NWBI


Line plots across dimensions of each concept
Tables

Table of contents



us-gaap:CommonStockValue
us-gaap:StatementEquityComponents
us-gaap:SharesIssued

us-gaap:CommonStockSharesIssued

us-gaap:CommonStockSharesOutstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic
us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecurities
us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount

us-gaap:EarningsPerShareBasic

us-gaap:EarningsPerShareDiluted

us-gaap:InterestAndFeeIncomeLoansAndLeases

us-gaap:InsuranceCommissionsAndFees

us-gaap:GeneralAndAdministrativeExpense

us-gaap:InterestExpense

us-gaap:InterestIncomeExpenseNet

us-gaap:AllocatedShareBasedCompensationExpense

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments

us-gaap:IncomeTaxExpenseBenefit

us-gaap:ComprehensiveIncomeNetOfTax
us-gaap:StatementEquityComponents

us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic
us-gaap:StatementEquityComponents

us-gaap:Assets
us-gaap:SubsequentEventType

us-gaap:Liabilities

us-gaap:LiabilitiesAndStockholdersEquity

us-gaap:StockholdersEquity
us-gaap:StatementEquityComponents

us-gaap:AmortizationOfIntangibleAssets

us-gaap:PropertyPlantAndEquipmentNet

us-gaap:Goodwill
us-gaap:BusinessAcquisition

us-gaap:IntangibleAssetsNetExcludingGoodwill

us-gaap:FiniteLivedIntangibleAssetsNet
us-gaap:FiniteLivedIntangibleAssetsByMajorClass
us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:DebtAndCapitalLeaseObligations
us-gaap:FairValueByMeasurementBasis

us-gaap:StockholdersEquity
us-gaap:StatementEquityComponents

us-gaap:CommonStockValue

us-gaap:AdditionalPaidInCapitalCommonStock

us-gaap:RetainedEarningsAccumulatedDeficit

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
us-gaap:StatementEquityComponents

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:ShareBasedCompensation

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:PaymentsToAcquirePropertyPlantAndEquipment

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:PaymentsOfDividends
us-gaap:DebtInstrument, us-gaap:ShortTermDebtType
us-gaap:DebtInstrumentInterestRateStatedPercentage
us-gaap:TitleOfIndividual, us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents
us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecurities
nwbi:AverageSharePriceDuringTheReportingPeriod

nwbi:CashPaidForInterestOnDeposits

nwbi:CashPaidForInterestOnDepositsAndBorrowings

nwbi:FederalDepositInsuranceCorporationPremiumExpenseNet

nwbi:FeesAndCommissionsTrustServicesAndOtherIncome

nwbi:FinancingReceivableModificationAllowanceForCreditLosses
us-gaap:FinancingReceivablePortfolioSegment
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
nwbi:FinancingReceivableModificationsAmountPaidOff

nwbi:FinancingReceivableModificationsNumberOfContracts2Additions
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
nwbi:FinancingReceivableModificationsNumberOfContractsChargedOff
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
nwbi:FinancingReceivableModificationsNumberOfContractsPaidOff

nwbi:FinancingReceivableModificationsNumberOfContractsRemodified

nwbi:FinancingReceivableModificationsRecordedInvestmentAdditions

nwbi:FinancingReceivableModificationsRecordedInvestmentNetPaydowns

nwbi:FinancingReceivableModificationsRecordedInvestmentReModifications

nwbi:MortgageBankingIncome

nwbi:NoninterestExpenseCollectionOfReceivables

nwbi:OriginationsOfLoansReceivableHeldForInvestment

nwbi:RestructuringAndAcquisitionRelatedCosts

nwbi:TransferOfOtherRealEstateAndOtherRepossessedPersonalProperty

us-gaap:AccretionAmortizationOfDiscountsAndPremiumsInvestments

us-gaap:AllowanceForLoanAndLeaseLossesLoansSold

us-gaap:BankOwnedLifeInsuranceIncome
us-gaap:BusinessAcquisition
us-gaap:BusinessCombinationConsiderationTransferred1
us-gaap:BusinessAcquisition
us-gaap:BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable

