149.50.00.095.896.70.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:StatementBusinessSegments

cma:BusinessBank



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-312010-03-31
Value-632612482382742642341981761901801771961921549520019418218921421119719819820616789
Percentage of ProfitLoss96.997.084.979.980.883.071.870.5157.184.188.787.6119.5128.9148.1158.3172.4142.6134.8141.0143.6137.0130.5142.4147.8158.5162.1171.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-34.1140.3130.5125.9148.9138.9125.1105.30.00.084.984.70.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cma:BusinessBank-70.8286.8266.7255.9297.8287.0281.9235.70.00.0174.8171.80.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

cma:Finance



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-312010-03-31
Value-22-26-17-6-7-143312-3-6-21-35-53-61-62-68-102-93-90-89-100-73-91-92-98-92-76-59
Percentage of ProfitLoss33.8-9.7-5.8-2.0-2.1-4.410.14.3-2.7-2.7-10.3-17.3-32.3-40.9-59.6-113.3-87.9-68.4-66.7-66.4-67.1-47.4-60.3-66.2-73.1-70.8-73.8-113.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-11.9-14.0-8.9-3.2-3.8-7.417.66.40.00.0-9.9-16.70.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cma:Finance0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

cma:FinanceOther



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-31
Value-24-32-15-3483632-109-3-16-9-52-62-61-69-104-92-91-88-100-76-87-94-99-101-76
Percentage of ProfitLoss36.9-11.9-5.1-1.01.22.511.011.4-97.3-1.3-7.9-4.5-31.7-41.6-58.7-115.0-89.7-67.6-67.4-65.7-67.1-49.4-57.6-67.6-73.9-77.7-73.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-13.0-17.2-7.9-1.62.24.219.317.00.00.0-7.5-4.30.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cma:FinanceOther0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

cma:Other1



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-31
Value-2-6231122320-10635261-11-1-21-110-34-2-1-11
Percentage of ProfitLoss3.1-2.20.71.03.26.90.97.1-94.61.32.512.90.6-0.71.0-1.7-1.70.7-0.70.70.0-1.92.6-1.4-0.7-8.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-1.1-3.21.11.66.011.61.610.60.00.02.412.40.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cma:Other10.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

cma:OtherMarkets



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-312010-03-31
Value30738764766466685148494656525559515943444759595656383816
Percentage of ProfitLoss-46.227.129.821.522.420.120.224.245.521.224.122.834.134.952.998.344.043.431.932.831.538.339.140.341.829.236.930.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax16.239.245.833.941.333.735.336.20.00.023.122.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cma:OtherMarkets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

cma:RetailBank



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-312010-03-31
Value11121242817322021211611-31-212-21318171271691014-2-7
Percentage of ProfitLoss-1.54.17.28.18.35.39.87.118.89.37.95.4-1.80.7-1.920.0-1.79.613.312.78.14.510.66.57.510.8-1.9-13.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.55.911.112.715.28.917.110.60.00.07.55.30.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cma:RetailBank3.637.970.077.496.650.084.251.30.00.034.824.40.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

cma:WealthManagement



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-31
Value212938393329243124182323231813222221261623122526251114
Percentage of ProfitLoss-32.310.813.013.19.79.17.411.021.48.011.311.414.012.112.536.719.015.419.311.915.47.816.618.718.78.513.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax11.415.620.020.617.915.312.816.50.00.010.811.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cma:WealthManagement30.943.956.760.052.445.336.447.70.00.036.537.70.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

stpr:CA



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-31
Value521221111141101019785576161597275507490627173836363635664
Percentage of ProfitLoss-80.045.438.038.332.431.829.830.250.927.030.029.243.950.348.1123.377.645.652.654.555.740.941.745.341.849.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax28.165.658.460.359.853.251.945.20.00.028.828.20.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax stpr:CA0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

stpr:MI



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-31
Value56839410487887349646567686951577282719873816677687778
Percentage of ProfitLoss-86.230.932.234.925.727.722.417.457.128.833.033.742.134.254.8120.070.752.272.654.554.442.951.048.957.560.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax30.344.649.555.047.346.339.026.10.00.031.632.50.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax stpr:MI0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

stpr:TX



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-31
Value-179231519625754474955423819333-76-3361432384239464441
Percentage of ProfitLoss275.48.65.16.418.317.916.616.743.824.320.718.811.622.12.9-126.7-2.626.510.423.925.527.325.833.132.831.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-96.812.47.910.133.730.028.925.00.00.019.818.20.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax stpr:TX0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-312010-03-31
Value-652692922983393183262811122262032021641491046011613613513414915415113913413010352
Percentage of ProfitLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-35.1144.6153.7157.7184.2167.4174.3149.50.00.095.896.70.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest

us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-03-31
Value34437033842943531229629017810722822120673152137161311871091765414117220526714415137-30165169160-3017617011085
Percentage of ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax185.9198.9177.9227.0236.40.0155.8155.194.70.00.0104.298.60.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Net Income Loss Available To Common Stockholders Basic

us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value-6526729029733730831632427911222420220016314810359115134134132148152149137115145141132128116142129959795102955969-71-62-16-16-24
Percentage of NetIncomeLossAvailableToCommonStockholdersBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-35.1143.5152.6157.1183.20.0166.3173.3148.40.00.095.395.70.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Assets

us-gaap:Assets



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-31
Value763377340272848725377069070818714487198772335715677201771447729767297874124712806900771877710126994569336691906888765325656816522764670629476488565359633146265062593610086088854141550175366755004558855710659249
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Liabilities

us-gaap:Liabilities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-31
Value689356607565648652146328163311636626390864335636046398363462650466518266397635866136364317633906242261836617886145457956583985807457701560365789758417562305562255608541405393748103491404787449147500935143852220
Percentage of Liabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets90.390.090.189.989.589.489.188.888.988.988.888.889.189.389.689.288.989.589.389.289.289.389.288.788.989.089.289.089.289.488.888.888.888.788.688.889.389.289.489.690.188.1

Liabilities And Stockholders Equity

us-gaap:LiabilitiesAndStockholdersEquity



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-31
Value763377340272848725377069070818714487198772335715677201771447729767297874124712806900771877710126994569336691906888765325656816522764670629476488565359633146265062593610086088854141550175366755004558855710659249
Percentage of LiabilitiesAndStockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Cash And Cash Equivalents At Carrying Value

us-gaap:CashAndCashEquivalentsAtCarryingValue



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-312007-12-31
Value48555818411735813481456158395660683658456204563183197218804041103002614772005965596260717787389456206451708839255597453439384141396035565198346644452083399442254588561734231514
Percentage of CashAndCashEquivalentsAtCarryingValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets6.47.95.74.94.96.48.27.99.58.28.67.911.49.910.85.84.48.610.18.58.68.811.36.08.69.911.06.28.66.96.26.66.35.88.56.48.13.97.37.68.09.50.00.0

Short Term Investments

Land

Property Plant And Equipment Gross

Accumulated Depreciation Depletion And Amortization Property Plant And Equipment

Property Plant And Equipment Net

us-gaap:PropertyPlantAndEquipmentNet



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-31
Value454457467470474475472467468466467484488501528544541550541541531532524562583594604604618622625667670675685641637630639634637644
Percentage of PropertyPlantAndEquipmentNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.60.60.60.60.70.70.70.60.60.70.60.70.70.70.70.80.80.80.80.80.80.80.80.90.90.90.91.01.01.01.01.11.11.11.11.21.21.21.21.11.11.1

Goodwill

Finite Lived Intangible Assets Net

Deferred Tax Assets Liabilities Net

us-gaap:DeferredTaxAssetsLiabilitiesNet



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302012-12-312011-12-312010-12-312009-12-31
Value134292104145166153169165141252224230217187166173199132135126130200212224256329294254395383158
Percentage of DeferredTaxAssetsLiabilitiesNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.10.10.10.20.20.20.20.20.20.30.30.30.30.30.20.30.30.20.20.20.20.30.30.30.40.50.50.40.60.70.3

Long Term Debt

us-gaap:LongTermDebt



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-31
Value7434726973116558684864636418558355944622463751435153516058905921310930583100284126862679266926203534354335653601469947204740474249194944500952066116613872399041991511060
Percentage of LongTermDebt100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets9.79.910.09.09.79.19.07.87.76.56.47.27.17.17.98.34.54.34.44.13.93.93.94.05.45.45.55.77.27.27.57.67.98.18.29.611.111.413.216.217.418.7

us-gaap:ConsolidatedEntities

srt:ParentCompany



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value1841173517641523183214591432602
Percentage of LongTermDebt24.823.924.123.226.822.622.313.0
Percentage of Assets2.42.42.42.12.62.12.00.8
Percentage of Assets srt:ParentCompany0.018.60.00.00.015.80.06.9

srt:Subsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value55935534554750355016500449864020
Percentage of LongTermDebt75.276.175.976.873.277.477.787.0
Percentage of Assets7.37.57.66.97.17.17.05.6
Percentage of Assets srt:Subsidiaries0.00.00.00.00.00.00.00.0

us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis

us-gaap:FairValueInputsLevel2, us-gaap:EstimateOfFairValueFairValueDisclosure



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302013-12-31
Value7224731673166568686264366431558856044636464251385149513258575863302930323047283526772681269625933540
Percentage of LongTermDebt97.2100.6100.1100.2100.299.6100.2100.1100.2100.3100.199.999.999.599.499.097.499.198.399.899.7100.1101.099.099.9
Percentage of Assets9.510.010.09.19.79.19.07.87.76.56.47.27.17.07.98.24.44.24.34.13.93.93.94.05.4
Percentage of Assets us-gaap:FairValueInputsLevel2 us-gaap:EstimateOfFairValueFairValueDisclosure0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:FairValueByMeasurementBasis

us-gaap:CarryingReportedAmountFairValueDisclosure



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302012-12-31
Value7434726973116558684864636418558355944622463751435153516058905921310930583100284126862679266926203534354335654720
Percentage of LongTermDebt100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets9.79.910.09.09.79.19.07.87.76.56.47.27.17.17.98.34.54.34.44.13.93.93.94.05.45.45.57.2
Percentage of Assets us-gaap:CarryingReportedAmountFairValueDisclosure0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:EstimateOfFairValueFairValueDisclosure



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302012-12-31
Value7224731673166568686264366431558856044636464251385149513258575863302930323047283526772681269625933527354035484685
Percentage of LongTermDebt97.2100.6100.1100.2100.299.6100.2100.1100.2100.3100.199.999.999.599.499.097.499.198.399.899.7100.1101.099.099.899.999.599.3
Percentage of Assets9.510.010.09.19.79.19.07.87.76.56.47.27.17.07.98.24.44.24.34.13.93.93.94.05.45.45.57.2
Percentage of Assets us-gaap:EstimateOfFairValueFairValueDisclosure0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Common Stock Value

us-gaap:CommonStockValue



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-31
Value11411141114111411141114111411141114111411141114111411141114111411141114111411141114111411141114111411141114111411141114111411141114111411141101910191019101910191019894
Percentage of CommonStockValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.51.61.61.61.61.61.61.61.61.61.61.61.61.61.51.61.71.61.61.61.61.61.71.71.71.71.81.81.81.71.81.81.81.91.91.91.91.91.91.81.81.5

Retained Earnings Accumulated Deficit

us-gaap:RetainedEarningsAccumulatedDeficit



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-31
Value938995389369917689798781858783748110788777467580743173317262715770977084700769086841674466316520641463216239612760205931583157445630554654715395531752475171512450645161
Percentage of RetainedEarningsAccumulatedDeficit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets12.313.012.912.712.712.412.011.611.211.010.810.610.210.09.810.010.39.99.99.99.99.79.610.09.89.79.69.79.39.19.29.29.09.19.010.09.79.89.49.28.98.7

Treasury Stock Value

us-gaap:TreasuryStockValue



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-31
Value547052915146478043573954347529912832273626062485236924282558247424242409234622882300225922052163212920972041197919201879178817001614163315931540154115651568157815801581
Percentage of TreasuryStockValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets7.27.27.16.66.25.64.94.23.93.83.63.53.23.33.53.53.53.43.33.33.33.33.23.33.23.23.23.13.02.92.82.72.62.72.62.82.82.92.92.82.82.7

Accumulated Other Comprehensive Income Loss Net Of Tax

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-31
Value174-235-336-382-513-609-611-589-553-451-359-361-379-383-292-295-328-429-345-396-370-412-317-304-325-391-541-538-410-413-253-301-326-356-230-308-382-389-238-240-303-336-309
Percentage of AccumulatedOtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.2-0.3-0.5-0.5-0.7-0.9-0.9-0.8-0.8-0.6-0.5-0.5-0.5-0.5-0.4-0.4-0.5-0.6-0.5-0.6-0.5-0.6-0.5-0.5-0.5-0.6-0.8-0.9-0.6-0.6-0.4-0.5-0.5-0.6-0.4-0.6-0.7-0.7-0.4-0.4-0.5-0.60.0

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-312010-03-31
Value6992214443854025635824520224940796158-62451992695633874219132214276158150309
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax377.8118.8233.7203.721.7136.9190.40.00.0117.5194.70.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-312010-03-31
Value-35341096231-1582-239-569-14756205-1172773371073-1122-258-2232401-923-501-1416190-1389-1128940-30310861182
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-1910.3589.2121.6-837.0-129.9-304.3-78.20.00.0-552.8369.90.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-312010-03-31
Value1872384-1391297-881-863780-660166-1765-79-95526992236-313298056587054-3743484-46983-1535491126-2520
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1011.9206.5-73.2686.2-478.8-461.5414.90.00.0-832.5-37.80.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-312010-03-31
Value6992214443854025635824520224940796158-62451992695633874219132214276158150309
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax377.8118.8233.7203.721.7136.9190.40.00.0117.5194.70.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Profit Loss

us-gaap:ProfitLoss



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value-652692922983393103183262811122262032021641491046011613613513414915415113911714714313413011714413096989610396597052-2919189
Percentage of ProfitLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-35.1144.6153.7157.7184.20.0167.4174.3149.50.00.095.896.70.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:StatementBusinessSegments

cma:BusinessBank



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-312010-03-31
Value-632612482382742642341981761901801771961921549520019418218921421119719819820616789
Percentage of ProfitLoss96.997.084.979.980.883.071.870.5157.184.188.787.6119.5128.9148.1158.3172.4142.6134.8141.0143.6137.0130.5142.4147.8158.5162.1171.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-34.1140.3130.5125.9148.9138.9125.1105.30.00.084.984.70.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cma:BusinessBank-70.8286.8266.7255.9297.8287.0281.9235.70.00.0174.8171.80.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

cma:Finance



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-312010-03-31
Value-22-26-17-6-7-143312-3-6-21-35-53-61-62-68-102-93-90-89-100-73-91-92-98-92-76-59
Percentage of ProfitLoss33.8-9.7-5.8-2.0-2.1-4.410.14.3-2.7-2.7-10.3-17.3-32.3-40.9-59.6-113.3-87.9-68.4-66.7-66.4-67.1-47.4-60.3-66.2-73.1-70.8-73.8-113.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-11.9-14.0-8.9-3.2-3.8-7.417.66.40.00.0-9.9-16.70.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cma:Finance0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

cma:FinanceOther



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-31
Value-24-32-15-3483632-109-3-16-9-52-62-61-69-104-92-91-88-100-76-87-94-99-101-76
Percentage of ProfitLoss36.9-11.9-5.1-1.01.22.511.011.4-97.3-1.3-7.9-4.5-31.7-41.6-58.7-115.0-89.7-67.6-67.4-65.7-67.1-49.4-57.6-67.6-73.9-77.7-73.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-13.0-17.2-7.9-1.62.24.219.317.00.00.0-7.5-4.30.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cma:FinanceOther0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

cma:Other1



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-31
Value-2-6231122320-10635261-11-1-21-110-34-2-1-11
Percentage of ProfitLoss3.1-2.20.71.03.26.90.97.1-94.61.32.512.90.6-0.71.0-1.7-1.70.7-0.70.70.0-1.92.6-1.4-0.7-8.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-1.1-3.21.11.66.011.61.610.60.00.02.412.40.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cma:Other10.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

cma:OtherMarkets



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-312010-03-31
Value30738764766466685148494656525559515943444759595656383816
Percentage of ProfitLoss-46.227.129.821.522.420.120.224.245.521.224.122.834.134.952.998.344.043.431.932.831.538.339.140.341.829.236.930.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax16.239.245.833.941.333.735.336.20.00.023.122.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cma:OtherMarkets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

cma:RetailBank



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-312010-03-31
Value11121242817322021211611-31-212-21318171271691014-2-7
Percentage of ProfitLoss-1.54.17.28.18.35.39.87.118.89.37.95.4-1.80.7-1.920.0-1.79.613.312.78.14.510.66.57.510.8-1.9-13.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.55.911.112.715.28.917.110.60.00.07.55.30.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cma:RetailBank3.637.970.077.496.650.084.251.30.00.034.824.40.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

cma:WealthManagement



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-31
Value212938393329243124182323231813222221261623122526251114
Percentage of ProfitLoss-32.310.813.013.19.79.17.411.021.48.011.311.414.012.112.536.719.015.419.311.915.47.816.618.718.78.513.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax11.415.620.020.617.915.312.816.50.00.010.811.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cma:WealthManagement30.943.956.760.052.445.336.447.70.00.036.537.70.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

stpr:CA



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-31
Value521221111141101019785576161597275507490627173836363635664
Percentage of ProfitLoss-80.045.438.038.332.431.829.830.250.927.030.029.243.950.348.1123.377.645.652.654.555.740.941.745.341.849.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax28.165.658.460.359.853.251.945.20.00.028.828.20.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax stpr:CA0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

stpr:MI



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-31
Value56839410487887349646567686951577282719873816677687778
Percentage of ProfitLoss-86.230.932.234.925.727.722.417.457.128.833.033.742.134.254.8120.070.752.272.654.554.442.951.048.957.560.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax30.344.649.555.047.346.339.026.10.00.031.632.50.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax stpr:MI0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

stpr:TX



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-31
Value-179231519625754474955423819333-76-3361432384239464441
Percentage of ProfitLoss275.48.65.16.418.317.916.616.743.824.320.718.811.622.12.9-126.7-2.626.510.423.925.527.325.833.132.831.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-96.812.47.910.133.730.028.925.00.00.019.818.20.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax stpr:TX0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-312010-03-31
Value-652692922983393183262811122262032021641491046011613613513414915415113913413010352
Percentage of ProfitLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-35.1144.6153.7157.7184.2167.4174.3149.50.00.095.896.70.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Increase Decrease In Other Operating Capital Net

us-gaap:IncreaseDecreaseInOtherOperatingCapitalNet



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-312010-03-31
Value-399118-25-6428940-554875-43-13710357211-1642-80123-190282-1063-92-110-77-16-201
Percentage of IncreaseDecreaseInOtherOperatingCapitalNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-312010-03-31
Value-35341096231-1582-239-569-14756205-1172773371073-1122-258-2232401-923-501-1416190-1389-1128940-30310861182
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-1910.3589.2121.6-837.0-129.9-304.3-78.20.00.0-552.8369.90.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-312010-03-31
Value1872384-1391297-881-863780-660166-1765-79-95526992236-313298056587054-3743484-46983-1535491126-2520
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1011.9206.5-73.2686.2-478.8-461.5414.90.00.0-832.5-37.80.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Proceeds From Issuance Of Long Term Debt

us-gaap:ProceedsFromIssuanceOfLongTermDebt



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302015-12-312015-09-302014-12-312014-09-302013-12-312013-09-30
Value007000350010000000000519024700
Percentage of ProceedsFromIssuanceOfLongTermDebt0.00.0100.00.0100.00.0100.00.00.00.00.00.00.00.0100.00.0100.00.00.0

