ZION


Line plots across dimensions of each concept
Tables

Table of contents



us-gaap:CommonStockSharesIssued

us-gaap:CommonStockSharesOutstanding
us-gaap:StatementEquityComponents

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic

us-gaap:EarningsPerShareBasic

us-gaap:EarningsPerShareDiluted
dei:LegalEntity
us-gaap:Revenues
us-gaap:ConsolidationItems
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
us-gaap:StatementBusinessSegments

us-gaap:InterestAndFeeIncomeLoansAndLeases

us-gaap:GainLossOnInvestments

us-gaap:InterestExpense

us-gaap:InterestExpenseDebt

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic
dei:LegalEntity
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
us-gaap:StatementBusinessSegments

us-gaap:IncomeTaxExpenseBenefit
us-gaap:DerivativeInstrumentRisk, us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents

us-gaap:IncomeTaxesPaidNet

us-gaap:ProfitLoss
us-gaap:StatementEquityComponents

us-gaap:ComprehensiveIncomeNetOfTax

us-gaap:OtherComprehensiveIncomeLossNetOfTax
us-gaap:RetirementPlanType
us-gaap:StatementEquityComponents

us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic

us-gaap:NetIncomeLossAvailableToCommonStockholdersDiluted

us-gaap:Assets

us-gaap:Liabilities

us-gaap:LiabilitiesAndStockholdersEquity

us-gaap:StockholdersEquity
us-gaap:StatementEquityComponents

us-gaap:PropertyPlantAndEquipmentNet

us-gaap:IntangibleAssetsNetIncludingGoodwill

us-gaap:DeferredTaxAssetsLiabilitiesNet

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

us-gaap:StockholdersEquity
us-gaap:StatementEquityComponents

us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital
us-gaap:StatementEquityComponents

us-gaap:RetainedEarningsAccumulatedDeficit

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax
us-gaap:RetirementPlanType
us-gaap:StatementEquityComponents

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:ProfitLoss
us-gaap:StatementEquityComponents

us-gaap:DeferredIncomeTaxExpenseBenefit

us-gaap:ShareBasedCompensation

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:PaymentsToAcquirePropertyPlantAndEquipment

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:PaymentsOfDividends

us-gaap:PaymentsOfDividends

us-gaap:PaymentsForRepurchaseOfCommonStock

us-gaap:DebtInstrumentInterestRateStatedPercentage
us-gaap:DebtInstrument, us-gaap:LongtermDebtType

us-gaap:EffectiveIncomeTaxRateContinuingOperations

us-gaap:OperatingLeaseRightOfUseAsset

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents

us-gaap:ProceedsFromRepaymentsOfShortTermDebt

us-gaap:AdvertisingExpense

us-gaap:AllowanceForLoanAndLeaseLossRecoveryOfBadDebts
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable

us-gaap:AllowanceForLoanAndLeaseLossesAdjustmentsNet
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable

us-gaap:AllowanceForLoanAndLeaseLossesWriteOffs
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecurities
us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect

us-gaap:CommonStockDividendsPerShareDeclared

us-gaap:DebtAndEquitySecuritiesGainLoss

us-gaap:DefinedBenefitPlanAmortizationOfGainsLosses
us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanExpectedReturnOnPlanAssets
us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanInterestCost
us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost
us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1
us-gaap:RetirementPlanType

us-gaap:DepreciationAndAmortization

us-gaap:DerivativeGainLossOnDerivativeNet
us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:HedgingDesignation
us-gaap:DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet
us-gaap:HedgingDesignation

us-gaap:DistributedEarnings

us-gaap:Dividends

us-gaap:DividendsCommonStock
us-gaap:StatementEquityComponents

us-gaap:DividendsPreferredStock
us-gaap:StatementEquityComponents

us-gaap:EquipmentExpense

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
us-gaap:FairValueByAssetClass
us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases
us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:FairValueByAssetClass
us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales

us-gaap:FairValueOptionChangesInFairValueGainLoss1
us-gaap:FinancialInstrument

us-gaap:FederalDepositInsuranceCorporationPremiumExpense

us-gaap:FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, zions:FinancialReceivables
zions:FinancialReceivables
us-gaap:DerivativeInstrumentRisk, us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents
us-gaap:GainLossOnDerivativeInstrumentsNetPretax
dei:LegalEntity
us-gaap:GainsLossesOnSalesOfOtherRealEstate
us-gaap:FinancialInstrument
us-gaap:StatementBusinessSegments

us-gaap:IncreaseDecreaseInDeposits

us-gaap:IncreaseDecreaseInFairValueOfHedgedItemInInterestRateFairValueHedge1
us-gaap:DerivativeInstrumentRisk
us-gaap:DerivativeInstrumentRisk
us-gaap:IncreaseDecreaseInFairValueOfInterestRateFairValueHedgingInstruments1

us-gaap:IncreaseDecreaseInLoansHeldForSale

us-gaap:IncreaseDecreaseInOperatingLiabilities

us-gaap:IncreaseDecreaseInOtherOperatingAssets

us-gaap:IncreaseDecreaseInTradingSecurities

us-gaap:InterestAndDividendIncomeOperating

us-gaap:InterestExpenseDeposits

us-gaap:InterestIncomeExpenseAfterProvisionForLoanLoss
dei:LegalEntity
us-gaap:ConsolidationItems
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
us-gaap:StatementBusinessSegments

us-gaap:InterestIncomeExpenseNet
dei:LegalEntity
us-gaap:ConsolidationItems
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
us-gaap:StatementBusinessSegments

us-gaap:InterestIncomeMoneyMarketDeposits

us-gaap:InterestPaid

us-gaap:InvestmentIncomeInterest
us-gaap:InvestmentType
us-gaap:InvestmentType, zions:TaxableVSNontaxableIncome
zions:TaxableVSNontaxableIncome

us-gaap:InvestmentIncomeNonoperating

us-gaap:LaborAndRelatedExpense

us-gaap:LeaseCost

us-gaap:LoansAndLeasesReceivableGainLossOnSalesNet

us-gaap:NoninterestExpense
dei:LegalEntity
us-gaap:ConsolidationItems
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
us-gaap:StatementBusinessSegments

us-gaap:NoninterestIncome
dei:LegalEntity
us-gaap:ConsolidationItems
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
us-gaap:StatementBusinessSegments

us-gaap:NoninterestIncomeOtherOperatingIncome
dei:LegalEntity
us-gaap:ConsolidationItems
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
us-gaap:StatementBusinessSegments

us-gaap:OccupancyNet

us-gaap:OperatingLeaseLeaseIncome

us-gaap:OperatingLeasePayments

us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax
us-gaap:RetirementPlanType

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax
us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:HedgingDesignation
us-gaap:HedgingDesignation

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax
us-gaap:DerivativeInstrumentRisk
us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:HedgingDesignation
us-gaap:HedgingDesignation
us-gaap:DerivativeInstrumentRisk, us-gaap:IncomeStatementLocation
us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTax
us-gaap:DerivativeInstrumentRisk
us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationTax
us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:HedgingDesignation
us-gaap:OtherComprehensiveIncomeLossDerivativeExcludedComponentIncreaseDecreaseAdjustmentsBeforeTax
us-gaap:HedgingDesignation

us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax

us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansNetOfTax

us-gaap:OtherComprehensiveIncomeLossTax
us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:HedgingDesignation
us-gaap:OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax
us-gaap:HedgingDesignation

us-gaap:OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax
us-gaap:RetirementPlanType
us-gaap:OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax

us-gaap:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
us-gaap:RetirementPlanType
us-gaap:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax

us-gaap:OtherNoncashIncomeExpense

us-gaap:OtherNoninterestExpense

us-gaap:OtherPreferredStockDividendsAndAdjustments

us-gaap:OtherRevenueExpenseFromRealEstateOperations

us-gaap:PaymentsForOriginationAndPurchasesOfLoansHeldForSale

us-gaap:PaymentsForProceedsFromOtherInvestingActivities

us-gaap:PaymentsForProceedsFromOtherLoansAndLeases

us-gaap:PaymentsForProceedsFromShortTermInvestments

us-gaap:PaymentsToAcquireAvailableForSaleSecurities

us-gaap:PaymentsToAcquireHeldToMaturitySecurities
us-gaap:StatementClassOfStock
us-gaap:PreferredStockDividendRatePercentage

us-gaap:ProceedsFromIssuanceOfCommonStock

us-gaap:ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities

us-gaap:ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities

us-gaap:ProceedsFromPaymentsForOtherFinancingActivities

us-gaap:ProceedsFromRepaymentsOfDebt

us-gaap:ProfessionalFees

us-gaap:ProvisionForLoanAndLeaseLosses
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable

us-gaap:ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax
us-gaap:RetirementPlanType
us-gaap:DerivativeInstrumentRisk, us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents
us-gaap:ReclassificationFromAociCurrentPeriodTax
us-gaap:DebtInstrument, us-gaap:LongtermDebtType
us-gaap:RepaymentsOfDebt

us-gaap:RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability

us-gaap:SalesTypeAndDirectFinancingLeasesProfitLoss
us-gaap:StatementEquityComponents
us-gaap:StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures
us-gaap:StatementEquityComponents
us-gaap:StockIssuedDuringPeriodSharesShareBasedCompensation

us-gaap:StockIssuedDuringPeriodValueShareBasedCompensation
us-gaap:StatementEquityComponents

us-gaap:StockRepurchasedDuringPeriodShares
us-gaap:StatementEquityComponents

us-gaap:StockRepurchasedDuringPeriodValue
us-gaap:StatementEquityComponents

us-gaap:TransferOfPortfolioLoansAndLeasesToHeldForSale1

us-gaap:TransferToOtherRealEstate

us-gaap:UndistributedEarnings

us-gaap:UndistributedEarningsLossAvailableToCommonShareholdersDiluted

us-gaap:VariableLeaseCost
us-gaap:InformationByCategoryOfDebtSecurity
zions:AvailableForSaleDebtSecuritiesGrossUnrealizedGainsRecognizedInOCI
us-gaap:InformationByCategoryOfDebtSecurity
zions:AvailableForSaleDebtSecuritiesGrossUnrealizedLossesRecognizedInOCI

zions:AverageDeposits
dei:LegalEntity
us-gaap:ConsolidationItems
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
us-gaap:StatementBusinessSegments

zions:AverageLoansAndLeases
dei:LegalEntity
us-gaap:ConsolidationItems
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
us-gaap:StatementBusinessSegments

zions:CapitalMarketsAndForeignExchangeGainLoss
dei:LegalEntity
us-gaap:ConsolidationItems
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
us-gaap:StatementBusinessSegments

zions:CardFees
dei:LegalEntity
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
us-gaap:StatementBusinessSegments

zions:CommercialAccountFees
dei:LegalEntity
us-gaap:ConsolidationItems
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
us-gaap:StatementBusinessSegments

zions:CreditAndCollectionServices
us-gaap:StatementEquityComponents
zions:CumulativeEffectAdjustmentMeasurementOfCreditLossesOnFinancialInstruments
us-gaap:InformationByCategoryOfDebtSecurity
zions:DebSecuritiesHeldtomaturityGrossUnrealizedGains
us-gaap:InformationByCategoryOfDebtSecurity
zions:DebtSecuritiesHeldtomaturityGrossUnrealizedLosses

zions:DerivativeGainRecognizedOnUndesignatedDerivatives
us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:HedgingDesignation
zions:DerivativeInstrumentNoninterestIncomeExpense
us-gaap:FinancialInstrument, us-gaap:HedgingDesignation
us-gaap:HedgingDesignation

zions:DilutiveEffectOfRestrictedStockAwardsAndUnits

zions:DilutiveEffectofCommonStockWarrants

zions:DilutiveEffectofStockOptions
us-gaap:StatementEquityComponents
zions:EmployeePlansAccumulatedPaidinCapital
us-gaap:FairValueByAssetClass
zions:FairValueAssetsMeasuredOnRecurringBasisAndGainLossIncludedInEquitySecuritiesGainsLossesNet
us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:FairValueByAssetClass
zions:FairValueMeasurementwithUnobservableInputsReconciliationRecurringBasisAssetNoninterestIncome
us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel

zions:LoanRelatedFeesAndIncome

zions:LoansModifiedAsTroubledDebtRestructuringsLoans
us-gaap:StatementEquityComponents
zions:NetSharesIssuedFromStockWarrantExercises

zions:Netchangeinothernoninterestbearinginvestments

zions:Netunrealizedgainslossesonothernoninterestbearinginvestments

zions:NoninterestincomeCustomerrelatedFees
dei:LegalEntity
us-gaap:ConsolidationItems
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
us-gaap:StatementBusinessSegments

zions:OtherCustomerRelatedFees
dei:LegalEntity
zions:OtherNonInterestIncomeNonCustomerRelatedGainLoss
us-gaap:ConsolidationItems
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
us-gaap:StatementBusinessSegments

zions:OtherNoninterestBearingInvestmentsNonmarketableEquitySecuritiesGrossGains

zions:OtherNoninterestBearingInvestmentsNonmarketableEquitySecuritiesGrossLosses
dei:LegalEntity
zions:OtherNoninterestIncomeFromContractsWithCustomers
us-gaap:ConsolidationItems
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
us-gaap:StatementBusinessSegments
dei:LegalEntity
zions:OtherNoninterestIncomeLossNonASC606CustomerRelated
us-gaap:ConsolidationItems
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
us-gaap:StatementBusinessSegments

zions:PrincipleAmountOfLoansHeldForSaleSold

zions:ProvisionforCreditLosses
dei:LegalEntity
us-gaap:ConsolidationItems
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
us-gaap:StatementBusinessSegments

zions:ProvisionforUnfundedLendingCommitmentsdecrease
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable

zions:RetailAndBusinessBankingFees
dei:LegalEntity
us-gaap:ConsolidationItems
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
us-gaap:StatementBusinessSegments

zions:StockholdersEquityChangeInDeferredCompensation
us-gaap:StatementEquityComponents
dei:LegalEntity
zions:TotalnoninterestincomefromcontractswithcustomersASC606
us-gaap:ConsolidationItems
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
us-gaap:StatementBusinessSegments

zions:UndistributedEarningsApplicabletoNonvestedShares

zions:WealthManagementAndTrustFees
dei:LegalEntity
us-gaap:ConsolidationItems
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
us-gaap:StatementBusinessSegments

us-gaap:AssetsFairValueDisclosure
us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FinancialInstrument
us-gaap:FinancialInstrument

us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
us-gaap:FinancialInstrument

us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
us-gaap:FinancialInstrument

us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis
us-gaap:FinancialInstrument
us-gaap:InformationByCategoryOfDebtSecurity
us-gaap:InformationByCategoryOfDebtSecurity, zions:SecuritiesMaturity
zions:SecuritiesMaturity

us-gaap:AvailableForSaleSecurities

us-gaap:AvailableForSaleSecuritiesAmortizedCost
zions:SecuritiesMaturity
us-gaap:FinancialInstrument
us-gaap:AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
us-gaap:InformationByCategoryOfDebtSecurity
us-gaap:FinancialInstrument
us-gaap:AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
us-gaap:InformationByCategoryOfDebtSecurity
us-gaap:FinancialInstrument
us-gaap:AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
us-gaap:InformationByCategoryOfDebtSecurity

us-gaap:AvailableForSaleSecuritiesDebtSecurities
us-gaap:FinancialInstrument
us-gaap:InformationByCategoryOfDebtSecurity

us-gaap:AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1

us-gaap:CapitalLeaseObligations

us-gaap:CashAndDueFromBanks

us-gaap:DebtInstrumentCarryingAmount
us-gaap:FinancialInstrument
us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger
us-gaap:FinancialInstrument
us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss
us-gaap:InformationByCategoryOfDebtSecurity
us-gaap:FinancialInstrument
us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months
us-gaap:FinancialInstrument
us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss
us-gaap:InformationByCategoryOfDebtSecurity
us-gaap:InformationByCategoryOfDebtSecurity, zions:SecuritiesMaturity
us-gaap:DebtSecuritiesAvailableForSaleMaturityAfterFiveThroughTenYearsWeightedAverageYield
zions:SecuritiesMaturity
us-gaap:InformationByCategoryOfDebtSecurity, zions:SecuritiesMaturity
us-gaap:DebtSecuritiesAvailableForSaleMaturityAfterOneThroughFiveYearsWeightedAverageYield
zions:SecuritiesMaturity
us-gaap:InformationByCategoryOfDebtSecurity, zions:SecuritiesMaturity
us-gaap:DebtSecuritiesAvailableForSaleMaturityRollingAfter10YearsWeightedAverageYield
zions:SecuritiesMaturity
us-gaap:InformationByCategoryOfDebtSecurity, zions:SecuritiesMaturity
us-gaap:DebtSecuritiesAvailableForSaleMaturityWithinOneYearWeightedAverageYield
zions:SecuritiesMaturity
us-gaap:FinancialInstrument
us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPosition
us-gaap:FinancialInstrument
us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss
us-gaap:InformationByCategoryOfDebtSecurity

us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions

us-gaap:Deposits

us-gaap:DepositsSavingsDeposits

us-gaap:DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowed

us-gaap:DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedAmountOffsetAgainstCollateral

us-gaap:DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedCollateralObligationToReturnSecurities

us-gaap:DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedGross

us-gaap:DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedLiability

us-gaap:DerivativeAssets

us-gaap:DerivativeCollateralObligationToReturnSecurities

us-gaap:DerivativeCollateralRightToReclaimCash

us-gaap:DerivativeCollateralRightToReclaimSecurities

us-gaap:DerivativeFairValueOfDerivativeAsset
us-gaap:BalanceSheetLocation
us-gaap:BalanceSheetLocation, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:FinancialInstrument, us-gaap:HedgingDesignation
us-gaap:BalanceSheetLocation, us-gaap:FinancialInstrument, us-gaap:HedgingDesignation
us-gaap:BalanceSheetLocation, us-gaap:HedgingDesignation

us-gaap:DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral

us-gaap:DerivativeFairValueOfDerivativeLiability
us-gaap:BalanceSheetLocation
us-gaap:BalanceSheetLocation, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:FinancialInstrument, us-gaap:HedgingDesignation
us-gaap:BalanceSheetLocation, us-gaap:FinancialInstrument, us-gaap:HedgingDesignation
us-gaap:BalanceSheetLocation, us-gaap:HedgingDesignation

us-gaap:DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral

us-gaap:DerivativeLiabilities

us-gaap:DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoaned

us-gaap:DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedAmountOffsetAgainstCollateral

us-gaap:DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedAsset

us-gaap:DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedCollateralRightToReclaimCash

us-gaap:DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedCollateralRightToReclaimSecurities

us-gaap:DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedGross

us-gaap:DerivativeNotionalAmount
us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:HedgingDesignation
us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:FinancialInstrument, us-gaap:HedgingDesignation
us-gaap:FinancialInstrument
us-gaap:FinancialInstrument, us-gaap:HedgingDesignation
us-gaap:HedgingDesignation

us-gaap:EquityMethodInvestmentsFairValueDisclosure
us-gaap:FairValueByAssetClass
us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:FederalFundsPurchasedAndSecuritiesSoldUnderAgreementsToRepurchase

us-gaap:FederalFundsSoldAndSecuritiesPurchasedUnderAgreementsToResell

us-gaap:FederalHomeLoanBankStockAndFederalReserveBankStock

us-gaap:FinanceLeaseWeightedAverageDiscountRatePercent

us-gaap:FinancialInstrumentsSoldNotYetPurchasedAtFairValue
us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:FinancingReceivableAllowanceForCreditLosses
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
us-gaap:FinancingReceivableNonaccrualNoAllowance

us-gaap:FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:FinancingReceivablesPeriodPastDue

us-gaap:FinancingReceivableRecordedInvestmentCurrent
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us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
zions:TermLoansCreditQualityOutstandingOtherConsumerAmortizedCostBasisOriginatedInCurrentFiscalYear
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:InternalCreditAssessment
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
zions:TermLoansCreditQualityOutstandingOtherConsumerAmortizedCostBasisOriginatedInFiscalYearBeforeLatestFiscalYear
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:InternalCreditAssessment
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
zions:TermLoansCreditQualityOutstandingOtherConsumerAmortizedCostBasisOriginatedThreeYearsBeforeLatestFiscalYear
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:InternalCreditAssessment
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
zions:TermLoansCreditQualityOutstandingOtherConsumerAmortizedCostBasisOriginatedTwoYearsBeforeLatestFiscalYear
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:InternalCreditAssessment
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
zions:TermLoansCreditQualityOutstandingOwnerOccupiedAmortizedCostBasisOriginatedFiveOrMoreYearsBeforeLatestFiscalYear
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:InternalCreditAssessment
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
zions:TermLoansCreditQualityOutstandingOwnerOccupiedAmortizedCostBasisOriginatedFourYearsBeforeLatestFiscalYear
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:InternalCreditAssessment
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
zions:TermLoansCreditQualityOutstandingOwnerOccupiedAmortizedCostBasisOriginatedInCurrentFiscalYear
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:InternalCreditAssessment
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
zions:TermLoansCreditQualityOutstandingOwnerOccupiedAmortizedCostBasisOriginatedInFiscalYearBeforeLatestFiscalYear
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:InternalCreditAssessment
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
zions:TermLoansCreditQualityOutstandingOwnerOccupiedAmortizedCostBasisOriginatedThreeYearsBeforeLatestFiscalYear
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:InternalCreditAssessment
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
zions:TermLoansCreditQualityOutstandingOwnerOccupiedAmortizedCostBasisOriginatedTwoYearsBeforeLatestFiscalYear
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:InternalCreditAssessment
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
zions:TermLoansCreditQualityOutstandingSBAPPPAmortizedCostBasisOriginatedFiveOrMoreYearsBeforeLatestFiscalYear
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:InternalCreditAssessment
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
zions:TermLoansCreditQualityOutstandingSBAPPPAmortizedCostBasisOriginatedFourYearsBeforeLatestFiscalYear
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:InternalCreditAssessment
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
zions:TermLoansCreditQualityOutstandingSBAPPPAmortizedCostBasisOriginatedInCurrentFiscalYear
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:InternalCreditAssessment
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
zions:TermLoansCreditQualityOutstandingSBAPPPAmortizedCostBasisOriginatedInFiscalYearBeforeLatestFiscalYear
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:InternalCreditAssessment
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
zions:TermLoansCreditQualityOutstandingSBAPPPAmortizedCostBasisOriginatedThreeYearsBeforeLatestFiscalYear
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:InternalCreditAssessment
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
zions:TermLoansCreditQualityOutstandingSBAPPPAmortizedCostBasisOriginatedTwoYearsBeforeLatestFiscalYear
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:InternalCreditAssessment
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
zions:TermLoansCreditQualityOutstandingTermAmortizedCostBasisOriginatedFiveOrMoreYearsBeforeLatestFiscalYear
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:InternalCreditAssessment
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
zions:TermLoansCreditQualityOutstandingTermAmortizedCostBasisOriginatedFourYearsBeforeLatestFiscalYear
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:InternalCreditAssessment
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
zions:TermLoansCreditQualityOutstandingTermAmortizedCostBasisOriginatedInCurrentFiscalYear
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:InternalCreditAssessment
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
zions:TermLoansCreditQualityOutstandingTermAmortizedCostBasisOriginatedInFiscalYearBeforeLatestFiscalYear
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:InternalCreditAssessment
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
zions:TermLoansCreditQualityOutstandingTermAmortizedCostBasisOriginatedThreeYearsBeforeLatestFiscalYear
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:InternalCreditAssessment
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
zions:TermLoansCreditQualityOutstandingTermAmortizedCostBasisOriginatedTwoYearsBeforeLatestFiscalYear
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:InternalCreditAssessment
us-gaap:DerivativeInstrumentRisk
zions:TerminatedSwapsMaturityValue
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
zions:TotalLoansCreditQualityOutstanding14FamilyResidentialAmortizedCostBasis
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:InternalCreditAssessment
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
zions:TotalLoansCreditQualityOutstandingBankcardAndOtherRevolvingPlansAmortizedCostBasis
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:InternalCreditAssessment
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
zions:TotalLoansCreditQualityOutstandingCommercialAndIndustrialAmortizedCostBasis
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:InternalCreditAssessment
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
zions:TotalLoansCreditQualityOutstandingConstructionAndLandDevelopmentAmortizedCostBasis
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:InternalCreditAssessment
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
zions:TotalLoansCreditQualityOutstandingConstructionAndOtherConsumerRealEstateAmortizedCostBasis
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:InternalCreditAssessment
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
zions:TotalLoansCreditQualityOutstandingHomeEquityCreditLineAmortizedCostBasis
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:InternalCreditAssessment
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
zions:TotalLoansCreditQualityOutstandingLeasingAmortizedCostBasis
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:InternalCreditAssessment
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
zions:TotalLoansCreditQualityOutstandingMunicipalAmortizedCostBasis
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:InternalCreditAssessment
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
zions:TotalLoansCreditQualityOutstandingOtherConsumerAmortizedCostBasis
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:InternalCreditAssessment
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
zions:TotalLoansCreditQualityOutstandingOwnerOccupiedAmortizedCostBasis
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:InternalCreditAssessment
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
zions:TotalLoansCreditQualityOutstandingSBAPPPAmortizedCostBasis
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:InternalCreditAssessment
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
zions:TotalLoansCreditQualityOutstandingTermAmortizedCostBasis
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:InternalCreditAssessment