us-gaap:CommonStockDividendsPerShareCashPaid

us-gaap:DebtAndEquitySecuritiesGainLoss
us-gaap:DerivativeInstrumentRisk, us-gaap:VariableRate, dei:LegalEntity
us-gaap:DebtInstrumentBasisSpreadOnVariableRate1
us-gaap:ScheduleOfSharesSubjectToMandatoryRedemptionBySettlementTerms, us-gaap:VariableRate, dei:LegalEntity
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAmortizationOfGainsLosses
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAmortizationOfPriorServiceCostCredit
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedReturnOnPlanAssets
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanInterestCost
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanServiceCost

us-gaap:DepreciationAmortizationAndAccretionNet
us-gaap:IncomeStatementLocation
us-gaap:DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet

us-gaap:DividendIncomeOperating

us-gaap:DividendsCash
us-gaap:StatementEquityComponents
us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases
us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales

us-gaap:FeesAndCommissionsMortgageBankingAndServicing

us-gaap:FinancingReceivableAllowanceForCreditLossPurchasedWithCreditDeteriorationIncrease
us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType
us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType, us-gaap:FinancingReceivablePortfolioSegment
us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
us-gaap:FinancingReceivablePortfolioSegment
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable

us-gaap:FinancingReceivableAllowanceForCreditLossesRecovery
us-gaap:FinancingReceivablePortfolioSegment
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable

us-gaap:FinancingReceivableAllowanceForCreditLossesWriteOffs
us-gaap:FinancingReceivablePortfolioSegment
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable

us-gaap:FinancingReceivableModificationsNumberOfContracts2
us-gaap:FinancingReceivablePortfolioSegment
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable

us-gaap:FinancingReceivableModificationsPostModificationRecordedInvestment2

us-gaap:FinancingReceivableModificationsPreModificationRecordedInvestment2
us-gaap:FinancingReceivablePortfolioSegment
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
us-gaap:FinancingReceivablesImpairedTroubledDebtRestructuringWriteDown

us-gaap:ForeclosedRealEstateExpense

us-gaap:GainLossOnSalesOfLoansNet

us-gaap:GainsLossesOnSalesOfAssets

us-gaap:GainsLossesOnSalesOfOtherRealEstate

us-gaap:GoodwillAcquiredDuringPeriod

us-gaap:ImpairedFinancingReceivableInterestIncomeAccrualMethod

us-gaap:ImpairmentOfRealEstate

us-gaap:IncomeTaxesPaid

us-gaap:IncreaseDecreaseInAdvancePaymentsByBorrowersForTaxesAndInsurance

us-gaap:IncreaseDecreaseInDeposits

us-gaap:IncreaseDecreaseInOtherOperatingAssets

us-gaap:IncreaseDecreaseInOtherOperatingLiabilities

us-gaap:InformationTechnologyAndDataProcessing

us-gaap:InterestAndDividendIncomeOperating

us-gaap:InterestExpenseBorrowings

us-gaap:InterestExpenseDeposits

us-gaap:InterestIncomeDepositsWithFinancialInstitutions

us-gaap:InterestIncomeExpenseAfterProvisionForLoanLoss

us-gaap:InterestIncomeSecuritiesMortgageBacked

us-gaap:InterestIncomeSecuritiesTaxExempt

us-gaap:InterestIncomeSecuritiesTaxable

us-gaap:LaborAndRelatedExpense

us-gaap:MarketingExpense

us-gaap:NoncashOrPartNoncashAcquisitionNetNonmonetaryAssetsAcquiredLiabilitiesAssumed1

us-gaap:NoncashOrPartNoncashAcquisitionValueOfAssetsAcquired1

us-gaap:NoncontrollingInterestIncreaseFromBusinessCombination
us-gaap:StatementEquityComponents

us-gaap:NoninterestExpense

us-gaap:NoninterestIncome

us-gaap:NoninterestIncomeOtherOperatingIncome

us-gaap:OccupancyNet

us-gaap:OciBeforeReclassificationsNetOfTaxAttributableToParent
us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent

us-gaap:OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent

us-gaap:OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax

us-gaap:OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationTaxParent

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTax

us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax

us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax

us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax

us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax

us-gaap:OtherComprehensiveIncomeLossTaxPortionAttributableToParent1

us-gaap:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax

us-gaap:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax

us-gaap:OtherNoninterestExpense

us-gaap:PaymentsForOriginationAndPurchasesOfLoansHeldForSale

us-gaap:PaymentsToAcquireAvailableForSaleSecuritiesDebt

us-gaap:PaymentsToAcquireBusinessesGross

us-gaap:PaymentsToAcquireBusinessesNetOfCashAcquired

us-gaap:ProceedsFromLifeInsurancePolicies

us-gaap:ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities

us-gaap:ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities

us-gaap:ProceedsFromPrincipalRepaymentsOnLoansAndLeasesHeldForInvestment

us-gaap:ProceedsFromSaleOfAvailableForSaleSecuritiesDebt

us-gaap:ProceedsFromSaleOfFederalHomeLoanBankStock

us-gaap:ProceedsFromSaleOfForeclosedAssets

us-gaap:ProceedsFromSaleOfLoansHeldForInvestment

us-gaap:ProceedsFromSaleOfLoansHeldForSale

us-gaap:ProceedsFromSaleOfRealEstateHeldforinvestment

us-gaap:ProceedsFromStockOptionsExercised

us-gaap:ProfessionalFees

us-gaap:ProvisionForLoanAndLeaseLosses

us-gaap:ProvisionForLoanLeaseAndOtherLosses
us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType
us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType, us-gaap:FinancingReceivablePortfolioSegment
us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
us-gaap:FinancingReceivablePortfolioSegment
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable

us-gaap:ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent
us-gaap:StatementEquityComponents

us-gaap:RepaymentsOfShortTermDebt
us-gaap:TitleOfIndividual
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod

us-gaap:StockGrantedDuringPeriodValueSharebasedCompensationForfeited

us-gaap:StockIssued1
us-gaap:BusinessAcquisition
us-gaap:StockIssuedDuringPeriodSharesAcquisitions
us-gaap:StatementEquityComponents
us-gaap:StatementEquityComponents
us-gaap:StockIssuedDuringPeriodSharesShareBasedCompensation
us-gaap:StatementEquityComponents
us-gaap:StockIssuedDuringPeriodSharesShareBasedCompensationForfeited
us-gaap:StatementEquityComponents
us-gaap:StockIssuedDuringPeriodSharesStockOptionsExercised

us-gaap:StockIssuedDuringPeriodValueAcquisitions
us-gaap:StatementEquityComponents

us-gaap:StockIssuedDuringPeriodValueStockOptionsExercised
us-gaap:StatementEquityComponents

us-gaap:WeightedAverageNumberDilutedSharesOutstandingAdjustment
us-gaap:FinancialInstrument
nwbi:AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsGrossUnrealizedGain
us-gaap:FinancialInstrument
nwbi:AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsGrossUnrealizedLoss
us-gaap:FinancialInstrument
nwbi:AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsGrossUnrealizedGain
us-gaap:FinancialInstrument
nwbi:AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsGrossUnrealizedLoss
us-gaap:FinancialInstrument
nwbi:AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsGrossUnrealizedGain
us-gaap:FinancialInstrument
nwbi:AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsGrossUnrealizedLoss
us-gaap:FinancialInstrument
nwbi:AvailableForSaleSecuritiesDebtMaturitiesOneYearOrLessGrossUnrealizedLoss
us-gaap:FinancialInstrument
nwbi:AvailableforsaleSecuritiesDebtMaturitiesafterFiveThroughTenYearsGrossUnrealizedGain
us-gaap:FinancialInstrument
nwbi:AvailableforsaleSecuritiesDebtMaturitiesafterFiveThroughTenYearsGrossUnrealizedLoss
us-gaap:FinancialInstrument
nwbi:AvailableforsaleSecuritiesDebtMaturitiesafterOneThroughFiveYearsGrossUnrealizedGain
us-gaap:FinancialInstrument
nwbi:AvailableforsaleSecuritiesDebtMaturitiesafterOneThroughFiveYearsGrossUnrealizedLoss
us-gaap:FinancialInstrument
nwbi:AvailableforsaleSecuritiesDebtMaturitiesafterTenYearsGrossUnrealizedGain
us-gaap:FinancialInstrument
nwbi:AvailableforsaleSecuritiesDebtMaturitiesafterTenYearsGrossUnrealizedLoss
us-gaap:FinancialInstrument
nwbi:AvailableforsaleSecuritiesDebtMaturitieswithinOneYearGrossUnrealizedGain
us-gaap:BusinessAcquisition
nwbi:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLoansReceivable

nwbi:CashCashEquivalentsAndMarketableSecurities
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument
nwbi:CollateralizedMortgageBackedSecuritiesAvailableForSale
us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument

nwbi:DebtSecuritiesAvailableForSaleAccruedInterestReceivable

nwbi:DebtSecuritiesHeldToMaturityAccruedInterestReceivable
us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:HedgingDesignation
nwbi:DerivativeEffectiveInterestRate

nwbi:FinancingReceivableAccruedInterestReceivable

nwbi:FinancingReceivableAllowanceForCreditLossModifications
us-gaap:FinancingReceivablePortfolioSegment
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable

nwbi:FinancingReceivableAmortizedCostOfCollateralDependentLoans
us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType
us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType, us-gaap:FinancingReceivablePortfolioSegment
us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
us-gaap:FinancingReceivablePortfolioSegment
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable

nwbi:FinancingReceivableBeforeAllowanceForCreditLossAndLoansHeldForSale

nwbi:FinancingReceivableModificationsOutstandingNumberOfContracts

nwbi:FinancingReceivableModificationsRecordedInvestmentAccrual

nwbi:FinancingReceivableModificationsRecordedInvestmentAdditionalCommitment
us-gaap:FinancingReceivablePortfolioSegment
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable

nwbi:FinancingReceivableModificationsRecordedInvestmentNonAccrual

nwbi:FinancingReceivableNonaccrualIncludingNonaccrualWithNoAllowance
us-gaap:FinancingReceivablePortfolioSegment
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable

nwbi:FinancingReceivableRecordedInvestment90DaysOrMorePastMaturityAndStillAccruing
us-gaap:FinancingReceivablePortfolioSegment
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable

nwbi:FinancingReceivableRevolvingConvertedToTermLoan
us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:InternalCreditAssessment
us-gaap:FinancingReceivablePortfolioSegment
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:InternalCreditAssessment

nwbi:FinancingReceivableTroubledDebtRestructuringExcludingNonaccrual
us-gaap:FinancingReceivablePortfolioSegment
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable

nwbi:HeldToMaturityAndAvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses2
us-gaap:InvestmentSecondaryCategorization, us-gaap:InvestmentType
us-gaap:InvestmentType

nwbi:HeldToMaturityAndAvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLosses1
us-gaap:InvestmentSecondaryCategorization, us-gaap:InvestmentType
us-gaap:InvestmentType

nwbi:HeldToMaturityAndAvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
us-gaap:InvestmentSecondaryCategorization, us-gaap:InvestmentType
us-gaap:InvestmentType

nwbi:HeldToMaturityAndAvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses1
us-gaap:InvestmentSecondaryCategorization, us-gaap:InvestmentType
us-gaap:InvestmentType

nwbi:HeldToMaturityAndAvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
us-gaap:InvestmentSecondaryCategorization, us-gaap:InvestmentType
us-gaap:InvestmentType

nwbi:HeldToMaturityAndAvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
us-gaap:InvestmentSecondaryCategorization, us-gaap:InvestmentType
us-gaap:InvestmentType