Repayments Of Long Term Debt

Payments For Repurchase Of Common Stock

us-gaap:PaymentsForRepurchaseOfCommonStock



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-312010-03-31
Value1991523704294431691681481471321259997654965604966605961807436212
Percentage of PaymentsForRepurchaseOfCommonStock100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Repayments Of Long Term Debt

Debt Instrument Interest Rate Stated Percentage

Effective Income Tax Rate Continuing Operations

Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number

Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price

Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period

Share Based Compensation

us-gaap:ShareBasedCompensation



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-312010-03-31
Value82582410241056184552095816798141013134
Percentage of ShareBasedCompensation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Deferred Tax Liabilities

Deferred Tax Assets Net

Unrecognized Tax Benefits

us-gaap:UnrecognizedTaxBenefits



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-312008-12-31
Value19171615151410101010111115151515152222221614141111111313424227172120292791075070
Percentage of UnrecognizedTaxBenefits100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0

Deferred Tax Assets Valuation Allowance

us-gaap:DeferredTaxAssetsValuationAllowance



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-31
Value33333333333333333300000000
Percentage of DeferredTaxAssetsValuationAllowance100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.00.00.00.00.00.0

Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions

Operating Lease Right Of Use Asset

Cash And Cash Equivalents Period Increase Decrease

Proceeds From Repayments Of Short Term Debt

us-gaap:ProceedsFromRepaymentsOfShortTermDebt



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-312010-03-31
Value219220-16827988911038-499-3250016130-502491-8653-24-36-862616-93-5212-6927
Percentage of ProceedsFromRepaymentsOfShortTermDebt100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cma:CardFees



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value596267656361605991851211171515151513
Percentage of CardFees100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cma:CommercialLendingFees



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value172523212221231822212220212622203022222529262320282221222425222121222222
Percentage of CommercialLendingFees100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DerivativeInstrumentRisk

cma:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetRealizedGainLossIncludedInEarnings

us-gaap:InterestRateContract



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-30
Value0.00.01000000.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetRealizedGainLossIncludedInEarnings0.00.0100.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:DerivativeInstrumentRisk

cma:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetUnrealizedGainLossIncludedInEarnings

us-gaap:InterestRateContract



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-30
Value21-6775-4-1-70120-160711-29
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetUnrealizedGainLossIncludedInEarnings100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.00.0100.00.0100.0100.0100.0100.0

cma:Fiduciaryincome



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value54525352495152525048
Percentage of Fiduciaryincome100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cma:IncomeLossFromContinuingOperationsBeforeIncomeTaxes



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value-8635137238542438141933533033430226822621314685157199199195219227221203201193184153194178126137138669330
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxes100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cma:InterestAndDividendIncomeSecuritiesAFSAndHTM



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-30
Value7475757572666464646262626261626256545253515253
Percentage of InterestAndDividendIncomeSecuritiesAFSAndHTM100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, cma:DerivativePurpose

cma:Interestexpenseonhedgedmediumandlongtermdebt

us-gaap:InterestRateSwap, us-gaap:FairValueHedging, cma:RiskManagementDerivatives



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value3030282626232115
Percentage of Interestexpenseonhedgedmediumandlongtermdebt100.0100.0100.0100.0100.0100.0100.0100.0

cma:LetterOfCreditFees



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value99101099111011111112121213131413131314141514171616191817191818191918
Percentage of LetterOfCreditFees100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cma:NetIncreaseInFixedAssets



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312011-03-312010-03-31
Value152433131621202616151224172727412429253271516322823193017
Percentage of NetIncreaseInFixedAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cma:NumberOfGeographicMarkets



Period End2020-03-312019-12-312019-09-30
Value3.00.00.0
Percentage of NumberOfGeographicMarkets100.00.00.0

cma:NumberOfMajorBusinessSegments



Period End2020-03-312019-12-312019-09-30
Value3.00.00.0
Percentage of NumberOfMajorBusinessSegments100.00.00.0

cma:OtherComprehensiveIncomeLossReclassificationAdjustmentPensionAndOtherPostretirementBenefitPlansRecognizedInNetPeriodicDefinedBenefitCostBeforeTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302014-12-312014-09-302014-06-302014-03-312013-03-312012-03-31
Value9524488666610109101818111229-10-22-17
Percentage of OtherComprehensiveIncomeLossReclassificationAdjustmentPensionAndOtherPostretirementBenefitPlansRecognizedInNetPeriodicDefinedBenefitCostBeforeTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cma:OtherComprehensiveIncomeLossReclassificationAdjustmentPensionAndOtherPostretirementBenefitPlansRecognizedInNetPeriodicDefinedBenefitCostTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-31
Value21011221322417-3-467664510-4-8-6
Percentage of OtherComprehensiveIncomeLossReclassificationAdjustmentPensionAndOtherPostretirementBenefitPlansRecognizedInNetPeriodicDefinedBenefitCostTax100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cma:Othersourcesofnoninterestincome



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value528066615444615626246462
Percentage of Othersourcesofnoninterestincome100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementBusinessSegments

cma:BusinessBank



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value3852474344454337974941
Percentage of Othersourcesofnoninterestincome73.165.071.270.581.5102.370.566.134.629.276.666.1

cma:FinanceOther1MemberDomain



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value1217161374-4141354
Percentage of Othersourcesofnoninterestincome23.121.224.221.313.00.0-9.123.023.219.216.7

cma:RetailBank



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value081221438823
Percentage of Othersourcesofnoninterestincome0.010.01.53.33.72.36.65.430.833.33.14.8

cma:WealthManagement



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value232312134513
Percentage of Othersourcesofnoninterestincome3.83.83.04.91.94.51.65.415.420.81.64.8

cma:OutsideProcessingFeeExpense



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value577066656365646199928887898684798386857833313028313028272626252524232323
Percentage of OutsideProcessingFeeExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cma:Servicechargesondepositaccounts



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value49505151515353545557
Percentage of Servicechargesondepositaccounts100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cma:ShareawardsexcludedfromthecalculationofdilutedEPSbecauseinclusionwouldbeantidilutiveduetonetloss



Period End2020-03-312019-03-31
Value20
Percentage of ShareawardsexcludedfromthecalculationofdilutedEPSbecauseinclusionwouldbeantidilutiveduetonetloss100.00.0

cma:SoftwareExpenses



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value373030282932323131353129293130292626242323252522222222232123222023222222
Percentage of SoftwareExpenses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cma:Stockoptionsexcludedbecauseexercisepricesweregreaterthanaveragemarketpriceofshares



Period End2020-03-312019-03-31
Value10
Percentage of Stockoptionsexcludedbecauseexercisepricesweregreaterthanaveragemarketpriceofshares100.0100.0

us-gaap:RetirementPlanType

cma:Totalothercomponentsofnetbenefitcreditorcost

us-gaap:PensionPlansDefinedBenefit



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value16-12418-17-18-14-15-14-15-14-14-14
Percentage of Totalothercomponentsofnetbenefitcreditorcost100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:SupplementalEmployeeRetirementPlanDefinedBenefit



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value-2-222322222
Percentage of Totalothercomponentsofnetbenefitcreditorcost-12.5-11.1-11.8-11.1-21.4-13.3-14.3-14.3-14.3-14.3

us-gaap:AccretionAmortizationOfDiscountsAndPremiumsInvestments



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-312010-03-31
Value-10-1-10-1-1-1-2-1-2-1-3-2-2-2-3-4-4-4-4-3-2-10-10-7-4
Percentage of AccretionAmortizationOfDiscountsAndPremiumsInvestments100.00.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-312010-03-31
Value825824710241056184552095816798141013134
Percentage of AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-312010-03-31
Value825824710241056184552095816798141013134
Percentage of AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AdvertisingExpense



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value71010958869874656476667556666777777778
Percentage of AdvertisingExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:VariableInterestEntitiesByClassificationOfEntity, cma:TaxCreditsandBenefitsRelatedToTaxCreditEntities

us-gaap:AffordableHousingTaxCreditsAndOtherTaxBenefitsAmount

us-gaap:VariableInterestEntityNotPrimaryBeneficiary, cma:LowIncomeHousingTaxCredits



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value1616161515161615
Percentage of AffordableHousingTaxCreditsAndOtherTaxBenefitsAmount100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:VariableInterestEntityNotPrimaryBeneficiary, cma:OtherTaxBenefitsRelatedToTaxCreditEntities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value43343344
Percentage of AffordableHousingTaxCreditsAndOtherTaxBenefitsAmount25.018.818.826.720.018.825.026.7

us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType

us-gaap:AllowanceForLoanAndLeaseLossesWriteoffsNet

us-gaap:FinanceReceivables



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-30
Value842142331115-328162518333616425251231881391219172443
Percentage of AllowanceForLoanAndLeaseLossesWriteoffsNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType, us-gaap:FinancingReceivablePortfolioSegment

us-gaap:FinanceReceivables, us-gaap:CommercialPortfolioSegment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-30
Value822142331115-42817261733361641515721159-21
Percentage of AllowanceForLoanAndLeaseLossesWriteoffsNet97.6100.0100.0100.0100.0100.0133.3100.0106.2104.094.4100.0100.0100.097.698.1111.891.383.3112.5-200.033.3

us-gaap:FinanceReceivables, us-gaap:ConsumerPortfolioSegment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-30
Value20000010-1-1100011-623-132
Percentage of AllowanceForLoanAndLeaseLossesWriteoffsNet2.40.00.00.00.00.0-33.30.0-6.2-4.05.60.00.00.02.41.9-11.88.716.7-12.5300.066.7

us-gaap:VariableInterestEntitiesByClassificationOfEntity, cma:TaxCreditsandBenefitsRelatedToTaxCreditEntities

us-gaap:AmortizationMethodQualifiedAffordableHousingProjectInvestmentsAmortization

us-gaap:VariableInterestEntityNotPrimaryBeneficiary, cma:LowIncomeHousingTaxCredits



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value1717161715171716
Percentage of AmortizationMethodQualifiedAffordableHousingProjectInvestmentsAmortization100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FinancialInstrument

us-gaap:AvailableForSaleSecuritiesGrossRealizedGainLossNet

us-gaap:DebtSecurities



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-30
Value-100-8-20010
Percentage of AvailableForSaleSecuritiesGrossRealizedGainLossNet100.00.00.0100.0100.00.0100.00.0

us-gaap:FinancialInstrument

us-gaap:AvailableForSaleSecuritiesGrossRealizedGains

us-gaap:DebtSecurities



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-30
Value0.00.00.00.00.00.01000000.00.0
Percentage of AvailableForSaleSecuritiesGrossRealizedGains0.00.00.00.00.00.0100.00.0

us-gaap:FinancialInstrument

us-gaap:AvailableForSaleSecuritiesGrossRealizedLosses

us-gaap:DebtSecurities



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-30
Value100820000
Percentage of AvailableForSaleSecuritiesGrossRealizedLosses100.00.00.0100.0100.00.00.00.0

us-gaap:BankOwnedLifeInsuranceIncome



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value121011119119912129101212991110109811119121091010101098998
Percentage of BankOwnedLifeInsuranceIncome100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:BrokerageCommissionsRevenue



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value777777676665555445544445545556566666
Percentage of BrokerageCommissionsRevenue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect



Period End2020-03-312019-03-31
Value-963-1080
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect100.0100.0

us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, cma:DerivativePurpose

us-gaap:ChangeInUnrealizedGainLossOnFairValueHedgingInstruments1

us-gaap:InterestRateSwap, us-gaap:FairValueHedging, cma:RiskManagementDerivatives



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value-6-3-2010-1-2
Percentage of ChangeInUnrealizedGainLossOnFairValueHedgingInstruments1100.0100.0100.00.0100.00.0100.0100.0

us-gaap:CommonStockDividendsPerShareDeclared



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value0.680.67000000000000040.670.670.670.60.340.30.300000000000000040.30.260.230.229999999999999980.230.220.210.209999999999999960.210.210.20.200000000000000070.20.20.190.170.170.170.150.150.150.10.10.10.10.050.050.05
Percentage of CommonStockDividendsPerShareDeclared100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DebtAndEquitySecuritiesGainLoss



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value-1100-80-200100
Percentage of DebtAndEquitySecuritiesGainLoss100.0100.00.00.0100.00.0100.00.0100.00.00.0

us-gaap:DeferredIncomeTaxExpenseBenefit



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-312010-03-31
Value-73880-477127-29-18-123-22-13-39-19-27-4-2112320-8-5292213-126
Percentage of DeferredIncomeTaxExpenseBenefit100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RetirementPlanType, cma:DefinedBenefitsComponents

us-gaap:DefinedBenefitPlanAmortizationOfGainsLosses

us-gaap:PensionPlansDefinedBenefit, cma:Componentrecognizedinnoninterestexpense



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value148891312
Percentage of DefinedBenefitPlanAmortizationOfGainsLosses100.0100.0100.0100.0100.0100.0

us-gaap:SupplementalEmployeeRetirementPlanDefinedBenefit, cma:Componentrecognizedinnoninterestexpense



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value21-222-3
Percentage of DefinedBenefitPlanAmortizationOfGainsLosses14.312.5-25.022.215.4-25.0

us-gaap:RetirementPlanType, cma:DefinedBenefitsComponents

us-gaap:DefinedBenefitPlanAmortizationOfPriorServiceCostCredit

us-gaap:PensionPlansDefinedBenefit, cma:Componentrecognizedinnoninterestexpense



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value-5-5-4-5-5-4
Percentage of DefinedBenefitPlanAmortizationOfPriorServiceCostCredit100.0100.0100.0100.0100.0100.0

us-gaap:SupplementalEmployeeRetirementPlanDefinedBenefit, cma:Componentrecognizedinnoninterestexpense



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value-2-2-2-2-1-3
Percentage of DefinedBenefitPlanAmortizationOfPriorServiceCostCredit40.040.050.040.020.075.0

us-gaap:RetirementPlanType, cma:DefinedBenefitsComponents

us-gaap:DefinedBenefitPlanExpectedReturnOnPlanAssets

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit, cma:Componentrecognizedinnoninterestexpense



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value0.01000000.00.01000000.00.01000000.0
Percentage of DefinedBenefitPlanExpectedReturnOnPlanAssets0.0100.00.0100.00.0100.0

us-gaap:PensionPlansDefinedBenefit, cma:Componentrecognizedinnoninterestexpense



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value434141424141
Percentage of DefinedBenefitPlanExpectedReturnOnPlanAssets0.04100.00.04200.00.04100.0

us-gaap:RetirementPlanType, cma:DefinedBenefitsComponents

us-gaap:DefinedBenefitPlanInterestCost

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit, cma:Componentrecognizedinnoninterestexpense



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value0.00.00.01000000.00.00.0
Percentage of DefinedBenefitPlanInterestCost0.00.00.0100.00.00.0

us-gaap:PensionPlansDefinedBenefit, cma:Componentrecognizedinnoninterestexpense



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value182020201918
Percentage of DefinedBenefitPlanInterestCost0.00.00.02000.00.00.0

us-gaap:SupplementalEmployeeRetirementPlanDefinedBenefit, cma:Componentrecognizedinnoninterestexpense



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value232222
Percentage of DefinedBenefitPlanInterestCost0.00.00.0200.00.00.0

us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-31
Value-5-6-9-7-7-4-5-5-4-5-5-4-54431411121111101092119
Percentage of DefinedBenefitPlanNetPeriodicBenefitCost100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RetirementPlanType

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-30
Value0.01000000.0-1000000.00.00.00.01000000.00.00.00.00.00.00.00.0
Percentage of DefinedBenefitPlanNetPeriodicBenefitCost-0.0-16.711.1-0.0-0.0-0.0-20.0-0.0-0.0-0.0-0.0-0.0-0.00.0

us-gaap:PensionPlansDefinedBenefit



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-30
Value-8-10-10-10-10-7-7-7-7-7-7-7-80
Percentage of DefinedBenefitPlanNetPeriodicBenefitCost160.0166.7111.1142.9142.9175.0140.0140.0175.0140.0140.0175.0160.00.0

us-gaap:SupplementalEmployeeRetirementPlanDefinedBenefit



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-30
Value32333322234
Percentage of DefinedBenefitPlanNetPeriodicBenefitCost-60.0-22.2-42.9-42.9-75.0-60.0-40.0-40.0-40.0-75.0100.0

us-gaap:RetirementPlanType, cma:DefinedBenefitsComponents

us-gaap:DefinedBenefitPlanServiceCost

us-gaap:PensionPlansDefinedBenefit, cma:Salariesandbenefitsexpense



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value887878
Percentage of DefinedBenefitPlanServiceCost100.0100.0100.0100.0100.0100.0

us-gaap:SupplementalEmployeeRetirementPlanDefinedBenefit, cma:Salariesandbenefitsexpense



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value1000000.00.01000000.01000000.00.01000000.0
Percentage of DefinedBenefitPlanServiceCost12.50.014.312.50.012.5

us-gaap:DepreciationAndAmortization



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-312010-03-31
Value263027282929313031293130322930283030303131322930332932
Percentage of DepreciationAndAmortization100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cma:DerivativePurpose

us-gaap:DerivativeGainLossOnDerivativeNet

cma:CustomerInitiatedAndOtherActivitiesDerivatives



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-30
Value202416191821191618171917231716121514
Percentage of DerivativeGainLossOnDerivativeNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DerivativeInstrumentRisk, us-gaap:IncomeStatementLocation, cma:DerivativePurpose

us-gaap:EnergyRelatedDerivative, us-gaap:OtherIncome, cma:CustomerInitiatedAndOtherActivitiesDerivatives



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value112110
Percentage of DerivativeGainLossOnDerivativeNet5.06.210.55.64.80.0

us-gaap:ForeignExchangeContract, us-gaap:ForeignCurrencyGainLoss, cma:CustomerInitiatedAndOtherActivitiesDerivatives



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value1110111111121112
Percentage of DerivativeGainLossOnDerivativeNet55.041.768.857.961.10.052.463.2

us-gaap:InterestRateContract, us-gaap:OtherIncome, cma:CustomerInitiatedAndOtherActivitiesDerivatives



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value813466697
Percentage of DerivativeGainLossOnDerivativeNet40.054.225.031.633.30.042.936.8

us-gaap:DividendsCommonStockCash



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value949697100105100585252534642394038373837373636363635313232292920201818989
Percentage of DividendsCommonStockCash100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-312010-03-31
Value9496971001051005852525346423940383738373736363636353220189
Percentage of DividendsCommonStockCash100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EquipmentExpense



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value121313121212111111121111131314131314131314141514151515171617171715151517
Percentage of EquipmentExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DerivativeInstrumentRisk

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements

us-gaap:InterestRateContract



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-30
Value0-210000000000000
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements0.0100.0100.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:FederalDepositInsuranceCorporationPremiumExpense