zions:TotalUnfundedLendingCommitments

zions:UnfundedLendingCommitmentsonTroubledDebtRestructuring

Tables

  2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:CommonStockSharesIssued ▁▁▂▃▃▄▅▆▆▇▇▇████████████▅▅▅▅▅▅▅▅▅▅▅▅▅▅▄▄▃▁163163165170176182187192195197197199202202203203205204204204203203203202185184184184184184184184184184184184184183182177173160
us-gaap:CommonStockSharesOutstanding ▁▁▂▃▃▄▅▆▆▇▇▇████████████▅▅▅▅▅▅▅▅▅▅▅▅▅▅▄▄▃▁163163165170176182187192195197197199202202203203205204204204203203203202185184184184184184184184184184184184184183182177173160
 us-gaap:CommonStockSharesOutstanding us-gaap:StatementEquityComponents us-gaap:CommonStock▁▁▂▃▃▄▅▆▆▇▇▇████████████▅▅▅▅▅▅▅▅▅▅▅▅▅▅▄▄▃▁163163165170176182187192195197197199202202203203205204204204203203203202185184184184184184184184184184184184184183182177173160
us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding ▁█164172NA181189195NA205209210NA209208210NA204204204NA204202202NA197185185NA184184183NA183183182NA182182181NA172161151
us-gaap:WeightedAverageNumberOfSharesOutstandingBasic ▁█163164NA173179184NA192195196NA200201202NA204204203NA203202202NA196184184NA184183183NA183182182NA182182181NA172161151
us-gaap:EarningsPerShareBasic ▅▄▇█▇███▇█▆▆▆▆▆▆▅▅▅▅▄▅▅▅▆▅▃█▅▅▄▅▅▄▅▅▄▄▂▂▁▂0.340.041.031.231.051.11.141.110.951.160.570.750.760.630.610.570.440.380.430.41-0.010.370.330.40.560.41-0.321.130.30.480.190.340.30.140.240.350.160.08-0.62-0.47-0.84-0.57
us-gaap:EarningsPerShareDiluted ▅▄▇█▇███▇█▆▆▆▆▆▆▅▅▅▅▄▅▅▅▆▅▃█▅▆▅▅▅▄▅▅▄▄▂▂▁▂0.340.040.971.170.991.041.081.040.891.090.540.720.730.610.60.570.440.380.430.41-0.010.370.330.40.560.41-0.321.120.30.480.190.340.30.140.240.350.160.08-0.62-0.47-0.84-0.57
  2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
 us-gaap:Revenues dei:LegalEntity zions:AmegyCorporationNA153155163166160156157158NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:Revenues dei:LegalEntity zions:CaliforniaBankTrustNA147152153162152155151150NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:Revenues dei:LegalEntity zions:CommerceBankOfWashingtonNA1314141515181413NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:Revenues dei:LegalEntity zions:NationalBankOfArizonaNA6465677368676668NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:Revenues dei:LegalEntity zions:NevadaStateBankNA4649515148494748NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:Revenues dei:LegalEntity zions:OtherSegmentNA2222826151318-5NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:Revenues dei:LegalEntity zions:VectraBankColoradoNA4041414241413940NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:Revenues dei:LegalEntity zions:ZionsBankNA197213218218210217209214NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:Revenues us-gaap:ConsolidationItems us-gaap:CorporateNonSegment30NANANA-4NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:Revenues us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments us-gaap:OperatingSegments,zions:AmegyCorporation151NANANA161NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:Revenues us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments us-gaap:OperatingSegments,zions:CaliforniaBankAndTrust142NANANA156NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:Revenues us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments us-gaap:OperatingSegments,zions:CommerceBankOfWashington14NANANA15NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:Revenues us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments us-gaap:OperatingSegments,zions:NationalBankOfArizona63NANANA70NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:Revenues us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments us-gaap:OperatingSegments,zions:NevadaStateBank45NANANA49NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:Revenues us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments us-gaap:OperatingSegments,zions:ZionsBank194NANANA213NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:Revenues us-gaap:StatementBusinessSegments us-gaap:CorporateNA682NA715NA709NA701NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:Revenues us-gaap:StatementBusinessSegments us-gaap:CorporateAndOther680NANANA701NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:InterestAndFeeIncomeLoansAndLeases ▅▆▇███▇▆▅▄▄▃▃▂▂▂▂▁▂▁▁▁▂▂▂▂514532558581581570554537514497477468469433438436433420429419420415431430433434NA442460453NA479478486NA520523518NA550547547
us-gaap:GainLossOnInvestments ▇▆▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▁▇▇▆▇█-4-632-312-1101525-382003-1333-2-13731NA-4-3-3NA2-10NA4-9-2NA-16NANA
us-gaap:InterestExpense ▂▅▆██▇▅▄▄▃▂▂▂▁▁▁▁▁▁▂▂▂▂▃▃▃327488110115998066584736353026212122222430313131434651NA576266NA708681NA83142128NA130170124
us-gaap:InterestExpenseDebt ▁▄▄▇█▇▅▄▅▄▃▃▂▂▁▁▁▁▂▃▃▃92326414942322829272020161388101012181918NA313438NA434750NANANANANANANANANANANANA
us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic ▄▃▇█▇▇██▇█▇▇▇▆▆▆▆▅▅▅▃▅▅▅▆▆▂▆▅▆▅▆▅▅▅▆▅▅▂▂▁▂821623528825627429029225330826024324818420619117413114714119143125148189157-631721261718717014214113616812689-96-78-136-91
 us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments us-gaap:OperatingSegments,zions:AmegyCorporation47NANANA83NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments us-gaap:OperatingSegments,zions:CaliforniaBankAndTrust22NANANA65NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments us-gaap:OperatingSegments,zions:NationalBankOfArizona12NANANA30NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments us-gaap:OperatingSegments,zions:VectraBankColorado15NANANA13NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments us-gaap:OperatingSegments,zions:ZionsBank43NANANA77NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:IncomeTaxExpenseBenefit ▂▁▄▄▄▄▄▄▄▅█▅▅▃▄▄▄▃▃▃▁▄▃▄▄▄162526658616469567013783804569646041444055143536956NA614360NA605151NA595437NA-31-22-28
us-gaap:IncomeTaxesPaidNet ▂▁▄▄█▁▅▄▆▁▃▆█▁▄▄▆▁▃▂▆▁▁▄▇▁1615447134-265519014084128-6605210103189201581220NA321203NA679-21NA000NA028-352
us-gaap:ProfitLoss ▅▄▇█▇███▇█▆▆▇▆▆▆▆▅▅▅▄▅▅▅▆▅▂▅▅▅▄▅▅▅▅▅▅▄▂▂▁▂66141832221982132262231972381241601681391371271139010210013928195119101-4111183110571099189881087252-72-47-113-63
 us-gaap:ProfitLoss us-gaap:StatementEquityComponents us-gaap:RetainedEarnings▃▁▆█▇▇██▇█▄▆▆▅▅▅▄▃▄▄▁▃▃▄▄▄66141832221982132262231972381231611691391371271139010210013928195119101NANANA110NANANA89NANANA52NANANA-60
us-gaap:ComprehensiveIncomeNetOfTax ▁█162230NA245346341NA178148110NA152230150NA113149133641199310564121128147NA101115149NA15187110NA246714NANANANA
us-gaap:OtherComprehensiveIncomeLossNetOfTax ▆█▄▄▇▆▆▃▃▁▂▃▅▄▁▃▄▄▃▄▅▄▃▄▄▅96216-623148128111-45-49-128-82-86211-131-133542-37187913-1725846NA-93239NA41-420NANANANANANANANA
 us-gaap:OtherComprehensiveIncomeLossNetOfTax us-gaap:StatementEquityComponents us-gaap:AccumulatedOtherComprehensiveIncome▆█▄▄▇▆▆▃▃▁▂▃▅▄▁▃▄▄▃▄▅▄▃▄▄▅96216-624147128111-46-48-128-57-86211-131-133542-37187913-1725846NANANA39NANANA20NANANANANANANANA
us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic ▅▄▇█▇███▇█▆▆▇▆▆▆▅▅▅▅▄▅▅▅▆▅▂█▅▅▄▅▅▄▄▅▄▄▁▂▁▂57617421418920521721518723111415215412912411690788884-175667910476-5920955883562552544652914-110-80-135-86
us-gaap:NetIncomeLossAvailableToCommonStockholdersDiluted ▃▁▆▇▇▇██▇█▄▆▆567171213188204215214186229113151153NANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
 us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic as a percentage of us-gaap:Revenues dei:LegalEntity zions:AmegyCorporationNA153155163166160156157158NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic as a percentage of us-gaap:Revenues dei:LegalEntity zions:CaliforniaBankTrustNA147152153162152155151150NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic as a percentage of us-gaap:Revenues dei:LegalEntity zions:CommerceBankOfWashingtonNA1314141515181413NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic as a percentage of us-gaap:Revenues dei:LegalEntity zions:NationalBankOfArizonaNA6465677368676668NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic as a percentage of us-gaap:Revenues dei:LegalEntity zions:NevadaStateBankNA4649515148494748NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic as a percentage of us-gaap:Revenues dei:LegalEntity zions:OtherSegmentNA2222826151318-5NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic as a percentage of us-gaap:Revenues dei:LegalEntity zions:VectraBankColoradoNA4041414241413940NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic as a percentage of us-gaap:Revenues dei:LegalEntity zions:ZionsBankNA197213218218210217209214NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic as a percentage of us-gaap:Revenues us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments us-gaap:OperatingSegments,zions:AmegyCorporation151NANANA161NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic as a percentage of us-gaap:Revenues us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments us-gaap:OperatingSegments,zions:CaliforniaBankAndTrust142NANANA156NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic as a percentage of us-gaap:Revenues us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments us-gaap:OperatingSegments,zions:CommerceBankOfWashington14NANANA15NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic as a percentage of us-gaap:Revenues us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments us-gaap:OperatingSegments,zions:NationalBankOfArizona63NANANA70NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic as a percentage of us-gaap:Revenues us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments us-gaap:OperatingSegments,zions:NevadaStateBank45NANANA49NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic as a percentage of us-gaap:Revenues us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments us-gaap:OperatingSegments,zions:ZionsBank194NANANA213NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic as a percentage of us-gaap:Revenues us-gaap:StatementBusinessSegments us-gaap:CorporateNA682NA715NA709NA701NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
  2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:Assets █▇▆▆▆▆▆▅▅▅▅▅▅▅▄▄▃▃▃▃▃▃▃▂▂▂▂▂▂▂▂▂▂▂▂▁▁▁▁▁▁▁764477146769172703617006569195687466673166457664816628865564654466546363239610385964259179596695841058365575555720855458551115608056031551885490454110555115308753407528965314951531513615080751034510475214751712
us-gaap:Liabilities █▇▆▆▆▆▆▅▅▅▅▅▅▅▄▄▃▃▃▃▃▃▃▂▂▃▃▂▂▂▃▂▂▂▂▁▁▁▁▁▁▂688726399561819628526246661607611685917858836588375860957803576975773355604533595201651554521625077250835501014983948136484114949449566488554804447759494634716846917465094616544612444484406344387445534572645856
us-gaap:LiabilitiesAndStockholdersEquity █▇▆▆▆▆▆▅▅▅▅▅▅▅▄▄▃▃▃▃▃▃▃▂▂▂▂▂▂▂▂▂▂▂▂▁▁▁▁▁▁▁764477146769172703617006569195687466673166457664816628865564654466546363239610385964259179596695841058365575555720855458551115608056031551885490454110555115308753407528965314951531513615080751034510475214751712
us-gaap:StockholdersEquity █▅▁757574727353NA759975887578NANANANANANANANANANANANANANANANANANANA6464633268606355605259216491638969856920691467456648649564215842
 us-gaap:StockholdersEquity us-gaap:StatementEquityComponents us-gaap:AdditionalPaidInCapital▂▁█267526682735NA327135413806NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
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  2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
  2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:PropertyPlantAndEquipmentNet ████▇▇▇▇▇▇▇▇▆▆▆▅▅▄▄▄▃▃▃▃▂▂▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁117311441142114611331125112411111099109810941083106910471019986955925905873856844829811803785726720717706708709714715719726722721720719705707
us-gaap:IntangibleAssetsNetIncludingGoodwill ▁▁▁▁▁▁███101410141014101410141014101510151015NA1016NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:DeferredTaxAssetsLiabilitiesNet ▁▁▂▂▂▃▅▆▅▄▃▇▇▇█▆▆▆▇▇2263734367313017014912393207198231250170164180203201NANA224NANANA304NANANA405NANANA509NANANA540NANANA
  2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
  2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:LongTermDebt ▄▆▆▄▄▄▂▃▁▁▁▁▁▁▂▂▂▂▃▃▃▄▄▄▇▇██▇█████▇▆▆▆▇▇▇▇1353179517231242123612287248793833833833833833835345706988028179441050108910921113193321582273230421732352233723262274228319541898187919131942193919342016
 us-gaap:LongTermDebt us-gaap:FairValueByFairValueHierarchyLevel,us-gaap:FairValueByMeasurementBasis us-gaap:FairValueInputsLevel2,us-gaap:CarryingReportedAmountFairValueDisclosure1353NA1723NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:LongTermDebt us-gaap:FairValueByFairValueHierarchyLevel,us-gaap:FairValueByMeasurementBasis us-gaap:FairValueInputsLevel2,us-gaap:EstimateOfFairValueFairValueDisclosure1320NA1751NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:StockholdersEquity █▅▁757574727353NA759975887578NANANANANANANANANANANANANANANANANANANA6464633268606355605259216491638969856920691467456648649564215842
 us-gaap:StockholdersEquity us-gaap:StatementEquityComponents us-gaap:AdditionalPaidInCapital▂▁█267526682735NA327135413806NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:StockholdersEquity us-gaap:StatementEquityComponents us-gaap:RetainedEarnings▁▁█397939794009NA373736033456NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest NA74727353750975997588757875537621764476797761774977307634767976267625750776387530745473697322670065866464633268606350604859186489638669836918691367446647649464215856
 us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest us-gaap:StatementEquityComponents us-gaap:AccumulatedOtherComprehensiveIncomeNA259434925-122-250-361-315-267-139-57-49-111-1211023-11-54-16-35-114-128-110-136-145-192-384-374-406-446-534-576-571-592-588-504-499-461-452-433-428
 us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest us-gaap:StatementEquityComponents us-gaap:CommonStockNA00000004231434644454552466046964724474747834777476647564738472847234717419241854179417241674170416641624157416241634160415841784163407039643517
 us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest us-gaap:StatementEquityComponents us-gaap:ParentNA7472735375097599758875787553762176447679NANANA7634NANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest us-gaap:StatementEquityComponents us-gaap:PreferredStockNA56656656656656656656656656656656656671070970970982882810041004100410041004100410031003100317281301112811231800173723772354232921622056187518061532
 us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest us-gaap:StatementEquityComponents us-gaap:RetainedEarningsNA3979400938923737360334563296313929992807270025722435232122112110203119661894182318361769171116401542147315401338129012031170111010601036994931904889100110831220
us-gaap:AdditionalPaidInCapital ▁▁▁▃▄▅▇█26752668273530023271354138064052NANA0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:RetainedEarningsAccumulatedDeficit ████▇▇▇▆▆▆▅▅▅▄▄▄▄▄▃▃▃▃▃▃▃▂▂▂▂▂▂▂▁▁▁▁▁▁▁▁▁▂39793979400938923737360334563296313929992807270025722435232122112110203119661894182318361769171116401542147315401338129012031170111010601036994931904889100110831220
us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax █▇▆▆▆▄▄▃▃▃▄▅▅▅▄▅▆▅▅▅▅▅▄▅▄▄▄▃▃▂▂▁▁▁▁▁▂▂▂▂▂▂355259434925-122-250-361-315-267-139-57-49-111-1211023-11-54-16-35-114-128-110-136-145-192-384-374-406-446-534-576-571-592-588-504-499-461-452-433-428
 us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax us-gaap:StatementEquityComponents us-gaap:AccumulatedGainLossNetCashFlowHedgeParent86NA28NA37NA-1NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax us-gaap:StatementEquityComponents us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss270NA29NA9-106-228-335-289-240-114-28-20-81-92354613-189-1-80-91-87-112-120-167-334-324-357-397-483-525NA-546NANANANANANANA
 us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax us-gaap:StatementEquityComponents us-gaap:AccumulatedOtherComprehensiveIncome355NA43NA25NA-250NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:NetCashProvidedByUsedInOperatingActivities ▆▄▇▄▆▁▇█▄▆▄▅▅█▄▅▂▅▄▅▃▃▄▅▂▄245153351126262-4235138716327512522719538013322811222148212858811619812126NA272311210NA93260248NA215346269NA37288670
us-gaap:NetCashProvidedByUsedInInvestingActivities ▁▄█▇▆▇▅▆▇▆▆▇▇▄▅▅▇▇▅▆▆▆▅▅█▇-5176-2125978112-80287-1967-410100-429-842-24-173-2880-1957-1456-158136-1156-271-810-413-1444-1147117575NA-240-669399NA313-567-63NA-260-65528NA753-528-1648
us-gaap:NetCashProvidedByUsedInFinancingActivities █▅▃▂▃▂▄▂▂▂▃▂▂▅▅▄▃▂▄▂▃▃▄▃▁▂4771199754220542-123171372-26576724-143-107232920081221189-6391203-967622031584154-1145-36NA150612-1523NA-471349-326NA112395-272NA-1133464652
  2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:NetCashProvidedByUsedInOperatingActivities ▆▄▇▄▆▁▇█▄▆▄▅▅█▄▅▂▅▄▅▃▃▄▅▂▄245153351126262-4235138716327512522719538013322811222148212858811619812126NA272311210NA93260248NA215346269NA37288670
us-gaap:ProfitLoss ▅▄▇█▇███▇█▆▆▇▆▆▆▆▅▅▅▄▅▅▅▆▅▂▅▅▅▄▅▅▅▅▅▅▄▂▂▁▂66141832221982132262231972381241601681391371271139010210013928195119101-4111183110571099189881087252-72-47-113-63
 us-gaap:ProfitLoss us-gaap:StatementEquityComponents us-gaap:RetainedEarnings▃▁▆█▇▇██▇█▄▆▆▅▅▅▄▃▄▄▁▃▃▄▄▄66141832221982132262231972381231611691391371271139010210013928195119101NANANA110NANANA89NANANA52NANANA-60
us-gaap:DeferredIncomeTaxExpenseBenefit ▁▁▃▃▃▃▃▃▃▃█▃▃▃▃▃▃▃▄▃▁▃▃▃▁▆-48-460-5-12154-6-1113150-4-51301-6-421-10-44332-5878NA5-71NA6019NA413353NA-21-15-36
us-gaap:ShareBasedCompensation ▂▇▁▂▁█▁▁▂▇▁▁▂▇▁▂▂▆51345414445134451246511NANANANANANANANANANANANANANANANANANANANANANANANA
  2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:NetCashProvidedByUsedInInvestingActivities ▁▄█▇▆▇▅▆▇▆▆▇▇▄▅▅▇▇▅▆▆▆▅▅█▇-5176-2125978112-80287-1967-410100-429-842-24-173-2880-1957-1456-158136-1156-271-810-413-1444-1147117575NA-240-669399NA313-567-63NA-260-65528NA753-528-1648
us-gaap:PaymentsToAcquirePropertyPlantAndEquipment ▅▂▁▂▃▁▃▃▁▂▃▃▄▅▅▅▅▃▅▃▂▂▃▁▃█5428233435253936262836394450525151405138333336263576NA202615NA151715NA221920NA251715
  2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:NetCashProvidedByUsedInFinancingActivities █▅▃▂▃▂▄▂▂▂▃▂▂▅▅▄▃▂▄▂▃▃▄▃▁▂4771199754220542-123171372-26576724-143-107232920081221189-6391203-967622031584154-1145-36NA150612-1523NA-471349-326NA112395-272NA-1133464652
us-gaap:PaymentsOfDividends ▇█▇█▇█▇█▆▅▄▃▂▂▂▂▁▂▂▂▂▁▁▁▁▁6466646961666468554940342629263022272827292324232423NA343524NA323540NA404034NA292122
us-gaap:PaymentsOfDividends ▇█▇█▇█▇█▆▅▄▃▂▂▂▂▁▂▂▂▂▁▁▁▁▁6466646961666468554940342629263022272827292324232423NA343524NA323540NA404034NA292122
us-gaap:PaymentsForRepurchaseOfCommonStock ▁▃████▇▆▄▄▄▄▂▂▂▂▁▁▁▁175276275275276250186126122115115525052455160NANANANANANANANANANANANANANANANANANANANANANA
  2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:DebtInstrumentInterestRateStatedPercentage NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:DebtInstrument,us-gaap:LongtermDebtType zions:A335SeniorNotes,us-gaap:SeniorNotes0.0335NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:DebtInstrument,us-gaap:LongtermDebtType zions:A335SeniorNotes,us-gaap:SubordinatedDebt0.0325NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:DebtInstrument,us-gaap:LongtermDebtType zions:A350SeniorNotes,us-gaap:SeniorNotes0.035NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA

us-gaap:CommonStockSharesIssued



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-07-282014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-31
Value16316316517017618218719219519719719920220220320320520420420420320320320217185184184184184184184184184184184184184183182177173160150
Percentage of CommonStockSharesIssued100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Common Stock Shares Issued

us-gaap:CommonStockSharesOutstanding



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-31
Value163163165170176182187192195197197199202202203203205204204204203203203202185184184184184184184184184184184184184183182177173160150
Percentage of CommonStockSharesOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementEquityComponents

us-gaap:CommonStock


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-312007-12-31
Value163163165170176182187192195197197199202202203203205204204204203203203202185184184184184184184184184184184184184183182177173160150115107
Percentage of CommonStockSharesOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.3100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.0

Common Stock Shares Outstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding



Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value164172181189195205209210209208210204204204204202202197185185184184183183183182182182181172161151
Percentage of WeightedAverageNumberOfDilutedSharesOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Weighted Average Number Of Diluted Shares Outstanding

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic



Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value163164173179184192195196200201202204204203203202202196184184184183183183182182182182181172161151
Percentage of WeightedAverageNumberOfSharesOutstandingBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Weighted Average Number Of Shares Outstanding Basic

us-gaap:EarningsPerShareBasic



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value0.340.041.031.231.051.11.141.110.951.160.570.750.760.630.610.570.440.380.430.41-0.010.370.330.40.560.41-0.321.130.30.480.190.340.30.140.240.350.160.08-0.62-0.47-0.84-0.57
Percentage of EarningsPerShareBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Earnings Per Share Basic

us-gaap:EarningsPerShareDiluted



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value0.340.040.971.170.991.041.081.040.891.090.540.720.730.610.60.570.440.380.430.41-0.010.370.330.40.560.41-0.321.120.30.480.190.340.30.140.240.350.160.08-0.62-0.47-0.84-0.57
Percentage of EarningsPerShareDiluted100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Earnings Per Share Diluted

dei:LegalEntity

us-gaap:Revenues

zions:AmegyCorporation


Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value153155163166160156157158
Percentage of Revenues100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating24.624.024.124.323.723.824.926.1
Percentage of InterestAndDividendIncomeOperating zions:AmegyCorporation0.00.00.00.00.00.00.00.0
zions:CaliforniaBankTrust


Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value147152153162152155151150
Percentage of Revenues96.198.193.997.695.099.496.294.9
Percentage of InterestAndDividendIncomeOperating23.623.522.623.722.523.623.924.8
Percentage of InterestAndDividendIncomeOperating zions:CaliforniaBankTrust0.00.00.00.00.00.00.00.0
zions:CommerceBankOfWashington


Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value1314141515181413
Percentage of Revenues8.59.08.69.09.411.58.98.2
Percentage of InterestAndDividendIncomeOperating2.12.22.12.22.22.72.22.1
Percentage of InterestAndDividendIncomeOperating zions:CommerceBankOfWashington0.00.00.00.00.00.00.00.0
zions:NationalBankOfArizona


Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value6465677368676668
Percentage of Revenues41.841.941.144.042.542.942.043.0
Percentage of InterestAndDividendIncomeOperating10.310.09.910.710.110.210.511.2
Percentage of InterestAndDividendIncomeOperating zions:NationalBankOfArizona0.00.00.00.00.00.00.00.0
zions:NevadaStateBank


Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value4649515148494748
Percentage of Revenues30.131.631.330.730.031.429.930.4
Percentage of InterestAndDividendIncomeOperating7.47.67.57.57.17.57.47.9
Percentage of InterestAndDividendIncomeOperating zions:NevadaStateBank0.00.00.00.00.00.00.00.0
zions:OtherSegment


Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value2222826151318-5
Percentage of Revenues14.414.24.915.79.48.311.5-3.2
Percentage of InterestAndDividendIncomeOperating3.53.41.23.82.22.02.9-0.8
Percentage of InterestAndDividendIncomeOperating zions:OtherSegment0.00.00.00.00.00.00.00.0
zions:VectraBankColorado


Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value4041414241413940
Percentage of Revenues26.126.525.225.325.626.324.825.3
Percentage of InterestAndDividendIncomeOperating6.46.36.16.16.16.26.26.6
Percentage of InterestAndDividendIncomeOperating zions:VectraBankColorado0.00.00.00.00.00.00.00.0
zions:ZionsBank


Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value197213218218210217209214
Percentage of Revenues128.8137.4133.7131.3131.2139.1133.1135.4
Percentage of InterestAndDividendIncomeOperating31.732.932.231.931.133.133.135.3
Percentage of InterestAndDividendIncomeOperating zions:ZionsBank0.00.00.00.00.00.00.00.0

us-gaap:ConsolidationItems

us-gaap:CorporateNonSegment


Period End2020-06-302019-06-30
Value30-4
Percentage of Revenues0.0-2.4
Percentage of InterestAndDividendIncomeOperating5.0-0.6
Percentage of InterestAndDividendIncomeOperating us-gaap:CorporateNonSegment0.00.0

us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, zions:AmegyCorporation


Period End2020-06-302019-06-30
Value151161
Percentage of Revenues0.097.0
Percentage of InterestAndDividendIncomeOperating25.423.5
Percentage of InterestAndDividendIncomeOperating us-gaap:OperatingSegments zions:AmegyCorporation0.00.0
us-gaap:OperatingSegments, zions:CaliforniaBankAndTrust


Period End2020-06-302019-06-30
Value142156
Percentage of Revenues0.094.0
Percentage of InterestAndDividendIncomeOperating23.922.8
Percentage of InterestAndDividendIncomeOperating us-gaap:OperatingSegments zions:CaliforniaBankAndTrust0.00.0
us-gaap:OperatingSegments, zions:CommerceBankOfWashington


Period End2020-06-302019-06-30
Value1415
Percentage of Revenues0.09.0
Percentage of InterestAndDividendIncomeOperating2.42.2
Percentage of InterestAndDividendIncomeOperating us-gaap:OperatingSegments zions:CommerceBankOfWashington0.00.0
us-gaap:OperatingSegments, zions:NationalBankOfArizona


Period End2020-06-302019-06-30
Value6370
Percentage of Revenues0.042.2
Percentage of InterestAndDividendIncomeOperating10.610.2
Percentage of InterestAndDividendIncomeOperating us-gaap:OperatingSegments zions:NationalBankOfArizona0.00.0
us-gaap:OperatingSegments, zions:NevadaStateBank


Period End2020-06-302019-06-30
Value4549
Percentage of Revenues0.029.5
Percentage of InterestAndDividendIncomeOperating7.67.2
Percentage of InterestAndDividendIncomeOperating us-gaap:OperatingSegments zions:NevadaStateBank0.00.0
us-gaap:OperatingSegments, zions:ZionsBank


Period End2020-06-302019-06-30
Value194213
Percentage of Revenues0.0128.3
Percentage of InterestAndDividendIncomeOperating32.631.1
Percentage of InterestAndDividendIncomeOperating us-gaap:OperatingSegments zions:ZionsBank0.00.0

us-gaap:StatementBusinessSegments

us-gaap:Corporate


Period End2020-03-312019-09-302019-03-312018-09-30
Value682715709701
Percentage of Revenues445.8438.7443.1446.5
Percentage of InterestAndDividendIncomeOperating109.6105.6105.0111.1
Percentage of InterestAndDividendIncomeOperating us-gaap:Corporate0.00.00.00.0
us-gaap:CorporateAndOther


Period End2020-06-302019-06-30
Value680701
Percentage of Revenues0.0422.3
Percentage of InterestAndDividendIncomeOperating114.3102.5
Percentage of InterestAndDividendIncomeOperating us-gaap:CorporateAndOther0.00.0

Revenues

us-gaap:InterestAndFeeIncomeLoansAndLeases



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value514532558581581570554537514497477468469433438436433420429419420415431430433434442460453479478486520523518550547547
Percentage of InterestAndFeeIncomeLoansAndLeases100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating86.485.586.285.884.984.484.585.184.884.484.984.084.184.187.388.989.188.590.892.192.492.793.393.593.792.993.493.393.593.092.392.993.893.793.894.693.894.4

Interest And Fee Income Loans And Leases

us-gaap:GainLossOnInvestments



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-30
Value-4-632-312-1101525-382003-1333-2-13731-4-3-32-104-9-2-16
Percentage of GainLossOnInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating-0.7-1.00.50.3-0.40.10.3-0.20.20.00.20.90.41.0-0.71.70.6-0.10.00.8-29.30.7-0.4-2.91.66.8-0.9-0.6-0.80.6-0.3-0.10.9-1.6-0.4-2.8

Gain Loss On Investments

us-gaap:InterestExpense



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value32748811011599806658473635302621212222243031313143465157626670868183142128130170124
Percentage of InterestExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating5.411.913.616.216.814.712.210.59.68.06.46.35.45.04.24.44.54.65.26.86.96.96.89.410.110.912.212.713.713.816.615.515.125.523.322.329.221.5

Interest Expense

us-gaap:InterestExpenseDebt



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-31
Value92326414942322829272020161388101012181918313438434750
Percentage of InterestExpenseDebt100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating1.53.74.06.17.26.24.94.44.84.63.63.62.92.51.71.82.12.22.64.04.24.26.87.58.29.29.610.5

Interest Expense Debt

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value821623528825627429029225330826024324818420619117413114714119143125148189157-631721261718717014214113616812689-96-78-136-91
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating13.82.636.342.537.440.644.246.341.752.346.343.644.435.741.239.135.827.831.131.14.331.927.232.440.933.6-12.936.525.635.317.633.127.527.025.330.322.716.2-16.8-13.5-23.3-15.8

dei:LegalEntity

zions:AmegyCorporation


Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value-3255618887738978
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic-200.023.421.234.431.825.230.530.8
Percentage of InterestAndDividendIncomeOperating-5.18.59.012.912.911.114.112.9
Percentage of InterestAndDividendIncomeOperating zions:AmegyCorporation0.00.00.00.00.00.00.00.0
zions:CaliforniaBankTrust


Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value3274847167707172
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic200.031.529.227.724.524.124.328.5
Percentage of InterestAndDividendIncomeOperating5.111.412.410.49.910.711.311.9
Percentage of InterestAndDividendIncomeOperating zions:CaliforniaBankTrust0.00.00.00.00.00.00.00.0
zions:CommerceBankOfWashington


Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value21011891297
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic12.54.33.83.13.34.13.12.8
Percentage of InterestAndDividendIncomeOperating0.31.51.61.21.31.81.41.2
Percentage of InterestAndDividendIncomeOperating zions:CommerceBankOfWashington0.00.00.00.00.00.00.00.0
zions:NationalBankOfArizona


Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value828283326292823
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic50.011.99.712.99.510.09.69.1
Percentage of InterestAndDividendIncomeOperating1.34.34.14.83.94.44.43.8
Percentage of InterestAndDividendIncomeOperating zions:NationalBankOfArizona0.00.00.00.00.00.00.00.0
zions:NevadaStateBank


Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value-114141413131112
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic-6.26.04.95.54.74.53.84.7
Percentage of InterestAndDividendIncomeOperating-0.22.22.12.01.92.01.72.0
Percentage of InterestAndDividendIncomeOperating zions:NevadaStateBank0.00.00.00.00.00.00.00.0
zions:OtherSegment


Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value-15-63-29-54-17-20-17-44
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic-93.8-26.8-10.1-21.1-6.2-6.9-5.8-17.4
Percentage of InterestAndDividendIncomeOperating-2.4-9.7-4.3-7.9-2.5-3.0-2.7-7.3
Percentage of InterestAndDividendIncomeOperating zions:OtherSegment0.00.00.00.00.00.00.00.0
zions:VectraBankColorado


Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value-121517149141213
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic-75.06.45.95.53.34.84.15.1
Percentage of InterestAndDividendIncomeOperating-1.92.32.52.01.32.11.92.1
Percentage of InterestAndDividendIncomeOperating zions:VectraBankColorado0.00.00.00.00.00.00.00.0
zions:ZionsBank


Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value341021028280998992
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic212.543.435.432.029.234.130.536.4
Percentage of InterestAndDividendIncomeOperating5.515.815.112.011.915.114.115.2
Percentage of InterestAndDividendIncomeOperating zions:ZionsBank0.00.00.00.00.00.00.00.0

us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, zions:AmegyCorporation


Period End2020-06-302019-06-30
Value4783
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic57.332.4
Percentage of InterestAndDividendIncomeOperating7.912.1
Percentage of InterestAndDividendIncomeOperating us-gaap:OperatingSegments zions:AmegyCorporation0.00.0
us-gaap:OperatingSegments, zions:CaliforniaBankAndTrust


Period End2020-06-302019-06-30
Value2265
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic26.825.4
Percentage of InterestAndDividendIncomeOperating3.79.5
Percentage of InterestAndDividendIncomeOperating us-gaap:OperatingSegments zions:CaliforniaBankAndTrust0.00.0
us-gaap:OperatingSegments, zions:CommerceBankOfWashington


Period End2020-06-302019-06-30
Value48
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic4.93.1
Percentage of InterestAndDividendIncomeOperating0.71.2
Percentage of InterestAndDividendIncomeOperating us-gaap:OperatingSegments zions:CommerceBankOfWashington0.00.0
us-gaap:OperatingSegments, zions:NationalBankOfArizona


Period End2020-06-302019-06-30
Value1230
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic14.611.7
Percentage of InterestAndDividendIncomeOperating2.04.4
Percentage of InterestAndDividendIncomeOperating us-gaap:OperatingSegments zions:NationalBankOfArizona0.00.0
us-gaap:OperatingSegments, zions:NevadaStateBank


Period End2020-06-302019-06-30
Value-2912
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic-35.44.7
Percentage of InterestAndDividendIncomeOperating-4.91.8
Percentage of InterestAndDividendIncomeOperating us-gaap:OperatingSegments zions:NevadaStateBank0.00.0
us-gaap:OperatingSegments, zions:VectraBankColorado


Period End2020-06-302019-06-30
Value1513
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic18.35.1
Percentage of InterestAndDividendIncomeOperating2.51.9
Percentage of InterestAndDividendIncomeOperating us-gaap:OperatingSegments zions:VectraBankColorado0.00.0
us-gaap:OperatingSegments, zions:ZionsBank


Period End2020-06-302019-06-30
Value4377
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic52.430.1
Percentage of InterestAndDividendIncomeOperating7.211.3
Percentage of InterestAndDividendIncomeOperating us-gaap:OperatingSegments zions:ZionsBank0.00.0

us-gaap:StatementBusinessSegments

us-gaap:Corporate


Period End2020-03-312019-12-312019-09-302019-03-312018-12-312018-09-30
Value16235288274290292
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating2.636.342.540.644.246.3
Percentage of InterestAndDividendIncomeOperating us-gaap:Corporate0.00.00.00.00.00.0

Income Loss From Continuing Operations Before Income Taxes Domestic

us-gaap:IncomeTaxExpenseBenefit



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value162526658616469567013783804569646041444055143536956614360605151595437-31-22-28
Percentage of IncomeTaxExpenseBenefit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating2.70.38.09.78.59.09.810.99.211.924.414.914.38.713.813.212.48.79.58.91.211.49.511.515.112.012.98.712.511.89.89.910.79.76.7-5.4-3.9-4.9

us-gaap:DerivativeInstrumentRisk, us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents

us-gaap:InterestRateContract, us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:AociIncludingPortionAttributableToNoncontrollingInterest


Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value10-1000
Percentage of IncomeTaxExpenseBenefit50.00.0-1.70.00.00.0
Percentage of InterestAndDividendIncomeOperating0.20.0-0.10.00.00.0
Percentage of InterestAndDividendIncomeOperating us-gaap:InterestRateContract us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome us-gaap:AociIncludingPortionAttributableToNoncontrollingInterest0.00.00.00.00.00.0

Income Tax Expense Benefit

us-gaap:IncomeTaxesPaidNet



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value1615447134-265519014084128-6605210103189201581220321203679-21000028-352
Percentage of IncomeTaxesPaidNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating2.70.28.36.919.6-0.39.98.114.90.27.115.122.9-1.212.010.720.8-0.06.61.920.3-0.10.412.726.5-0.06.924.40.713.21.9-4.10.00.1-0.0-0.04.8-60.8

Income Taxes Paid Net

us-gaap:ProfitLoss



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value66141832221982132262231972381241601681391371271139010210013928195119101-4111183110571099189881087252-72-47-113-63
Percentage of ProfitLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating11.12.328.332.828.931.634.535.332.540.422.128.730.127.027.425.923.419.021.622.13.120.517.720.825.821.6-8.523.616.822.811.621.317.617.116.519.613.09.5-12.6-8.2-19.4-10.9

us-gaap:StatementEquityComponents

us-gaap:Parent


Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value14183222198213226223197
Percentage of ProfitLoss100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating2.328.332.828.931.634.535.332.5
Percentage of InterestAndDividendIncomeOperating us-gaap:Parent0.00.00.00.00.00.00.00.0
us-gaap:RetainedEarnings


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-312010-03-31
Value661418322219821322622319723812316116913913712711390102100139281951191011108952-60
Percentage of ProfitLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.099.2100.6100.6100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.3100.3100.495.4
Percentage of InterestAndDividendIncomeOperating11.12.328.332.828.931.634.535.332.540.421.928.930.327.027.425.923.419.021.622.13.120.517.720.825.821.622.817.19.6-10.4
Percentage of InterestAndDividendIncomeOperating us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Profit Loss

us-gaap:ComprehensiveIncomeNetOfTax



Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-31
Value16223024534634117814811015223015011314913364119931056412112814710111514915187110246714
Percentage of ComprehensiveIncomeNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating27.237.036.250.650.528.224.418.727.341.229.123.230.728.113.726.120.623.414.026.527.731.621.523.430.929.416.821.04.512.12.7

Comprehensive Income Net Of Tax

us-gaap:OtherComprehensiveIncomeLossNetOfTax



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-31
Value96216-623148128111-45-49-128-82-86211-131-133542-37187913-1725846-9323941-420
Percentage of OtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating16.134.7-0.93.421.619.016.9-7.1-8.1-21.7-14.6-1.411.12.1-26.2-2.87.39.0-7.94.017.52.9-3.75.61.910.0-2.16.68.18.0-0.93.9

us-gaap:RetirementPlanType

us-gaap:OtherPensionPlansDefinedBenefit


Period End2020-03-312019-09-302019-06-302019-03-312018-09-30
Value14720115122-46
Percentage of OtherComprehensiveIncomeLossNetOfTax68.187.077.795.3102.2
Percentage of InterestAndDividendIncomeOperating23.63.016.818.1-7.3
Percentage of InterestAndDividendIncomeOperating us-gaap:OtherPensionPlansDefinedBenefit0.00.00.00.00.0
us-gaap:OtherPensionPlansPostretirementOrSupplementalPlansDefinedBenefit


Period End2020-03-312019-09-302019-06-302019-03-312018-09-30
Value6943260
Percentage of OtherComprehensiveIncomeLossNetOfTax31.917.421.64.7-0.0
Percentage of InterestAndDividendIncomeOperating11.10.64.70.90.0
Percentage of InterestAndDividendIncomeOperating us-gaap:OtherPensionPlansPostretirementOrSupplementalPlansDefinedBenefit0.00.00.00.00.0

us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-31
Value96216-624147128111-46-48-128-57-86211-131-133542-37187913-17258463920
Percentage of OtherComprehensiveIncomeLossNetOfTax100.0100.0100.0104.399.3100.0100.0102.298.0100.069.5100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating16.134.7-0.93.521.519.016.9-7.3-7.9-21.7-10.1-1.411.12.1-26.2-2.87.39.0-7.94.017.52.9-3.75.61.910.08.13.9
Percentage of InterestAndDividendIncomeOperating us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
us-gaap:Parent


Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value216-624147128111-46-48
Percentage of OtherComprehensiveIncomeLossNetOfTax100.0100.0104.399.3100.0100.0102.298.0
Percentage of InterestAndDividendIncomeOperating34.7-0.93.521.519.016.9-7.3-7.9
Percentage of InterestAndDividendIncomeOperating us-gaap:Parent0.00.00.00.00.00.00.00.0

Other Comprehensive Income Loss Net Of Tax

us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value57617421418920521721518723111415215412912411690788884-175667910476-5920955883562552544652914-110-80-135-86
Percentage of NetIncomeLossAvailableToCommonStockholdersBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating9.61.026.931.627.630.433.134.130.939.220.327.327.625.024.923.818.616.618.618.5-0.216.814.517.222.616.3-12.144.311.218.27.112.110.74.98.211.85.22.7-19.2-13.8-23.2-14.9

Net Income Loss Available To Common Stockholders Basic

us-gaap:NetIncomeLossAvailableToCommonStockholdersDiluted



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value567171213188204215214186229113151153
Percentage of NetIncomeLossAvailableToCommonStockholdersDiluted100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating9.41.126.431.527.530.232.833.930.738.920.127.127.4

Net Income Loss Available To Common Stockholders Diluted

us-gaap:Assets



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-31
Value76447714676917270361700656919568746667316645766481662886556465446654636323961038596425917959669584105836557555572085545855111560805603155188549045411055511530875340752896531495153151361508075103451047521475171251123
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Assets

us-gaap:Liabilities



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-31
Value68872639956181962852624666160761168591785883658837586095780357697577335560453359520165155452162507725083550101498394813648411494944956648855480444775949463471684691746509461654461244448440634438744553457264585645412
Percentage of Liabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets90.189.589.489.389.289.089.088.788.588.588.488.288.288.287.987.487.287.187.486.987.187.087.186.887.888.388.588.587.588.389.188.987.887.986.986.686.586.787.087.387.788.788.8

Liabilities

us-gaap:LiabilitiesAndStockholdersEquity



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-31
Value76447714676917270361700656919568746667316645766481662886556465446654636323961038596425917959669584105836557555572085545855111560805603155188549045411055511530875340752896531495153151361508075103451047521475171251123
Percentage of LiabilitiesAndStockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Liabilities And Stockholders Equity

us-gaap:StockholdersEquity



Period End2020-06-302020-03-312019-12-312019-06-302019-03-312018-12-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-31
Value75757472735375997588757864646332686063556052592164916389698569206914674566486495642158425692
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets9.910.510.610.811.011.011.511.512.511.710.911.212.212.113.113.413.513.313.012.712.311.311.1

us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome


Period End2020-06-302020-03-312019-12-312019-06-302019-03-312018-12-31
Value3552594325-122-250
Percentage of StockholdersEquity4.73.50.60.3-1.6-3.3
Percentage of Assets0.50.40.10.0-0.2-0.4
Percentage of Assets us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.0
us-gaap:AdditionalPaidInCapital


Period End2020-06-302020-03-312019-12-312019-06-302019-03-312018-12-31
Value267526682735327135413806
Percentage of StockholdersEquity35.335.737.243.046.750.2
Percentage of Assets3.53.74.04.75.15.5
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.0
us-gaap:RetainedEarnings


Period End2020-06-302020-03-312019-12-312019-06-302019-03-312018-12-31
Value397939794009373736033456
Percentage of StockholdersEquity52.553.354.549.247.545.6
Percentage of Assets5.25.65.85.35.25.0
Percentage of Assets us-gaap:RetainedEarnings0.00.00.00.00.00.0

Stockholders Equity

us-gaap:PropertyPlantAndEquipmentNet



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-31
Value117311441142114611331125112411111099109810941083106910471019986955925905873856844829811803785726720717706708709714715719726722721720719705707710
Percentage of PropertyPlantAndEquipmentNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.51.61.71.61.61.61.61.71.71.71.71.71.61.61.61.61.61.61.51.51.51.51.51.51.51.41.31.31.31.31.31.31.31.41.41.41.41.41.41.41.41.41.4

Property Plant And Equipment Net

us-gaap:IntangibleAssetsNetIncludingGoodwill



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value1014101410141014101410141015101510151016
Percentage of IntangibleAssetsNetIncludingGoodwill100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.31.41.51.41.41.51.51.51.51.5

Intangible Assets Net Including Goodwill

us-gaap:DeferredTaxAssetsLiabilitiesNet



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302014-12-312013-12-312012-12-312011-12-312010-12-31
Value2263734367313017014912393207198231250170164180203201224304405509540
Percentage of DeferredTaxAssetsLiabilitiesNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.10.00.10.10.20.30.20.20.10.30.30.40.40.30.30.30.30.30.40.50.71.01.1

Deferred Tax Assets Liabilities Net

us-gaap:LongTermDebt



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-31
Value13531795172312421236122872487938338338338338338353457069880281794410501089109211131933215822732304217323522337232622742283195418981879191319421939193420162032
Percentage of LongTermDebt100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.82.52.51.81.81.81.11.30.60.60.60.60.60.60.80.91.21.41.41.61.81.91.92.03.53.84.14.24.04.34.24.44.34.33.73.73.73.83.83.83.73.94.0

us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:FairValueInputsLevel2


Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value17951723124212361228724879383
Percentage of LongTermDebt100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets2.52.51.81.81.81.11.30.6
Percentage of Assets us-gaap:FairValueInputsLevel20.00.00.00.00.00.00.00.0

us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis

us-gaap:FairValueInputsLevel2, us-gaap:CarryingReportedAmountFairValueDisclosure


Period End2020-06-302019-12-31
Value13531723
Percentage of LongTermDebt100.0100.0
Percentage of Assets1.82.5
Percentage of Assets us-gaap:FairValueInputsLevel2 us-gaap:CarryingReportedAmountFairValueDisclosure0.00.0
us-gaap:FairValueInputsLevel2, us-gaap:EstimateOfFairValueFairValueDisclosure