nwbi:LoansAndLeasesReceivableAllowanceExcludingUnallocated
us-gaap:FinancingReceivablePortfolioSegment
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
us-gaap:Range, us-gaap:FairValueByAssetClass, us-gaap:MeasurementInputType, us-gaap:ValuationTechnique
nwbi:LoansReceivableMeasurementInput
us-gaap:ScheduleOfSharesSubjectToMandatoryRedemptionBySettlementTerms, dei:LegalEntity
nwbi:NumberOfBusinessTrustsOwned
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument
nwbi:ResidentialMortgageBackedSecuritiesAvailableForSaleFairValueDisclosure
us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument
us-gaap:FairValueByFairValueHierarchyLevel
nwbi:SavingsAndDemandDeposits
us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:AccruedLiabilitiesFairValueDisclosure
us-gaap:FairValueByMeasurementBasis

us-gaap:AdvancePaymentsByBorrowersForTaxesAndInsurance
us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:AssetsFairValueDisclosure
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:AssetsOfDisposalGroupIncludingDiscontinuedOperation
us-gaap:FairValueByMeasurementBasis

us-gaap:AssetsSoldUnderAgreementsToRepurchaseInterestRate
us-gaap:DebtInstrument

us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
us-gaap:FinancialInstrument
us-gaap:FinancialInstrument, us-gaap:InvestmentSecondaryCategorization

us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
us-gaap:FinancialInstrument
us-gaap:FinancialInstrument, us-gaap:InvestmentSecondaryCategorization

us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis
us-gaap:FinancialInstrument
us-gaap:FinancialInstrument, us-gaap:InvestmentSecondaryCategorization
us-gaap:FinancialInstrument
us-gaap:AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost
us-gaap:FinancialInstrument
us-gaap:AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue
us-gaap:FinancialInstrument
us-gaap:AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost
us-gaap:FinancialInstrument
us-gaap:AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue
us-gaap:FinancialInstrument
us-gaap:AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost
us-gaap:FinancialInstrument
us-gaap:AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue
us-gaap:FinancialInstrument
us-gaap:AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost
us-gaap:FinancialInstrument
us-gaap:AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue

us-gaap:AvailableForSaleSecuritiesDebtSecurities
us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument, us-gaap:InvestmentSecondaryCategorization
us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument
us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument, us-gaap:InvestmentSecondaryCategorization
us-gaap:FinancialInstrument
us-gaap:FinancialInstrument, us-gaap:InvestmentSecondaryCategorization

us-gaap:BankOwnedLifeInsurance
us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:CashAndCashEquivalentsFairValueDisclosure
us-gaap:FairValueByMeasurementBasis

us-gaap:CashAndDueFromBanks
us-gaap:DerivativeInstrumentRisk, us-gaap:VariableRate, dei:LegalEntity
us-gaap:DebtInstrumentInterestRateEffectivePercentage
us-gaap:ScheduleOfSharesSubjectToMandatoryRedemptionBySettlementTerms, us-gaap:VariableRate, dei:LegalEntity
us-gaap:Range, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedFutureEmployerContributionsRemainderOfFiscalYear

us-gaap:Deposits
us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:DepositsFairValueDisclosure
us-gaap:FairValueByMeasurementBasis

us-gaap:DepositsMoneyMarketDeposits

us-gaap:DepositsSavingsDeposits

us-gaap:DerivativeAssetNotionalAmount
us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation

us-gaap:DerivativeAssets
us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByMeasurementBasis
us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FinancialInstrument
us-gaap:FairValueByMeasurementBasis, us-gaap:FinancialInstrument
us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument

us-gaap:DerivativeLiabilities
us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByMeasurementBasis
us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument, us-gaap:HedgingDesignation
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FinancialInstrument
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FinancialInstrument, us-gaap:HedgingDesignation
us-gaap:FairValueByMeasurementBasis, us-gaap:FinancialInstrument
us-gaap:FairValueByMeasurementBasis, us-gaap:FinancialInstrument, us-gaap:HedgingDesignation
us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument
us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument, us-gaap:HedgingDesignation

us-gaap:DerivativeLiabilityNotionalAmount
us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation
us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation
us-gaap:DerivativeNotionalAmount
us-gaap:AwardType
us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue