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value8666511121313131213151414111099989889899101081215141617
Percentage of FederalDepositInsuranceCorporationPremiumExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType

us-gaap:FinancingReceivableAllowanceForCreditLossesRecovery

us-gaap:FinanceReceivables



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-31
Value56191191023913122111121912252511171519211918201814161917
Percentage of FinancingReceivableAllowanceForCreditLossesRecovery100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType, us-gaap:FinancingReceivablePortfolioSegment

us-gaap:FinanceReceivables, us-gaap:CommercialPortfolioSegment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-30
Value55171089228111020910181124171016121819
Percentage of FinancingReceivableAllowanceForCreditLossesRecovery100.083.389.590.988.990.095.788.984.683.395.281.883.394.791.796.068.090.994.180.094.790.5

us-gaap:FinanceReceivables, us-gaap:ConsumerPortfolioSegment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-30
Value0121111122122111811312
Percentage of FinancingReceivableAllowanceForCreditLossesRecovery0.016.710.59.111.110.04.311.115.416.74.818.216.75.38.34.032.09.15.920.05.39.5

us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType

us-gaap:FinancingReceivableAllowanceForCreditLossesWriteOffs

us-gaap:FinanceReceivables



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-31
Value892761442025203729373944483554777634352320242830393538596462
Percentage of FinancingReceivableAllowanceForCreditLossesWriteOffs100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType, us-gaap:FinancingReceivablePortfolioSegment

us-gaap:FinanceReceivables, us-gaap:CommercialPortfolioSegment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-30
Value87265943192418362836374246345275743131211620
Percentage of FinancingReceivableAllowanceForCreditLossesWriteOffs97.896.396.797.795.096.090.097.396.697.394.995.595.897.196.397.497.491.288.691.380.083.3

us-gaap:FinanceReceivables, us-gaap:ConsumerPortfolioSegment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-30
Value2121112111222122234244
Percentage of FinancingReceivableAllowanceForCreditLossesWriteOffs2.23.73.32.35.04.010.02.73.42.75.14.54.22.93.72.62.68.811.48.720.016.7

us-gaap:LoanRestructuringModification

us-gaap:FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1

us-gaap:PaymentDeferral



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-30
Value10-51700000-540000227141116-1010
Percentage of FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1100.0100.0100.00.00.00.00.00.0100.0100.00.00.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ForeignCurrencyTransactionGainLossBeforeTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-30
Value11111111111212121211111111101110111091010912
Percentage of ForeignCurrencyTransactionGainLossBeforeTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:GainLossOnForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstruments



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302011-09-30
Value0.00.00.00.00.00.00.00.00.00.00.00.00.01000000.00.00.00.01000000.00.00.01000000.01000000.0
Percentage of GainLossOnForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstruments0.00.00.00.00.00.00.00.00.00.00.00.00.0100.00.00.00.0100.00.00.0100.0100.0

us-gaap:IncreaseDecreaseInAccruedLiabilities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-312010-03-31
Value-121247-59-27-29-221345-225-343130103513-52-3130161-61-72-85-59-16
Percentage of IncreaseDecreaseInAccruedLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInDeposits



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-312010-03-31
Value-2960613141377-1586-660-7728876-2079-5-312282328-35371168390787184-19234425082550600122656
Percentage of IncreaseDecreaseInDeposits100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0

us-gaap:IncreaseDecreaseInInterestAndDividendsReceivable



Period End2020-03-312019-09-302019-06-302019-03-312018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-31
Value-8-13-8201226204-31345-26110-14-510
Percentage of IncreaseDecreaseInInterestAndDividendsReceivable100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0

us-gaap:IncrementalCommonSharesAttributableToShareBasedPaymentArrangements



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-31
Value0-11122220233122102220222110001
Percentage of IncrementalCommonSharesAttributableToShareBasedPaymentArrangements0.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.00.0100.0100.0100.0100.0100.00.00.00.0100.0

us-gaap:InterestAndDividendIncomeOperating



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value609659711727710704675650590578579529496484480473472457448444435438436441435456439443446456460470478481463431434445456476476479511552563
Percentage of InterestAndDividendIncomeOperating100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InterestAndFeeIncomeLoansAndLeasesHeldInPortfolio



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value517564619635621581568509498500453421412411406406395390389379383381385376381388390400408411405369375399412412
Percentage of InterestAndFeeIncomeLoansAndLeasesHeldInPortfolio100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InterestExpenseDeposits



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value5670736752352816131199101010101011111112111111131515171819242322272935
Percentage of InterestExpenseDeposits100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InterestExpenseShortTermBorrowings



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302016-12-312016-09-30
Value002611000300
Percentage of InterestExpenseShortTermBorrowings0.00.0100.0100.0100.0100.00.00.00.0100.00.00.0

us-gaap:InterestIncomeExpenseAfterProvisionForLoanLoss



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value102536551559619599619537528522483454420434396299373396374399413409405401404401400405416420385344346282296240
Percentage of InterestIncomeExpenseAfterProvisionForLoanLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InterestIncomeExpenseNet



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value513544586603606614599590549545546500470455450445447433422421413415414416410430412414416424427435443444423391395405404422415396385402384
Percentage of InterestIncomeExpenseNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementBusinessSegments

cma:BusinessBank



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-30
Value380403420420412413341330347356336332341361355357381378373
Percentage of InterestIncomeExpenseNet74.174.171.769.768.068.957.860.163.765.267.270.674.980.279.879.988.089.688.6

cma:Finance



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-30
Value-44-49-38-24-15-16261-25-30-49-71-89-114-111-113-158-163-154
Percentage of InterestIncomeExpenseNet-8.6-9.0-6.5-4.0-2.5-2.74.40.2-4.6-5.5-9.8-15.1-19.6-25.3-24.9-25.3-36.5-38.6-36.6

cma:FinanceOther



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-30
Value-33-36-23-91-14013-16-20-40-63-83-108-107-108-154-159-152
Percentage of InterestIncomeExpenseNet-6.4-6.6-3.9-1.50.2-0.26.82.4-2.9-3.7-8.0-13.4-18.2-24.0-24.0-24.2-35.6-37.7-36.1

cma:Other1



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-30
Value1113151516151412910986645442
Percentage of InterestIncomeExpenseNet2.12.42.62.52.62.52.42.21.71.81.81.71.31.30.91.10.90.90.5

cma:OtherMarkets



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-30
Value86929694919583788387827986908985868785
Percentage of InterestIncomeExpenseNet16.816.916.415.615.015.914.114.215.215.916.416.818.920.020.019.019.920.620.2

cma:RetailBank



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-30
Value125134142146146141169165171165162160156156155155160158155
Percentage of InterestIncomeExpenseNet24.424.624.224.224.123.528.630.131.430.232.434.034.334.734.834.737.037.436.8

cma:WealthManagement



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-30
Value41434746474640414345424141414243464545
Percentage of InterestIncomeExpenseNet8.07.98.07.67.87.76.87.57.98.28.48.79.09.19.49.610.610.710.7

stpr:CA



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-30
Value182195203208205199183180188184178171178181178175190186180
Percentage of InterestIncomeExpenseNet35.535.834.634.533.833.231.032.834.533.735.636.439.140.240.039.143.944.142.8

stpr:MI



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-30
Value163172185186187185167169175172167170163169166174182179178
Percentage of InterestIncomeExpenseNet31.831.631.630.830.930.928.330.832.131.533.436.235.837.637.338.942.042.442.3

stpr:TX



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-30
Value115121125124122121117109115123113113111118119121129129130
Percentage of InterestIncomeExpenseNet22.422.221.320.620.120.219.819.921.122.522.624.024.426.226.727.129.830.630.9

us-gaap:InterestPaid



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-312010-03-31
Value1021151271229859403335272736243219301926192724252529323463
Percentage of InterestPaid100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LaborAndRelatedExpense



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value242257253245265254250255235225219233219247247248262243251253245248240247255245251253250261245235238234224213
Percentage of LaborAndRelatedExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LegalFees



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value255414431455545565556855578891289998
Percentage of LegalFees100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:NoninterestExpense



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value425451435424433448452448446483463457457461493519460486461436460419397404406473417416416427449433448478460409415437402397404425399429397
Percentage of NoninterestExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementBusinessSegments

cma:BusinessBank



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-312010-03-31
Value194203199195198210182184210199196197195215222207208202176200149152143146146159160162
Percentage of NoninterestExpense45.645.045.746.045.746.540.641.343.543.042.943.142.343.642.845.042.843.840.443.535.638.335.436.035.135.538.640.1

cma:Finance



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-312010-03-31
Value00-100-1-1-1-1-1-1-1-1-12222323-29233332
Percentage of NoninterestExpense0.00.0-0.20.00.0-0.2-0.2-0.2-0.2-0.2-0.2-0.2-0.2-0.20.40.40.40.40.70.40.7-7.30.50.70.70.70.70.5

cma:FinanceOther



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-31
Value1018181518171313111010116811160479-181111162415
Percentage of NoninterestExpense2.44.04.13.54.23.82.92.92.32.22.22.41.31.62.10.21.20.00.91.52.1-4.52.72.73.85.43.6

cma:Other1



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-31
Value101719151818141412111112799-14-215611981324
Percentage of NoninterestExpense2.43.84.43.54.24.03.13.12.52.42.42.61.51.81.7-0.20.8-0.40.21.11.42.82.22.03.15.4

cma:OtherMarkets



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-312010-03-31
Value93969092919894911191141101061131121161051081101101025651454844242121
Percentage of NoninterestExpense21.921.320.721.721.021.721.020.424.624.624.123.224.522.722.422.822.223.925.222.213.412.811.111.810.65.45.15.2

cma:RetailBank



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-312010-03-31
Value149156149147145153178177188184180179188195205179192185182176178185174171175184162154
Percentage of NoninterestExpense35.134.634.334.733.533.839.739.738.939.739.439.240.839.639.538.939.540.141.738.342.546.643.142.142.141.139.038.1

cma:WealthManagement



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-31
Value727569677272757274707170727581738074747783787678798178
Percentage of NoninterestExpense16.916.615.915.816.615.916.716.115.315.115.515.315.615.215.615.916.516.117.016.719.819.618.819.219.018.118.8

stpr:CA



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-31
Value98105102991001041051061071039896101110120104108102100100102102100969799
Percentage of NoninterestExpense23.123.323.423.323.123.023.423.822.222.221.421.021.922.323.122.622.222.122.921.724.325.724.823.623.322.1

stpr:MI



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-31
Value140142139134140143144144151144145150149161159150162152128155157166159161168179
Percentage of NoninterestExpense32.931.532.031.632.331.632.132.331.331.131.732.832.332.730.632.633.333.029.433.737.541.839.439.740.440.0

stpr:TX



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-31
Value84908684849092929592949492102113100102979496959689909193
Percentage of NoninterestExpense19.820.019.819.819.419.920.520.619.719.920.620.620.020.721.821.721.021.021.620.922.724.222.022.221.920.8

us-gaap:NoninterestIncome



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value237266256250238234248244285275276271267272269246270264261256225215220208214208200197211206201202207186194194
Percentage of NoninterestIncome100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementBusinessSegments

cma:BusinessBank



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-312010-03-31
Value127143140136136137126121156148152144146145142135147145140142101971008777817776
Percentage of NoninterestIncome53.653.854.754.457.158.550.849.654.753.855.153.154.753.352.854.954.454.953.655.544.945.145.541.838.539.337.239.2

cma:Finance



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-312010-03-31
Value141312144-712111413101110131314151514121615151414131612
Percentage of NoninterestIncome5.94.94.75.61.7-3.04.84.54.94.73.64.13.74.84.85.75.65.75.44.77.17.06.86.77.06.37.76.2

cma:FinanceOther



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-31
Value121716137-313131615121511161791711151316171716171824
Percentage of NoninterestIncome5.16.46.25.22.9-1.35.25.35.65.54.35.54.15.96.33.76.34.25.75.17.17.97.77.78.58.711.6

cma:FinanceOther1MemberDomain



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value1217161375-414131716
Percentage of NoninterestIncome5.16.46.25.22.90.0-1.75.65.36.05.8

cma:Other1



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-31
Value-244-133122224134-52-411022235
Percentage of NoninterestIncome-0.81.51.6-0.41.31.30.40.80.70.70.71.50.41.11.5-2.00.7-1.50.40.40.00.90.91.01.52.4

cma:OtherMarkets



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-312010-03-31
Value87939491878690881111071051001009710193989693884542414025141110
Percentage of NoninterestIncome36.735.036.736.436.636.836.336.138.938.938.036.937.535.737.537.836.336.435.634.420.019.518.619.212.56.85.35.2

cma:RetailBank



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-312010-03-31
Value28373133313542424949484848504843484946434442414141424244
Percentage of NoninterestIncome11.813.912.113.213.015.016.917.217.217.817.417.718.018.417.817.517.818.617.616.819.619.518.619.720.520.420.322.7

cma:WealthManagement



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-31
Value706969686466676864636464626162595859605864596264656564
Percentage of NoninterestIncome29.525.927.027.226.928.227.027.922.522.923.223.623.222.423.024.021.522.323.022.728.427.428.230.832.531.630.9

stpr:CA



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-31
Value3652414041434239434145414244393841383738383738343533
Percentage of NoninterestIncome15.219.516.016.017.218.416.916.015.114.916.315.115.716.214.515.415.214.414.214.816.917.217.316.317.516.0

stpr:MI



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-31
Value7273747271757373827981838082817682858581928389879298
Percentage of NoninterestIncome30.427.428.928.829.832.129.429.928.828.729.330.630.030.130.130.930.432.232.631.640.938.640.541.846.047.6

stpr:TX



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-31
Value3031313432333031333333323433313032343136343635313131
Percentage of NoninterestIncome12.711.712.113.613.414.112.112.711.612.012.011.812.712.111.512.211.912.911.914.115.116.715.914.915.515.0

us-gaap:NoninterestIncomeOtherOperatingIncome



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value203923222529222326253129272929172326262639343733283930283429152937182220
Percentage of NoninterestIncomeOtherOperatingIncome100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:VariableInterestEntitiesByClassificationOfEntity

us-gaap:VariableInterestEntityNotPrimaryBeneficiary



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-31
Value0100101110010-10000010-2-1-2-14-13-14-15-14-14
Percentage of NoninterestIncomeOtherOperatingIncome0.02.60.00.04.00.04.54.33.80.00.03.40.0-3.40.00.00.00.00.03.80.0-5.9-2.7-6.1-50.0-33.3-46.7-53.6-41.2-48.3

us-gaap:OccupancyNet



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value374139373738373840383838404039384141393846463940413939404041443840403941
Percentage of OccupancyNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302014-12-312014-09-302014-06-302014-03-312013-06-302013-03-31
Value-7-7-7-6-7-7-7-7-7-6-7-700010201001
Percentage of OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.0100.00.0100.00.0100.00.00.0100.0

us-gaap:OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-31
Value247-8309190-42-109-65-1140-132-322795-6140-383151-201460-1119
Percentage of OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value155-20143730000
Percentage of OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax100.0100.0100.0100.0100.00.00.00.00.0

us-gaap:OtherComprehensiveIncomeLossNetOfTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-31
Value4091014613196-22-36-103-52184-91333101-8451-2642-95-132166330
Percentage of OtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-31
Value4091014613196-22-36-103-52184-91333101-8451-2642-95-132166330
Percentage of OtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-31
Value-7-129-2-3-3-6-6-60-3-4-4-41-5966-45111211-14633-7-61411
Percentage of OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-06-302018-03-312017-12-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-06-302013-03-31
Value0000-80000000000-2000100
Percentage of OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax0.00.00.00.0100.00.00.00.00.00.00.00.00.00.00.0100.00.00.00.0100.00.00.0

us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-06-302018-03-312017-12-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-06-302013-03-31
Value0000-60000000000-1000100
Percentage of OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax0.00.00.00.0100.00.00.00.00.00.00.00.00.00.00.0100.00.00.00.0100.00.00.0

us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-06-302018-03-312017-12-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-06-302013-03-31
Value0000-20000000000-1000000
Percentage of OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax0.00.00.00.0100.00.00.00.00.00.00.00.00.00.00.0100.00.00.00.00.00.00.0

us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesBeforeTax



Period End2020-03-312019-09-302019-06-302019-03-312018-09-30
Value30-100
Percentage of OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesBeforeTax100.00.0100.00.00.0

us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax



Period End2020-03-312019-03-31
Value20
Percentage of OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax100.00.0

us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesTax



Period End2020-03-312019-03-31
Value1000000.00.0
Percentage of OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesTax100.00.0

us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-06-302013-03-31
Value-1672-9-10-11-15-15-13-13-12-13-17-48910-17-18-18-17-9-12-8-10-23-21
Percentage of OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value205-25184740000
Percentage of OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax100.0100.0100.0100.0100.00.00.00.00.0

us-gaap:OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax



Period End2020-03-312019-09-302019-06-302019-03-312018-09-30
Value157143630
Percentage of OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax100.0100.0100.0100.00.0

us-gaap:OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value48-641110000
Percentage of OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax100.0100.0100.0100.0100.00.00.00.00.0

us-gaap:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-31
Value323-1038120109-55-142-99-323-2-210-5142149-9961-624581-312294-1835
Percentage of OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-31
Value247-8309184-42-109-65-214-1-133-322794-6239-402951-201461-1122
Percentage of OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-31
Value76-282925-13-33-34-19-1-77-191555-3722-221630-11833-713
Percentage of OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherInterestAndDividendIncome



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value1820171717281817161714131085464335334433333432233
Percentage of OtherInterestAndDividendIncome100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherNoninterestExpense



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value252418221720231532333733293732384439393943533938375045465559373336353535
Percentage of OtherNoninterestExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentsForProceedsFromLoansAndLeases



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-312010-03-31
Value3174-1095-266153415155398-18-1771122-752-154-11021040352208-752701487890-16813961026-971357-946-1135
Percentage of PaymentsForProceedsFromLoansAndLeases100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentsOfDividendsCommonStock



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-312010-03-31
Value9599100104995153524741404038373738373636363634312920188
Percentage of PaymentsOfDividendsCommonStock100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentsToAcquireAvailableForSaleSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-312010-03-31
Value920625678511153245044145748647016996496404652912295878568487959473441499955869448300
Percentage of PaymentsToAcquireAvailableForSaleSecurities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentsToAcquireFederalHomeLoanBankStock



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-03-312015-03-31
Value31015233160410202200210
Percentage of PaymentsToAcquireFederalHomeLoanBankStock100.00.0100.0100.0100.00.0100.00.0100.0100.00.00.0100.00.0

us-gaap:ProceedsFromIssuanceOfCommonStock



Period End2020-03-312019-09-302019-06-302019-03-312018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-31
Value315664016676131113126910261075
Percentage of ProceedsFromIssuanceOfCommonStock100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromLifeInsurancePolicies



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-31
Value83052031023366
Percentage of ProceedsFromLifeInsurancePolicies100.0100.00.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-312010-03-31
Value598647624504487451444417427378393440523400336421440449393453503414411938937592368
Percentage of ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromSaleOfAvailableForSaleSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value00009870500012590-140143140370000
Percentage of ProceedsFromSaleOfAvailableForSaleSecurities0.00.00.00.0100.00.0100.00.00.00.0100.00.0100.00.0100.0100.0100.00.0100.00.00.00.00.0

us-gaap:ProvisionForLoanLeaseAndOtherLosses



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value41183544-13160-29121724171635164914860264714251199813161622192218354546
Percentage of ProvisionForLoanLeaseAndOtherLosses100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType

us-gaap:FinanceReceivables



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-31
Value380140-3743-131-23141631151139144714163283516446810131223823
Percentage of ProvisionForLoanLeaseAndOtherLosses92.51750.0-105.797.7100.00.079.3116.794.1129.288.268.8111.487.595.995.3105.0107.774.5114.3200.080.054.588.9125.0100.075.0104.542.1104.5

us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType, us-gaap:FinancingReceivablePortfolioSegment

us-gaap:FinanceReceivables, us-gaap:CommercialPortfolioSegment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-30
Value384155-3943-8-1-2120212117124012491457025371742
Percentage of ProvisionForLoanLeaseAndOtherLosses93.41937.5-111.497.761.50.072.4166.7123.587.5100.075.0114.375.0100.098.0116.796.278.7121.4200.040.0

us-gaap:FinanceReceivables, us-gaap:ConsumerPortfolioSegment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-30
Value-4-1520-52-2-6-510-2-1-12-2-4-73-2-102
Percentage of ProvisionForLoanLeaseAndOtherLosses-1.0-187.55.70.038.50.06.9-50.0-29.441.7-11.8-6.2-2.912.5-4.1-2.7-11.711.5-4.3-7.10.040.0

us-gaap:InvestmentType

us-gaap:LoanOriginationCommitments



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-31
Value-31-2210-1-6-21-725-4227-3-212-2-2151-204-111-1
Percentage of ProvisionForLoanLeaseAndOtherLosses-7.5-25.05.72.3-0.00.020.7-16.75.9-29.211.831.2-11.412.54.14.7-5.0-7.725.5-14.3-100.020.045.511.1-25.00.025.0-4.557.9-4.5

us-gaap:StatementBusinessSegments

cma:BusinessBank



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-03-312012-03-31
Value3963952-6-1-1710161210246151306125-43516202
Percentage of ProvisionForLoanLeaseAndOtherLosses96.4111.4118.246.20.058.683.366.770.662.512.593.9102.0115.4129.8178.6-80.0318.2177.8125.09.1

cma:FinanceOther



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-03-312012-03-31
Value01-42-2-42-12-55-1-1-33-22-8-1-42
Percentage of ProvisionForLoanLeaseAndOtherLosses0.02.9-9.1-15.40.013.816.7-4.211.8-31.231.2-2.0-0.7-11.56.4-14.340.0-72.7-11.1-25.09.1

cma:Other1



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-03-312012-03-31
Value01-42-2-42-12-55-1-1-33-22-8-1-42
Percentage of ProvisionForLoanLeaseAndOtherLosses0.02.9-9.1-15.40.013.816.7-4.211.8-31.231.2-2.0-0.7-11.56.4-14.340.0-72.7-11.1-25.09.1

cma:OtherMarkets



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-03-312012-03-31
Value46-913-84-2-8158115-2-8-11106-6-8-10-11
Percentage of ProvisionForLoanLeaseAndOtherLosses11.2-25.729.561.50.06.9-66.762.547.168.831.2-4.1-5.4-42.321.342.9-120.0-72.7-111.1-6.24.5

cma:RetailBank



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-03-312012-03-31
Value3-21-41-94-151210132-8-80-6266
Percentage of ProvisionForLoanLeaseAndOtherLosses0.7-5.72.330.80.031.033.3-4.229.475.062.52.02.07.7-17.0-57.10.0-54.522.237.527.3

cma:WealthManagement



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-03-312012-03-31
Value12-3-5-521-410-2-1-13-5-3-9-17-10-8-612
Percentage of ProvisionForLoanLeaseAndOtherLosses2.9-8.6-11.438.50.0-3.4-33.341.7-11.8-6.2-6.26.1-3.4-11.5-19.1-7.1140.0-90.9-88.9-37.554.5

stpr:CA



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-03-312012-03-31
Value51-6-4-13-9-2242421-417-6244-314141121-3
Percentage of ProvisionForLoanLeaseAndOtherLosses12.4-17.1-9.17.70.031.0-16.7100.0141.2131.2-25.034.7-4.192.38.5-21.4280.0127.3122.2131.2-13.6

stpr:MI



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-03-312012-03-31
Value24-1-10541338-2-2133-66-13-8-8-93-8-3
Percentage of ProvisionForLoanLeaseAndOtherLosses5.8-2.9-22.7-38.50.0-3.4275.033.3-11.8-12.581.26.1-4.123.1-27.7-57.1-160.0-81.833.3-50.0-13.6

stpr:TX



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-03-312012-03-31
Value2905049-11-9-15-13-22-15-9-3321691043213226825
Percentage of ProvisionForLoanLeaseAndOtherLosses70.6142.9111.484.60.051.7-108.3-91.7-88.2-56.2-18.865.3114.238.591.5150.060.0200.066.750.0113.6

us-gaap:StatementEquityComponents

us-gaap:StockIssuedDuringPeriodSharesShareBasedCompensation

us-gaap:CommonStock



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-31
Value000000010002200000000001010
Percentage of StockIssuedDuringPeriodSharesShareBasedCompensation100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StockIssuedDuringPeriodValueShareBasedCompensation



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-31
Value-10-12-4-463112813691301311-1104374932950-1
Percentage of StockIssuedDuringPeriodValueShareBasedCompensation100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0

us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-31
Value-14-2611-13-20-1120-1-251442-35-12-7-16-1-1-14-11-15-32-30
Percentage of StockIssuedDuringPeriodValueShareBasedCompensation1400.00.0-100.050.0325.050.00.0-35.516.70.0-7.7-36.210.830.818.2318.20.050.0-233.3-228.6-25.0-11.1-466.7-37.9-300.00.03000.0

us-gaap:RetainedEarnings



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-312010-03-31
Value-3-542-1-223-4-17-4-2-6-14-7-4-6-10-10-8-20-7-9-8-13-26-15-3
Percentage of StockIssuedDuringPeriodValueShareBasedCompensation300.00.0-200.0-50.0550.0-75.0-66.7-54.8-33.3-25.0-46.2-20.3-5.4-30.8-54.590.90.00.0-266.7-28.60.0-77.8-300.0-27.6-260.00.01500.00.0

us-gaap:TreasuryStock



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-312010-03-31
Value1680-4231-5105914102010812313153422182551726483358453
Percentage of StockIssuedDuringPeriodValueShareBasedCompensation-1600.00.0400.0100.0-775.0125.0166.7190.3116.7125.0153.8156.594.6100.0136.4-309.10.050.0600.0357.1125.0188.9866.7165.5660.00.0-4500.00.0

us-gaap:StatementEquityComponents

us-gaap:TreasuryStockSharesAcquired

us-gaap:CommonStock



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-31
Value-3-355555111221121111111111210
Percentage of TreasuryStockSharesAcquired100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:TreasuryStockValueAcquiredCostMethod



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-312010-03-31
Value1951513704254345001691591481391391189997654965604966605961807436212
Percentage of TreasuryStockValueAcquiredCostMethod100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-30
Value000007
Percentage of TreasuryStockValueAcquiredCostMethod0.00.00.00.00.01.4

us-gaap:TreasuryStock



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-312010-03-31
Value195-26093704254344931691591481391391189997654965604966605961807436212
Percentage of TreasuryStockValueAcquiredCostMethod100.0-1727.8100.0100.0100.098.6100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value02212222202121111121212222222
Percentage of UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted0.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cma:AllowanceForOffBalanceSheetCreditLosses



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value6231293130303334404248464145434645485039414342373634363632353625262730323537
Percentage of AllowanceForOffBalanceSheetCreditLosses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cma:AverageBalanceDuringPeriodDeposits



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-312011-03-312010-12-312010-03-312009-12-312008-12-31
Value5676857255716549955399656093558305609013056493571285777963958065565215670847559140573985699010035516353384527705069248311405984059839486385714009142003
Percentage of AverageBalanceDuringPeriodDeposits100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementBusinessSegments

cma:BusinessBank



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-312011-03-312010-12-312010-03-312009-12-312008-12-31
Value30230502289172825128463302862658227314-282811528748296485093001928429291082883139730229301697992881527351270232551423997200842008419001177501539514993
Percentage of AverageBalanceDuringPeriodDeposits53.387.851.951.452.754.047.648.7-21.549.850.351.379.751.750.351.360.653.152.752.979.752.251.251.250.349.749.548.146.038.435.7

cma:Finance



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-312011-03-312010-12-312010-03-312009-12-312008-12-31
Value1136-11520492174113092910938235127015614279862103-1021293170-13128258353275161249249638121845647252
Percentage of AverageBalanceDuringPeriodDeposits2.0-20.13.74.02.11.72.01.539.20.50.30.21.10.20.10.2-2.10.40.20.3-1.30.20.50.70.50.30.61.63.211.417.3

cma:FinanceOther



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-31
Value1318-106226323551262105412359163540633935821362333319-12476362447-6382527570447330354
Percentage of AverageBalanceDuringPeriodDeposits2.3-18.54.14.32.31.92.21.626.90.70.60.63.30.60.60.6-2.50.80.60.8-0.60.71.01.10.90.70.9

cma:Other1



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-31
Value182921418113212514293-1613618321614264271216-22642692777254269217172169
Percentage of AverageBalanceDuringPeriodDeposits0.31.60.40.30.20.20.30.2-12.30.20.30.42.20.50.50.4-0.40.40.50.50.70.50.50.40.30.3

cma:OtherMarkets



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-312011-03-312010-12-312010-03-312009-12-312008-12-31
Value803242785978297898852080827668-4677308115791515082257650766516575937096698618265846069590156752628229822982160198515981387
Percentage of AverageBalanceDuringPeriodDeposits14.17.314.114.214.615.214.513.7-35.413.714.213.723.514.213.513.534.712.812.412.318.111.911.411.211.25.45.75.55.14.03.3

cma:RetailBank



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-312011-03-312010-12-312010-03-312009-12-312008-12-31
Value21195115207612064920470207652416124064882391823935237951202365423546231101302307922747223781102204221890213612104920373173601736016974167181740916965
Percentage of AverageBalanceDuringPeriodDeposits37.320.137.337.537.937.043.342.967.742.341.941.218.840.741.740.827.439.039.639.311.040.041.040.541.542.242.843.043.343.440.4

cma:WealthManagement



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-31
Value40256137753740380139883852379635405441063978-1140304213417169418840603996100392436163816368236112800
Percentage of AverageBalanceDuringPeriodDeposits7.110.76.86.87.07.16.96.826.97.27.26.9-1.76.97.57.414.57.17.17.010.07.16.87.27.37.56.9

stpr:CA



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-31
Value174664241672516325162451689416642170912321731617344172093191767416933166542631837217275168376361635015370147821435613688
Percentage of AverageBalanceDuringPeriodDeposits30.874.130.029.730.130.129.830.5178.530.730.429.849.930.430.029.455.431.130.129.563.429.628.828.028.328.3

stpr:MI



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-31
Value20748122201641981619893207212090421227-421641216982218476219442155321696842194621706217101702121420694206422025519415
Percentage of AverageBalanceDuringPeriodDeposits36.521.336.236.036.836.937.437.8-3.138.338.038.411.937.838.138.317.737.137.838.116.938.538.839.140.040.2

stpr:TX



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-31
Value920490870586708698890489679188-8794009632101137398601005210374-2510753109591101021106331072410875995910229
Percentage of AverageBalanceDuringPeriodDeposits16.215.715.615.816.115.916.116.4-66.916.616.917.511.417.017.818.3-5.318.219.119.32.119.320.120.619.621.2

cma:AverageBalanceDuringPeriodLoansAndLeasesReceivableNetOfDeferredIncome



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-312011-03-312010-12-312010-03-312009-12-312008-12-31
Value49604-3508875096349677485844922548421127486634872347900-27492064946948392-274897248833481512614715946725450754461742269395513955140517413134616251765
Percentage of AverageBalanceDuringPeriodLoansAndLeasesReceivableNetOfDeferredIncome100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementBusinessSegments

cma:BusinessBank



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-312011-03-312010-12-312010-03-312009-12-312008-12-31
Value4259316438894392642538415913833237368144375593758036754-59382433857437561-673811338109377632293674636367349273475332242296092963830286309183540240867
Percentage of AverageBalanceDuringPeriodLoansAndLeasesReceivableNetOfDeferredIncome85.9-533.386.286.285.685.677.977.2113.477.277.176.7218.577.778.077.6248.177.878.078.487.777.977.877.577.976.374.974.774.876.778.9

cma:Finance



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-312011-03-312010-12-312010-03-312009-12-312008-12-31
Value0000000000000000000000000022026911
Percentage of AverageBalanceDuringPeriodLoansAndLeasesReceivableNetOfDeferredIncome0.0-0.00.00.00.00.00.00.00.00.00.00.0-0.00.00.00.0-0.00.00.00.00.00.00.00.00.00.00.10.10.00.00.0

cma:OtherMarkets



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-312011-03-312010-12-312010-03-312009-12-312008-12-31
Value88201749135863980828384828776406881767802752354851582617572-107963786072006972556838641473543693296029603653349442564560
Percentage of AverageBalanceDuringPeriodLoansAndLeasesReceivableNetOfDeferredIncome17.8-5800.018.017.016.317.316.815.853.516.816.015.7-200.017.316.715.637.016.316.115.026.415.414.614.216.58.77.59.08.59.28.8

cma:RetailBank



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-312011-03-312010-12-312010-03-312009-12-312008-12-31
Value2075-4211421072103205757665807-75834586558959587158795867255835577055541856055554538152765462510651065386559960076342
Percentage of AverageBalanceDuringPeriodLoansAndLeasesReceivableNetOfDeferredIncome4.2133.34.24.14.24.211.712.0-5.512.012.012.3-33.311.911.912.1-92.611.911.811.56.911.911.911.911.812.912.913.313.613.012.3

cma:WealthManagement



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-31
Value4936-15488449305036493651275246-10527052785251235092501649641550244954483414480848044767458845654807
Percentage of AverageBalanceDuringPeriodLoansAndLeasesReceivableNetOfDeferredIncome10.0500.09.69.710.110.210.410.8-7.910.810.811.0-85.210.310.110.3-55.610.310.110.05.410.210.310.610.310.812.2

stpr:CA



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-31
Value18027-15518393189281876818074184351834778179161819417520301763717708172831401678916429161931311550915439148241354212096
Percentage of AverageBalanceDuringPeriodLoansAndLeasesReceivableNetOfDeferredIncome36.35166.736.137.137.837.237.537.961.436.837.336.6-111.135.835.835.7-518.534.333.633.650.232.933.032.930.428.6

stpr:MI



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-31
Value12191-5212554127041255712424126411260440126121271212746-26124881266012774-65132231329013223-641324813482134731365013829
Percentage of AverageBalanceDuringPeriodLoansAndLeasesReceivableNetOfDeferredIncome24.61733.324.724.925.325.625.726.031.525.926.126.696.325.425.626.4240.727.027.227.5-24.528.128.929.930.632.7

stpr:TX



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-31
Value1056630108051069210270970298629830-5999591001510111-85105661084010763-92109971125411535125111471096610364100719295
Percentage of AverageBalanceDuringPeriodLoansAndLeasesReceivableNetOfDeferredIncome21.3-1000.021.221.020.720.020.020.3-46.520.520.621.1314.821.521.922.2340.722.523.024.047.923.623.523.022.622.0

cma:CarryingValueOfStandbyAndCommercialLettersOfCredit



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value333233323334333642404447414450484749546155556064655967788282949786898980838370
Percentage of CarryingValueOfStandbyAndCommercialLettersOfCredit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cma:CarryingValueOfStandbyAndCommercialLettersOfCreditIncludedInAllowanceForCreditLossesOnLendingRelatedCommitments



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value10667768101415151913121513111214171211131412812161613152317171717191917
Percentage of CarryingValueOfStandbyAndCommercialLettersOfCreditIncludedInAllowanceForCreditLossesOnLendingRelatedCommitments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cma:CarryingValueOfStandbyAndCommercialLettersOfCreditIncludedInDeferredFees



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-31
Value2326272526282526282529282832353536374044434447505351556266697974697272636464
Percentage of CarryingValueOfStandbyAndCommercialLettersOfCreditIncludedInDeferredFees100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cma:CarryingValueOfUnusedCommitmentsToExtendCredit



Period End2020-03-312019-12-312019-09-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-31
Value5125232324252426272633293030353334332730302825281920201920138910131316
Percentage of CarryingValueOfUnusedCommitmentsToExtendCredit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:BalanceSheetLocation, us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, cma:DerivativePurpose

cma:Carryingvalueofhedgeditem

us-gaap:LongTermDebt, us-gaap:InterestRateSwap, us-gaap:FairValueHedging, cma:RiskManagementDerivatives



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value36343469351127582663
Percentage of Carryingvalueofhedgeditem100.0100.0100.0100.0100.0

us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis

cma:CreditRelatedFinancialInstruments

us-gaap:FairValueInputsLevel3, us-gaap:EstimateOfFairValueFairValueDisclosure



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302013-12-31
Value84575655555757606867707674738079838389958385919488
Percentage of CreditRelatedFinancialInstruments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueByMeasurementBasis

us-gaap:CarryingReportedAmountFairValueDisclosure



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302012-12-31
Value8457565555575760686770767473807983838995838591949188-90-103
Percentage of CreditRelatedFinancialInstruments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.00.00.0

us-gaap:EstimateOfFairValueFairValueDisclosure



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302012-12-31
Value8457565555575760686770767473807983838995838591949188-90-103
Percentage of CreditRelatedFinancialInstruments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.00.00.0

cma:Cumulativeeffectofchangeinaccountingprinciple



Period End2020-01-012019-01-01
Value13-14
Percentage of Cumulativeeffectofchangeinaccountingprinciple100.0100.0

us-gaap:AdjustmentsForNewAccountingPronouncements, us-gaap:StatementEquityComponents

us-gaap:AccountingStandardsUpdate201613, us-gaap:RetainedEarnings



Period End2020-01-01
Value13
Percentage of Cumulativeeffectofchangeinaccountingprinciple100.0

us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings



Period End2020-01-012019-01-01
Value13-14
Percentage of Cumulativeeffectofchangeinaccountingprinciple100.0100.0

us-gaap:AdjustmentsForNewAccountingPronouncements

cma:Dayonedecreaseintheoverallallowanceforcreditlosses

us-gaap:AccountingStandardsUpdate201613



Period End2020-01-012019-01-01
Value-170
Percentage of Dayonedecreaseintheoverallallowanceforcreditlosses100.00.0

cma:DepositsCustomerCertificatesDeposits



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-31
Value295829782853244127762131205120892071216523422438259728062967323034013552412643674497442146984962509950635180559457535531574260456145580859805551567254825723589359796413
Percentage of DepositsCustomerCertificatesDeposits100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis

us-gaap:FairValueInputsLevel2, us-gaap:EstimateOfFairValueFairValueDisclosure



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302013-12-31
Value2959296828422427275121002013206120412142230924182523273129523221339035364119435744894411468649555055
Percentage of DepositsCustomerCertificatesDeposits100.099.799.699.499.198.598.198.798.698.998.699.297.297.399.599.799.799.599.899.899.899.899.799.999.8

us-gaap:FairValueByMeasurementBasis

us-gaap:CarryingReportedAmountFairValueDisclosure



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302012-12-31
Value2958297828532441277621312051208920712165234224382597280629673230340135524126436744974421469849625099506351805531
Percentage of DepositsCustomerCertificatesDeposits100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EstimateOfFairValueFairValueDisclosure