Period End2020-06-302019-12-31
Value13201751
Percentage of LongTermDebt97.6101.6
Percentage of Assets1.72.5
Percentage of Assets us-gaap:FairValueInputsLevel2 us-gaap:EstimateOfFairValueFairValueDisclosure0.00.0

us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FinancialInstrument

us-gaap:FairValueInputsLevel2, us-gaap:EstimateOfFairValueFairValueDisclosure


Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value17051751125512481240727885402
Percentage of LongTermDebt95.0101.6101.0101.0101.0100.4100.7105.0
Percentage of Assets2.42.51.81.81.81.11.30.6
Percentage of Assets us-gaap:FairValueInputsLevel2 us-gaap:EstimateOfFairValueFairValueDisclosure0.00.00.00.00.00.00.00.0

Long Term Debt

us-gaap:StockholdersEquity



Period End2020-06-302020-03-312019-12-312019-06-302019-03-312018-12-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-31
Value75757472735375997588757864646332686063556052592164916389698569206914674566486495642158425692
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets9.910.510.610.811.011.011.511.512.511.710.911.212.212.113.113.413.513.313.012.712.311.311.1

us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome


Period End2020-06-302020-03-312019-12-312019-06-302019-03-312018-12-31
Value3552594325-122-250
Percentage of StockholdersEquity4.73.50.60.3-1.6-3.3
Percentage of Assets0.50.40.10.0-0.2-0.4
Percentage of Assets us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.0
us-gaap:AdditionalPaidInCapital


Period End2020-06-302020-03-312019-12-312019-06-302019-03-312018-12-31
Value267526682735327135413806
Percentage of StockholdersEquity35.335.737.243.046.750.2
Percentage of Assets3.53.74.04.75.15.5
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.0
us-gaap:RetainedEarnings


Period End2020-06-302020-03-312019-12-312019-06-302019-03-312018-12-31
Value397939794009373736033456
Percentage of StockholdersEquity52.553.354.549.247.545.6
Percentage of Assets5.25.65.85.35.25.0
Percentage of Assets us-gaap:RetainedEarnings0.00.00.00.00.00.0

Stockholders Equity

us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest



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
Value74727353750975997588757875537621764476797761774977307634767976267625750776387530745473697322670065866464633268606350604859186489638669836918691367446647649464215856571065295323
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets10.510.610.710.811.011.011.311.511.511.611.811.811.812.112.612.812.912.613.112.913.012.913.212.211.711.511.512.511.710.911.112.212.113.113.413.513.313.012.712.311.311.20.00.0

us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome


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
Value259434925-122-250-361-315-267-139-57-49-111-1211023-11-54-16-35-114-128-110-136-145-192-384-374-406-446-534-576-571-592-588-504-499-461-452-433-428-436-98-58
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest3.50.60.70.3-1.6-3.3-4.8-4.1-3.5-1.8-0.7-0.6-1.4-1.60.10.3-0.2-0.7-0.2-0.5-1.5-1.7-1.5-2.0-2.2-3.0-6.1-5.5-6.4-7.4-9.0-8.9-8.9-8.5-8.5-7.3-7.4-6.9-7.0-6.7-7.3-7.7-1.5-1.1
Percentage of Assets0.40.10.10.0-0.2-0.4-0.5-0.5-0.4-0.2-0.1-0.1-0.2-0.20.00.0-0.0-0.1-0.0-0.1-0.2-0.2-0.2-0.2-0.3-0.3-0.7-0.7-0.8-0.8-1.0-1.1-1.1-1.1-1.1-1.0-1.0-0.9-0.9-0.8-0.8-0.90.00.0
Percentage of Assets us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
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
Value00000004231434644454552466046964724474747834777476647564738472847234717419241854179417241674170416641624157416241634160415841784163407039643517331825992212
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest0.00.00.00.00.00.00.055.556.957.958.760.160.861.961.862.762.763.562.362.963.464.164.462.663.564.665.960.865.768.970.364.165.259.660.160.262.062.662.761.760.158.139.841.6
Percentage of Assets0.00.00.00.00.00.00.06.46.56.76.97.17.27.57.88.08.18.08.18.18.28.38.57.67.57.57.67.67.77.57.87.87.97.88.18.18.28.28.07.66.86.50.00.0
Percentage of Assets us-gaap:CommonStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
us-gaap:Parent


Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-31
Value74727353750975997588757875537621764476797634
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets10.510.610.710.811.011.011.311.511.511.612.1
Percentage of Assets us-gaap:Parent0.00.00.00.00.00.00.00.00.00.00.0
us-gaap:PreferredStock


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
Value5665665665665665665665665665665665667107097097098288281004100410041004100410041003100310031728130111281123180017372377235423292162205618751806153215021581240
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest7.67.77.57.47.57.57.57.47.47.47.37.39.29.39.29.310.911.013.113.313.513.613.715.015.215.515.925.220.518.719.027.727.234.034.033.732.130.928.928.126.226.324.24.5
Percentage of Assets0.80.80.80.80.80.80.80.90.90.90.90.91.11.11.21.21.41.41.71.71.71.81.81.81.81.81.83.12.42.02.13.43.34.54.64.54.34.03.73.53.02.90.00.0
Percentage of Assets us-gaap:PreferredStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
us-gaap:RetainedEarnings


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
Value3979400938923737360334563296313929992807270025722435232122112110203119661894182318361769171116401542147315401338129012031170111010601036994931904889100110831220130824182899
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest53.354.551.849.247.545.643.641.239.236.634.833.231.530.428.827.726.626.224.824.224.624.023.424.523.422.824.319.520.319.919.817.116.614.814.413.513.413.415.416.920.822.937.054.5
Percentage of Assets5.65.85.55.35.25.04.94.74.54.24.13.93.73.73.63.53.43.33.23.13.23.13.13.02.72.62.82.42.42.22.22.12.02.01.91.81.81.72.02.12.42.60.00.0
Percentage of Assets us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Stockholders Equity Including Portion Attributable To Noncontrolling Interest

us-gaap:AdditionalPaidInCapital



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value267526682735300232713541380640520
Percentage of AdditionalPaidInCapital100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets3.53.74.04.34.75.15.56.10.0

us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital


Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value2668273530023271354138064052000
Percentage of AdditionalPaidInCapital100.0100.0100.0100.0100.0100.0100.00.00.0100.0
Percentage of Assets3.74.04.34.75.15.56.10.00.00.0
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.0

Additional Paid In Capital

us-gaap:RetainedEarningsAccumulatedDeficit



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-31
Value397939794009389237373603345632963139299928072700257224352321221121102031196618941823183617691711164015421473154013381290120311701110106010369949319048891001108312201308
Percentage of RetainedEarningsAccumulatedDeficit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets5.25.65.85.55.35.25.04.94.74.54.24.13.93.73.73.63.53.43.33.23.13.23.13.13.02.72.62.82.42.42.22.22.12.02.01.91.81.81.72.02.12.42.6

Retained Earnings Accumulated Deficit

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-31
Value355259434925-122-250-361-315-267-139-57-49-111-1211023-11-54-16-35-114-128-110-136-145-192-384-374-406-446-534-576-571-592-588-504-499-461-452-433-428-436-98
Percentage of AccumulatedOtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.50.40.10.10.0-0.2-0.4-0.5-0.5-0.4-0.2-0.1-0.1-0.2-0.20.00.0-0.0-0.1-0.0-0.1-0.2-0.2-0.2-0.2-0.3-0.3-0.7-0.7-0.8-0.8-1.0-1.1-1.1-1.1-1.1-1.0-1.0-0.9-0.9-0.8-0.8-0.90.0

us-gaap:RetirementPlanType

us-gaap:OtherPensionPlansDefinedBenefit


Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value17629299-106228-335-289-114
Percentage of AccumulatedOtherComprehensiveIncomeLossNetOfTax68.067.459.236.086.9-91.292.891.782.0
Percentage of Assets0.20.00.00.0-0.20.3-0.5-0.4-0.2
Percentage of Assets us-gaap:OtherPensionPlansDefinedBenefit0.00.00.00.00.00.00.00.00.0
us-gaap:OtherPensionPlansPostretirementOrSupplementalPlansDefinedBenefit


Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value972841375-1-3-3-2
Percentage of AccumulatedOtherComprehensiveIncomeLossNetOfTax37.565.183.7148.0-4.10.40.81.01.4
Percentage of Assets0.10.00.10.10.0-0.0-0.0-0.0-0.0
Percentage of Assets us-gaap:OtherPensionPlansPostretirementOrSupplementalPlansDefinedBenefit0.00.00.00.00.00.00.00.00.0
us-gaap:PensionPlansDefinedBenefit


Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value-14-14-21-21-21-21-23-23-23
Percentage of AccumulatedOtherComprehensiveIncomeLossNetOfTax-5.4-32.6-42.9-84.017.28.46.47.316.5
Percentage of Assets-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0
Percentage of Assets us-gaap:PensionPlansDefinedBenefit0.00.00.00.00.00.00.00.00.0

us-gaap:StatementEquityComponents

us-gaap:AccumulatedDefinedBenefitPlansAdjustment


Period End2020-06-302019-12-312019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302011-12-31
Value-1-14-21-21-21-23-23-23-22-31-31-31-30-38-38-38-37-38-38-38-38-24-24-24-24-50-50-50-50-54-54-54
Percentage of AccumulatedOtherComprehensiveIncomeLossNetOfTax-0.3-32.6-84.017.28.46.47.38.615.854.463.327.925.3-384.5-162.6330.069.2225.9109.033.429.922.418.217.112.913.113.412.411.310.29.59.2
Percentage of Assets-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.0-0.0-0.0-0.0-0.1-0.1-0.1-0.1-0.1-0.1-0.1
Percentage of Assets us-gaap:AccumulatedDefinedBenefitPlansAdjustment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
us-gaap:AccumulatedGainLossNetCashFlowHedgeParent


Period End2020-06-302019-12-312019-06-302018-12-31
Value862837-1
Percentage of AccumulatedOtherComprehensiveIncomeLossNetOfTax24.265.1148.00.4
Percentage of Assets0.10.00.1-0.0
Percentage of Assets us-gaap:AccumulatedGainLossNetCashFlowHedgeParent0.00.00.00.0
us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss


Period End2020-06-302019-12-312019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302011-12-31
Value270299-106-228-335-289-240-114-28-20-81-92354613-189-1-80-91-87-112-120-167-334-324-357-397-483-525-546
Percentage of AccumulatedOtherComprehensiveIncomeLossNetOfTax76.167.436.086.991.292.891.789.982.049.140.873.076.0358.9197.1-118.333.6-54.95.669.971.878.782.482.887.087.186.787.889.190.391.392.3
Percentage of Assets0.40.00.0-0.2-0.3-0.5-0.4-0.4-0.2-0.0-0.0-0.1-0.10.10.10.0-0.00.0-0.0-0.1-0.2-0.2-0.2-0.2-0.3-0.6-0.6-0.7-0.7-0.9-1.0-1.0
Percentage of Assets us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
us-gaap:AccumulatedOtherComprehensiveIncome


Period End2020-06-302019-12-312019-06-302018-12-31
Value3554325-250
Percentage of AccumulatedOtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0
Percentage of Assets0.50.10.0-0.4
Percentage of Assets us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.0

Accumulated Other Comprehensive Income Loss Net Of Tax

us-gaap:NetCashProvidedByUsedInOperatingActivities



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value245153351126262-42351387163275125227195380133228112221482128588116198121262723112109326024821534626937288670
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating41.224.654.318.638.3-6.253.561.326.946.722.240.834.973.826.646.52.446.931.446.618.719.825.343.12.727.157.663.143.418.250.347.438.962.048.764.015.1115.6

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value-5176-2125978112-80287-1967-410100-429-842-24-173-2880-1957-1456-158136-1156-271-810-413-1444-1147117575-240-669399313-567-63-260-65528753-528-1648
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating-869.9-341.6151.216.5-117.312.9-299.8-65.016.5-72.8-149.8-4.3-31.0-559.2-390.0-296.8-32.628.7-244.2-59.5-177.9-92.1-312.6-249.4253.816.2-50.9-135.682.560.9-109.6-12.2-47.0-117.45.2129.4-90.6-284.1

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value4771199754220542-123171372-26576724-143-107232920081221189-6391203-967622031584154-1145-36150612-1523-471349-326112395-272-1133464652
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating801.8321.183.83.079.2-18.2261.111.4-43.712.9128.8-25.7-19.2452.2400.2248.938.9-134.6254.1-21.2167.545.3343.033.5-247.3-7.731.8124.1-314.2-91.567.5-62.320.370.8-49.4-194.879.5112.5

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value245153351126262-42351387163275125227195380133228112221482128588116198121262723112109326024821534626937288670
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating41.224.654.318.638.3-6.253.561.326.946.722.240.834.973.826.646.52.446.931.446.618.719.825.343.12.727.157.663.143.418.250.347.438.962.048.764.015.1115.6

Net Cash Provided By Used In Operating Activities

us-gaap:ProfitLoss



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value66141832221982132262231972381241601681391371271139010210013928195119101-4111183110571099189881087252-72-47-113-63
Percentage of ProfitLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating11.12.328.332.828.931.634.535.332.540.422.128.730.127.027.425.923.419.021.622.13.120.517.720.825.821.6-8.523.616.822.811.621.317.617.116.519.613.09.5-12.6-8.2-19.4-10.9

us-gaap:StatementEquityComponents

us-gaap:Parent


Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value14183222198213226223197
Percentage of ProfitLoss100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating2.328.332.828.931.634.535.332.5
Percentage of InterestAndDividendIncomeOperating us-gaap:Parent0.00.00.00.00.00.00.00.0
us-gaap:RetainedEarnings


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-312010-03-31
Value661418322219821322622319723812316116913913712711390102100139281951191011108952-60
Percentage of ProfitLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.099.2100.6100.6100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.3100.3100.495.4
Percentage of InterestAndDividendIncomeOperating11.12.328.332.828.931.634.535.332.540.421.928.930.327.027.425.923.419.021.622.13.120.517.720.825.821.622.817.19.6-10.4
Percentage of InterestAndDividendIncomeOperating us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Profit Loss

us-gaap:DeferredIncomeTaxExpenseBenefit



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value-48-460-5-12154-6-1113150-4-51301-6-421-10-44332-58785-716019413353-21-15-36
Percentage of DeferredIncomeTaxExpenseBenefit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Deferred Income Tax Expense Benefit

us-gaap:ShareBasedCompensation



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value51345414445134451246511
Percentage of ShareBasedCompensation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Share Based Compensation

us-gaap:NetCashProvidedByUsedInInvestingActivities



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value-5176-2125978112-80287-1967-410100-429-842-24-173-2880-1957-1456-158136-1156-271-810-413-1444-1147117575-240-669399313-567-63-260-65528753-528-1648
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating-869.9-341.6151.216.5-117.312.9-299.8-65.016.5-72.8-149.8-4.3-31.0-559.2-390.0-296.8-32.628.7-244.2-59.5-177.9-92.1-312.6-249.4253.816.2-50.9-135.682.560.9-109.6-12.2-47.0-117.45.2129.4-90.6-284.1

Net Cash Provided By Used In Investing Activities

us-gaap:PaymentsToAcquirePropertyPlantAndEquipment



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value5428233435253936262836394450525151405138333336263576202615151715221920251715
Percentage of PaymentsToAcquirePropertyPlantAndEquipment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Payments To Acquire Property Plant And Equipment

us-gaap:NetCashProvidedByUsedInFinancingActivities



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value4771199754220542-123171372-26576724-143-107232920081221189-6391203-967622031584154-1145-36150612-1523-471349-326112395-272-1133464652
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating801.8321.183.83.079.2-18.2261.111.4-43.712.9128.8-25.7-19.2452.2400.2248.938.9-134.6254.1-21.2167.545.3343.033.5-247.3-7.731.8124.1-314.2-91.567.5-62.320.370.8-49.4-194.879.5112.5

Net Cash Provided By Used In Financing Activities

us-gaap:PaymentsOfDividends



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value6466646961666468554940342629263022272827292324232423343524323540404034292122
Percentage of PaymentsOfDividends100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Payments Of Dividends

us-gaap:PaymentsOfDividends



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value6466646961666468554940342629263022272827292324232423343524323540404034292122
Percentage of PaymentsOfDividends100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Payments Of Dividends

us-gaap:PaymentsForRepurchaseOfCommonStock



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-30
Value175276275275276250186126122115115525052455160
Percentage of PaymentsForRepurchaseOfCommonStock100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Payments For Repurchase Of Common Stock

us-gaap:DebtInstrumentInterestRateStatedPercentage



Period End2023-09-152018-11-152013-10-312013-09-12
Value0.0390.0420.0570.07
Percentage of DebtInstrumentInterestRateStatedPercentage100.0100.0100.0100.0
Percentage of LongTermDebtAndCapitalLeaseObligations0.00.00.00.0

us-gaap:DebtInstrument, us-gaap:LongtermDebtType

zions:A335SeniorNotes, us-gaap:SeniorNotes


Period End2020-06-30
Value0.0335
Percentage of DebtInstrumentInterestRateStatedPercentage0.0
Percentage of LongTermDebtAndCapitalLeaseObligations0.0
Percentage of LongTermDebtAndCapitalLeaseObligations zions:A335SeniorNotes us-gaap:SeniorNotes0.0
zions:A335SeniorNotes, us-gaap:SubordinatedDebt


Period End2020-06-30
Value0.0325
Percentage of DebtInstrumentInterestRateStatedPercentage0.0
Percentage of LongTermDebtAndCapitalLeaseObligations0.0
Percentage of LongTermDebtAndCapitalLeaseObligations zions:A335SeniorNotes us-gaap:SubordinatedDebt0.0
zions:A350SeniorNotes, us-gaap:SeniorNotes


Period End2020-06-30
Value0.035
Percentage of DebtInstrumentInterestRateStatedPercentage0.0
Percentage of LongTermDebtAndCapitalLeaseObligations0.0
Percentage of LongTermDebtAndCapitalLeaseObligations zions:A350SeniorNotes us-gaap:SeniorNotes0.0

Debt Instrument Interest Rate Stated Percentage

us-gaap:EffectiveIncomeTaxRateContinuingOperations



Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-30
Value0.1950.1250.2290.2270.2230.2360.2210.2270.3420.3230.2450.3370.3460.3140.28760.2830.3570.3564
Percentage of EffectiveIncomeTaxRateContinuingOperations100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Effective Income Tax Rate Continuing Operations

us-gaap:OperatingLeaseRightOfUseAsset



Period End2020-06-302020-03-312019-12-312019-09-302019-06-30
Value209211218231232
Percentage of OperatingLeaseRightOfUseAsset100.0100.0100.0100.0100.0

Operating Lease Right Of Use Asset

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents



Period End2020-06-302019-12-312019-06-302018-12-31
Value570705538614
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents100.0100.0100.0100.0

Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents

us-gaap:ProceedsFromRepaymentsOfShortTermDebt



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value-290617124674-14451080-7091873-377-709-10852-7182052311-28884538-114744523-4052-66-21-6017-70-25-392318-168-34-19080-17511229
Percentage of ProceedsFromRepaymentsOfShortTermDebt100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Proceeds From Repayments Of Short Term Debt

us-gaap:AdvertisingExpense



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value33265568755665555556665666655765656556
Percentage of AdvertisingExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AllowanceForLoanAndLeaseLossRecoveryOfBadDebts



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-30
Value56101091221182521151728111023191132111937-109151712-14-29172030
Percentage of AllowanceForLoanAndLeaseLossRecoveryOfBadDebts100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable

us-gaap:CommercialPortfolioSegment


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-30
Value3467661812201810121866141471641320-668106-6-1371211
Percentage of AllowanceForLoanAndLeaseLossRecoveryOfBadDebts60.066.760.070.066.750.085.766.780.085.766.770.664.354.560.561.974.259.851.440.168.755.661.057.261.453.143.644.641.759.536.4
us-gaap:CommercialRealEstatePortfolioSegment


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-30
Value002103133222821622134314-21332-2-12536
Percentage of AllowanceForLoanAndLeaseLossRecoveryOfBadDebts0.00.020.010.00.025.04.816.712.09.513.311.828.618.216.929.210.625.342.137.315.438.119.321.517.620.221.141.430.116.421.8
us-gaap:ConsumerPortfolioSegment


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-30
Value2222332321332322212232-19322-3-3333
Percentage of AllowanceForLoanAndLeaseLossRecoveryOfBadDebts40.033.320.020.033.325.09.516.78.04.820.017.67.127.322.58.815.314.86.522.715.96.317.719.517.117.122.010.622.316.112.9

us-gaap:AllowanceForLoanAndLeaseLossesAdjustmentsNet



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-31
Value317221140-8-1-12-5-12-8-7-46-26-29-38-36-13-31-1116-17-10-6-7-8-5-17-38-43-54-101-112-141
Percentage of AllowanceForLoanAndLeaseLossesAdjustmentsNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable

us-gaap:CommercialPortfolioSegment


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-30
Value28618-1132-10-4-10-2-10-4-13-45-24-33-32-36-17-32-104-19-9-4-2-5-5-10-14-20
Percentage of AllowanceForLoanAndLeaseLossesAdjustmentsNet90.385.781.8-100.092.9100.0125.0400.083.340.083.350.0185.797.891.8111.184.499.6130.7104.190.927.6112.888.571.728.861.095.160.237.447.4
us-gaap:CommercialRealEstatePortfolioSegment


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-30
Value001-10-2-12-32-1-27105-5253013100-5-26-1-16-16
Percentage of AllowanceForLoanAndLeaseLossesAdjustmentsNet0.00.04.5-100.00.0100.012.5-200.025.0-40.08.325.0-100.0-2.21.5-19.615.2-5.6-38.2-9.97.979.9-11.6-0.1-1.066.431.6-107.210.843.937.4
us-gaap:ConsumerPortfolioSegment


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-30
Value313310311-5-1-2-1-2-1-20-20-10-1-10-10-2-5-6-8-13
Percentage of AllowanceForLoanAndLeaseLossesAdjustmentsNet9.714.313.6300.07.1100.0-37.5-100.0-8.3100.08.325.014.34.36.68.50.45.97.55.81.1-7.55.80.321.211.627.9105.533.721.130.9

us-gaap:AllowanceForLoanAndLeaseLossesWriteOffs



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-31
Value3613321123-12-13-17-132627253557375357484542312035262320223535587380129142167
Percentage of AllowanceForLoanAndLeaseLossesWriteOffs100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable

us-gaap:CommercialPortfolioSegment


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-30
Value311024619-8-8-8-10202016315131484643333623153318159111818-26-31
Percentage of AllowanceForLoanAndLeaseLossesWriteOffs86.176.975.054.582.666.761.547.176.976.974.164.088.689.582.889.380.989.974.387.376.779.094.770.264.143.950.252.751.0-45.0-42.9
us-gaap:CommercialRealEstatePortfolioSegment


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-30
Value00300-10-5003411217081301327567-20-22
Percentage of AllowanceForLoanAndLeaseLossesWriteOffs0.00.09.40.00.08.3-0.029.4-0.00.011.116.02.91.86.02.013.62.018.92.512.73.13.312.512.737.825.117.420.4-34.5-31.0
us-gaap:ConsumerPortfolioSegment


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-30
Value53554-3-5-4-364535443334334343599-11-17
Percentage of AllowanceForLoanAndLeaseLossesWriteOffs13.923.115.645.517.425.038.523.523.123.114.820.08.68.811.28.75.58.16.810.210.617.911.611.618.215.024.225.928.0-19.4-23.5

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecurities

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount

us-gaap:RestrictedStockUnitsRSU


Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value1011111
Percentage of AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount100.0100.0100.0100.0100.0100.0100.0
zions:StockOptions


Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value0000000
Percentage of AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount71.0122.244.234.023.011.411.4

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect



Period End2020-06-302020-03-312019-06-302019-03-31
Value-160252-78
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect100.0100.0100.0100.0

us-gaap:CommonStockDividendsPerShareDeclared



Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value0.340.340.340.30.30.30.240.20.120000000000000020.080.08
Percentage of CommonStockDividendsPerShareDeclared100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DebtAndEquitySecuritiesGainLoss



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value-4-632-312-11015
Percentage of DebtAndEquitySecuritiesGainLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DefinedBenefitPlanAmortizationOfGainsLosses