us-gaap:FederalHomeLoanBankStock
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:FinancialLiabilitiesFairValueDisclosure
us-gaap:FairValueByMeasurementFrequency

us-gaap:FinancingReceivableAllowanceForCreditLosses
us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType
us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType, us-gaap:FinancingReceivablePortfolioSegment
us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
us-gaap:FinancingReceivablePortfolioSegment
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable

us-gaap:FinancingReceivableBeforeAllowanceForCreditLossAndFee
us-gaap:FinancingReceivablePortfolioSegment
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable

us-gaap:FinancingReceivableModificationsRecordedInvestment
us-gaap:FinancingReceivablePortfolioSegment
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable

us-gaap:FinancingReceivableNonaccrualNoAllowance
us-gaap:FinancingReceivablePortfolioSegment
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable

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

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

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

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

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

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

us-gaap:FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing
us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType, us-gaap:FinancingReceivablePortfolioSegment
us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
us-gaap:FinancingReceivablePortfolioSegment
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable

us-gaap:FinancingReceivableRecordedInvestmentCurrent
us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType, us-gaap:FinancingReceivablePortfolioSegment
us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
us-gaap:FinancingReceivablePortfolioSegment
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable

us-gaap:FinancingReceivableRecordedInvestmentNonaccrualStatus
us-gaap:FinancingReceivablePortfolioSegment
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable

us-gaap:FinancingReceivableRecordedInvestmentPastDue

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

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

us-gaap:FinancingReceivableUnamortizedLoanCommitmentOriginationFeeAndPremiumDiscount
us-gaap:FiniteLivedIntangibleAssetsByMajorClass
us-gaap:FiniteLivedIntangibleAssetsAccumulatedAmortization
us-gaap:BusinessAcquisition, us-gaap:FiniteLivedIntangibleAssetsByMajorClass
us-gaap:FiniteLivedIntangibleAssetsGross
us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:HeldToMaturitySecurities
nwbi:CreditRating
us-gaap:FinancialInstrument
us-gaap:FinancialInstrument, nwbi:CreditRating

us-gaap:HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain
us-gaap:FinancialInstrument
us-gaap:FinancialInstrument, us-gaap:InvestmentSecondaryCategorization

us-gaap:HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss
us-gaap:FinancialInstrument
us-gaap:FinancialInstrument, us-gaap:InvestmentSecondaryCategorization

us-gaap:HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment
us-gaap:FinancialInstrument
us-gaap:FinancialInstrument, us-gaap:InvestmentSecondaryCategorization

us-gaap:HeldToMaturitySecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasis
us-gaap:FinancialInstrument

us-gaap:HeldToMaturitySecuritiesDebtMaturitiesSingleMaturityDateFairValue
us-gaap:FinancialInstrument

us-gaap:HeldToMaturitySecuritiesFairValue
us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:FairValueByMeasurementBasis
us-gaap:FinancialInstrument
us-gaap:FinancialInstrument, us-gaap:InvestmentSecondaryCategorization

us-gaap:InterestBearingDomesticDepositChecking

us-gaap:InterestPayableCurrentAndNoncurrent
us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship
us-gaap:InterestRateCashFlowHedgeGainLossToBeReclassifiedDuringNext12MonthsNet
us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:HedgingDesignation

us-gaap:InterestReceivable
us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:InvestmentInFederalHomeLoanBankStockFairValueDisclosure
us-gaap:FairValueByMeasurementBasis

us-gaap:JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrust
us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:FairValueByMeasurementBasis
us-gaap:ScheduleOfSharesSubjectToMandatoryRedemptionBySettlementTerms, dei:LegalEntity
us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:LiabilitiesFairValueDisclosure
us-gaap:FairValueByMeasurementBasis
us-gaap:DebtInstrument
us-gaap:LineOfCredit
us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
us-gaap:LoansAndLeasesReceivableGrossCarryingAmount
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable

us-gaap:LoansAndLeasesReceivableNetOfDeferredIncome
us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:LoansReceivableFairValueDisclosure
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument
us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument

us-gaap:LoansReceivableHeldForSaleAmount
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable