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302012-12-31
Value2959296828422427275121002013206120412142230924182523273129523221339035364119435744894411468649555090505551755535
Percentage of DepositsCustomerCertificatesDeposits100.099.799.699.499.198.598.198.798.698.998.699.297.297.399.599.799.799.599.899.899.899.899.799.999.899.899.9100.1

cma:EfficiencyRatio



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-312011-03-312010-12-312010-03-312009-12-312008-12-31
Value0.56570.0115999999999999440.51540.49650.50810.52930.53240.5633-0.00170000000000003480.56240.58630.6163-0.0134999999999999560.68150.72480.66070.0069000000000000170.67080.63680.68550.00319999999999998060.62870.63350.65790.67580.6950.69050.69050.6730.66450.69250.6617
Percentage of EfficiencyRatio100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementBusinessSegments

cma:BusinessBank



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-312011-03-312010-12-312010-03-312009-12-312008-12-31
Value0.38470.00349999999999994760.35620.34980.36230.38240.390.40720.0035000000000000030.39320.40190.4133-0.0060999999999999940.42380.44460.41410.0044000000000000150.38410.34190.392-0.00319999999999998060.32120.30070.31960.3230.34740.38140.38140.37770.38780.3940.4529
Percentage of EfficiencyRatio68.030.269.170.571.372.273.372.3-205.969.968.567.145.262.261.362.763.857.353.757.2-100.051.147.548.647.850.055.256.158.456.968.4

cma:OtherMarkets



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-312011-03-312010-12-312010-03-312009-12-312008-12-31
Value0.53760.0069999999999999510.47190.49560.50990.53970.53720.54970.0070999999999999950.58790.58450.59310.00429999999999997050.59870.60980.5809-0.0063999999999999610.59860.61450.60010.0088999999999999630.41460.38730.43390.42110.44620.42380.41670.40840.43950.41820.9559
Percentage of EfficiencyRatio95.060.391.699.8100.4102.0100.997.6-417.6104.599.796.2-31.987.984.187.9-92.889.296.587.5278.165.961.166.062.364.261.460.766.160.4144.5

cma:RetailBank



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-312011-03-312010-12-312010-03-312009-12-312008-12-31
Value0.96030.0179000000000000270.84540.82260.81120.86810.84050.85030.0011000000000001010.85510.84790.86-0.0097000000000000420.94571.01120.88470.00459999999999993750.89330.89880.9092-0.00060000000000004490.94640.90060.91440.89370.87730.89190.89190.91260.88440.91690.8321
Percentage of EfficiencyRatio169.8154.3164.0165.7159.7164.0157.9150.9-64.7152.0144.6139.571.9138.8139.5133.966.7133.2141.1132.6-18.8150.5142.2139.0132.2126.2129.2135.6133.1132.4125.8

cma:WealthManagement



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-31
Value0.64280.0141000000000000010.59790.58990.64410.63930.69030.6710.0056000000000000490.65230.66440.6717-0.0110999999999999990.73070.77650.71320.0125999999999999450.71110.70270.74580.0059000000000000160.750.72110.71310.71090.75230.7438
Percentage of EfficiencyRatio113.6121.6116.0118.8126.8120.8129.7119.1-329.4116.0113.3109.082.2107.2107.1107.9182.6106.0110.3108.8184.4119.3113.8108.4105.2108.2107.7

stpr:CA



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-31
Value0.44990.00390000000000001460.41640.39960.40850.43120.46940.48390.00390000000000001460.45590.43820.4535-0.0113999999999999660.48560.5530.47870.00080000000000002290.45280.46040.4682-0.0065000000000000060.46490.46640.46720.47040.505
Percentage of EfficiencyRatio79.533.680.880.580.481.588.285.9-229.481.174.773.684.471.376.372.511.667.572.368.3-203.173.973.671.069.672.7

stpr:MI



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-31
Value0.58910.0101999999999999870.53310.52040.53820.5490.59770.59610.00079999999999991190.57150.58140.5917-0.0059000000000000160.6410.64130.59310.0145000000000000680.57490.48210.6022-0.00139999999999995680.62910.58670.59710.59530.6088
Percentage of EfficiencyRatio104.187.9103.4104.8105.9103.7112.3105.8-47.1101.699.296.043.794.188.589.8210.185.775.787.8-43.7100.192.690.888.187.6

stpr:TX



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-31
Value0.58250.0123999999999999670.55570.52860.5460.58050.62170.65630.00260000000000004670.58740.64370.6478-0.0135999999999999450.67290.74910.65090.0113999999999999660.59540.5820.5743-0.00180000000000002380.57910.51670.53830.54990.511
Percentage of EfficiencyRatio103.0106.9107.8106.5107.5109.7116.8116.5-152.9104.4109.8105.1100.798.7103.498.5165.288.891.483.8-56.392.181.681.881.473.5

us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType

cma:FinancingReceivableRatioOfAllowanceForCreditLossesToAllLoans

us-gaap:FinanceReceivables



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312010-12-31
Value0.01710.01270.01270.01270.01290.01340.01350.01360.01420.01450.01450.01430.01470.01490.01480.01450.01470.01290.01270.01240.01220.01220.01240.01230.01280.01320.01370.01350.01370.01370.01460.01520.01640.0170.0224
Percentage of FinancingReceivableRatioOfAllowanceForCreditLossesToAllLoans100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType, us-gaap:FinancingReceivablePortfolioSegment

us-gaap:FinanceReceivables, us-gaap:CommercialPortfolioSegment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302013-12-31
Value0.01750.0130.0130.0130.01330.01370.01390.0140.01460.01480.01470.01470.01510.01530.01510.01480.0150.0130.01270.01240.01210.0120.01210.0128
Percentage of FinancingReceivableRatioOfAllowanceForCreditLossesToAllLoans102.3102.4102.4102.4103.1102.2103.0102.9102.8102.1101.4102.8102.7102.7102.0102.1102.0100.8100.0100.099.298.497.697.0

us-gaap:FinanceReceivables, us-gaap:ConsumerPortfolioSegment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302013-12-31
Value0.01350.00840.00860.00890.00880.00970.010.00960.00990.01120.01230.00980.01050.01080.0110.01070.01140.01260.01290.01270.01390.01430.01520.017
Percentage of FinancingReceivableRatioOfAllowanceForCreditLossesToAllLoans78.966.167.770.168.272.474.170.669.777.284.868.571.472.574.373.877.697.7101.6102.4113.9117.2122.6128.8

cma:FinancingReceivableRevolvingConvertedtoTerm



Period End2020-03-31
Value115
Percentage of FinancingReceivableRevolvingConvertedtoTerm100.0

us-gaap:ClassOfFinancingReceivableTypeOfBorrower, us-gaap:FinancingReceivablePortfolioSegment

us-gaap:CommercialBorrower, us-gaap:CommercialPortfolioSegment



Period End2020-03-31
Value16
Percentage of FinancingReceivableRevolvingConvertedtoTerm13.9

us-gaap:ConsumerBorrower, us-gaap:ConsumerPortfolioSegment



Period End2020-03-31
Value99
Percentage of FinancingReceivableRevolvingConvertedtoTerm86.1

us-gaap:ClassOfFinancingReceivableTypeOfBorrower, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable

us-gaap:ConsumerBorrower, us-gaap:ConsumerPortfolioSegment, cma:ConsumerFinancingReceivable



Period End2020-03-31
Value0.0
Percentage of FinancingReceivableRevolvingConvertedtoTerm0.0

us-gaap:ConsumerBorrower, us-gaap:ConsumerPortfolioSegment, us-gaap:HomeEquityLoan



Period End2020-03-31
Value99
Percentage of FinancingReceivableRevolvingConvertedtoTerm86.1

us-gaap:ClassOfFinancingReceivableTypeOfBorrower, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:GeographicDistribution

us-gaap:CommercialBorrower, us-gaap:CommercialPortfolioSegment, cma:LeaseFinancing, us-gaap:GeographicDistributionDomestic



Period End2020-03-31
Value0.0
Percentage of FinancingReceivableRevolvingConvertedtoTerm0.0

us-gaap:CommercialBorrower, us-gaap:CommercialPortfolioSegment, us-gaap:ConstructionLoans, us-gaap:GeographicDistributionDomestic



Period End2020-03-31
Value0.0
Percentage of FinancingReceivableRevolvingConvertedtoTerm0.0

us-gaap:CommercialBorrower, us-gaap:CommercialPortfolioSegment, us-gaap:RealEstateLoan, us-gaap:GeographicDistributionDomestic



Period End2020-03-31
Value0.0
Percentage of FinancingReceivableRevolvingConvertedtoTerm0.0

us-gaap:ClassOfFinancingReceivableTypeOfBorrower, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:GeographicDistribution, us-gaap:InternalCreditAssessment

us-gaap:CommercialBorrower, us-gaap:CommercialPortfolioSegment, cma:LeaseFinancing, us-gaap:GeographicDistributionDomestic, us-gaap:Doubtful



Period End2020-03-31
Value0.0
Percentage of FinancingReceivableRevolvingConvertedtoTerm0.0

us-gaap:CommercialBorrower, us-gaap:CommercialPortfolioSegment, cma:LeaseFinancing, us-gaap:GeographicDistributionDomestic, us-gaap:Pass



Period End2020-03-31
Value0.0
Percentage of FinancingReceivableRevolvingConvertedtoTerm0.0

us-gaap:CommercialBorrower, us-gaap:CommercialPortfolioSegment, cma:LeaseFinancing, us-gaap:GeographicDistributionDomestic, us-gaap:SpecialMention



Period End2020-03-31
Value0.0
Percentage of FinancingReceivableRevolvingConvertedtoTerm0.0

us-gaap:CommercialBorrower, us-gaap:CommercialPortfolioSegment, cma:LeaseFinancing, us-gaap:GeographicDistributionDomestic, us-gaap:Substandard



Period End2020-03-31
Value0.0
Percentage of FinancingReceivableRevolvingConvertedtoTerm0.0

us-gaap:CommercialBorrower, us-gaap:CommercialPortfolioSegment, us-gaap:ConstructionLoans, us-gaap:GeographicDistributionDomestic, us-gaap:Pass



Period End2020-03-31
Value0.0
Percentage of FinancingReceivableRevolvingConvertedtoTerm0.0

us-gaap:CommercialBorrower, us-gaap:CommercialPortfolioSegment, us-gaap:ConstructionLoans, us-gaap:GeographicDistributionDomestic, us-gaap:SpecialMention



Period End2020-03-31
Value0.0
Percentage of FinancingReceivableRevolvingConvertedtoTerm0.0

us-gaap:CommercialBorrower, us-gaap:CommercialPortfolioSegment, us-gaap:ConstructionLoans, us-gaap:GeographicDistributionDomestic, us-gaap:Substandard



Period End2020-03-31
Value0.0
Percentage of FinancingReceivableRevolvingConvertedtoTerm0.0

us-gaap:CommercialBorrower, us-gaap:CommercialPortfolioSegment, us-gaap:RealEstateLoan, us-gaap:GeographicDistributionDomestic, us-gaap:Doubtful



Period End2020-03-31
Value0.0
Percentage of FinancingReceivableRevolvingConvertedtoTerm0.0

us-gaap:CommercialBorrower, us-gaap:CommercialPortfolioSegment, us-gaap:RealEstateLoan, us-gaap:GeographicDistributionDomestic, us-gaap:Pass



Period End2020-03-31
Value0.0
Percentage of FinancingReceivableRevolvingConvertedtoTerm0.0

us-gaap:CommercialBorrower, us-gaap:CommercialPortfolioSegment, us-gaap:RealEstateLoan, us-gaap:GeographicDistributionDomestic, us-gaap:SpecialMention



Period End2020-03-31
Value0.0
Percentage of FinancingReceivableRevolvingConvertedtoTerm0.0

us-gaap:CommercialBorrower, us-gaap:CommercialPortfolioSegment, us-gaap:RealEstateLoan, us-gaap:GeographicDistributionDomestic, us-gaap:Substandard



Period End2020-03-31
Value0.0
Percentage of FinancingReceivableRevolvingConvertedtoTerm0.0

us-gaap:ClassOfFinancingReceivableTypeOfBorrower, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:InternalCreditAssessment

us-gaap:ConsumerBorrower, us-gaap:ConsumerPortfolioSegment, cma:ConsumerFinancingReceivable, us-gaap:Pass



Period End2020-03-31
Value0.0
Percentage of FinancingReceivableRevolvingConvertedtoTerm0.0

us-gaap:ConsumerBorrower, us-gaap:ConsumerPortfolioSegment, cma:ConsumerFinancingReceivable, us-gaap:SpecialMention



Period End2020-03-31
Value0.0
Percentage of FinancingReceivableRevolvingConvertedtoTerm0.0

us-gaap:ConsumerBorrower, us-gaap:ConsumerPortfolioSegment, cma:ConsumerFinancingReceivable, us-gaap:Substandard



Period End2020-03-31
Value0.0
Percentage of FinancingReceivableRevolvingConvertedtoTerm0.0

us-gaap:ConsumerBorrower, us-gaap:ConsumerPortfolioSegment, us-gaap:HomeEquityLoan, us-gaap:Doubtful



Period End2020-03-31
Value6
Percentage of FinancingReceivableRevolvingConvertedtoTerm5.2

us-gaap:ConsumerBorrower, us-gaap:ConsumerPortfolioSegment, us-gaap:HomeEquityLoan, us-gaap:Pass



Period End2020-03-31
Value90
Percentage of FinancingReceivableRevolvingConvertedtoTerm78.3

us-gaap:ConsumerBorrower, us-gaap:ConsumerPortfolioSegment, us-gaap:HomeEquityLoan, us-gaap:SpecialMention



Period End2020-03-31
Value0.0
Percentage of FinancingReceivableRevolvingConvertedtoTerm0.0

us-gaap:ConsumerBorrower, us-gaap:ConsumerPortfolioSegment, us-gaap:HomeEquityLoan, us-gaap:Substandard



Period End2020-03-31
Value3
Percentage of FinancingReceivableRevolvingConvertedtoTerm2.6

us-gaap:ClassOfFinancingReceivableTypeOfBorrower, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:GeographicDistribution

us-gaap:CommercialBorrower, us-gaap:CommercialPortfolioSegment, us-gaap:GeographicDistributionDomestic



Period End2020-03-31
Value16
Percentage of FinancingReceivableRevolvingConvertedtoTerm13.9

us-gaap:CommercialBorrower, us-gaap:CommercialPortfolioSegment, us-gaap:GeographicDistributionForeign



Period End2020-03-31
Value0.0
Percentage of FinancingReceivableRevolvingConvertedtoTerm0.0

us-gaap:ClassOfFinancingReceivableTypeOfBorrower, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:GeographicDistribution, us-gaap:InternalCreditAssessment

us-gaap:CommercialBorrower, us-gaap:CommercialPortfolioSegment, us-gaap:GeographicDistributionDomestic, us-gaap:Doubtful



Period End2020-03-31
Value2
Percentage of FinancingReceivableRevolvingConvertedtoTerm1.7

us-gaap:CommercialBorrower, us-gaap:CommercialPortfolioSegment, us-gaap:GeographicDistributionDomestic, us-gaap:Pass



Period End2020-03-31
Value13
Percentage of FinancingReceivableRevolvingConvertedtoTerm11.3

us-gaap:CommercialBorrower, us-gaap:CommercialPortfolioSegment, us-gaap:GeographicDistributionDomestic, us-gaap:SpecialMention



Period End2020-03-31
Value0.0
Percentage of FinancingReceivableRevolvingConvertedtoTerm0.0

us-gaap:CommercialBorrower, us-gaap:CommercialPortfolioSegment, us-gaap:GeographicDistributionDomestic, us-gaap:Substandard



Period End2020-03-31
Value1000000.0
Percentage of FinancingReceivableRevolvingConvertedtoTerm0.9

us-gaap:CommercialBorrower, us-gaap:CommercialPortfolioSegment, us-gaap:GeographicDistributionForeign, us-gaap:Pass



Period End2020-03-31
Value0.0
Percentage of FinancingReceivableRevolvingConvertedtoTerm0.0

us-gaap:CommercialBorrower, us-gaap:CommercialPortfolioSegment, us-gaap:GeographicDistributionForeign, us-gaap:SpecialMention



Period End2020-03-31
Value0.0
Percentage of FinancingReceivableRevolvingConvertedtoTerm0.0

us-gaap:CommercialBorrower, us-gaap:CommercialPortfolioSegment, us-gaap:GeographicDistributionForeign, us-gaap:Substandard



Period End2020-03-31
Value0.0
Percentage of FinancingReceivableRevolvingConvertedtoTerm0.0

us-gaap:FinancingReceivablePortfolioSegment

us-gaap:ConsumerPortfolioSegment



Period End2020-03-31
Value99
Percentage of FinancingReceivableRevolvingConvertedtoTerm86.1

us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable

us-gaap:ConsumerPortfolioSegment, us-gaap:ResidentialMortgage



Period End2020-03-31
Value0.0
Percentage of FinancingReceivableRevolvingConvertedtoTerm0.0

us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:InternalCreditAssessment

us-gaap:ConsumerPortfolioSegment, us-gaap:ResidentialMortgage, us-gaap:Doubtful



Period End2020-03-31
Value0.0
Percentage of FinancingReceivableRevolvingConvertedtoTerm0.0

us-gaap:ConsumerPortfolioSegment, us-gaap:ResidentialMortgage, us-gaap:Pass



Period End2020-03-31
Value0.0
Percentage of FinancingReceivableRevolvingConvertedtoTerm0.0

us-gaap:ConsumerPortfolioSegment, us-gaap:ResidentialMortgage, us-gaap:SpecialMention



Period End2020-03-31
Value0.0
Percentage of FinancingReceivableRevolvingConvertedtoTerm0.0

us-gaap:AdjustmentsForNewAccountingPronouncements

cma:Increaseinretailloansallowanceforcreditlosses

us-gaap:AccountingStandardsUpdate201613



Period End2020-01-012019-01-01
Value250
Percentage of Increaseinretailloansallowanceforcreditlosses100.00.0

us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis

cma:InterestBearingDepositLiabilitiesOtherTimeDeposit

us-gaap:FairValueInputsLevel2, us-gaap:EstimateOfFairValueFairValueDisclosure



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302013-12-31
Value26762268022617524369250732474024654248052460323667230862313324374246392451824585249252546225945257262567925841253932443424354
Percentage of InterestBearingDepositLiabilitiesOtherTimeDeposit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueByMeasurementBasis

us-gaap:CarryingReportedAmountFairValueDisclosure



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302012-12-31
Value26762268022617524369250732474024654248052460323667230862313324374246392451824585249252546225945257262567925841253932443424696243542383323381
Percentage of InterestBearingDepositLiabilitiesOtherTimeDeposit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.00.00.0

us-gaap:EstimateOfFairValueFairValueDisclosure



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302012-12-31
Value26762268022617524369250732474024654248052460323667230862313324374246392451824585249252546225945257262567925841253932443424696243542383323381
Percentage of InterestBearingDepositLiabilitiesOtherTimeDeposit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.00.00.0

cma:LeasesReceivableCommercialLeaseFinancingNetOfDeferredIncome



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-31
Value58458857857553550747145846446847547255057264868473172475178679280580582284984582984385385983785887290592794995810091053108411201139
Percentage of LeasesReceivableCommercialLeaseFinancingNetOfDeferredIncome100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cma:LoansAndLeasesReceivableConsumerLoansNetOfDeferredIncome



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-31
Value231524402451244324912514243624762514255425112535253725222541252424832485249124782422238223232261221722372152212421562153217422182238228523092232226223112403244324722511
Percentage of LoansAndLeasesReceivableConsumerLoansNetOfDeferredIncome100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cma:LoansAndLeasesReceivableConsumerMortgageNetOfDeferredIncome



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-31
Value182118451906192419491970194719542003198819991976194419421874185618741870188018651859183117971775175116971650161115681527149514691485152616431491155016191586160616311651
Percentage of LoansAndLeasesReceivableConsumerMortgageNetOfDeferredIncome100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cma:LoansAndLeasesReceivableForeignNetOfDeferredIncomeOther



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-31
Value103510091055102410401013109099396498311591145110612581303136514551368138214201433149614291352125013271286120912691293127712241256117010461162132611321182122613061252
Percentage of LoansAndLeasesReceivableForeignNetOfDeferredIncomeOther100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cma:LoansReceivableCommercialFinancialAndAgriculturalNetOfDeferredIncome