Period End2020-06-302019-06-302017-03-312016-03-31
Value0-1-1-2
Percentage of DefinedBenefitPlanAmortizationOfGainsLosses100.0100.0100.0100.0

us-gaap:RetirementPlanType

us-gaap:PensionPlansDefinedBenefit


Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value01-1-1-100-108-1-1-111-1-2
Percentage of DefinedBenefitPlanAmortizationOfGainsLosses0.00.00.0100.00.00.00.00.00.00.00.00.0100.00.00.00.0

us-gaap:DefinedBenefitPlanExpectedReturnOnPlanAssets



Period End2020-06-302019-06-302017-03-312016-03-31
Value1233
Percentage of DefinedBenefitPlanExpectedReturnOnPlanAssets100.0100.0100.0100.0

us-gaap:RetirementPlanType

us-gaap:PensionPlansDefinedBenefit


Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value232222333-20333-2033
Percentage of DefinedBenefitPlanExpectedReturnOnPlanAssets0.00.00.0100.00.00.00.00.00.00.00.00.0100.00.00.00.0

us-gaap:DefinedBenefitPlanInterestCost



Period End2020-06-302019-06-302017-03-312016-03-31
Value0122
Percentage of DefinedBenefitPlanInterestCost100.0100.0100.0100.0

us-gaap:RetirementPlanType

us-gaap:PensionPlansDefinedBenefit


Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value1111121111222222
Percentage of DefinedBenefitPlanInterestCost0.00.00.0100.00.00.00.00.00.00.00.00.0100.00.00.00.0

us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost



Period End2020-06-302019-06-302017-03-312016-03-31
Value27011
Percentage of DefinedBenefitPlanNetPeriodicBenefitCost100.0100.0100.0100.0

us-gaap:RetirementPlanType

us-gaap:PensionPlansDefinedBenefit


Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value0-3000-1-1-1-10111031
Percentage of DefinedBenefitPlanNetPeriodicBenefitCost0.00.00.0100.00.00.00.00.00.00.00.00.0100.00.00.00.0

us-gaap:DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1



Period End2020-06-302019-06-302017-03-312016-09-302016-03-31
Value-280-120
Percentage of DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1100.0100.0100.0100.0100.0

us-gaap:RetirementPlanType

us-gaap:PensionPlansDefinedBenefit


Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-09-302016-06-30
Value-1000-10-11-1-1-1-30
Percentage of DefinedBenefitPlanRecognizedNetGainLossDueToSettlements10.00.0100.00.00.00.00.00.00.00.0100.0-115.40.0

us-gaap:DepreciationAndAmortization



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value1845455049445249494348474737-1249454041403534313331324245464762575210589659646
Percentage of DepreciationAndAmortization100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DerivativeGainLossOnDerivativeNet



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value-12000000.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of DerivativeGainLossOnDerivativeNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

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

us-gaap:DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet

us-gaap:InterestRateFloor, us-gaap:CashFlowHedging, us-gaap:DesignatedAsHedgingInstrument


Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value331-10000
Percentage of DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet100.0100.0100.0100.0100.0100.0100.0100.0
us-gaap:InterestRateSwap, us-gaap:CashFlowHedging, us-gaap:DesignatedAsHedgingInstrument


Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value1-1-2-1-231-1
Percentage of DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet33.3-33.3-200.0100.0100.0100.0100.0100.0

us-gaap:HedgingDesignation

us-gaap:DesignatedAsHedgingInstrument


Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-31
Value42-1-22-31-102222321100000012357913
Percentage of DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet133.366.7-100.0200.0100.0100.0100.0100.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:DistributedEarnings



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value56575659545656584739322416
Percentage of DistributedEarnings100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:Dividends



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value66646667636466665747423230
Percentage of Dividends100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DividendsCommonStock



Period End2020-06-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-312010-03-31
Value565456575847403126171516161212121212888771111
Percentage of DividendsCommonStock100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementEquityComponents

us-gaap:Parent


Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value-56395-60-54-56347-58-47
Percentage of DividendsCommonStock0.00.00.0-100.0-100.0608.8-100.0-100.0
us-gaap:RetainedEarnings


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-312010-03-31
Value56-56395-60-545657-58-47403126171516161212121212888771111
Percentage of DividendsCommonStock100.00.00.00.0-100.0100.0100.0-100.0-100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DividendsPreferredStock



Period End2020-06-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-312010-03-31
Value910798107107131012101311141615161516152522383221
Percentage of DividendsPreferredStock100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementEquityComponents

us-gaap:Parent


Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value8981079810
Percentage of DividendsPreferredStock0.00.00.0100.0100.0100.0100.0100.0
us-gaap:RetainedEarnings


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-312010-03-31
Value989810798107107131012101311141615161516152522643826
Percentage of DividendsPreferredStock100.00.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0164.8116.1123.0

us-gaap:EquipmentExpense



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value3232343435323130323334323232332930323130312930282727262626272726262625252524
Percentage of EquipmentExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value15-90000
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1100.0100.0100.0100.0100.0100.0

us-gaap:FairValueByAssetClass

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases

us-gaap:PrivateEquityFunds


Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-30
Value15104321526578342487584712202413
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
us-gaap:ServicingContracts


Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value0000000000000000000000002
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases0.00.00.0100.00.00.00.00.00.00.00.00.00.00.00.00.013.18.62.92.93.44.112.05.3153.2

us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:PrivateEquityFunds, us-gaap:FairValueInputsLevel3


Period End2020-06-302019-06-30
Value20
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases0.0100.0

us-gaap:FairValueByAssetClass

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales

us-gaap:PrivateEquityFunds


Period End2020-03-312019-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-30
Value250003010019000000192-9
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueOptionChangesInFairValueGainLoss1



Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-31
Value0.00.0-1000000.0-9000000.0-4000000.0-9000000.0-1000000.0-5000000.0-1000000.0-6000000.0-2000000.0-6051000.0-15359000.0-15107000.0-8856000.0-4243000.0-6648000.0-4242000.0-1174000.0-4438000.0-4610000.0-3597000.0-6797000.0-7067000.0-7580000.0-11315000.0
Percentage of FairValueOptionChangesInFairValueGainLoss1100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FinancialInstrument

us-gaap:PrivateEquityFunds


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value0.00.00.0-1000000.00.00.00.00.00.00.00.00.0
Percentage of FairValueOptionChangesInFairValueGainLoss1100.0100.00.0100.0-0.0-0.00.0-0.0-0.0-0.00.0-0.0
zions:CollateralDependentLoans


Period End2020-06-302019-06-30
Value0.0-9000000.0
Percentage of FairValueOptionChangesInFairValueGainLoss1100.0100.0
zions:ImpairedLoans


Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value0.09000000.00.0-9000000.0-4000000.02000000.0-9000000.0-1000000.0
Percentage of FairValueOptionChangesInFairValueGainLoss1100.00.0-0.0100.0100.00.0100.0100.0

us-gaap:FederalDepositInsuranceCorporationPremiumExpense



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value756766618141313151312111197988888879109111010121524252624
Percentage of FederalDepositInsuranceCorporationPremiumExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-30
Value21-2145038231318-361960022020005128
Percentage of FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable

us-gaap:CommercialLoan


Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-30
Value1-2133015231316-561861011010003005
Percentage of FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1100.0100.0100.075.060.0100.033.362.5100.0100.0100.0100.088.9136.799.398.397.6175.91.556.442.5151.277.484.20.074.856.812.24.666.6
us-gaap:CommercialRealEstate


Period End2020-03-312019-09-302019-03-312018-09-302018-06-302018-03-312017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-30
Value002220200000100000122
Percentage of FinancingReceivableModificationsSubsequentDefaultRecordedInvestment10.00.040.066.725.00.011.10.70.00.00.038.753.00.00.025.70.00.081.495.433.4
zions:CommercialAndIndustrial


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value21-2133015
Percentage of FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1100.0100.0100.0100.075.060.0100.033.362.5
zions:OneThroughFourFamilyResidential


Period End2020-06-302019-06-30
Value01
Percentage of FinancingReceivableModificationsSubsequentDefaultRecordedInvestment10.025.0
zions:Term


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value000002022
Percentage of FinancingReceivableModificationsSubsequentDefaultRecordedInvestment10.00.0-0.00.00.040.0100.066.725.0

us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, zions:FinancialReceivables

us-gaap:CommercialLoan, zions:Nonaccruing


Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value1-2133015
Percentage of FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1100.0100.0100.075.060.0100.033.362.5
us-gaap:CommercialRealEstate, zions:Accruing


Period End2020-03-312019-09-302019-03-312018-09-30
Value0002
Percentage of FinancingReceivableModificationsSubsequentDefaultRecordedInvestment10.00.00.066.7
us-gaap:CommercialRealEstate, zions:Nonaccruing


Period End2020-03-312019-09-302019-03-312018-09-30
Value0020
Percentage of FinancingReceivableModificationsSubsequentDefaultRecordedInvestment10.00.040.00.0
zions:CommercialAndIndustrial, zions:Nonaccruing


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value21-2133015
Percentage of FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1100.0100.0100.0100.075.060.0100.033.362.5
zions:OneThroughFourFamilyResidential, zions:Nonaccruing


Period End2020-06-302019-06-30
Value01
Percentage of FinancingReceivableModificationsSubsequentDefaultRecordedInvestment10.025.0
zions:Term, zions:Accruing


Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value00000-220
Percentage of FinancingReceivableModificationsSubsequentDefaultRecordedInvestment10.00.00.00.00.0100.066.70.0
zions:Term, zions:Nonaccruing


Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value00002202
Percentage of FinancingReceivableModificationsSubsequentDefaultRecordedInvestment10.00.00.00.040.0100.00.025.0

zions:FinancialReceivables

zions:Accruing


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value000000-220
Percentage of FinancingReceivableModificationsSubsequentDefaultRecordedInvestment10.00.0-0.00.00.00.0100.066.70.0
zions:Nonaccruing


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value21-2145218
Percentage of FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1100.0100.0100.0100.0100.0100.0100.033.3100.0

us-gaap:DerivativeInstrumentRisk, us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents

us-gaap:GainLossOnDerivativeInstrumentsNetPretax

us-gaap:InterestRateContract, us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:AociIncludingPortionAttributableToNoncontrollingInterest


Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value3-1-2-1-1-1
Percentage of GainLossOnDerivativeInstrumentsNetPretax100.0100.0100.0100.0100.0100.0

dei:LegalEntity

us-gaap:GainsLossesOnSalesOfOtherRealEstate

zions:NevadaStateBank


Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value00100000
Percentage of GainsLossesOnSalesOfOtherRealEstate100.0100.0100.0100.0100.0100.0100.0100.0
zions:OtherSegment


Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value00000-100
Percentage of GainsLossesOnSalesOfOtherRealEstate100.0100.00.0100.0100.0100.0100.0100.0
zions:ZionsBank


Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value00101100
Percentage of GainsLossesOnSalesOfOtherRealEstate100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FinancialInstrument

zions:OtherRealEstateOwnedProperties


Period End2020-06-302020-03-312019-06-302019-03-312018-06-30
Value11010
Percentage of GainsLossesOnSalesOfOtherRealEstate0.0100.0100.0100.0100.0

us-gaap:StatementBusinessSegments

us-gaap:Corporate


Period End2020-03-312019-09-302019-03-312018-09-30
Value0210
Percentage of GainsLossesOnSalesOfOtherRealEstate100.0200.0100.0100.0

us-gaap:IncreaseDecreaseInDeposits



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value81664339451807-203435315204618347522-278-10992412386576406-4861453-168132751581594-861170653525-164261261252171598-342-1053-81257
Percentage of IncreaseDecreaseInDeposits100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInFairValueOfHedgedItemInInterestRateFairValueHedge1



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-71000000.014000000.0-1000000.0-12000000.0-6000000.0-4000000.0-1000000.00.00.00.00.0
Percentage of IncreaseDecreaseInFairValueOfHedgedItemInInterestRateFairValueHedge1100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DerivativeInstrumentRisk

us-gaap:InterestRateSwap


Period End2020-06-302019-06-30
Value-4000000.0-12000000.0
Percentage of IncreaseDecreaseInFairValueOfHedgedItemInInterestRateFairValueHedge10.0100.0

us-gaap:DerivativeInstrumentRisk

us-gaap:IncreaseDecreaseInFairValueOfInterestRateFairValueHedgingInstruments1

us-gaap:InterestRateSwap


Period End2020-06-302019-06-30
Value412
Percentage of IncreaseDecreaseInFairValueOfInterestRateFairValueHedgingInstruments1100.0100.0

us-gaap:IncreaseDecreaseInLoansHeldForSale



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value-518738381-41-2133-2618-53-36-101235-389-2323-37-4439-41-49-33-8977-50-20-21-41-282314-24
Percentage of IncreaseDecreaseInLoansHeldForSale100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInOperatingLiabilities



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value46-13527-30-43-3120814-3484-6342-2145314417821-6125663319-77282-48-10-11-183329-36371336
Percentage of IncreaseDecreaseInOperatingLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInOtherOperatingAssets



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value912033-20967013-79100-488042-12-21-2124225-765-31-326542-416-3-70-121-51-21-38-5084-41-18-100112-103
Percentage of IncreaseDecreaseInOtherOperatingAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInTradingSecurities



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value0-22-98132-168210-70-3163-492-522-766-105217-2502115-102111-10-61-21-1-57-423527
Percentage of IncreaseDecreaseInTradingSecurities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InterestAndDividendIncomeOperating



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value595622647677684675656631606589562557558515501490486474473456455448461460463467490473493484498515518523539554558552574581583580
Percentage of InterestAndDividendIncomeOperating100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InterestExpenseDeposits



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value2351626966574838292016151413121211111212121212121212141515192023313436465256
Percentage of InterestExpenseDeposits100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InterestIncomeExpenseAfterProvisionForLoanLoss



Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value395290557548572569576543582537517521466483450430410426407423418418471470417421452447446421426456414363267184189
Percentage of InterestIncomeExpenseAfterProvisionForLoanLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

zions:AmegyCorporation


Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value14108140141144133
Percentage of InterestIncomeExpenseAfterProvisionForLoanLoss4.819.425.524.725.024.5
zions:CaliforniaBankTrust


Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value84136131130129129
Percentage of InterestIncomeExpenseAfterProvisionForLoanLoss29.024.423.922.722.423.8
zions:CommerceBankOfWashington


Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value71512141311
Percentage of InterestIncomeExpenseAfterProvisionForLoanLoss2.42.72.22.42.32.0
zions:NationalBankOfArizona


Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value335760555751
Percentage of InterestIncomeExpenseAfterProvisionForLoanLoss11.410.210.99.69.99.4
zions:NevadaStateBank


Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value233840393638
Percentage of InterestIncomeExpenseAfterProvisionForLoanLoss7.96.87.36.86.27.0
zions:OtherSegment


Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value16-10-33-3-4-29
Percentage of InterestIncomeExpenseAfterProvisionForLoanLoss5.5-1.8-6.0-0.5-0.7-5.3
zions:VectraBankColorado


Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value73735313232
Percentage of InterestIncomeExpenseAfterProvisionForLoanLoss2.46.66.45.45.65.9
zions:ZionsBank


Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value106176163165169171
Percentage of InterestIncomeExpenseAfterProvisionForLoanLoss36.631.629.728.829.331.5

us-gaap:ConsolidationItems

us-gaap:CorporateNonSegment


Period End2020-06-302019-06-30
Value33-12
Percentage of InterestIncomeExpenseAfterProvisionForLoanLoss8.4-2.2

us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, zions:AmegyCorporation


Period End2020-06-302019-06-30
Value95135
Percentage of InterestIncomeExpenseAfterProvisionForLoanLoss24.124.6
us-gaap:OperatingSegments, zions:CaliforniaBankAndTrust


Period End2020-06-302019-06-30
Value77125
Percentage of InterestIncomeExpenseAfterProvisionForLoanLoss19.522.8
us-gaap:OperatingSegments, zions:CommerceBankOfWashington


Period End2020-06-302019-06-30
Value812
Percentage of InterestIncomeExpenseAfterProvisionForLoanLoss2.02.2
us-gaap:OperatingSegments, zions:NationalBankOfArizona


Period End2020-06-302019-06-30
Value3757
Percentage of InterestIncomeExpenseAfterProvisionForLoanLoss9.410.4
us-gaap:OperatingSegments, zions:NevadaStateBank


Period End2020-06-302019-06-30
Value-538
Percentage of InterestIncomeExpenseAfterProvisionForLoanLoss-1.36.9
us-gaap:OperatingSegments, zions:ZionsBank


Period End2020-06-302019-06-30
Value116159
Percentage of InterestIncomeExpenseAfterProvisionForLoanLoss29.429.0

us-gaap:StatementBusinessSegments

us-gaap:Corporate


Period End2020-03-312019-09-302019-03-312018-09-30
Value290557572576
Percentage of InterestIncomeExpenseAfterProvisionForLoanLoss100.0100.0100.0100.0

us-gaap:InterestIncomeExpenseNet



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value563548559567569576576565548542526522528489480469464452448425423417430416416416432415430418429444431442461470416423406451413455
Percentage of InterestIncomeExpenseNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

zions:AmegyCorporation


Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value117122126132126125126127
Percentage of InterestIncomeExpenseNet21.421.822.223.221.921.722.323.2
zions:CaliforniaBankTrust


Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value122127130140133132132131
Percentage of InterestIncomeExpenseNet22.322.722.924.623.122.923.423.9
zions:CommerceBankOfWashington


Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value1213131414171312
Percentage of InterestIncomeExpenseNet2.22.32.32.52.43.02.32.2
zions:NationalBankOfArizona


Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value5354576258575658
Percentage of InterestIncomeExpenseNet9.79.710.110.910.19.99.910.6
zions:NevadaStateBank


Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value3538394038383738
Percentage of InterestIncomeExpenseNet6.46.86.97.06.66.66.56.9
zions:OtherSegment


Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value18-4-9-34-4-5-3-28
Percentage of InterestIncomeExpenseNet3.3-0.7-1.6-6.0-0.7-0.9-0.5-5.1
zions:VectraBankColorado


Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value3234343635353334
Percentage of InterestIncomeExpenseNet5.86.16.06.36.16.15.86.2
zions:ZionsBank


Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value159175177179176177171176
Percentage of InterestIncomeExpenseNet29.031.331.231.530.630.730.332.1

us-gaap:ConsolidationItems

us-gaap:CorporateNonSegment


Period End2020-06-302019-06-30
Value30-13
Percentage of InterestIncomeExpenseNet5.3-2.3

us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, zions:AmegyCorporation


Period End2020-06-302019-06-30
Value120127
Percentage of InterestIncomeExpenseNet21.322.3
us-gaap:OperatingSegments, zions:CaliforniaBankAndTrust


Period End2020-06-302019-06-30
Value123134
Percentage of InterestIncomeExpenseNet21.823.6
us-gaap:OperatingSegments, zions:CommerceBankOfWashington


Period End2020-06-302019-06-30
Value1314
Percentage of InterestIncomeExpenseNet2.32.5
us-gaap:OperatingSegments, zions:NationalBankOfArizona


Period End2020-06-302019-06-30
Value5359
Percentage of InterestIncomeExpenseNet9.410.4
us-gaap:OperatingSegments, zions:NevadaStateBank


Period End2020-06-302019-06-30
Value3538
Percentage of InterestIncomeExpenseNet6.26.7
us-gaap:OperatingSegments, zions:VectraBankColorado


Period End2020-06-302019-06-30
Value3335
Percentage of InterestIncomeExpenseNet5.96.2
us-gaap:OperatingSegments, zions:ZionsBank


Period End2020-06-302019-06-30
Value156175
Percentage of InterestIncomeExpenseNet27.730.8

us-gaap:StatementBusinessSegments

us-gaap:Corporate


Period End2020-03-312019-12-312019-09-302019-03-312018-12-312018-09-30
Value548559567576576565
Percentage of InterestIncomeExpenseNet100.0100.0100.0100.0100.0100.0
us-gaap:CorporateAndOther


Period End2020-06-302019-06-30
Value563569
Percentage of InterestIncomeExpenseNet100.0100.0

us-gaap:InterestIncomeMoneyMarketDeposits



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value18688998765554445766555545655554332321
Percentage of InterestIncomeMoneyMarketDeposits100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InterestPaid



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value3588861161049580575544392730222218241828222822294140404541626544627151919289102
Percentage of InterestPaid100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InvestmentIncomeInterest



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value808283889596938685868084847859494747373028272424242825242725
Percentage of InvestmentIncomeInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InvestmentType

us-gaap:AvailableforsaleSecurities


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value747576818789867977797478787152424141312422201717172017161917
Percentage of InvestmentIncomeInterest92.591.591.692.091.692.792.591.990.691.992.592.992.991.087.986.786.487.883.479.877.574.372.172.171.074.668.368.070.168.4
us-gaap:HeldtomaturitySecurities


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value554666576665575555555666667777
Percentage of InvestmentIncomeInterest6.26.14.86.86.36.25.48.17.17.07.56.06.09.010.011.912.011.315.118.720.423.525.826.326.623.730.231.128.930.8
us-gaap:OtherTrading


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value123121202101
Percentage of InvestmentIncomeInterest1.22.43.61.12.11.02.20.02.41.20.01.2

us-gaap:InvestmentType, zions:TaxableVSNontaxableIncome

us-gaap:AvailableforsaleSecurities, zions:Nontaxable


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value766766767
Percentage of InvestmentIncomeInterest8.87.37.28.06.36.27.57.08.2
us-gaap:AvailableforsaleSecurities, zions:Taxable


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value676970748183797370
Percentage of InvestmentIncomeInterest83.884.184.384.185.386.584.984.982.4
us-gaap:HeldtomaturitySecurities, zions:Nontaxable


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value232344343
Percentage of InvestmentIncomeInterest2.53.72.43.44.24.23.24.73.5
us-gaap:HeldtomaturitySecurities, zions:Taxable


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value322322233
Percentage of InvestmentIncomeInterest3.82.42.43.42.12.12.23.53.5
us-gaap:OtherTrading, zions:Nontaxable


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value122121102
Percentage of InvestmentIncomeInterest1.22.42.41.12.11.01.10.02.4
us-gaap:OtherTrading, zions:Taxable


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value001000100
Percentage of InvestmentIncomeInterest0.00.01.20.00.00.01.10.00.0

zions:TaxableVSNontaxableIncome

zions:Nontaxable


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value101110111211111012
Percentage of InvestmentIncomeInterest12.513.412.012.512.611.511.811.614.1
zions:Taxable


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value707173778385827673
Percentage of InvestmentIncomeInterest87.586.688.087.587.488.588.288.485.9

us-gaap:InvestmentIncomeNonoperating



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value331649991111119910124965161177121112112199178887
Percentage of InvestmentIncomeNonoperating100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LaborAndRelatedExpense



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value267274306273274287270264266269255253242262240242241258236242251243238245238233229227229220220224216222215207205204
Percentage of LaborAndRelatedExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LeaseCost



Period End2020-06-302020-03-312019-09-302019-06-302019-03-31
Value2424262525
Percentage of LeaseCost100.0100.0100.0100.0100.0

us-gaap:LoansAndLeasesReceivableGainLossOnSalesNet



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-30
Value1313583223434144265354443358887
Percentage of LoansAndLeasesReceivableGainLossOnSalesNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:NoninterestExpense



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value430408472415424430419420428412417413405414404403381395402396404397422438406398494370451397407394401392425409416408443456430389
Percentage of NoninterestExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

zions:AmegyCorporation


Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value8286848688868686
Percentage of NoninterestExpense20.118.220.220.320.520.520.520.1
zions:CaliforniaBankTrust


Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value7777758282787776
Percentage of NoninterestExpense18.916.318.119.319.118.618.317.8
zions:CommerceBankOfWashington


Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value65556655
Percentage of NoninterestExpense1.51.11.21.21.41.41.21.2
zions:NationalBankOfArizona


Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value3640393839383938
Percentage of NoninterestExpense8.88.59.49.09.19.19.38.9
zions:NevadaStateBank


Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value3536353736363536
Percentage of NoninterestExpense8.67.68.48.78.48.68.38.4
zions:OtherSegment


Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value3582362933353438
Percentage of NoninterestExpense8.617.48.76.87.78.48.18.9
zions:VectraBankColorado


Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value2726272728272625
Percentage of NoninterestExpense6.65.56.56.46.56.46.25.8
zions:ZionsBank


Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value110120114120118114118117
Percentage of NoninterestExpense27.025.427.528.327.427.228.127.3

us-gaap:ConsolidationItems

us-gaap:CorporateNonSegment


Period End2020-06-302019-06-30
Value6529
Percentage of NoninterestExpense15.16.8

us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, zions:AmegyCorporation


Period End2020-06-302019-06-30
Value7986
Percentage of NoninterestExpense18.420.3
us-gaap:OperatingSegments, zions:CaliforniaBankAndTrust


Period End2020-06-302019-06-30
Value7482
Percentage of NoninterestExpense17.219.3
us-gaap:OperatingSegments, zions:NationalBankOfArizona


Period End2020-06-302019-06-30
Value3538
Percentage of NoninterestExpense8.19.0
us-gaap:OperatingSegments, zions:NevadaStateBank


Period End2020-06-302019-06-30
Value3437
Percentage of NoninterestExpense7.98.7
us-gaap:OperatingSegments, zions:ZionsBank


Period End2020-06-302019-06-30
Value111120
Percentage of NoninterestExpense25.828.3

us-gaap:StatementBusinessSegments

us-gaap:Corporate


Period End2020-03-312019-12-312019-09-302019-03-312018-12-312018-09-30
Value408472415430420420
Percentage of NoninterestExpense100.0100.0100.0100.0100.2100.0

us-gaap:NoninterestIncome



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value1171341521461321321401361381381401391321321281441251161241300121129116124138122125121119123106121128134110109107
Percentage of NoninterestIncome100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

zions:AmegyCorporation


Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value3633373434313131
Percentage of NoninterestIncome26.921.725.325.825.822.122.822.5
zions:CaliforniaBankTrust


Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value2525232219231919
Percentage of NoninterestIncome18.716.415.816.714.416.414.013.8
zions:NationalBankOfArizona


Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value1111101110101010
Percentage of NoninterestIncome8.27.26.88.37.67.17.47.2
zions:NevadaStateBank


Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value1111111110111010
Percentage of NoninterestIncome8.27.27.58.37.67.97.47.2
zions:OtherSegment


Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value42617819192123
Percentage of NoninterestIncome3.017.111.66.114.413.615.416.7
zions:VectraBankColorado


Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value87766666
Percentage of NoninterestIncome6.04.64.84.54.54.34.44.3
zions:ZionsBank


Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value3838403933393838
Percentage of NoninterestIncome28.425.027.429.525.027.927.927.5

us-gaap:ConsolidationItems

us-gaap:CorporateNonSegment


Period End2020-06-302019-06-30
Value09
Percentage of NoninterestIncome0.06.8

us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, zions:AmegyCorporation


Period End2020-06-302019-06-30
Value3134
Percentage of NoninterestIncome26.525.8
us-gaap:OperatingSegments, zions:CaliforniaBankAndTrust


Period End2020-06-302019-06-30
Value1922
Percentage of NoninterestIncome16.216.7
us-gaap:OperatingSegments, zions:NationalBankOfArizona


Period End2020-06-302019-06-30
Value1011
Percentage of NoninterestIncome8.58.3
us-gaap:OperatingSegments, zions:NevadaStateBank


Period End2020-06-302019-06-30
Value1011
Percentage of NoninterestIncome8.58.3
us-gaap:OperatingSegments, zions:VectraBankColorado


Period End2020-06-302019-06-30
Value86
Percentage of NoninterestIncome6.84.5

us-gaap:StatementBusinessSegments

us-gaap:Corporate


Period End2020-03-312019-12-312019-09-302019-03-312018-12-312018-09-30
Value134152146132140136
Percentage of NoninterestIncome100.0100.0100.0100.0100.0100.0
us-gaap:CorporateAndOther


Period End2020-06-302019-06-30
Value117132
Percentage of NoninterestIncome100.0100.0

us-gaap:NoninterestIncomeOtherOperatingIncome



Period End2020-06-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value117-42011423-1021122250220254632423202023
Percentage of NoninterestIncomeOtherOperatingIncome100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

zions:AmegyCorporation


Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value363734343131
Percentage of NoninterestIncomeOtherOperatingIncome0.00.0-850.01700.03100.03100.0
zions:CaliforniaBankTrust


Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value252322191919
Percentage of NoninterestIncomeOtherOperatingIncome0.00.0-550.0950.01900.01900.0
zions:NationalBankOfArizona


Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value111011101010
Percentage of NoninterestIncomeOtherOperatingIncome0.00.0-275.0500.01000.01000.0
zions:NevadaStateBank


Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value111111101010
Percentage of NoninterestIncomeOtherOperatingIncome0.00.0-275.0500.01000.01000.0
zions:OtherSegment


Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value4178192123
Percentage of NoninterestIncomeOtherOperatingIncome0.00.0-200.0950.02100.02300.0
zions:VectraBankColorado


Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value876666
Percentage of NoninterestIncomeOtherOperatingIncome0.00.0-150.0300.0600.0600.0
zions:ZionsBank


Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value384039333838
Percentage of NoninterestIncomeOtherOperatingIncome0.00.0-975.01650.03800.03800.0

us-gaap:ConsolidationItems

us-gaap:CorporateNonSegment


Period End2020-06-302019-06-30
Value09
Percentage of NoninterestIncomeOtherOperatingIncome0.0-225.0

us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, zions:AmegyCorporation


Period End2020-06-302019-06-30
Value3134
Percentage of NoninterestIncomeOtherOperatingIncome26.5-850.0
us-gaap:OperatingSegments, zions:CaliforniaBankAndTrust


Period End2020-06-302019-06-30
Value1922
Percentage of NoninterestIncomeOtherOperatingIncome16.2-550.0
us-gaap:OperatingSegments, zions:NationalBankOfArizona


Period End2020-06-302019-06-30
Value1011
Percentage of NoninterestIncomeOtherOperatingIncome8.5-275.0
us-gaap:OperatingSegments, zions:NevadaStateBank


Period End2020-06-302019-06-30
Value1011
Percentage of NoninterestIncomeOtherOperatingIncome8.5-275.0
us-gaap:OperatingSegments, zions:VectraBankColorado


Period End2020-06-302019-06-30
Value86
Percentage of NoninterestIncomeOtherOperatingIncome6.8-150.0

us-gaap:StatementBusinessSegments

us-gaap:Corporate


Period End2020-03-312019-09-302019-03-312018-09-30
Value134146132136
Percentage of NoninterestIncomeOtherOperatingIncome0.00.06600.013600.0

us-gaap:OccupancyNet



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value3233343432333633323128353233323329293029302929282828282727282827292728292728
Percentage of OccupancyNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingLeaseLeaseIncome



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value3333323333
Percentage of OperatingLeaseLeaseIncome100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingLeasePayments



Period End2020-06-302020-03-312019-09-302019-06-302019-03-31
Value1313131210
Percentage of OperatingLeasePayments100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-31
Value218-923146127108-49-47-128-61-86312-135-113744-3919-513-3218117136
Percentage of OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RetirementPlanType

us-gaap:OtherPensionPlansDefinedBenefit


Period End2020-03-312019-09-302019-06-302019-03-312018-09-30
Value14720115122-46
Percentage of OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax67.487.078.896.193.9
us-gaap:OtherPensionPlansPostretirementOrSupplementalPlansDefinedBenefit


Period End2020-03-312019-09-302019-06-302019-03-312018-09-30
Value713315-1
Percentage of OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax32.613.021.23.92.0

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax



Period End2020-06-302019-06-30
Value730
Percentage of OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax100.0100.0

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax



Period End2020-06-30
Value-4
Percentage of OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax100.0

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

us-gaap:InterestRateFloor, us-gaap:CashFlowHedging, us-gaap:DesignatedAsHedgingInstrument


Period End2020-06-302019-06-30
Value02
Percentage of OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax-0.00.0
us-gaap:InterestRateSwap, us-gaap:CashFlowHedging, us-gaap:DesignatedAsHedgingInstrument


Period End2020-06-302019-06-30
Value1024
Percentage of OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax-250.00.0

us-gaap:HedgingDesignation

us-gaap:DesignatedAsHedgingInstrument


Period End2020-06-302019-06-30
Value1026
Percentage of OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax-250.00.0

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax



Period End2020-06-302019-06-30
Value10-1
Percentage of OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax100.0100.0

us-gaap:DerivativeInstrumentRisk

us-gaap:InterestRateContract


Period End2020-06-302019-06-30
Value10-1
Percentage of OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax100.0100.0

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

us-gaap:InterestRateFloor, us-gaap:CashFlowHedging, us-gaap:DesignatedAsHedgingInstrument


Period End2020-06-302019-06-30
Value3-1
Percentage of OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax30.0100.0
us-gaap:InterestRateSwap, us-gaap:CashFlowHedging, us-gaap:DesignatedAsHedgingInstrument


Period End2020-06-302019-06-30
Value10-1
Percentage of OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax100.0100.0

us-gaap:HedgingDesignation

us-gaap:DesignatedAsHedgingInstrument


Period End2020-06-302019-06-30
Value13-2
Percentage of OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax130.0200.0

us-gaap:DerivativeInstrumentRisk, us-gaap:IncomeStatementLocation

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTax

us-gaap:InterestRateContract, zions:InterestAndFeesOnLoan


Period End2020-06-302019-06-30
Value13-2
Percentage of OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTax100.0100.0

us-gaap:DerivativeInstrumentRisk

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationTax

us-gaap:InterestRateContract


Period End2020-06-302019-06-30
Value3-1
Percentage of OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationTax100.0100.0

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

us-gaap:OtherComprehensiveIncomeLossDerivativeExcludedComponentIncreaseDecreaseAdjustmentsBeforeTax

us-gaap:InterestRateFloor, us-gaap:CashFlowHedging, us-gaap:DesignatedAsHedgingInstrument


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value00010153000
Percentage of OtherComprehensiveIncomeLossDerivativeExcludedComponentIncreaseDecreaseAdjustmentsBeforeTax100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:HedgingDesignation

us-gaap:DesignatedAsHedgingInstrument


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value00010153000
Percentage of OtherComprehensiveIncomeLossDerivativeExcludedComponentIncreaseDecreaseAdjustmentsBeforeTax100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-30
Value2-2-1-1-1-1-110001111112100000000011
Percentage of OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansNetOfTax



Period End2020-06-302019-06-30
Value130
Percentage of OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansNetOfTax100.0100.0

us-gaap:OtherComprehensiveIncomeLossTax



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
Value71-28484237-15-16-42-11-5396-80-82127-2311528-917538122-51923
Percentage of OtherComprehensiveIncomeLossTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

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

us-gaap:OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax

us-gaap:InterestRateFloor, us-gaap:CashFlowHedging, us-gaap:DesignatedAsHedgingInstrument


Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value00-220000
Percentage of OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax100.0100.0100.0100.0100.0100.0100.0100.0
us-gaap:InterestRateSwap, us-gaap:CashFlowHedging, us-gaap:DesignatedAsHedgingInstrument


Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value9214124813-1-2
Percentage of OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax100.0100.0-50.01200.0100.0100.0100.0100.0

us-gaap:HedgingDesignation

us-gaap:DesignatedAsHedgingInstrument


Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value9214-126117-1-2-5
Percentage of OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax100.0100.050.01300.0100.0100.0100.0100.00.0

us-gaap:OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-31
Value69-1263182-10-3-301-1-9-3412-510021010000-1-1-3-4-5-8
Percentage of OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RetirementPlanType

us-gaap:OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax

us-gaap:OtherPensionPlansPostretirementOrSupplementalPlansDefinedBenefit


Period End2020-03-312019-09-302019-06-302019-03-312018-09-30
Value2321020
Percentage of OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-30
Value94147019116122108-45-50-126-67-86112-128-103232-2711-70-18181071-142948436
Percentage of OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RetirementPlanType

us-gaap:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax

us-gaap:OtherPensionPlansDefinedBenefit


Period End2020-03-312019-09-302019-06-302019-03-312018-09-30
Value4863840-15
Percentage of OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax100.0100.0100.0100.0100.0

us-gaap:OtherNoncashIncomeExpense



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-30
Value62-513287468-6101014-5132-13-71503375-9-25-41513-3-2102-2-24
Percentage of OtherNoncashIncomeExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherNoninterestExpense



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value7345725151515049494964545451526050507356535874666672647878676763697266836254
Percentage of OtherNoninterestExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherPreferredStockDividendsAndAdjustments



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-30
Value9-89-8-9-89-8-10-710-8-12-1084-10
Percentage of OtherPreferredStockDividendsAndAdjustments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherRevenueExpenseFromRealEstateOperations



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value0.00.00.0-2000000.00.0-1000000.00.01000000.00.00.00.0-1000000.0
Percentage of OtherRevenueExpenseFromRealEstateOperations100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentsForOriginationAndPurchasesOfLoansHeldForSale



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-30
Value6023153213161709341618423516536017617630320386356235442359309297301295374419358452401
Percentage of PaymentsForOriginationAndPurchasesOfLoansHeldForSale100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentsForProceedsFromOtherInvestingActivities



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-30
Value-14-19-240-42-2-12-3-1-2-2-923-1010-1-17-25-3-15-12-1-50-12-72-6
Percentage of PaymentsForProceedsFromOtherInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentsForProceedsFromOtherLoansAndLeases



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-30
Value51701211-1282081017860962550120311624475919117201731018808558122-148100340126
Percentage of PaymentsForProceedsFromOtherLoansAndLeases100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentsForProceedsFromShortTermInvestments



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value71547-426401113-940930-106-15711765-363-530145-1185389-1850-2101-1156-1181754-253739955-167280-12276-628-49028855823529150-38014372796
Percentage of PaymentsForProceedsFromShortTermInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentsToAcquireAvailableForSaleSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value11645932434056236671084564612718535353311333841606124331232026172897278466945122145240812448673187406523238279202139196
Percentage of PaymentsToAcquireAvailableForSaleSecurities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentsToAcquireHeldToMaturitySecurities



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value152171435699110043165578954667180359210836012286142735874454249921524722
Percentage of PaymentsToAcquireHeldToMaturitySecurities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementClassOfStock

us-gaap:PreferredStockDividendRatePercentage

us-gaap:SeriesFPreferredStock


Period End2023-03-152013-02-072012-05-07
Value0.04240.0630.079
Percentage of PreferredStockDividendRatePercentage100.0100.0100.0
zion:SeriesIPreferredStock


Period End2023-06-152013-05-17
Value0.0380.058
Percentage of PreferredStockDividendRatePercentage0.00.0
zion:SeriesJPreferredStock


Period End2023-09-152013-08-11
Value0.04440.072
Percentage of PreferredStockDividendRatePercentage0.00.0

us-gaap:ProceedsFromIssuanceOfCommonStock



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302012-09-302012-06-302012-03-312011-09-302011-06-302011-02-102011-03-31
Value32613412710529916421213014100020025
Percentage of ProceedsFromIssuanceOfCommonStock100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value9678288838777585876659927356696376156305305306834752098315385751228362374194847246259359187235440507277302279152409
Percentage of ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value4924807213810177170555965837591273310223526213949201918142753373420301229365826
Percentage of ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromPaymentsForOtherFinancingActivities



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value2-901-2-800000080-4000-6000-30-2-500-4-20-200-20
Percentage of ProceedsFromPaymentsForOtherFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromRepaymentsOfDebt



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value04950049704970000
Percentage of ProceedsFromRepaymentsOfDebt100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProfessionalFees



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value1012141013111512141212141314161412111312131126161210161710121211886989
Percentage of ProfessionalFees100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProvisionForLoanAndLeaseLosses



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value161240782027-115-40-115723-218344222180-111-54-540-30-5-21-29-10-11015-114160173184228265
Percentage of ProvisionForLoanAndLeaseLosses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable

us-gaap:CommercialPortfolioSegment


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-30
Value186137119-23-17-11-18-40-4-492202225454322524-57-20-2911-1-5-3-415
Percentage of ProvisionForLoanAndLeaseLosses115.557.1157.1112.5-115.0-50.0100.0100.0-360.0100.036.4-80.0128.695.721.0118.473.0108.9192.5122.81049.6-1668.9-500.236.754.9-1915.131.723.611.1228.9141.6
us-gaap:CommercialRealEstatePortfolioSegment


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-30
Value16597611-6-515-1-3-7-5-3-4-691-13-6426-12234-19-1-4-11-182-10
Percentage of ProvisionForLoanAndLeaseLosses9.924.6100.075.05.050.0-85.745.5300.02.527.3-140.0-71.4-13.0173.4-34.227.94.0-58.5-36.3880.4-1799.7-1060.8-62.535.6256.981.151.064.2-114.2-93.4
us-gaap:ConsumerPortfolioSegment


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-30
Value-414435-426581-41634220-5-7200-250-5-80-8-536
Percentage of ProvisionForLoanAndLeaseLosses-25.518.342.962.5-20.0100.085.7-45.5160.0-2.536.4320.042.917.4-94.315.8-0.9-12.9-34.013.5-69.3-30.7-216.50.89.61453.8-10.237.617.3-177.461.6

us-gaap:ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-31
Value2-3-1-1-1-3-310-40117-1-1-1-166-1840257-3-243
Percentage of ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RetirementPlanType

us-gaap:OtherPensionPlansPostretirementOrSupplementalPlansDefinedBenefit


Period End2020-03-312019-09-302019-06-302019-03-312018-09-30
Value2-1-1-1-1
Percentage of ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax100.0100.0100.0100.033.3

us-gaap:DerivativeInstrumentRisk, us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents

us-gaap:ReclassificationFromAociCurrentPeriodTax

us-gaap:InterestRateContract, us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:AociIncludingPortionAttributableToNoncontrollingInterest


Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value2-1-1-1-1-1
Percentage of ReclassificationFromAociCurrentPeriodTax100.0100.0100.0100.0100.0100.0

us-gaap:DebtInstrument, us-gaap:LongtermDebtType

us-gaap:RepaymentsOfDebt

zions:A335SeniorNotes, us-gaap:SeniorNotes


Period End2020-06-30
Value210
Percentage of RepaymentsOfDebt100.0
zions:A350SeniorNotes, us-gaap:SeniorNotes


Period End2020-06-30
Value219
Percentage of RepaymentsOfDebt104.3

us-gaap:RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability



Period End2020-06-302020-03-312019-09-302019-06-302019-03-31
Value33640
Percentage of RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability100.0100.0100.0100.0100.0

us-gaap:SalesTypeAndDirectFinancingLeasesProfitLoss



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value3333343433
Percentage of SalesTypeAndDirectFinancingLeasesProfitLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementEquityComponents

us-gaap:StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures

us-gaap:CommonStock


Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value000000
Percentage of StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures100.0100.0100.0100.0100.0100.0

us-gaap:StatementEquityComponents

us-gaap:StockIssuedDuringPeriodSharesShareBasedCompensation

us-gaap:CommonStock


Period End2020-06-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-31
Value000000000000000000000000
Percentage of StockIssuedDuringPeriodSharesShareBasedCompensation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StockIssuedDuringPeriodValueShareBasedCompensation



Period End2020-06-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-31
Value7611420516877162192107189469667
Percentage of StockIssuedDuringPeriodValueShareBasedCompensation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital


Period End2020-06-302019-06-30
Value76
Percentage of StockIssuedDuringPeriodValueShareBasedCompensation100.0100.0

us-gaap:StockRepurchasedDuringPeriodShares



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-30
Value156555322231111
Percentage of StockRepurchasedDuringPeriodShares100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementEquityComponents

us-gaap:CommonStock


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-31
Value01565-5-532-2-2-2-1-1-1
Percentage of StockRepurchasedDuringPeriodShares0.098.2100.5100.6101.0-100.1-103.0100.2108.1-107.5-116.0-84.4-109.8-96.4-100.0

us-gaap:StockRepurchasedDuringPeriodValue



Period End2020-06-302019-06-30
Value0276
Percentage of StockRepurchasedDuringPeriodValue100.0100.0

us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital


Period End2020-06-302020-03-312019-09-302019-06-302019-03-31
Value0-75-275-276-276
Percentage of StockRepurchasedDuringPeriodValue100.00.00.0-100.00.0
us-gaap:Parent


Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value-75-275-276-276-186-127
Percentage of StockRepurchasedDuringPeriodValue0.00.0-100.00.00.00.0

us-gaap:TransferOfPortfolioLoansAndLeasesToHeldForSale1



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value15722630073124151111235144022
Percentage of TransferOfPortfolioLoansAndLeasesToHeldForSale1100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:TransferToOtherRealEstate



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-31
Value10511520331122161513334846121723375152
Percentage of TransferToOtherRealEstate100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:UndistributedEarnings



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value05011715513514916015714019177128138
Percentage of UndistributedEarnings100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:UndistributedEarningsLossAvailableToCommonShareholdersDiluted



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value0-5011515413414815915613919081127137
Percentage of UndistributedEarningsLossAvailableToCommonShareholdersDiluted100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:VariableLeaseCost



Period End2020-06-302020-03-312019-09-302019-06-302019-03-31
Value1212141313
Percentage of VariableLeaseCost100.0100.0100.0100.0100.0

us-gaap:InformationByCategoryOfDebtSecurity

zions:AvailableForSaleDebtSecuritiesGrossUnrealizedGainsRecognizedInOCI

us-gaap:AgencySecurities


Period End2020-03-312019-09-30
Value227
Percentage of AvailableForSaleDebtSecuritiesGrossUnrealizedGainsRecognizedInOCI100.0100.0
zions:AgencyGuaranteedMortgageBackedSecurities


Period End2020-03-312019-09-30
Value23394
Percentage of AvailableForSaleDebtSecuritiesGrossUnrealizedGainsRecognizedInOCI1059.11342.9

us-gaap:InformationByCategoryOfDebtSecurity

zions:AvailableForSaleDebtSecuritiesGrossUnrealizedLossesRecognizedInOCI

us-gaap:AgencySecurities


Period End2020-03-312019-09-30
Value23
Percentage of AvailableForSaleDebtSecuritiesGrossUnrealizedLossesRecognizedInOCI100.0100.0
zions:AgencyGuaranteedMortgageBackedSecurities


Period End2020-03-312019-09-30
Value1551
Percentage of AvailableForSaleDebtSecuritiesGrossUnrealizedLossesRecognizedInOCI750.01700.0
zions:AvailableforsaleOtherdebtsecurities


Period End2020-03-312019-09-30
Value21
Percentage of AvailableForSaleDebtSecuritiesGrossUnrealizedLossesRecognizedInOCI100.033.3
zions:SmallBusinessAdministrationLoanBackedSecurities


Period End2020-03-312019-09-30
Value3842
Percentage of AvailableForSaleDebtSecuritiesGrossUnrealizedLossesRecognizedInOCI1900.01400.0

zions:AverageDeposits



Period End2020-06-302019-06-30
Value6300054347
Percentage of AverageDeposits100.0100.0

dei:LegalEntity

zions:AmegyCorporation


Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value11664781184211361114411381118511060
Percentage of AverageDeposits0.00.00.020.90.00.00.00.0
zions:CaliforniaBankTrust


Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value12129114115651141211243551133511181
Percentage of AverageDeposits0.00.00.021.00.00.00.00.0
zions:CommerceBankOfWashington


Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value1047191097105310752310861048
Percentage of AverageDeposits0.00.00.01.90.00.00.00.0
zions:NationalBankOfArizona


Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value5103125028504848941950084942
Percentage of AverageDeposits0.00.00.09.30.00.00.00.0
zions:NevadaStateBank


Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value482884454744064329643024314
Percentage of AverageDeposits0.00.00.08.10.00.00.00.0
zions:OtherSegment


Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value32201823562801284255324852221
Percentage of AverageDeposits0.00.00.05.20.00.00.00.0
zions:VectraBankColorado


Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value298820286628112821-127892784
Percentage of AverageDeposits0.00.00.05.20.00.00.00.0
zions:ZionsBank


Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value15930214159831545515271-4371538515346
Percentage of AverageDeposits0.00.00.028.40.00.00.00.0

us-gaap:ConsolidationItems

us-gaap:CorporateNonSegment


Period End2020-06-302019-06-30
Value24103051
Percentage of AverageDeposits3.85.6

us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, zions:AmegyCorporation


Period End2020-06-302019-06-30
Value1302311361
Percentage of AverageDeposits20.720.9
us-gaap:OperatingSegments, zions:CaliforniaBankAndTrust


Period End2020-06-302019-06-30
Value1352211412
Percentage of AverageDeposits21.521.0
us-gaap:OperatingSegments, zions:CommerceBankOfWashington


Period End2020-06-302019-06-30
Value12821053
Percentage of AverageDeposits2.01.9
us-gaap:OperatingSegments, zions:NationalBankOfArizona


Period End2020-06-302019-06-30
Value57225048
Percentage of AverageDeposits9.19.3
us-gaap:OperatingSegments, zions:NevadaStateBank


Period End2020-06-302019-06-30
Value54024406
Percentage of AverageDeposits8.68.1
us-gaap:OperatingSegments, zions:VectraBankColorado


Period End2020-06-302019-06-30
Value36622811
Percentage of AverageDeposits5.85.2
us-gaap:OperatingSegments, zions:ZionsBank


Period End2020-06-302019-06-30
Value1797715205
Percentage of AverageDeposits28.528.0

us-gaap:StatementBusinessSegments

us-gaap:Corporate


Period End2020-03-312019-12-312019-09-302019-03-312018-12-312018-09-30
Value56909559552845391635653575
Percentage of AverageDeposits0.00.00.00.00.00.0

zions:AverageLoansAndLeases



Period End2020-06-302019-06-30
Value5426848324
Percentage of AverageLoansAndLeases100.0100.0

dei:LegalEntity

zions:AmegyCorporation


Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value1239949124381225411861-41132811387
Percentage of AverageLoansAndLeases0.00.00.025.40.00.00.00.0
zions:CaliforniaBankTrust


Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value11022181081910838105749299859908
Percentage of AverageLoansAndLeases0.00.00.022.40.00.00.00.0
zions:CommerceBankOfWashington


Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value125811123512031110511361117
Percentage of AverageLoansAndLeases0.00.00.02.50.00.00.00.0
zions:NationalBankOfArizona


Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value4736-144769484747491745914640
Percentage of AverageLoansAndLeases0.00.00.010.00.00.00.00.0
zions:NevadaStateBank


Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value2716362708257025002524082349
Percentage of AverageLoansAndLeases0.00.00.05.30.00.00.00.0
zions:OtherSegment


Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value5631946944038311344327
Percentage of AverageLoansAndLeases0.00.00.00.90.00.00.00.0
zions:VectraBankColorado


Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value310223161310530554229692881
Percentage of AverageLoansAndLeases0.00.00.06.40.00.00.00.0
zions:ZionsBank


Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value1300130132291306712939781260712633
Percentage of AverageLoansAndLeases0.00.00.027.00.00.00.00.0

us-gaap:ConsolidationItems

us-gaap:CorporateNonSegment


Period End2020-06-302019-06-30
Value561440
Percentage of AverageLoansAndLeases1.00.9

us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, zions:AmegyCorporation


Period End2020-06-302019-06-30
Value1357012254
Percentage of AverageLoansAndLeases25.025.4
us-gaap:OperatingSegments, zions:CaliforniaBankAndTrust


Period End2020-06-302019-06-30
Value1252410838
Percentage of AverageLoansAndLeases23.122.4
us-gaap:OperatingSegments, zions:CommerceBankOfWashington


Period End2020-06-302019-06-30
Value14851203
Percentage of AverageLoansAndLeases2.72.5
us-gaap:OperatingSegments, zions:NationalBankOfArizona


Period End2020-06-302019-06-30
Value52474847
Percentage of AverageLoansAndLeases9.710.0
us-gaap:OperatingSegments, zions:NevadaStateBank


Period End2020-06-302019-06-30
Value31692570
Percentage of AverageLoansAndLeases5.85.3
us-gaap:OperatingSegments, zions:VectraBankColorado


Period End2020-06-302019-06-30
Value34903105
Percentage of AverageLoansAndLeases6.46.4
us-gaap:OperatingSegments, zions:ZionsBank


Period End2020-06-302019-06-30
Value1422213067
Percentage of AverageLoansAndLeases26.227.0

us-gaap:StatementBusinessSegments

us-gaap:Corporate


Period End2020-03-312019-12-312019-09-302019-03-312018-12-312018-09-30
Value48797151488284717126645368
Percentage of AverageLoansAndLeases0.00.00.00.00.00.0

zions:CapitalMarketsAndForeignExchangeGainLoss



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value1824192391717147
Percentage of CapitalMarketsAndForeignExchangeGainLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

zions:AmegyCorporation


Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value220-1-2118-1-1
Percentage of CapitalMarketsAndForeignExchangeGainLoss8.3105.3-4.3-22.25.9105.9-7.1-14.3
zions:CaliforniaBankTrust


Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value01210111
Percentage of CapitalMarketsAndForeignExchangeGainLoss0.05.38.711.10.05.97.114.3
zions:CommerceBankOfWashington


Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value0-1000-100
Percentage of CapitalMarketsAndForeignExchangeGainLoss0.0-5.30.00.00.0-5.90.00.0
zions:NationalBankOfArizona


Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value01000100
Percentage of CapitalMarketsAndForeignExchangeGainLoss0.05.30.00.00.05.90.00.0
zions:OtherSegment


Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value13112122
Percentage of CapitalMarketsAndForeignExchangeGainLoss4.215.84.311.111.85.914.328.6
zions:ZionsBank


Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value02120211
Percentage of CapitalMarketsAndForeignExchangeGainLoss0.010.54.322.20.011.87.114.3

us-gaap:ConsolidationItems

us-gaap:CorporateNonSegment


Period End2020-06-302019-06-30
Value31
Percentage of CapitalMarketsAndForeignExchangeGainLoss16.711.1

us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, zions:ZionsBank


Period End2020-06-302019-06-30
Value-10
Percentage of CapitalMarketsAndForeignExchangeGainLoss-5.60.0

us-gaap:StatementBusinessSegments

us-gaap:CorporateAndOther


Period End2020-06-302019-06-30
Value32
Percentage of CapitalMarketsAndForeignExchangeGainLoss16.722.2

zions:CardFees



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value1921222423222424
Percentage of CardFees100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

zions:CommerceBankOfWashington


Period End2020-03-312019-12-312019-09-302019-03-312018-12-312018-09-30
Value101111
Percentage of CardFees4.80.04.24.54.24.2
zions:NationalBankOfArizona


Period End2020-03-312019-12-312019-09-302019-03-312018-12-312018-09-30
Value352342
Percentage of CardFees14.322.78.313.616.78.3
zions:NevadaStateBank


Period End2020-03-312019-12-312019-09-302019-03-312018-12-312018-09-30
Value362352
Percentage of CardFees14.327.38.313.620.88.3
zions:OtherSegment


Period End2020-03-312019-12-312019-09-302019-03-312018-12-312018-09-30
Value110120
Percentage of CardFees4.84.50.04.58.30.0
zions:VectraBankColorado


Period End2020-03-312019-12-312019-09-302019-03-312018-12-312018-09-30
Value131231
Percentage of CardFees4.813.64.29.112.54.2
zions:ZionsBank


Period End2020-03-312019-12-312019-09-302019-03-312018-12-312018-09-30
Value1261512615
Percentage of CardFees57.127.362.554.525.062.5

us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, zions:AmegyCorporation


Period End2020-06-302019-06-30
Value67
Percentage of CardFees31.630.4
us-gaap:OperatingSegments, zions:CaliforniaBankAndTrust


Period End2020-06-302019-06-30
Value34
Percentage of CardFees15.817.4
us-gaap:OperatingSegments, zions:NationalBankOfArizona


Period End2020-06-302019-06-30
Value23
Percentage of CardFees10.513.0
us-gaap:OperatingSegments, zions:NevadaStateBank


Period End2020-06-302019-06-30
Value23
Percentage of CardFees10.513.0
us-gaap:OperatingSegments, zions:VectraBankColorado


Period End2020-06-302019-06-30
Value12
Percentage of CardFees5.38.7
us-gaap:OperatingSegments, zions:ZionsBank


Period End2020-06-302019-06-30
Value1113
Percentage of CardFees57.956.5

us-gaap:StatementBusinessSegments

us-gaap:Corporate


Period End2020-03-312019-09-302019-03-312018-09-30
Value30323132
Percentage of CardFees142.9133.3140.9133.3
us-gaap:CorporateAndOther


Period End2020-06-302019-06-30
Value2532
Percentage of CardFees131.6139.1

zions:CommercialAccountFees



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value3031313130302931
Percentage of CommercialAccountFees100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

zions:AmegyCorporation


Period End2020-03-312019-12-312019-09-302019-03-312018-12-312018-09-30
Value998889
Percentage of CommercialAccountFees29.029.025.826.727.629.0
zions:CaliforniaBankTrust


Period End2020-03-312019-12-312019-09-302019-03-312018-12-312018-09-30
Value666656
Percentage of CommercialAccountFees19.419.419.420.017.219.4
zions:CommerceBankOfWashington


Period End2020-03-312019-12-312019-09-302019-03-312018-12-312018-09-30
Value010010
Percentage of CommercialAccountFees0.03.20.00.03.40.0
zions:NationalBankOfArizona


Period End2020-03-312019-12-312019-09-302019-03-312018-12-312018-09-30
Value222212
Percentage of CommercialAccountFees6.56.56.56.73.46.5
zions:OtherSegment


Period End2020-03-312019-12-312019-09-302019-03-312018-12-312018-09-30
Value1-100-10
Percentage of CommercialAccountFees3.2-3.20.00.0-3.40.0
zions:VectraBankColorado


Period End2020-03-312019-12-312019-09-302019-03-312018-12-312018-09-30
Value212212
Percentage of CommercialAccountFees6.53.26.56.73.46.5
zions:ZionsBank


Period End2020-03-312019-12-312019-09-302019-03-312018-12-312018-09-30
Value111111101010
Percentage of CommercialAccountFees35.535.535.533.334.532.3

us-gaap:ConsolidationItems

us-gaap:CorporateNonSegment


Period End2020-06-302019-06-30
Value0-1
Percentage of CommercialAccountFees0.0-3.3

us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, zions:AmegyCorporation


Period End2020-06-302019-06-30
Value109
Percentage of CommercialAccountFees33.330.0
us-gaap:OperatingSegments, zions:CaliforniaBankAndTrust


Period End2020-06-302019-06-30
Value56
Percentage of CommercialAccountFees16.720.0
us-gaap:OperatingSegments, zions:NevadaStateBank


Period End2020-06-302019-06-30
Value12
Percentage of CommercialAccountFees3.36.7

us-gaap:StatementBusinessSegments

us-gaap:Corporate


Period End2020-03-312019-09-302019-03-312018-09-30
Value31313031
Percentage of CommercialAccountFees100.0100.0100.0100.0

zions:CreditAndCollectionServices



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value644286657
Percentage of CreditAndCollectionServices100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementEquityComponents

zions:CumulativeEffectAdjustmentMeasurementOfCreditLossesOnFinancialInstruments

us-gaap:Parent


Period End2020-03-31
Value20
Percentage of CumulativeEffectAdjustmentMeasurementOfCreditLossesOnFinancialInstruments100.0
us-gaap:RetainedEarnings


Period End2020-03-31
Value20
Percentage of CumulativeEffectAdjustmentMeasurementOfCreditLossesOnFinancialInstruments100.0

us-gaap:InformationByCategoryOfDebtSecurity

zions:DebSecuritiesHeldtomaturityGrossUnrealizedGains

us-gaap:USStatesAndPoliticalSubdivisions


Period End2020-03-312019-09-30
Value45
Percentage of DebSecuritiesHeldtomaturityGrossUnrealizedGains100.0100.0

us-gaap:InformationByCategoryOfDebtSecurity

zions:DebtSecuritiesHeldtomaturityGrossUnrealizedLosses

us-gaap:USStatesAndPoliticalSubdivisions


Period End2020-03-312019-09-30
Value21
Percentage of DebtSecuritiesHeldtomaturityGrossUnrealizedLosses100.0100.0

zions:DerivativeGainRecognizedOnUndesignatedDerivatives



Period End2020-03-312019-03-31
Value156
Percentage of DerivativeGainRecognizedOnUndesignatedDerivatives100.0100.0

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

zions:DerivativeInstrumentNoninterestIncomeExpense

us-gaap:InterestRateContract, us-gaap:CashFlowHedging, us-gaap:DesignatedAsHedgingInstrument


Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value23000100
Percentage of DerivativeInstrumentNoninterestIncomeExpense100.0100.0100.0100.0100.0100.0100.0100.0
us-gaap:InterestRateContract, us-gaap:FairValueHedging, us-gaap:DesignatedAsHedgingInstrument


Period End2020-06-302019-06-30
Value10
Percentage of DerivativeInstrumentNoninterestIncomeExpense0.0100.0
zions:TerminatedSwapsOnLongTermDebt, us-gaap:FairValueHedging, us-gaap:DesignatedAsHedgingInstrument


Period End2020-06-302019-06-30
Value60
Percentage of DerivativeInstrumentNoninterestIncomeExpense0.0100.0

us-gaap:FinancialInstrument, us-gaap:HedgingDesignation

us-gaap:ForeignExchange, us-gaap:Nondesignated


Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value5766545
Percentage of DerivativeInstrumentNoninterestIncomeExpense0.0350.0100.0100.0100.0100.0100.0
us-gaap:InterestRateSwap, us-gaap:Nondesignated


Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value293-1000
Percentage of DerivativeInstrumentNoninterestIncomeExpense0.0450.0100.0100.0100.0100.0100.0
zions:InterestRateSwapsForCustomers, us-gaap:Nondesignated


Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value34312688646-14-14
Percentage of DerivativeInstrumentNoninterestIncomeExpense0.015600.0100.0100.0100.0100.0100.0
zions:OffsettingInterestRateDerivatives, us-gaap:Nondesignated


Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value-39-313-65-85-451718
Percentage of DerivativeInstrumentNoninterestIncomeExpense0.0-15650.0100.0100.0100.0100.0100.0

us-gaap:HedgingDesignation

us-gaap:DesignatedAsHedgingInstrument


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value723000100
Percentage of DerivativeInstrumentNoninterestIncomeExpense0.0100.0100.0100.0100.0100.0100.0100.0100.0
us-gaap:Nondesignated


Period End2020-06-302019-09-302019-06-302018-09-302018-06-30
Value212679
Percentage of DerivativeInstrumentNoninterestIncomeExpense0.0100.0100.0100.0100.0

zions:DilutiveEffectOfRestrictedStockAwardsAndUnits



Period End2020-03-312019-03-31
Value665000.00.0
Percentage of DilutiveEffectOfRestrictedStockAwardsAndUnits100.0100.0

zions:DilutiveEffectofCommonStockWarrants



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value07089901112
Percentage of DilutiveEffectofCommonStockWarrants100.0100.0100.0100.0100.0100.0100.0100.0100.0

zions:DilutiveEffectofStockOptions



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value000000001
Percentage of DilutiveEffectofStockOptions100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementEquityComponents

zions:EmployeePlansAccumulatedPaidinCapital

us-gaap:AdditionalPaidInCapital


Period End2020-03-312019-12-312019-09-302019-06-302019-03-31
Value896611
Percentage of EmployeePlansAccumulatedPaidinCapital100.0100.0100.0100.0100.0
us-gaap:Parent


Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value86611712
Percentage of EmployeePlansAccumulatedPaidinCapital100.0100.0100.0100.00.00.0

us-gaap:FairValueByAssetClass

zions:FairValueAssetsMeasuredOnRecurringBasisAndGainLossIncludedInEquitySecuritiesGainsLossesNet

us-gaap:PrivateEquityFunds


Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value-421-212-11
Percentage of FairValueAssetsMeasuredOnRecurringBasisAndGainLossIncludedInEquitySecuritiesGainsLossesNet100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:PrivateEquityFunds, us-gaap:FairValueInputsLevel3


Period End2020-06-302019-06-30
Value-4-2
Percentage of FairValueAssetsMeasuredOnRecurringBasisAndGainLossIncludedInEquitySecuritiesGainsLossesNet0.0100.0

us-gaap:FairValueByAssetClass

zions:FairValueMeasurementwithUnobservableInputsReconciliationRecurringBasisAssetNoninterestIncome

us-gaap:ServicingContracts


Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value-1002-1100
Percentage of FairValueMeasurementwithUnobservableInputsReconciliationRecurringBasisAssetNoninterestIncome100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:ServicingContracts, us-gaap:FairValueInputsLevel3


Period End2020-06-302019-06-30
Value02
Percentage of FairValueMeasurementwithUnobservableInputsReconciliationRecurringBasisAssetNoninterestIncome0.0100.0

zions:LoanRelatedFeesAndIncome



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value2726202117161917
Percentage of LoanRelatedFeesAndIncome100.0100.0100.0100.0100.0100.0100.0100.0

zions:LoansModifiedAsTroubledDebtRestructuringsLoans



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value11459-334-473626
Percentage of LoansModifiedAsTroubledDebtRestructuringsLoans100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementEquityComponents

zions:NetSharesIssuedFromStockWarrantExercises

us-gaap:CommonStock


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value000000000
Percentage of NetSharesIssuedFromStockWarrantExercises100.0100.0100.0100.0100.0100.0100.0100.0100.0

zions:Netchangeinothernoninterestbearinginvestments



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value88-298988-5954-1533
Percentage of Netchangeinothernoninterestbearinginvestments100.0100.0100.0100.0100.0100.0100.0100.0

zions:Netunrealizedgainslossesonothernoninterestbearinginvestments



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value-82-3-30-3-102
Percentage of Netunrealizedgainslossesonothernoninterestbearinginvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0

zions:NoninterestincomeCustomerrelatedFees



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value130143133140130122131126125
Percentage of NoninterestincomeCustomerrelatedFees100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

zions:AmegyCorporation


Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value3533373434313131
Percentage of NoninterestincomeCustomerrelatedFees24.524.826.426.227.923.724.624.8
zions:CaliforniaBankTrust


Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value2424222219231919
Percentage of NoninterestincomeCustomerrelatedFees16.818.015.716.915.617.615.115.2
zions:NationalBankOfArizona


Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value111110101010109
Percentage of NoninterestincomeCustomerrelatedFees7.78.37.17.78.27.67.97.2
zions:NevadaStateBank


Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value1111111110111010
Percentage of NoninterestincomeCustomerrelatedFees7.78.37.98.58.28.47.98.0
zions:OtherSegment


Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value1481278101111
Percentage of NoninterestincomeCustomerrelatedFees9.86.08.65.46.67.68.78.8
zions:VectraBankColorado


Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value87766666
Percentage of NoninterestincomeCustomerrelatedFees5.65.35.04.64.94.64.84.8
zions:ZionsBank


Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value3938403934393838
Percentage of NoninterestincomeCustomerrelatedFees27.328.628.630.027.929.830.230.4

us-gaap:ConsolidationItems

us-gaap:CorporateNonSegment


Period End2020-06-302019-06-30
Value1210
Percentage of NoninterestincomeCustomerrelatedFees9.27.7

us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, zions:AmegyCorporation


Period End2020-06-302019-06-30
Value3234
Percentage of NoninterestincomeCustomerrelatedFees24.626.2
us-gaap:OperatingSegments, zions:CaliforniaBankAndTrust


Period End2020-06-302019-06-30
Value1922
Percentage of NoninterestincomeCustomerrelatedFees14.616.9
us-gaap:OperatingSegments, zions:NevadaStateBank


Period End2020-06-302019-06-30
Value1011
Percentage of NoninterestincomeCustomerrelatedFees7.78.5
us-gaap:OperatingSegments, zions:VectraBankColorado


Period End2020-06-302019-06-30
Value86
Percentage of NoninterestincomeCustomerrelatedFees6.24.6
us-gaap:OperatingSegments, zions:ZionsBank


Period End2020-06-302019-06-30
Value3836
Percentage of NoninterestincomeCustomerrelatedFees29.227.7

us-gaap:StatementBusinessSegments

us-gaap:Corporate


Period End2020-03-312019-09-302019-03-312018-09-30
Value143140122126
Percentage of NoninterestincomeCustomerrelatedFees100.0100.0100.0100.0

zions:OtherCustomerRelatedFees



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value66655587
Percentage of OtherCustomerRelatedFees100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

zions:OtherNonInterestIncomeNonCustomerRelatedGainLoss

zions:AmegyCorporation


Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value10000000
Percentage of OtherNonInterestIncomeNonCustomerRelatedGainLoss100.0100.0100.0100.0100.0100.0100.0100.0
zions:CaliforniaBankTrust


Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value11100000
Percentage of OtherNonInterestIncomeNonCustomerRelatedGainLoss100.0100.0100.0100.0100.0100.0100.0100.0
zions:NationalBankOfArizona


Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value00010001
Percentage of OtherNonInterestIncomeNonCustomerRelatedGainLoss0.0100.0100.0100.0100.0100.0100.0100.0
zions:OtherSegment


Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value-1018511191012
Percentage of OtherNonInterestIncomeNonCustomerRelatedGainLoss-1000.0100.0100.0100.0100.0100.0100.0100.0
zions:ZionsBank


Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value-1000-1000
Percentage of OtherNonInterestIncomeNonCustomerRelatedGainLoss-100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidationItems

us-gaap:CorporateNonSegment


Period End2020-06-302019-06-30
Value-12-1
Percentage of OtherNonInterestIncomeNonCustomerRelatedGainLoss0.0100.0

us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, zions:AmegyCorporation


Period End2020-06-302019-06-30
Value-10
Percentage of OtherNonInterestIncomeNonCustomerRelatedGainLoss0.0100.0
us-gaap:OperatingSegments, zions:NationalBankOfArizona


Period End2020-06-302019-06-30
Value01
Percentage of OtherNonInterestIncomeNonCustomerRelatedGainLoss0.0100.0
us-gaap:OperatingSegments, zions:ZionsBank


Period End2020-06-302019-06-30
Value02
Percentage of OtherNonInterestIncomeNonCustomerRelatedGainLoss0.0100.0

us-gaap:StatementBusinessSegments

us-gaap:Corporate


Period End2020-03-312019-09-302019-03-312018-09-30
Value-961010
Percentage of OtherNonInterestIncomeNonCustomerRelatedGainLoss-900.0100.0100.0100.0
us-gaap:CorporateAndOther


Period End2020-06-302019-06-30
Value-132
Percentage of OtherNonInterestIncomeNonCustomerRelatedGainLoss0.0100.0

zions:OtherNoninterestBearingInvestmentsNonmarketableEquitySecuritiesGrossGains



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value3513214844
Percentage of OtherNoninterestBearingInvestmentsNonmarketableEquitySecuritiesGrossGains100.0100.0100.0100.0100.0100.0100.0100.0100.0

zions:OtherNoninterestBearingInvestmentsNonmarketableEquitySecuritiesGrossLosses



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value71110043653
Percentage of OtherNoninterestBearingInvestmentsNonmarketableEquitySecuritiesGrossLosses100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

zions:OtherNoninterestIncomeFromContractsWithCustomers

zions:AmegyCorporation


Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value0100000
Percentage of OtherNoninterestIncomeFromContractsWithCustomers100.0100.0100.0100.0100.0100.0100.0
zions:CaliforniaBankTrust


Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value1100010
Percentage of OtherNoninterestIncomeFromContractsWithCustomers100.0100.0100.0100.0100.0100.0100.0
zions:NationalBankOfArizona


Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value0000010
Percentage of OtherNoninterestIncomeFromContractsWithCustomers100.00.0100.0100.0100.0100.0100.0
zions:NevadaStateBank


Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value0000010
Percentage of OtherNoninterestIncomeFromContractsWithCustomers100.00.0100.0100.0100.0100.0100.0
zions:OtherSegment


Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value424-2335
Percentage of OtherNoninterestIncomeFromContractsWithCustomers100.0200.0100.0100.0100.0100.0100.0
zions:ZionsBank


Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value111-1111
Percentage of OtherNoninterestIncomeFromContractsWithCustomers100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidationItems

us-gaap:CorporateNonSegment


Period End2020-06-302019-06-30
Value53
Percentage of OtherNoninterestIncomeFromContractsWithCustomers0.0100.0

us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, zions:CaliforniaBankAndTrust


Period End2020-06-302019-06-30
Value01
Percentage of OtherNoninterestIncomeFromContractsWithCustomers0.0100.0

us-gaap:StatementBusinessSegments

us-gaap:Corporate


Period End2020-03-312019-09-302019-03-312018-09-30
Value6546
Percentage of OtherNoninterestIncomeFromContractsWithCustomers100.0100.0100.0100.0
us-gaap:CorporateAndOther


Period End2020-06-302019-06-30
Value65
Percentage of OtherNoninterestIncomeFromContractsWithCustomers0.0100.0

dei:LegalEntity

zions:OtherNoninterestIncomeLossNonASC606CustomerRelated

zions:AmegyCorporation


Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value9-11151311-899
Percentage of OtherNoninterestIncomeLossNonASC606CustomerRelated100.0100.0100.0100.0100.0100.0100.0100.0
zions:CaliforniaBankTrust


Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value88665744
Percentage of OtherNoninterestIncomeLossNonASC606CustomerRelated88.9-72.740.046.245.5-87.544.444.4
zions:CommerceBankOfWashington


Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value01000000
Percentage of OtherNoninterestIncomeLossNonASC606CustomerRelated0.0-9.10.00.00.0-0.00.00.0
zions:NationalBankOfArizona


Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value31343033
Percentage of OtherNoninterestIncomeLossNonASC606CustomerRelated33.3-9.120.030.827.3-0.033.333.3
zions:NevadaStateBank


Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value20332-122
Percentage of OtherNoninterestIncomeLossNonASC606CustomerRelated22.2-0.020.023.118.212.522.222.2
zions:OtherSegment


Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value9-43-10-121
Percentage of OtherNoninterestIncomeLossNonASC606CustomerRelated100.036.420.0-7.70.012.522.211.1
zions:VectraBankColorado


Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value31321022
Percentage of OtherNoninterestIncomeLossNonASC606CustomerRelated33.3-9.120.015.49.1-0.022.222.2
zions:ZionsBank


Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value581111000
Percentage of OtherNoninterestIncomeLossNonASC606CustomerRelated55.6-72.76.77.79.1-125.00.00.0

us-gaap:ConsolidationItems

us-gaap:CorporateNonSegment


Period End2020-06-302019-06-30
Value30
Percentage of OtherNoninterestIncomeLossNonASC606CustomerRelated0.00.0

us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, zions:AmegyCorporation


Period End2020-06-302019-06-30
Value810
Percentage of OtherNoninterestIncomeLossNonASC606CustomerRelated0.076.9
us-gaap:OperatingSegments, zions:CaliforniaBankAndTrust


Period End2020-06-302019-06-30
Value67
Percentage of OtherNoninterestIncomeLossNonASC606CustomerRelated0.053.8
us-gaap:OperatingSegments, zions:NationalBankOfArizona


Period End2020-06-302019-06-30
Value43
Percentage of OtherNoninterestIncomeLossNonASC606CustomerRelated0.023.1
us-gaap:OperatingSegments, zions:NevadaStateBank


Period End2020-06-302019-06-30
Value42
Percentage of OtherNoninterestIncomeLossNonASC606CustomerRelated0.015.4
us-gaap:OperatingSegments, zions:VectraBankColorado


Period End2020-06-302019-06-30
Value42
Percentage of OtherNoninterestIncomeLossNonASC606CustomerRelated0.015.4
us-gaap:OperatingSegments, zions:ZionsBank


Period End2020-06-302019-06-30
Value73
Percentage of OtherNoninterestIncomeLossNonASC606CustomerRelated0.023.1

us-gaap:StatementBusinessSegments

us-gaap:Corporate


Period End2020-03-312019-09-302019-03-312018-09-30
Value39342322
Percentage of OtherNoninterestIncomeLossNonASC606CustomerRelated433.3226.7209.1244.4
us-gaap:CorporateAndOther


Period End2020-06-302019-06-30
Value3627
Percentage of OtherNoninterestIncomeLossNonASC606CustomerRelated0.0207.7

zions:PrincipleAmountOfLoansHeldForSaleSold



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value608299373278132118136152206
Percentage of PrincipleAmountOfLoansHeldForSaleSold100.0100.0100.0100.0100.0100.0100.0100.0100.0

zions:ProvisionforCreditLosses



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value1682584102146111247
Percentage of ProvisionforCreditLosses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

zions:AmegyCorporation


Period End2020-03-312019-03-31
Value10315
Percentage of ProvisionforCreditLosses39.9375.0
zions:CaliforniaBankTrust


Period End2020-03-312019-03-31
Value383
Percentage of ProvisionforCreditLosses14.775.0
zions:CommerceBankOfWashington


Period End2020-03-312019-03-31
Value50
Percentage of ProvisionforCreditLosses1.90.0
zions:NationalBankOfArizona


Period End2020-03-312019-03-31
Value203
Percentage of ProvisionforCreditLosses7.875.0
zions:NevadaStateBank


Period End2020-03-312019-03-31
Value121
Percentage of ProvisionforCreditLosses4.725.0
zions:OtherSegment


Period End2020-03-312019-03-31
Value21
Percentage of ProvisionforCreditLosses0.825.0
zions:VectraBankColorado


Period End2020-03-312019-03-31
Value254
Percentage of ProvisionforCreditLosses9.7100.0
zions:ZionsBank


Period End2020-03-312019-03-31
Value5311
Percentage of ProvisionforCreditLosses20.5275.0

us-gaap:ConsolidationItems

us-gaap:CorporateNonSegment


Period End2020-06-302019-06-30
Value-3-1
Percentage of ProvisionforCreditLosses-1.8-4.8

us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, zions:AmegyCorporation


Period End2020-06-302019-06-30
Value25-8
Percentage of ProvisionforCreditLosses14.9-38.1
us-gaap:OperatingSegments, zions:CaliforniaBankAndTrust


Period End2020-06-302019-06-30
Value469
Percentage of ProvisionforCreditLosses27.442.9
us-gaap:OperatingSegments, zions:CommerceBankOfWashington


Period End2020-06-302019-06-30
Value52
Percentage of ProvisionforCreditLosses3.09.5
us-gaap:OperatingSegments, zions:NationalBankOfArizona


Period End2020-06-302019-06-30
Value162
Percentage of ProvisionforCreditLosses9.59.5
us-gaap:OperatingSegments, zions:NevadaStateBank


Period End2020-06-302019-06-30
Value400
Percentage of ProvisionforCreditLosses23.80.0
us-gaap:OperatingSegments, zions:VectraBankColorado


Period End2020-06-302019-06-30
Value-11
Percentage of ProvisionforCreditLosses-0.64.8
us-gaap:OperatingSegments, zions:ZionsBank


Period End2020-06-302019-06-30
Value4016
Percentage of ProvisionforCreditLosses23.876.2

us-gaap:StatementBusinessSegments

us-gaap:Corporate


Period End2020-03-312019-03-31
Value2584
Percentage of ProvisionforCreditLosses100.0100.0

zions:ProvisionforUnfundedLendingCommitmentsdecrease



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value718-3212107
Percentage of ProvisionforUnfundedLendingCommitmentsdecrease100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable

us-gaap:CommercialPortfolioSegment


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-312018-09-302018-06-30
Value11500-1213
Percentage of ProvisionforUnfundedLendingCommitmentsdecrease157.127.8-0.00.0-100.0200.0100.042.9
us-gaap:CommercialRealEstatePortfolioSegment


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-312018-09-302018-06-30
Value-311-122114
Percentage of ProvisionforUnfundedLendingCommitmentsdecrease-42.961.133.3100.0200.0100.0100.057.1
us-gaap:ConsumerPortfolioSegment


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-312018-09-302018-06-30
Value-12000000
Percentage of ProvisionforUnfundedLendingCommitmentsdecrease-14.311.1-0.00.00.00.0100.00.0

zions:RetailAndBusinessBankingFees



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value1519202020182019
Percentage of RetailAndBusinessBankingFees100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

zions:AmegyCorporation


Period End2020-03-312019-12-312019-09-302019-03-312018-12-312018-09-30
Value445444
Percentage of RetailAndBusinessBankingFees21.120.025.022.220.021.1
zions:CaliforniaBankTrust


Period End2020-03-312019-12-312019-09-302019-03-312018-12-312018-09-30
Value333343
Percentage of RetailAndBusinessBankingFees15.815.015.016.720.015.8
zions:NevadaStateBank


Period End2020-03-312019-12-312019-09-302019-03-312018-12-312018-09-30
Value333233
Percentage of RetailAndBusinessBankingFees15.815.015.011.115.015.8
zions:OtherSegment


Period End2020-03-312019-12-312019-09-302019-03-312018-12-312018-09-30
Value110011
Percentage of RetailAndBusinessBankingFees5.35.00.00.05.05.3
zions:ZionsBank


Period End2020-03-312019-12-312019-09-302019-03-312018-12-312018-09-30
Value566667
Percentage of RetailAndBusinessBankingFees26.330.030.033.330.036.8

us-gaap:ConsolidationItems

us-gaap:CorporateNonSegment


Period End2020-06-302019-06-30
Value02
Percentage of RetailAndBusinessBankingFees0.010.0

us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, zions:AmegyCorporation


Period End2020-06-302019-06-30
Value34
Percentage of RetailAndBusinessBankingFees20.020.0
us-gaap:OperatingSegments, zions:NevadaStateBank


Period End2020-06-302019-06-30
Value23
Percentage of RetailAndBusinessBankingFees13.315.0
us-gaap:OperatingSegments, zions:ZionsBank


Period End2020-06-302019-06-30
Value45
Percentage of RetailAndBusinessBankingFees26.725.0

us-gaap:StatementBusinessSegments

us-gaap:Corporate


Period End2020-03-312019-09-302019-03-312018-09-30
Value19201819
Percentage of RetailAndBusinessBankingFees100.0100.0100.0100.0
us-gaap:CorporateAndOther


Period End2020-06-302019-06-30
Value1520
Percentage of RetailAndBusinessBankingFees100.0100.0

zions:StockholdersEquityChangeInDeferredCompensation



Period End2020-06-30
Value1000000.0
Percentage of StockholdersEquityChangeInDeferredCompensation100.0

us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings


Period End2020-06-30
Value1000000.0
Percentage of StockholdersEquityChangeInDeferredCompensation100.0

dei:LegalEntity

zions:TotalnoninterestincomefromcontractswithcustomersASC606

zions:AmegyCorporation


Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value2644222123392222
Percentage of TotalnoninterestincomefromcontractswithcustomersASC606100.0100.0100.0100.0100.0100.0100.0100.0
zions:CaliforniaBankTrust


Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value1616161614161515
Percentage of TotalnoninterestincomefromcontractswithcustomersASC60661.536.472.776.260.941.068.268.2
zions:CommerceBankOfWashington


Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value10111111
Percentage of TotalnoninterestincomefromcontractswithcustomersASC6063.80.04.54.84.32.64.54.5
zions:NationalBankOfArizona


Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value8107671076
Percentage of TotalnoninterestincomefromcontractswithcustomersASC60630.822.731.828.630.425.631.827.3
zions:NevadaStateBank


Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value9118881288
Percentage of TotalnoninterestincomefromcontractswithcustomersASC60634.625.036.438.134.830.836.436.4
zions:OtherSegment


Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value51298811910
Percentage of TotalnoninterestincomefromcontractswithcustomersASC60619.227.340.938.134.828.240.945.5
zions:VectraBankColorado


Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value56445644
Percentage of TotalnoninterestincomefromcontractswithcustomersASC60619.213.618.219.021.715.418.218.2
zions:ZionsBank


Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value3430393833293838
Percentage of TotalnoninterestincomefromcontractswithcustomersASC606130.868.2177.3181.0143.574.4172.7172.7

us-gaap:ConsolidationItems

us-gaap:CorporateNonSegment


Period End2020-06-302019-06-30
Value910
Percentage of TotalnoninterestincomefromcontractswithcustomersASC6060.047.6

us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, zions:CaliforniaBankAndTrust


Period End2020-06-302019-06-30
Value1315
Percentage of TotalnoninterestincomefromcontractswithcustomersASC6060.071.4
us-gaap:OperatingSegments, zions:NationalBankOfArizona


Period End2020-06-302019-06-30
Value67
Percentage of TotalnoninterestincomefromcontractswithcustomersASC6060.033.3
us-gaap:OperatingSegments, zions:NevadaStateBank


Period End2020-06-302019-06-30
Value69
Percentage of TotalnoninterestincomefromcontractswithcustomersASC6060.042.9
us-gaap:OperatingSegments, zions:ZionsBank


Period End2020-06-302019-06-30
Value3133
Percentage of TotalnoninterestincomefromcontractswithcustomersASC6060.0157.1

us-gaap:StatementBusinessSegments

us-gaap:Corporate


Period End2020-03-312019-09-302019-03-312018-09-30
Value10410699104
Percentage of TotalnoninterestincomefromcontractswithcustomersASC606400.0481.8430.4472.7
us-gaap:CorporateAndOther


Period End2020-06-302019-06-30
Value94103
Percentage of TotalnoninterestincomefromcontractswithcustomersASC6060.0490.5

zions:UndistributedEarningsApplicabletoNonvestedShares



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value002111111
Percentage of UndistributedEarningsApplicabletoNonvestedShares100.0100.0100.0100.0100.0100.0100.0100.0100.0

zions:WealthManagementAndTrustFees



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value1516151615141414
Percentage of WealthManagementAndTrustFees100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

zions:AmegyCorporation


Period End2020-03-312019-12-312019-09-302019-03-312018-12-312018-09-30
Value433323
Percentage of WealthManagementAndTrustFees25.020.018.821.414.321.4
zions:CaliforniaBankTrust


Period End2020-03-312019-12-312019-09-302019-03-312018-12-312018-09-30
Value211111
Percentage of WealthManagementAndTrustFees12.56.76.27.17.17.1
zions:NationalBankOfArizona


Period End2020-03-312019-12-312019-09-302019-03-312018-12-312018-09-30
Value101011
Percentage of WealthManagementAndTrustFees6.20.06.20.07.17.1
zions:NevadaStateBank


Period End2020-03-312019-12-312019-09-302019-03-312018-12-312018-09-30
Value101111
Percentage of WealthManagementAndTrustFees6.20.06.27.17.17.1
zions:OtherSegment


Period End2020-03-312019-12-312019-09-302019-03-312018-12-312018-09-30
Value164433
Percentage of WealthManagementAndTrustFees6.240.025.028.621.421.4
zions:VectraBankColorado


Period End2020-03-312019-12-312019-09-302019-03-312018-12-312018-09-30
Value110010
Percentage of WealthManagementAndTrustFees6.26.70.00.07.10.0
zions:ZionsBank


Period End2020-03-312019-12-312019-09-302019-03-312018-12-312018-09-30
Value545444
Percentage of WealthManagementAndTrustFees31.226.731.228.628.628.6

us-gaap:ConsolidationItems

us-gaap:CorporateNonSegment


Period End2020-06-302019-06-30
Value15
Percentage of WealthManagementAndTrustFees6.733.3

us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, zions:AmegyCorporation


Period End2020-06-302019-06-30
Value43
Percentage of WealthManagementAndTrustFees26.720.0
us-gaap:OperatingSegments, zions:CaliforniaBankAndTrust


Period End2020-06-302019-06-30
Value21
Percentage of WealthManagementAndTrustFees13.36.7
us-gaap:OperatingSegments, zions:VectraBankColorado


Period End2020-06-302019-06-30
Value10
Percentage of WealthManagementAndTrustFees6.70.0
us-gaap:OperatingSegments, zions:ZionsBank


Period End2020-06-302019-06-30
Value64
Percentage of WealthManagementAndTrustFees40.026.7

us-gaap:StatementBusinessSegments

us-gaap:Corporate


Period End2020-03-312019-09-302019-03-312018-09-30
Value15151313
Percentage of WealthManagementAndTrustFees93.893.892.992.9
us-gaap:CorporateAndOther


Period End2020-06-302019-06-30
Value1514
Percentage of WealthManagementAndTrustFees100.093.3

us-gaap:AssetsFairValueDisclosure



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-312016-12-312015-12-312012-03-312011-12-312011-09-302010-12-312010-09-30
Value15577155901483215283157421605115619155691606914288847334673503426245013630
Percentage of AssetsFairValueDisclosure100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:FairValueInputsLevel1


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-312017-12-312016-12-312016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302010-12-312010-09-30
Value229152216263167153207286159167121209236210263273326269299313388326217214182166977938203
Percentage of AssetsFairValueDisclosure1.51.01.51.71.11.01.32.00.02.00.00.00.00.00.00.00.00.00.00.00.00.00.00.05.34.822.920.85.6
us-gaap:FairValueInputsLevel2


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-312017-12-312016-12-312016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302010-12-312010-09-30
Value1525415342144911489315451153461574913853930481726622515144953933343231693066269925521897195418811976206721002129207419591770
Percentage of AssetsFairValueDisclosure97.998.497.797.498.298.398.097.00.096.50.00.00.00.00.00.00.00.00.00.00.00.00.00.060.660.848.743.548.8
us-gaap:FairValueInputsLevel3


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-312017-12-312016-12-312016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302010-12-312010-09-30
Value9496125127124120113148136133133123565514636796799138711321161112910681172112611841207121016041656
Percentage of AssetsFairValueDisclosure0.60.60.80.80.80.80.71.00.01.60.00.00.00.00.00.00.00.00.00.00.00.00.00.034.234.528.435.645.6

us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FinancialInstrument

us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsNonrecurring


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value10077332249
Percentage of AssetsFairValueDisclosure0.00.00.00.00.00.00.20.20.1
us-gaap:FairValueInputsLevel2, zions:ImpairedLoans


Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value006632
Percentage of AssetsFairValueDisclosure0.00.00.00.00.2
us-gaap:FairValueInputsLevel2, zions:OtherRealEstateOwned


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value100110
Percentage of AssetsFairValueDisclosure0.00.00.00.00.00.0
us-gaap:FairValueInputsLevel3, us-gaap:FairValueMeasurementsNonrecurring


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value101100101
Percentage of AssetsFairValueDisclosure0.00.00.00.00.00.00.00.00.0
us-gaap:FairValueInputsLevel3, us-gaap:PrivateEquityFunds


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value101100101
Percentage of AssetsFairValueDisclosure0.00.00.00.00.00.00.00.00.0

us-gaap:FinancialInstrument

us-gaap:FairValueMeasurementsNonrecurring


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value201873332410
Percentage of AssetsFairValueDisclosure0.00.00.00.10.00.00.20.20.1
us-gaap:PrivateEquityFunds


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value101100101
Percentage of AssetsFairValueDisclosure0.00.00.00.00.00.00.00.00.0
zions:ImpairedLoans


Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value006632
Percentage of AssetsFairValueDisclosure0.00.00.00.00.2
zions:OtherRealEstateOwned


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value100110
Percentage of AssetsFairValueDisclosure0.00.00.00.00.00.0

us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax



Period End2020-06-302019-12-31
Value402126
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax100.0100.0

us-gaap:FinancialInstrument

us-gaap:AgencySecurities


Period End2020-06-302019-12-31
Value365
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax9.04.0
us-gaap:USStatesAndPoliticalSubdivisions


Period End2020-06-302019-12-31
Value6237
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax15.429.4
zions:AgencyGuaranteedMortgageBackedSecurities


Period End2020-06-302019-12-31
Value30483
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax75.665.9
zions:SmallBusinessAdministrationLoanBackedSecurities


Period End2020-06-302019-12-31
Value01
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax0.00.8

us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax



Period End2020-06-302019-12-31
Value4287
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax100.0100.0

us-gaap:FinancialInstrument

us-gaap:AgencySecurities


Period End2020-06-302019-12-31
Value14
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax2.44.6
zions:AgencyGuaranteedMortgageBackedSecurities


Period End2020-06-302019-12-31
Value242
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax4.848.3
zions:SmallBusinessAdministrationLoanBackedSecurities


Period End2020-06-302019-12-31
Value3941
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax92.947.1

us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis



Period End2020-06-302019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302013-12-31
Value138411368613994146591504515040150711501215215152411519915317156021333610260931585827571596245434430381934953661
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FinancialInstrument

us-gaap:AgencySecurities


Period End2020-06-302019-12-31
Value12411301
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis9.09.5
us-gaap:USStatesAndPoliticalSubdivisions


Period End2020-06-302019-12-31
Value12391282
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis9.09.4
us-gaap:USTreasurySecurities


Period End2020-06-302019-12-31
Value10025
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis0.70.2
zions:AgencyGuaranteedMortgageBackedSecurities


Period End2020-06-302019-12-31
Value99119518
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis71.669.5
zions:SmallBusinessAdministrationLoanBackedSecurities


Period End2020-06-302019-12-31
Value13251535
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis9.611.2

us-gaap:InformationByCategoryOfDebtSecurity

us-gaap:AgencySecurities


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value124113471301127713721407139414801830
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis9.00.09.59.19.49.49.39.812.0
us-gaap:USStatesAndPoliticalSubdivisions


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value123912651282131013221270130313131336
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis9.00.09.49.49.08.48.78.78.8
us-gaap:USTreasurySecurities


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value1002525254040402525
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis0.70.00.20.20.30.30.30.20.2
zions:AgencyGuaranteedMortgageBackedSecurities


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value99119918951897001011010236
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis71.60.069.569.369.068.1
zions:AvailableforsaleOtherdebtsecurities


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value252525262525
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis0.20.00.20.20.20.2
zions:SmallBusinessAdministrationLoanBackedSecurities


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value132514181535165617902042
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis9.60.011.211.812.213.6

us-gaap:InformationByCategoryOfDebtSecurity, zions:SecuritiesMaturity

us-gaap:AgencySecurities, zions:After10Years


Period End2020-06-302020-03-31
Value626659
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis4.50.0
us-gaap:AgencySecurities, zions:DueInOneYearOrLess


Period End2020-06-302020-03-31
Value611
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis0.40.0
us-gaap:AgencySecurities, zions:FiveYearsThrough10Years


Period End2020-06-302020-03-31
Value399408
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis2.90.0
us-gaap:AgencySecurities, zions:OneYearThroughFiveYears


Period End2020-06-302020-03-31
Value155279
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis1.10.0
us-gaap:USStatesAndPoliticalSubdivisions, zions:After10Years


Period End2020-06-302020-03-31
Value102103
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis0.70.0
us-gaap:USStatesAndPoliticalSubdivisions, zions:DueInOneYearOrLess


Period End2020-06-302020-03-31
Value8380
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis0.60.0
us-gaap:USStatesAndPoliticalSubdivisions, zions:FiveYearsThrough10Years


Period End2020-06-302020-03-31
Value494530
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis3.60.0
us-gaap:USStatesAndPoliticalSubdivisions, zions:OneYearThroughFiveYears


Period End2020-06-302020-03-31
Value560552
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis4.00.0
us-gaap:USTreasurySecurities, zions:DueInOneYearOrLess


Period End2020-06-302020-03-31
Value10025
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis0.70.0
zions:AgencyGuaranteedMortgageBackedSecurities, zions:After10Years


Period End2020-06-302020-03-31
Value87958714
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis63.50.0
zions:AgencyGuaranteedMortgageBackedSecurities, zions:FiveYearsThrough10Years


Period End2020-06-302020-03-31
Value9271075
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis6.70.0
zions:AgencyGuaranteedMortgageBackedSecurities, zions:OneYearThroughFiveYears


Period End2020-06-302020-03-31
Value187127
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis1.40.0
zions:SmallBusinessAdministrationLoanBackedSecurities, zions:After10Years


Period End2020-06-302020-03-31
Value11401229
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis8.20.0
zions:SmallBusinessAdministrationLoanBackedSecurities, zions:FiveYearsThrough10Years


Period End2020-06-302020-03-31
Value159166
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis1.10.0
zions:SmallBusinessAdministrationLoanBackedSecurities, zions:OneYearThroughFiveYears


Period End2020-06-302020-03-31
Value2623
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis0.20.0

zions:SecuritiesMaturity

zions:After10Years


Period End2020-06-30
Value10678
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis77.1
zions:DueInOneYearOrLess


Period