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-31
Value342493147332890333263200731976308893153030909310603106231449302153099431152323603156231659317773272332091315203075930986297742881527897291862850829513274602701625640249962311322052213602214521432211512075621690
Percentage of LoansReceivableCommercialFinancialAndAgriculturalNetOfDeferredIncome100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cma:LoansReceivableCommercialMortgageNetOfDeferredIncome



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-31
Value9698955992349217898991069019912492729159898589749021893190139038898289778787867485588604860387478801878787859007931794729559983010079102641053995799697976710180103181035810457
Percentage of LoansReceivableCommercialMortgageNetOfDeferredIncome100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cma:NetCreditRelatedChargeOffs



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-09-302011-06-302011-03-312011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-31
Value842142331115-32816251833361647585023188139122445268191101101564451319173869472
Percentage of NetCreditRelatedChargeOffs100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementBusinessSegments

cma:BusinessBank



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-09-302011-06-302011-03-312011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-31
Value83214335121401815281030321442573423229-1-291116281661267373424351251137712392
Percentage of NetCreditRelatedChargeOffs98.8100.0102.4106.1109.193.3-0.064.393.8112.055.690.988.987.589.498.368.0100.0122.2112.5-100.0-66.7100.091.766.762.261.966.072.375.277.878.779.281.983.1

cma:OtherMarkets



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-09-302011-06-302011-03-312011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-31
Value01-30-3-2-611046425-1-2180914-6-8-436262199595654147826
Percentage of NetCreditRelatedChargeOffs0.04.8-7.10.0-27.3-13.3200.039.30.016.033.312.15.631.2-2.1-3.436.00.050.012.5400.0-200.0-88.9-33.312.513.39.711.08.910.512.416.98.19.05.5

cma:RetailBank



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-09-302011-06-302011-03-312011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-31
Value101000-4122-1956312251104034812744623238866472611964
Percentage of NetCreditRelatedChargeOffs1.20.02.40.00.00.0133.342.912.5-4.050.015.216.718.82.13.450.04.35.60.0400.00.033.333.333.326.727.624.122.815.614.614.715.013.713.6

cma:WealthManagement



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-31
Value00-2-2-111-2-1-2-1-2-2-14-1-9-1-5-1-25-3-3055
Percentage of NetCreditRelatedChargeOffs0.00.0-4.8-6.1-9.16.7-33.3-7.1-6.2-8.0-5.6-6.1-5.6-6.28.5-1.7-18.0-4.3-27.8-12.5-200.0166.7-33.3-25.00.011.15.0

stpr:CA



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-31
Value11-157-350135108101017821061165101011
Percentage of NetCreditRelatedChargeOffs13.1-4.811.921.2-27.333.3-0.046.431.240.044.430.32.80.036.213.84.043.533.312.5100.0200.055.683.341.724.4

stpr:MI



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-31
Value3160480-112-1-33105-29-23-53100518
Percentage of NetCreditRelatedChargeOffs3.64.814.30.036.453.3-0.0-3.66.28.0-5.6-9.18.36.20.08.6-4.039.1-11.137.5-500.0100.0111.10.020.840.0

stpr:TX



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-31
Value70203426134351095223010314732453102667
Percentage of NetCreditRelatedChargeOffs83.395.281.078.8118.226.7-100.017.962.536.027.866.783.362.566.081.064.017.427.837.5100.00.022.250.025.015.6

cma:NotionalAmountOfDerivativeCreditRiskParticipationAgreements



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312011-12-31
Value807786744720674703631586540549544577510458514479523559653620629598527549583614661629594574394
Percentage of NotionalAmountOfDerivativeCreditRiskParticipationAgreements100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cma:OtherTimeDeposits



Period End2020-03-312019-12-312019-09-302019-06-302018-12-312012-09-302011-12-312011-09-30
Value0133647172600045
Percentage of OtherTimeDeposits0.0100.0100.0100.00.00.00.0100.0

us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis

us-gaap:FairValueInputsLevel2, us-gaap:EstimateOfFairValueFairValueDisclosure



Period End2020-03-312019-12-312019-09-302019-06-30
Value01336471727
Percentage of OtherTimeDeposits0.0100.0100.0100.1

us-gaap:FairValueByMeasurementBasis

us-gaap:CarryingReportedAmountFairValueDisclosure



Period End2020-03-312019-12-312019-09-302019-06-30
Value01336471726
Percentage of OtherTimeDeposits0.0100.0100.0100.0

us-gaap:EstimateOfFairValueFairValueDisclosure



Period End2020-03-312019-12-312019-09-302019-06-30
Value01336471727
Percentage of OtherTimeDeposits0.0100.0100.0100.1

cma:RealEstateConstructionLoansNetOfDeferredIncome



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-31
Value375634553377329232913077315832573114296130182857293028692743255322902001187417951917195519921939184717621552147913961240139213771442153316481728202322532444277432023461
Percentage of RealEstateConstructionLoansNetOfDeferredIncome100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AdjustmentsForNewAccountingPronouncements

cma:Reductioninbusinessloansallowanceforcreditlosses

us-gaap:AccountingStandardsUpdate201613



Period End2020-01-012019-01-01
Value-420
Percentage of Reductioninbusinessloansallowanceforcreditlosses100.00.0

cma:ReturnOnAverageAssets



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-312011-03-312010-12-312010-03-312009-12-312008-12-31
Value-0.0035-0.00070000000000000270.01610.01680.01970.01770.01850.0162-0.00140000000000000020.01250.01140.01140.00080000000000000040.00820.00590.0034-0.00039999999999999930.00760.00790.0078-0.000200000000000000520.00930.00930.00860.00840.00840.00770.00770.0050.00360.00030.0033
Percentage of ReturnOnAverageAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementBusinessSegments

cma:BusinessBank



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-312011-03-312010-12-312010-03-312009-12-312008-12-31
Value-0.00580.000100000000000002860.02170.02110.02530.02430.02340.0207-0.00019999999999999880.01940.01850.01870.0012999999999999990.01940.01550.00980.00029999999999999820.01980.01870.01959.99999999999994e-050.02240.02110.0220.02190.02490.02220.02220.01730.01130.00410.0057
Percentage of ReturnOnAverageAssets165.7-14.3134.8125.6128.4137.3126.5127.814.3155.2162.3164.0162.5236.6262.7288.2-75.0260.5236.7250.0-50.0240.9226.9255.8260.7296.4288.3346.0313.91366.7172.7

cma:OtherMarkets



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-312011-03-312010-12-312010-03-312009-12-312008-12-31
Value0.0124-0.00100000000000000090.03470.02760.03480.02750.02930.03320.00050000000000000040.02150.02240.0210.00.02230.02520.02870.00029999999999999820.02820.02050.0229-0.0018999999999999990.03070.03280.03280.02850.03770.0470.04740.02560.01630.01670.0029
Percentage of ReturnOnAverageAssets-354.3142.9215.5164.3176.6155.4158.4204.9-35.7172.0196.5184.20.0272.0427.1844.1-75.0371.1259.5293.6950.0330.1352.7381.4339.3448.8610.4512.0452.85566.787.9

cma:RetailBank



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-312011-03-312010-12-312010-03-312009-12-312008-12-31
Value0.0003-0.00070000000000000010.00390.00440.00540.00310.00520.00330.00020000000000000010.00330.00270.0017-0.00030.0001-0.00030.002-0.00079999999999999990.00230.0030.00290.000100000000000000050.00120.00290.00160.00180.0027-0.0005-0.0005-0.0018-0.0017-0.00270.0019
Percentage of ReturnOnAverageAssets-8.6100.024.226.227.417.528.120.4-14.326.423.714.9-37.51.2-5.158.8200.030.338.037.2-50.012.931.218.621.432.1-6.5-36.0-47.2-900.057.6

cma:WealthManagement



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-31
Value0.0169-0.00160000000000000070.03010.0310.02670.02280.0190.0230.0004999999999999970.01280.01760.01690.00080000000000000040.01390.01020.0179.99999999999994e-050.01620.02010.01290.00019999999999999880.00980.02020.02150.02120.00970.0114
Percentage of ReturnOnAverageAssets-482.9228.6187.0184.5135.5128.8102.7142.0-35.7102.4154.4148.2100.0169.5172.9500.0-25.0213.2254.4165.4-100.0105.4217.2250.0252.4115.5148.1

stpr:CA



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-31
Value0.01120.00059999999999999980.02370.02370.02320.02180.02060.0186-0.00039999999999999930.01320.01330.0130.00.01610.0110.01680.0008999999999999980.01270.01540.01620.00060000000000000160.01470.01540.01590.01450.0174
Percentage of ReturnOnAverageAssets-320.0-85.7147.2141.1117.8123.2111.4114.828.6105.6116.7114.00.0196.3186.4494.1-225.0167.1194.9207.7-300.0158.1165.6184.9172.6207.1

stpr:MI



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-31
Value0.0105-0.00079999999999999860.01780.02010.01740.01630.01370.0088-9.99999999999994e-050.01140.0120.01190.00029999999999999990.0090.01010.01270.00.01230.01730.0130.00029999999999999990.01190.01420.01260.01450.0153
Percentage of ReturnOnAverageAssets-300.0114.3110.6119.688.392.174.154.37.191.2105.3104.437.5109.8171.2373.5-0.0161.8219.0166.7-150.0128.0152.7146.5172.6182.1

stpr:TX



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-31
Value-0.0645-0.00069999999999999920.00480.00690.0230.02180.02080.01850.0004999999999999970.02050.01520.01340.00279999999999999950.01180.0011-0.0252-0.00250000000000000050.01160.00460.0101-0.00029999999999999990.0140.0130.0150.01530.0143
Percentage of ReturnOnAverageAssets1842.9100.029.841.1116.8123.2112.4114.2-35.7164.0133.3117.5350.0143.918.6-741.2625.0152.658.2129.5150.0150.5139.8174.4182.1170.2

cma:RiskParticipationsCoveringStandbyAndCommercialLettersOfCredit



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302012-12-31
Value160161164145126136136127123127208250239255282297319287295292317316308261250259307325
Percentage of RiskParticipationsCoveringStandbyAndCommercialLettersOfCredit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cma:SegmentReportingAverageAssets



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-09-302013-06-302013-03-312012-09-30
Value73265561717367125269771712107052070326-18712517131871819801729097066869228559713336896368739100266398648786470822963710-262826345162008
Percentage of SegmentReportingAverageAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementBusinessSegments

cma:BusinessBank



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-09-302013-06-302013-03-312012-09-30
Value4425444454594532143909431653996138911169389173885338091-92396183961738635-60392103913538794238377513730535896-16235697-2021163578034140
Percentage of SegmentReportingAverageAssets60.47.863.463.662.960.656.755.3-938.954.654.553.0-11.554.356.155.8-10.755.056.756.423.856.957.555.5-70.756.041.156.455.1

cma:Finance



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-09-302013-06-302013-03-312012-09-30
Value1428551143921424213911136961373513779-513996139361394438141441413514186167121771172112140291110231105511129-13111553-233391174711796
Percentage of SegmentReportingAverageAssets19.59.120.120.019.919.219.519.627.819.619.519.44.719.420.020.529.917.117.017.729.016.617.017.2-57.218.113.818.519.0

cma:FinanceOther



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-09-302013-06-302013-03-312012-09-30
Value21069515183741802117876203551888719615-159204632054621797878214641927918887578203771821618687730173761636417821362172611741271696017239
Percentage of SegmentReportingAverageAssets28.891.825.625.325.628.626.827.9883.328.728.830.3109.629.427.327.3103.428.626.427.272.926.225.227.5158.127.145.026.727.8

cma:Other1



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-09-302013-06-302013-03-312012-09-30
Value6784464398237793965666051525836-15464676610785384073205144470141182006495654743963535309669249357084078852135443
Percentage of SegmentReportingAverageAssets9.382.75.65.35.79.47.38.3855.69.19.310.9104.910.07.36.873.511.59.49.543.89.68.210.3215.39.031.28.28.8

cma:OtherMarkets



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-09-302013-06-302013-03-312012-09-30
Value97661809961941588529193907083625688168474825518932488068103-284628321766276769572816865-1537672-132-6378597791
Percentage of SegmentReportingAverageAssets13.332.113.913.212.712.912.911.9-311.112.411.911.52.212.812.511.7-0.411.912.111.17.611.611.210.6-66.812.0-22.312.412.6

cma:RetailBank



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-09-302013-06-302013-03-312012-09-30
Value286411287128392812262164126427-1164556487652536544655765442565186459622918627362226052759670-659736027
Percentage of SegmentReportingAverageAssets3.92.04.04.04.03.79.19.161.19.19.19.10.49.09.39.54.59.19.49.11.89.49.69.43.19.4-2.19.49.7

cma:WealthManagement



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-09-302013-06-302013-03-312012-09-30
Value5078-9503250715174506852605373-1754165432540612528352155162165228515350291649984987493922478524547384602
Percentage of SegmentReportingAverageAssets6.9-1.67.07.17.47.17.57.694.47.67.67.51.57.27.47.52.97.37.57.31.67.57.77.69.67.516.07.57.4

stpr:CA



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-09-302013-06-302013-03-312012-09-30
Value18377-144187261922819048183361869718581681817018446177993117933179971754114017060166961646112415768157211513315714067961811379512786
Percentage of SegmentReportingAverageAssets25.1-25.726.127.027.325.726.526.4-377.825.525.924.83.924.625.525.325.023.924.223.912.423.724.223.468.622.164.221.720.6

stpr:MI



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-09-302013-06-302013-03-312012-09-30
Value12899-1913213132391307513055134271339564133671337113413-29131741329913402-54138561385213736-48137241385113819-5713936-97-91404213968
Percentage of SegmentReportingAverageAssets17.6-3.418.418.618.718.319.019.0-355.618.818.718.7-3.618.118.819.4-9.719.420.120.0-4.820.721.321.4-24.921.9-3.222.122.5

stpr:TX



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-09-302013-06-302013-03-312012-09-30
Value1115429114621134910920102711043910373-47104351048110555-97110141128711295-103115781187812193120118351166111070-8010774-67461079510224
Percentage of SegmentReportingAverageAssets15.25.216.015.915.714.414.814.7261.114.614.714.7-12.115.116.016.3-18.416.217.217.712.017.818.017.1-34.916.916.317.016.5

cma:TotalInternallyClassifiedWatchListLettersOfCredit



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value5044454550497383778879103120135136146135110104104807910285926976122142144162207200195216233206243432
Percentage of TotalInternallyClassifiedWatchListLettersOfCredit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cma:WatchListLettersOfCreditAsPercentageOfTotalLettersOfCredit



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value0.0150.0130.0140.0140.0150.0150.02240.0250.0240.0270.0230.030.0340.0370.0360.0370.0340.0270.0260.0270.0210.020.0250.0210.0220.0160.0170.0250.0290.0290.0310.0380.0370.0360.040.0430.0380.0440.075
Percentage of WatchListLettersOfCreditAsPercentageOfTotalLettersOfCredit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312010-12-312009-12-31
Value312657343-48-138-280-251-209-101-20-19-33-3399131104970306837-146-8-68-21-31391502001621481291411
Percentage of AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value1893454403000000000218
Percentage of AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax100.0100.0100.0100.0100.00.00.00.00.00.00.00.00.00.0100.0100.0

us-gaap:AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312010-12-312009-12-31
Value-327-334-463-465-468-471-331-338-344-350-339-342-346-350-391426432-438415426438-449303310317-323-520-535-549-563-453-463-474-485-405-365
Percentage of AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AdditionalPaidInCapitalCommonStock



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-31
Value21682174217221682159214821442144213421222112211021062135217421652158217321652158218821882183217521822179217121602157216221532144215421702162147214641481147314671468740
Percentage of AdditionalPaidInCapitalCommonStock100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueByMeasurementBasis

us-gaap:AlternativeInvestment

us-gaap:CarryingReportedAmountFairValueDisclosure



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value55666666
Percentage of AlternativeInvestment100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EstimateOfFairValueFairValueDisclosure



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value101010101011119
Percentage of AlternativeInvestment200.0200.0166.7166.7166.7183.3183.3150.0

us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency

us-gaap:AssetsFairValueDisclosure

us-gaap:FairValueInputsLevel1, us-gaap:FairValueMeasurementsRecurring



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302010-12-31
Value2996294129372929289028582833283128372857290029242931294929953065304129891159959761750269295267270274226231213217176180204205301
Percentage of AssetsFairValueDisclosure100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302010-12-31
Value112329901100539874966595849428946194358302831182808142826884218415842483548478797583648218958997179660948697149933106581076811036104761043310339100127461
Percentage of AssetsFairValueDisclosure374.9336.7342.3337.1334.4335.3332.8334.2332.6290.6286.6283.2277.8280.4281.2274.6277.0279.5731.5831.61099.11095.73564.73293.93618.03513.33545.34395.14613.95055.45085.75952.35796.15068.14883.92478.7

us-gaap:FairValueInputsLevel3, us-gaap:FairValueMeasurementsNonrecurring



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302010-12-31
Value90702553423559811061161422842972833284093851561484366689897116135203201229242350444514640719901
Percentage of AssetsFairValueDisclosure3.02.40.91.81.51.22.12.93.74.14.99.710.19.611.013.312.75.212.84.58.79.136.432.943.450.074.188.999.1113.6161.3252.3285.6313.7350.7299.3

us-gaap:FairValueInputsLevel3, us-gaap:FairValueMeasurementsRecurring



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302010-12-31
Value4322282114948965666664688386838893100109140141146145162169175180183231243347436439619
Percentage of AssetsFairValueDisclosure1.40.71.00.70.50.30.10.30.32.32.32.32.22.32.82.82.72.98.010.414.318.752.449.554.360.061.777.477.985.9106.5138.1192.8213.7214.1205.6

us-gaap:FairValueByMeasurementFrequency

us-gaap:FairValueMeasurementsRecurring



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302010-12-31
Value14271128641301812824125691245112265123001228111224112771127011137112851149911566115481143197309034923491089999101581007299181015710334110691116411484108951096010979106568381
Percentage of AssetsFairValueDisclosure476.3437.4443.2437.8434.9435.7432.9434.5432.9392.9388.9385.4380.0382.7383.9377.4379.7382.4839.5942.01213.41214.43717.13443.43772.33673.33706.94572.64791.85241.35292.26190.36088.95381.95198.02784.4

us-gaap:AvailableForSaleSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-31
Value13041123981242912338122121204511862119151197110938109981094410830107871078910712106071051987498267821481169468953494879307948896311028610297105699940100611010497327537740675606816718873467416
Percentage of AvailableForSaleSecurities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302013-12-31
Value40811312611055366101323545756571772261907914711215212310792
Percentage of AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FinancialInstrument

us-gaap:MortgageBackedSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value2906674613622622
Percentage of AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax71.158.458.755.565.561.1100.095.7

us-gaap:USTreasuryAndGovernment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value118475249191400
Percentage of AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax28.941.641.344.534.538.90.00.0

us-gaap:AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302013-12-31
Value028315311821637133828614678781009997135120462442130199
Percentage of AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax0.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FinancialInstrument

us-gaap:MortgageBackedSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value0283153113197339128
Percentage of AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax0.0100.0100.0100.095.891.291.487.7

us-gaap:USTreasuryAndGovernment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value00005193216
Percentage of AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax0.00.00.00.04.28.88.611.0

us-gaap:AvailableForSaleSecuritiesAmortizedCost



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value126331231312334122811227512225122271224312244110611102210965108741082910621104931043010491862282018086803594919526950194149521963610067100601025596859828990195007415738975387398
Percentage of AvailableForSaleSecuritiesAmortizedCost100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FinancialInstrument

us-gaap:DebtSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value12633123131233412281122751222512227
Percentage of AvailableForSaleSecuritiesAmortizedCost100.0100.0100.0100.0100.0100.0100.0

us-gaap:MortgageBackedSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value98879568959095379533949394968230
Percentage of AvailableForSaleSecuritiesAmortizedCost78.377.777.877.777.777.777.774.4

us-gaap:USTreasuryAndGovernment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value27462745274427442742273227312743
Percentage of AvailableForSaleSecuritiesAmortizedCost21.722.322.222.322.322.322.324.8

us-gaap:FinancialInstrument, us-gaap:ManagingRisksInherentInServicingAssetsAndServicingLiabilitiesByTypeOfRisk

us-gaap:MortgageBackedSecurities, us-gaap:PrepaymentRisk



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value9900960095909537953394939496
Percentage of AvailableForSaleSecuritiesAmortizedCost78.478.077.877.777.777.777.7

us-gaap:AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302013-12-31
Value021275311520723518716712738283032161125513760417311912
Percentage of AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss0.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FinancialInstrument

us-gaap:MortgageBackedSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value0212753113188233125
Percentage of AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss0.0100.0100.0100.098.390.899.198.4

us-gaap:AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302013-12-31
Value028315311821637133828617594971211201814267941764476130199
Percentage of AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss0.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FinancialInstrument

us-gaap:MortgageBackedSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value0283153113197339157
Percentage of AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss0.0100.0100.0100.095.891.291.489.7

us-gaap:AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value110340035424465822588771067711177111841062460936092699967501870145121876930279340612943417150904473508960075334467541018022823970668115801633219421772315
Percentage of AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FinancialInstrument

us-gaap:MortgageBackedSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value1103400354244656747742086437848
Percentage of AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue100.0100.0100.0100.082.083.680.973.9

us-gaap:AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302013-12-31
Value0740391361511194856699188231284163311187
Percentage of AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss0.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FinancialInstrument

us-gaap:MortgageBackedSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value07400910632
Percentage of AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss0.0100.0100.00.00.0100.077.966.7

us-gaap:AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value11014941412271146810086132724373296572459749685825555560985188494471218496359241434911479758255167450323300045033712361263176317022269
Percentage of AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FinancialInstrument

us-gaap:MortgageBackedSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value11014941412271368100842803845
Percentage of AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue100.0100.0100.0100.025.1100.069.858.5

us-gaap:AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value01906213041946757786945453934385540521496112411741195126113661999198620812212230832473656356229218216717217718022823925634434337043147546
Percentage of AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue0.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FinancialInstrument

us-gaap:MortgageBackedSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value01906213041946379641243634003
Percentage of AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue0.0100.0100.0100.094.481.596.098.8

us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis

us-gaap:BankAcceptancesExecutedAndOutstanding

us-gaap:FairValueInputsLevel1, us-gaap:EstimateOfFairValueFairValueDisclosure



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302013-12-31
Value222444432223452445581010151011
Percentage of BankAcceptancesExecutedAndOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueByMeasurementBasis

us-gaap:CarryingReportedAmountFairValueDisclosure



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302012-12-31
Value22244443222345244558101015101211818
Percentage of BankAcceptancesExecutedAndOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.00.00.0

us-gaap:EstimateOfFairValueFairValueDisclosure



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302012-12-31
Value22244443222345244558101015101211818
Percentage of BankAcceptancesExecutedAndOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.00.00.0

us-gaap:CashAndDueFromBanks



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-31
Value84897312291029106313909451424117314381351137211761249129211729771157110111481170102610391226118611401384101687713959331076984982981987875668863816769774
Percentage of CashAndDueFromBanks100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis

us-gaap:FairValueInputsLevel1, us-gaap:EstimateOfFairValueFairValueDisclosure



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302013-12-31
Value848973122910291063139094514241173143813511372117612491292117297711571101114811701026103912261140
Percentage of CashAndDueFromBanks100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueByMeasurementBasis

us-gaap:CarryingReportedAmountFairValueDisclosure



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302012-12-31
Value848973122910291063139094514241173143813511372117612491292117297711571101114811701026103912261186114013841395
Percentage of CashAndDueFromBanks100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EstimateOfFairValueFairValueDisclosure



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302012-12-31
Value848973122910291063139094514241173143813511372117612491292117297711571101114811701026103912261186114013841395
Percentage of CashAndDueFromBanks100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CreditDerivativeMaximumExposureUndiscounted



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302012-12-31
Value50202621127200012239111051281075767811
Percentage of CreditDerivativeMaximumExposureUndiscounted100.0100.0100.0100.0100.0100.0100.00.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency

us-gaap:DeferredCompensationLiabilityCurrentAndNoncurrent

us-gaap:FairValueInputsLevel1, us-gaap:FairValueMeasurementsRecurring



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302010-12-31
Value929592899188949193928988898788878389899495949796979692929188888694908686
Percentage of DeferredCompensationLiabilityCurrentAndNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueByMeasurementFrequency

us-gaap:FairValueMeasurementsRecurring



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302010-12-31
Value929592899188949193928988898788878389899495949796979692929188888694908686
Percentage of DeferredCompensationLiabilityCurrentAndNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value334444444444445555
Percentage of DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:Deposits



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-31
Value573665729556809555375409155561560065721057635579035781956781588635898559261563745635159853587685826057570574865758154170537505329252909512555211752202499774938849306477554745241758418734047140631397803996639665
Percentage of Deposits100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis

us-gaap:FairValueInputsLevel2, us-gaap:EstimateOfFairValueFairValueDisclosure



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302013-12-31
Value57367572855679855524540665553055968571825760557880577865676158789589105924656365563405983758761582505756257476575695416353284
Percentage of Deposits100.0100.0100.0100.0100.099.999.9100.099.9100.099.9100.099.999.9100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueByMeasurementBasis

us-gaap:CarryingReportedAmountFairValueDisclosure



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302012-12-31
Value57366572955680955537540915556156006572105763557903578195678158863589855926156374563515985358768582605757057486575815417053750532925290952191
Percentage of Deposits100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EstimateOfFairValueFairValueDisclosure



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302012-12-31
Value57367572855679855524540665553055968571825760557880577865676158789589105924656365563405983758761582505756257476575695416353741532845290452195
Percentage of Deposits100.0100.0100.0100.0100.099.999.9100.099.9100.099.9100.099.999.9100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DepositsMoneyMarketDepositsAndNegotiableOrderOfWithdrawalNOW



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302011-12-312011-09-30
Value244752452723992221952288922560224492254422355215002086920952221772255622436225392287223532239482378623727239542352322555224852233221697216772154021284204072031120237
Percentage of DepositsMoneyMarketDepositsAndNegotiableOrderOfWithdrawalNOW100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DepositsSavingsDeposits



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-31
Value225821842156216221752172219222272233215221472158213820642052202220061898185318411817175217531731174216731645167716521606158916291586152417711462145713971363140714621342
Percentage of DepositsSavingsDeposits100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DerivativeAssetCollateralObligationToReturnCashOffset



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302012-12-31
Value4241110151181746651196843478512125629128220129026211112111
Percentage of DerivativeAssetCollateralObligationToReturnCashOffset100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DerivativeAssetFairValueGrossLiability



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-31
Value5563456065454248494949547184108128118127123116131133123158166187227221-252-279
Percentage of DerivativeAssetFairValueGrossLiability100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DerivativeAssets



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-31
Value61924330223914056219197123142120114101276427513479400480352501499286358312311194183268280
Percentage of DerivativeAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:BalanceSheetLocation, us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, cma:DerivativePurpose

us-gaap:DerivativeAverageFixedInterestRate

us-gaap:Loans, us-gaap:Swap, us-gaap:CashFlowHedging, cma:RiskManagementDerivatives



Period End2020-03-312019-12-312019-09-302019-06-30
Value0.01870.01940.02040.0223
Percentage of DerivativeAverageFixedInterestRate100.0100.0100.0100.0

us-gaap:LongTermDebt, us-gaap:InterestRateSwap, us-gaap:FairValueHedging, cma:RiskManagementDerivatives



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value0.03440.03440.03440.03650.034
Percentage of DerivativeAverageFixedInterestRate184.0177.3168.6163.70.0

us-gaap:BalanceSheetLocation, us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, cma:DerivativePurpose

us-gaap:DerivativeAverageVariableInterestRate

us-gaap:Loans, us-gaap:Swap, us-gaap:CashFlowHedging, cma:RiskManagementDerivatives



Period End2020-03-312019-12-312019-09-302019-06-30
Value0.01580.01710.02070.0244
Percentage of DerivativeAverageVariableInterestRate100.0100.0100.0100.0

us-gaap:LongTermDebt, us-gaap:InterestRateSwap, us-gaap:FairValueHedging, cma:RiskManagementDerivatives



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value0.02320.0280.03090.03460.0345
Percentage of DerivativeAverageVariableInterestRate146.8163.7149.3141.80.0

us-gaap:DerivativeCollateralObligationToReturnSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302012-12-31
Value00110110353410131932459013714112220323912186114138141180
Percentage of DerivativeCollateralObligationToReturnSecurities0.00.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DerivativeCollateralRightToReclaimSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302012-12-31
Value5421262010081011242416884143283120721528101256
Percentage of DerivativeCollateralRightToReclaimSecurities100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DerivativeCreditRiskValuationAdjustmentDerivativeAssets



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302011-12-31
Value22912732343465451111105545222222354-5-4
Percentage of DerivativeCreditRiskValuationAdjustmentDerivativeAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DerivativeFairValueOfDerivativeAsset



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value1098317448350223275267251177192188236215407620762853818885669922894420517479500563590676750811814749757815660686696664
Percentage of DerivativeFairValueOfDerivativeAsset100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-06-302013-03-312012-12-31
Value6192433012381405520919411813911610488257395468389263339230298260165272198173-78-82-11
Percentage of DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DerivativeFairValueOfDerivativeLiability



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value551141209171149269364326236190149183175254390489608610640469679661210286236249286314359408456463414403439363415400410
Percentage of DerivativeFairValueOfDerivativeLiability100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cma:DerivativePurpose

cma:CustomerInitiatedAndOtherActivitiesDerivatives



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302015-12-31
Value549139209170147266361322233186147179174248389610
Percentage of DerivativeFairValueOfDerivativeLiability99.698.6100.099.498.798.999.298.898.797.998.797.899.497.699.7100.0

cma:RiskManagementDerivatives



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302015-12-31
Value2201233434241610
Percentage of DerivativeFairValueOfDerivativeLiability0.41.40.00.61.31.10.81.21.32.11.32.20.62.40.30.0

us-gaap:DerivativeInstrumentRisk, cma:DerivativePurpose

cma:EnergyCapsAndFloorsPurchased, cma:CustomerInitiatedAndOtherActivitiesDerivatives



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value1000000.00.00.00.00.0
Percentage of DerivativeFairValueOfDerivativeLiability0.20.00.00.00.0

cma:EnergyCapsAndFloorsWritten, cma:CustomerInitiatedAndOtherActivitiesDerivatives



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value7623302426
Percentage of DerivativeFairValueOfDerivativeLiability13.816.314.414.09.7

cma:EnergySwaps, cma:CustomerInitiatedAndOtherActivitiesDerivatives



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value37769126101160
Percentage of DerivativeFairValueOfDerivativeLiability68.448.960.359.159.5

cma:ForeignExchangeSpotForwardsOptionsAndSwaps, cma:CustomerInitiatedAndOtherActivitiesDerivatives



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value25810912
Percentage of DerivativeFairValueOfDerivativeLiability4.55.74.85.34.5

cma:InterestRateCapsAndFloorsWritten, cma:CustomerInitiatedAndOtherActivitiesDerivatives



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value0.00.01000000.01000000.01000000.0
Percentage of DerivativeFairValueOfDerivativeLiability0.00.00.50.60.4

us-gaap:CommodityContract, cma:CustomerInitiatedAndOtherActivitiesDerivatives



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value45492156125186
Percentage of DerivativeFairValueOfDerivativeLiability82.465.274.673.169.1

us-gaap:InterestRateContract, cma:CustomerInitiatedAndOtherActivitiesDerivatives



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value7039433668
Percentage of DerivativeFairValueOfDerivativeLiability12.727.720.621.125.3

us-gaap:InterestRateSwap, cma:CustomerInitiatedAndOtherActivitiesDerivatives



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value7039423567
Percentage of DerivativeFairValueOfDerivativeLiability12.727.720.120.524.9

us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:HedgingDesignation, cma:DerivativePurpose

us-gaap:InterestRateSwap, us-gaap:FairValueHedging, us-gaap:DesignatedAsHedgingInstrument, cma:RiskManagementDerivatives



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value00002
Percentage of DerivativeFairValueOfDerivativeLiability0.00.00.00.00.7

us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency

us-gaap:CommodityContract, us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value454921561259318621991
Percentage of DerivativeFairValueOfDerivativeLiability82.465.274.673.162.469.160.247.9

us-gaap:ForeignExchangeContract, us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value271010109131440
Percentage of DerivativeFairValueOfDerivativeLiability4.97.14.85.86.04.83.821.1

us-gaap:InterestRateContract, us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value70394336477013159
Percentage of DerivativeFairValueOfDerivativeLiability12.727.720.621.131.526.036.031.1

us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByMeasurementFrequency

us-gaap:CommodityContract, us-gaap:FairValueMeasurementsRecurring



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value454921561259318621991
Percentage of DerivativeFairValueOfDerivativeLiability82.465.274.673.162.469.160.247.9

us-gaap:ForeignExchangeContract, us-gaap:FairValueMeasurementsRecurring



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value271010109131440
Percentage of DerivativeFairValueOfDerivativeLiability4.97.14.85.86.04.83.821.1

us-gaap:InterestRateContract, us-gaap:FairValueMeasurementsRecurring



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value70394336477013159
Percentage of DerivativeFairValueOfDerivativeLiability12.727.720.621.131.526.036.031.1

us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation, cma:DerivativePurpose

cma:ForeignExchangeSpotForwardAndSwaps, us-gaap:Nondesignated, cma:RiskManagementDerivatives



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value22011
Percentage of DerivativeFairValueOfDerivativeLiability0.41.40.00.60.4

us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency

us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value551141209171149269364190
Percentage of DerivativeFairValueOfDerivativeLiability100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueByMeasurementFrequency

us-gaap:FairValueMeasurementsRecurring



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value551141209171149269364190
Percentage of DerivativeFairValueOfDerivativeLiability100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-06-302013-03-312012-12-31
Value419451268256223141138114787010991117233312456477499350539526864145420-20
Percentage of DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.00.0

us-gaap:DerivativeLiabilities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-31
Value473661521026622314914812510294125991252743554844805113505465288793535239806073
Percentage of DerivativeLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DerivativeLiabilityCollateralRightToReclaimCashOffset



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302012-12-31
Value231212918117313062396454586636320035171080
Percentage of DerivativeLiabilityCollateralRightToReclaimCashOffset100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.0100.0100.0100.0100.00.0

us-gaap:DerivativeLiabilityFairValueGrossAsset



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-31
Value5563456065454248494949547184108128118127123116131133123158166187227221-252-279
Percentage of DerivativeLiabilityFairValueGrossAsset100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DerivativeNotionalAmount



Period End2020-03-312019-12-31
Value3473230134
Percentage of DerivativeNotionalAmount100.0100.0

cma:DerivativePurpose

cma:CustomerInitiatedAndOtherActivitiesDerivatives



Period End2020-03-312019-12-31
Value2549121929
Percentage of DerivativeNotionalAmount73.472.8

cma:RiskManagementDerivatives



Period End2020-03-312019-12-31
Value92418205
Percentage of DerivativeNotionalAmount26.627.2

us-gaap:BalanceSheetLocation, us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, cma:DerivativePurpose

us-gaap:Loans, us-gaap:Swap, us-gaap:CashFlowHedging, cma:RiskManagementDerivatives



Period End2020-03-312019-12-31
Value55504550
Percentage of DerivativeNotionalAmount16.015.1

us-gaap:DerivativeInstrumentRisk, cma:DerivativePurpose

cma:EnergyCapsAndFloorsPurchased, cma:CustomerInitiatedAndOtherActivitiesDerivatives



Period End2020-03-312019-12-31
Value439477
Percentage of DerivativeNotionalAmount1.31.6

cma:EnergyCapsAndFloorsWritten, cma:CustomerInitiatedAndOtherActivitiesDerivatives



Period End2020-03-312019-12-31
Value439477
Percentage of DerivativeNotionalAmount1.31.6

cma:EnergySwaps, cma:CustomerInitiatedAndOtherActivitiesDerivatives



Period End2020-03-312019-12-31
Value19662135
Percentage of DerivativeNotionalAmount5.77.1

cma:ForeignExchangeSpotForwardsOptionsAndSwaps, cma:CustomerInitiatedAndOtherActivitiesDerivatives



Period End2020-03-312019-12-31
Value15311013
Percentage of DerivativeNotionalAmount4.43.4

cma:InterestRateCapsAndFloorsPurchased, cma:CustomerInitiatedAndOtherActivitiesDerivatives



Period End2020-03-312019-12-31
Value681671
Percentage of DerivativeNotionalAmount2.02.2

cma:InterestRateCapsAndFloorsWritten, cma:CustomerInitiatedAndOtherActivitiesDerivatives



Period End2020-03-312019-12-31
Value681671
Percentage of DerivativeNotionalAmount2.02.2

us-gaap:CommodityContract, cma:CustomerInitiatedAndOtherActivitiesDerivatives



Period End2020-03-312019-12-31
Value28443089
Percentage of DerivativeNotionalAmount8.210.3

us-gaap:InterestRateContract, cma:CustomerInitiatedAndOtherActivitiesDerivatives



Period End2020-03-312019-12-31
Value2111617827
Percentage of DerivativeNotionalAmount60.859.2

us-gaap:InterestRateSwap, cma:CustomerInitiatedAndOtherActivitiesDerivatives



Period End2020-03-312019-12-31
Value1975416485
Percentage of DerivativeNotionalAmount56.954.7

us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:HedgingDesignation, cma:DerivativePurpose

us-gaap:InterestRateSwap, us-gaap:CashFlowHedging, us-gaap:DesignatedAsHedgingInstrument, cma:RiskManagementDerivatives



Period End2020-03-312019-12-31
Value55503325
Percentage of DerivativeNotionalAmount16.011.0

us-gaap:InterestRateSwap, us-gaap:FairValueHedging, us-gaap:DesignatedAsHedgingInstrument, cma:RiskManagementDerivatives



Period End2020-03-312019-12-31
Value33254550
Percentage of DerivativeNotionalAmount9.615.1

us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation, cma:DerivativePurpose

cma:ForeignExchangeSpotForwardAndSwaps, us-gaap:Nondesignated, cma:RiskManagementDerivatives



Period End2020-03-312019-12-31
Value366330
Percentage of DerivativeNotionalAmount1.11.1

us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis

us-gaap:DueFromCustomerAcceptances

us-gaap:FairValueInputsLevel1, us-gaap:EstimateOfFairValueFairValueDisclosure



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302013-12-31
Value222444432223452445581010151011
Percentage of DueFromCustomerAcceptances100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueByMeasurementBasis

us-gaap:CarryingReportedAmountFairValueDisclosure



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302012-12-31
Value22244443222345244558101015101211818
Percentage of DueFromCustomerAcceptances100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.00.00.0

us-gaap:EstimateOfFairValueFairValueDisclosure



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302012-12-31
Value22244443222345244558101015101211818
Percentage of DueFromCustomerAcceptances100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.00.00.0

us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument

us-gaap:EquitySecuritiesFvNi

us-gaap:FairValueInputsLevel1, us-gaap:FairValueMeasurementsRecurring, us-gaap:EquitySecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value40544947434340
Percentage of EquitySecuritiesFvNi100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument

us-gaap:FairValueMeasurementsRecurring, us-gaap:EquitySecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value40544947434340
Percentage of EquitySecuritiesFvNi100.0100.0100.0100.0100.0100.0100.0

us-gaap:DerivativeInstrumentRisk

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue

us-gaap:InterestRateContract



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302014-12-31
Value43222821149267141413111127272091120
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0

us-gaap:FederalHomeLoanBankAdvancesLongTerm



Period End2020-03-31
Value3800
Percentage of FederalHomeLoanBankAdvancesLongTerm100.0

us-gaap:ConsolidatedEntities

srt:Subsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value38003800380038003800380038002800
Percentage of FederalHomeLoanBankAdvancesLongTerm100.00.00.00.00.00.00.00.0

us-gaap:ConsolidatedEntities, us-gaap:DebtInstrument

srt:Subsidiaries, cma:FloatingratebasedonFHLBauctionratedue2028



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-03-312017-12-31
Value100010001000100010001000100010000
Percentage of FederalHomeLoanBankAdvancesLongTerm26.30.00.00.00.00.00.00.00.0

us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis

us-gaap:FederalHomeLoanBankStockAndFederalReserveBankStock

us-gaap:FairValueInputsLevel1, us-gaap:EstimateOfFairValueFairValueDisclosure



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302013-12-31
Value27924824829726424824824824820722822820720720720711392929292929292133
Percentage of FederalHomeLoanBankStockAndFederalReserveBankStock100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueByMeasurementBasis

us-gaap:CarryingReportedAmountFairValueDisclosure



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302012-12-31
Value27924824829726424824824824820722822820720720720711392929292929292133133133174
Percentage of FederalHomeLoanBankStockAndFederalReserveBankStock100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.00.00.0

us-gaap:EstimateOfFairValueFairValueDisclosure



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302012-12-31
Value27924824829726424824824824820722822820720720720711392929292929292133133133174
Percentage of FederalHomeLoanBankStockAndFederalReserveBankStock100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.00.00.0

us-gaap:FinancialInstrumentsOwnedAndPledgedAsCollateralAtFairValue



Period End2020-03-31
Value5500
Percentage of FinancialInstrumentsOwnedAndPledgedAsCollateralAtFairValue100.0

us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType

us-gaap:FinancingReceivableAllowanceForCreditLosses

us-gaap:FinanceReceivables



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312010-12-312009-12-31
Value916637652657647671664677698712712705708730727729724634622618601594592591594598604613617629647667704726901985
Percentage of FinancingReceivableAllowanceForCreditLosses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType, us-gaap:FinancingReceivablePortfolioSegment

us-gaap:FinanceReceivables, us-gaap:CommercialPortfolioSegment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302013-12-312012-12-31
Value861601615618608627620635653661657661661682678682674579566563541534529528531552
Percentage of FinancingReceivableAllowanceForCreditLosses94.094.394.394.194.093.493.493.893.692.892.393.893.493.493.393.693.191.391.091.190.089.989.489.388.887.8

us-gaap:FinanceReceivables, us-gaap:ConsumerPortfolioSegment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302013-12-312012-12-31
Value5536373939444442455155444748494750555655606063636777
Percentage of FinancingReceivableAllowanceForCreditLosses6.05.75.75.96.06.66.66.26.47.27.76.26.66.66.76.46.98.79.08.910.010.110.610.711.212.2

us-gaap:InvestmentType

us-gaap:LoanOriginationCommitments



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312010-12-312009-12-31
Value623129313030333440424148464145434645485039414342373634363632353625263537
Percentage of FinancingReceivableAllowanceForCreditLosses6.84.94.44.74.64.55.05.05.75.95.86.86.55.66.25.96.47.17.78.16.56.97.37.16.26.05.65.95.85.15.45.43.63.63.93.8

us-gaap:ClassOfFinancingReceivableTypeOfBorrower, us-gaap:EquitySecuritiesByIndustry, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:GeographicDistribution, us-gaap:LoanRestructuringModification

us-gaap:FinancingReceivableModificationsRecordedInvestment

us-gaap:CommercialBorrower, us-gaap:CommercialAndIndustrialSector, us-gaap:CommercialPortfolioSegment, us-gaap:RealEstateLoan, us-gaap:GeographicDistributionDomestic, us-gaap:PaymentDeferral



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-30
Value2022322377954736710
Percentage of FinancingReceivableModificationsRecordedInvestment100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsumerBorrower, us-gaap:RealEstateSector, us-gaap:ConsumerPortfolioSegment, us-gaap:HomeEquityLoan, us-gaap:GeographicDistributionDomestic, us-gaap:PaymentDeferral



Period End2020-03-312019-09-302019-03-312018-09-30
Value0.00.01000000.01000000.0
Percentage of FinancingReceivableModificationsRecordedInvestment0.00.050.033.3

us-gaap:ClassOfFinancingReceivableTypeOfBorrower, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:GeographicDistribution, us-gaap:LoanRestructuringModification

us-gaap:CommercialBorrower, us-gaap:CommercialPortfolioSegment, us-gaap:GeographicDistributionDomestic, us-gaap:PaymentDeferral



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-30
Value331912265997907712714114114022923328116010810202213
Percentage of FinancingReceivableModificationsRecordedInvestment1650.00.0600.01300.01966.74850.04500.02566.71814.32014.31566.72800.05725.03328.69366.72666.71542.9100.00.00.00.0

us-gaap:ClassOfFinancingReceivableTypeOfBorrower, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:LoanRestructuringModification

us-gaap:CommercialBorrower, us-gaap:CommercialPortfolioSegment, us-gaap:PaymentDeferral



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-30
Value351914286313612911717314915014523324529317612621292828
Percentage of FinancingReceivableModificationsRecordedInvestment1750.00.0700.01400.02100.06800.06450.03900.02471.42128.61666.72900.05825.03500.09766.72933.31800.0210.00.00.00.0

us-gaap:LoanRestructuringModification

us-gaap:ContractualInterestRateReduction



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-30
Value113432172314444222333
Percentage of FinancingReceivableModificationsRecordedInvestment50.00.0150.0200.0100.0100.0850.028.642.911.180.0100.057.1133.333.328.620.00.00.00.0

us-gaap:PaymentDeferral



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-30
Value351915296413713111817415115214723424729417714523313132
Percentage of FinancingReceivableModificationsRecordedInvestment1750.00.0750.01450.02133.36850.06550.03933.32485.72157.11688.92940.05850.03528.69800.02950.02071.4230.00.00.00.0

us-gaap:FinancingReceivableNonaccrualNoAllowance



Period End2020-03-312019-12-31
Value7269
Percentage of FinancingReceivableNonaccrualNoAllowance100.0100.0

us-gaap:ClassOfFinancingReceivableTypeOfBorrower, us-gaap:EquitySecuritiesByIndustry, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:GeographicDistribution

us-gaap:CommercialBorrower, us-gaap:CommercialAndIndustrialSector, us-gaap:CommercialPortfolioSegment, us-gaap:RealEstateLoan, us-gaap:GeographicDistributionDomestic



Period End2020-03-312019-12-31
Value31
Percentage of FinancingReceivableNonaccrualNoAllowance4.21.4

us-gaap:ClassOfFinancingReceivableTypeOfBorrower, us-gaap:FinancingReceivablePortfolioSegment

us-gaap:CommercialBorrower, us-gaap:CommercialPortfolioSegment



Period End2020-03-312019-12-31
Value3032
Percentage of FinancingReceivableNonaccrualNoAllowance41.746.4

us-gaap:ClassOfFinancingReceivableTypeOfBorrower, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable

us-gaap:ConsumerBorrower, us-gaap:ConsumerPortfolioSegment, us-gaap:HomeEquityLoan



Period End2020-03-312019-12-31
Value2217
Percentage of FinancingReceivableNonaccrualNoAllowance30.624.6

us-gaap:ClassOfFinancingReceivableTypeOfBorrower, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:GeographicDistribution

us-gaap:CommercialBorrower, us-gaap:CommercialPortfolioSegment, us-gaap:RealEstateLoan, us-gaap:GeographicDistributionDomestic



Period End2020-03-312019-12-31
Value53
Percentage of FinancingReceivableNonaccrualNoAllowance6.94.3

us-gaap:ClassOfFinancingReceivableTypeOfBorrower, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:GeographicDistribution

us-gaap:CommercialBorrower, us-gaap:CommercialPortfolioSegment, us-gaap:GeographicDistributionDomestic



Period End2020-03-312019-12-31
Value2529
Percentage of FinancingReceivableNonaccrualNoAllowance34.742.0

us-gaap:ClassOfFinancingReceivableTypeOfBorrower, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:GeographicDistribution, cma:LoanClassification

us-gaap:CommercialBorrower, us-gaap:FinanceLeasesPortfolioSegment, us-gaap:GeographicDistributionDomestic, cma:BusinessLoans



Period End2020-03-31
Value0.0
Percentage of FinancingReceivableNonaccrualNoAllowance0.0

us-gaap:FinancingReceivablePortfolioSegment

us-gaap:ConsumerPortfolioSegment



Period End2020-03-312019-12-31
Value4237
Percentage of FinancingReceivableNonaccrualNoAllowance58.353.6

us-gaap:FinancingReceivableOriginatedFiveOrMoreYearsBeforeLatestFiscalYear



Period End2020-03-31
Value5753
Percentage of FinancingReceivableOriginatedFiveOrMoreYearsBeforeLatestFiscalYear100.0

us-gaap:ClassOfFinancingReceivableTypeOfBorrower, us-gaap:FinancingReceivablePortfolioSegment

us-gaap:CommercialBorrower, us-gaap:CommercialPortfolioSegment



Period End2020-03-31
Value5045
Percentage of FinancingReceivableOriginatedFiveOrMoreYearsBeforeLatestFiscalYear87.7

us-gaap:ConsumerBorrower, us-gaap:ConsumerPortfolioSegment



Period End2020-03-31
Value86
Percentage of FinancingReceivableOriginatedFiveOrMoreYearsBeforeLatestFiscalYear1.5

us-gaap:ClassOfFinancingReceivableTypeOfBorrower, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable

us-gaap:ConsumerBorrower, us-gaap:ConsumerPortfolioSegment, cma:ConsumerFinancingReceivable



Period End2020-03-31
Value64
Percentage of FinancingReceivableOriginatedFiveOrMoreYearsBeforeLatestFiscalYear1.1

us-gaap:ConsumerBorrower, us-gaap:ConsumerPortfolioSegment, us-gaap:HomeEquityLoan



Period End2020-03-31
Value22
Percentage of FinancingReceivableOriginatedFiveOrMoreYearsBeforeLatestFiscalYear0.4

us-gaap:ClassOfFinancingReceivableTypeOfBorrower, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:GeographicDistribution

us-gaap:CommercialBorrower, us-gaap:CommercialPortfolioSegment, cma:LeaseFinancing, us-gaap:GeographicDistributionDomestic



Period End2020-03-31
Value219
Percentage of FinancingReceivableOriginatedFiveOrMoreYearsBeforeLatestFiscalYear3.8

us-gaap:CommercialBorrower, us-gaap:CommercialPortfolioSegment, us-gaap:ConstructionLoans, us-gaap:GeographicDistributionDomestic



Period End2020-03-31
Value220
Percentage of FinancingReceivableOriginatedFiveOrMoreYearsBeforeLatestFiscalYear3.8

us-gaap:CommercialBorrower, us-gaap:CommercialPortfolioSegment, us-gaap:RealEstateLoan, us-gaap:GeographicDistributionDomestic



Period End2020-03-31
Value3255
Percentage of FinancingReceivableOriginatedFiveOrMoreYearsBeforeLatestFiscalYear56.6

us-gaap:ClassOfFinancingReceivableTypeOfBorrower, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:GeographicDistribution, us-gaap:InternalCreditAssessment

us-gaap:CommercialBorrower, us-gaap:CommercialPortfolioSegment, cma:LeaseFinancing, us-gaap:GeographicDistributionDomestic, us-gaap:Doubtful



Period End2020-03-31
Value0.0
Percentage of FinancingReceivableOriginatedFiveOrMoreYearsBeforeLatestFiscalYear0.0

us-gaap:CommercialBorrower, us-gaap:CommercialPortfolioSegment, cma:LeaseFinancing, us-gaap:GeographicDistributionDomestic, us-gaap:Pass



Period End2020-03-31
Value219
Percentage of FinancingReceivableOriginatedFiveOrMoreYearsBeforeLatestFiscalYear3.8

us-gaap:CommercialBorrower, us-gaap:CommercialPortfolioSegment, cma:LeaseFinancing, us-gaap:GeographicDistributionDomestic, us-gaap:SpecialMention



Period End2020-03-31
Value0.0
Percentage of FinancingReceivableOriginatedFiveOrMoreYearsBeforeLatestFiscalYear0.0

us-gaap:CommercialBorrower, us-gaap:CommercialPortfolioSegment, cma:LeaseFinancing, us-gaap:GeographicDistributionDomestic, us-gaap:Substandard



Period End2020-03-31
Value0.0
Percentage of FinancingReceivableOriginatedFiveOrMoreYearsBeforeLatestFiscalYear0.0

us-gaap:CommercialBorrower, us-gaap:CommercialPortfolioSegment, us-gaap:ConstructionLoans, us-gaap:GeographicDistributionDomestic, us-gaap:Pass



Period End2020-03-31
Value220
Percentage of FinancingReceivableOriginatedFiveOrMoreYearsBeforeLatestFiscalYear3.8

us-gaap:CommercialBorrower, us-gaap:CommercialPortfolioSegment, us-gaap:ConstructionLoans, us-gaap:GeographicDistributionDomestic, us-gaap:SpecialMention



Period End2020-03-31
Value0.0
Percentage of FinancingReceivableOriginatedFiveOrMoreYearsBeforeLatestFiscalYear0.0

us-gaap:CommercialBorrower, us-gaap:CommercialPortfolioSegment, us-gaap:ConstructionLoans, us-gaap:GeographicDistributionDomestic, us-gaap:Substandard



Period End2020-03-31
Value0.0
Percentage of FinancingReceivableOriginatedFiveOrMoreYearsBeforeLatestFiscalYear0.0

us-gaap:CommercialBorrower, us-gaap:CommercialPortfolioSegment, us-gaap:RealEstateLoan, us-gaap:GeographicDistributionDomestic, us-gaap:Doubtful



Period End2020-03-31
Value13
Percentage of FinancingReceivableOriginatedFiveOrMoreYearsBeforeLatestFiscalYear0.2

us-gaap:CommercialBorrower, us-gaap:CommercialPortfolioSegment, us-gaap:RealEstateLoan, us-gaap:GeographicDistributionDomestic, us-gaap:Pass



Period End2020-03-31
Value3114
Percentage of FinancingReceivableOriginatedFiveOrMoreYearsBeforeLatestFiscalYear54.1

us-gaap:CommercialBorrower, us-gaap:CommercialPortfolioSegment, us-gaap:RealEstateLoan, us-gaap:GeographicDistributionDomestic, us-gaap:SpecialMention



Period End2020-03-31
Value50
Percentage of FinancingReceivableOriginatedFiveOrMoreYearsBeforeLatestFiscalYear0.9

us-gaap:CommercialBorrower, us-gaap:CommercialPortfolioSegment, us-gaap:RealEstateLoan, us-gaap:GeographicDistributionDomestic, us-gaap:Substandard



Period End2020-03-31
Value78
Percentage of FinancingReceivableOriginatedFiveOrMoreYearsBeforeLatestFiscalYear1.4

us-gaap:ClassOfFinancingReceivableTypeOfBorrower, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:InternalCreditAssessment

us-gaap:ConsumerBorrower, us-gaap:ConsumerPortfolioSegment, cma:ConsumerFinancingReceivable, us-gaap:Pass



Period End2020-03-31
Value64
Percentage of FinancingReceivableOriginatedFiveOrMoreYearsBeforeLatestFiscalYear1.1

us-gaap:ConsumerBorrower, us-gaap:ConsumerPortfolioSegment, cma:ConsumerFinancingReceivable, us-gaap:SpecialMention



Period End2020-03-31
Value0.0
Percentage of FinancingReceivableOriginatedFiveOrMoreYearsBeforeLatestFiscalYear0.0

us-gaap:ConsumerBorrower, us-gaap:ConsumerPortfolioSegment, cma:ConsumerFinancingReceivable, us-gaap:Substandard



Period End2020-03-31
Value0.0
Percentage of FinancingReceivableOriginatedFiveOrMoreYearsBeforeLatestFiscalYear0.0

us-gaap:ConsumerBorrower, us-gaap:ConsumerPortfolioSegment, us-gaap:HomeEquityLoan, us-gaap:Doubtful



Period End2020-03-31
Value1000000.0
Percentage of FinancingReceivableOriginatedFiveOrMoreYearsBeforeLatestFiscalYear0.0

us-gaap:ConsumerBorrower, us-gaap:ConsumerPortfolioSegment, us-gaap:HomeEquityLoan, us-gaap:Pass



Period End2020-03-31
Value21
Percentage of FinancingReceivableOriginatedFiveOrMoreYearsBeforeLatestFiscalYear0.4

us-gaap:ConsumerBorrower, us-gaap:ConsumerPortfolioSegment, us-gaap:HomeEquityLoan, us-gaap:SpecialMention



Period End2020-03-31
Value0.0
Percentage of FinancingReceivableOriginatedFiveOrMoreYearsBeforeLatestFiscalYear0.0

us-gaap:ConsumerBorrower, us-gaap:ConsumerPortfolioSegment, us-gaap:HomeEquityLoan, us-gaap:Substandard



Period End2020-03-31
Value0.0
Percentage of FinancingReceivableOriginatedFiveOrMoreYearsBeforeLatestFiscalYear0.0

us-gaap:ClassOfFinancingReceivableTypeOfBorrower, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:GeographicDistribution

us-gaap:CommercialBorrower, us-gaap:CommercialPortfolioSegment, us-gaap:GeographicDistributionDomestic



Period End2020-03-31
Value1275
Percentage of FinancingReceivableOriginatedFiveOrMoreYearsBeforeLatestFiscalYear22.2

us-gaap:CommercialBorrower, us-gaap:CommercialPortfolioSegment, us-gaap:GeographicDistributionForeign



Period End2020-03-31
Value76
Percentage of FinancingReceivableOriginatedFiveOrMoreYearsBeforeLatestFiscalYear1.3

us-gaap:ClassOfFinancingReceivableTypeOfBorrower, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:GeographicDistribution, us-gaap:InternalCreditAssessment

us-gaap:CommercialBorrower, us-gaap:CommercialPortfolioSegment, us-gaap:GeographicDistributionDomestic, us-gaap:Doubtful



Period End2020-03-31
Value53
Percentage of FinancingReceivableOriginatedFiveOrMoreYearsBeforeLatestFiscalYear0.9

us-gaap:CommercialBorrower, us-gaap:CommercialPortfolioSegment, us-gaap:GeographicDistributionDomestic, us-gaap:Pass



Period End2020-03-31
Value1143
Percentage of FinancingReceivableOriginatedFiveOrMoreYearsBeforeLatestFiscalYear19.9

us-gaap:CommercialBorrower, us-gaap:CommercialPortfolioSegment, us-gaap:GeographicDistributionDomestic, us-gaap:SpecialMention



Period End2020-03-31
Value47
Percentage of FinancingReceivableOriginatedFiveOrMoreYearsBeforeLatestFiscalYear0.8

us-gaap:CommercialBorrower, us-gaap:CommercialPortfolioSegment, us-gaap:GeographicDistributionDomestic, us-gaap:Substandard