us-gaap:NoninterestBearingDomesticDepositChecking

us-gaap:NotesReceivableGross

us-gaap:NotesReceivableNet
us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType

us-gaap:OtherAssets

us-gaap:OtherLiabilities
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:OtherRealEstate
us-gaap:FairValueByMeasurementFrequency

us-gaap:RealEstateAcquiredThroughForeclosure

us-gaap:SecuritiesSoldUnderAgreementsToRepurchase
us-gaap:DebtInstrument

us-gaap:ShortTermBorrowings
us-gaap:DebtInstrument
us-gaap:DebtInstrument, us-gaap:ShortTermDebtType
us-gaap:ShortTermDebtType

us-gaap:TimeDeposits

Tables

  2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:CommonStockValue █▄▄▄▄▄▃▃▃▃▃▃▃▃▃▃▃▃▃▃▁▁▁▁▁▁▁▁▁▁▁▂▂▂▂▂▃▄▄1278000.01069000.01069000.01067000.01066000.01062000.01034000.01033000.01031000.01026000.01027000.01026000.01025000.01020000.01017000.01013000.01025000.01018000.01019000.01017000.0947000.0946000.0947000.0950000.0949000.0945000.0943000.0942000.0939000.0938000.0937000.0978000.0979000.0976000.0975000.0976000.01033000.01078000.01103000.0NANANANANANANA
 us-gaap:SharesIssued us-gaap:StatementEquityComponents us-gaap:CommonStock█▄▄▄▄▄▃▃▃▃▃▃▃▃▃▃▃▃▃▃▁▁▁▁▁▁▁▁▁▁▁▂▂▂▂▂▃▄▄▅▅▄▄127.8384106.933483106.859088106.658067106.614607106.22003103.35403103.29348103.12289102.599662102.394828102.565667102.478146101.987942101.699406101.268648102.472947101.848509101.871737101.72511294.74074994.5533594.72145394.99481994.94969594.4644394.24371394.15204293.87784793.80233593.6529697.84438297.88087497.59339697.49304697.576368103.266045107.733432110.295117110.806418110.775014110.680962110.641858NANANA
us-gaap:CommonStockSharesIssued █▄▄▄▄▄▃▃▃▃▃▃▃▃▃▃▃▃▃▃▁▁▁▁▁▁▁▁▁▁▁▂▂▂▂▂▃▄▄127.8384106.933483106.859088106.658067106.614607106.22003103.35403103.29348103.12289102.599662102.394828102.565667102.478146101.987942101.699406101.268648102.472947101.848509101.871737101.72511294.74074994.5533594.72145394.99481994.94969594.4644394.24371394.15204293.87784793.80233593.6529697.84438297.88087497.59339697.49304697.576368103.266045107.733432110.295117NANANANANANANA
us-gaap:CommonStockSharesOutstanding █▁▁▁127.8384106.933483106.859088106.658067NANA103.35403NANANANANANANANANANANANANANANANANANANANA94.15204293.877847NA93.6529697.84438297.880874NA97.493046NANANANANANANANANANANA
us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding █▁121.480563106.148247NA106.270544106.258215104.496592NA103.942695103.424154103.136497NA102.564476102.449693102.480549NA101.068245100.24344299.380009NA95.82579891.99800591.902071NA92.11815492.53114292.353312NA91.82438490.91713690.878903NA94.61065694.50087794.665333NA97.124328102.536202107.25832NA108.914069108.960333NANANANANA
us-gaap:WeightedAverageNumberOfSharesOutstandingBasic █▁121.480563105.882553NA105.517707105.233635103.101789NA102.334954101.870043101.598928NA101.163534100.950772100.653277NA99.60253599.17760998.889744NA95.25680791.53817291.634064NA91.74551291.49165491.154998NA90.76040290.42371790.403909NA94.42287894.29495694.115522NA96.918016102.216892106.571262NA108.340566108.227678NANANANANA
 us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecurities nwbi:EmployeeAndDirectorsStockOptions4896026.0NANANANANANANANANANANANANANANANA521786.0NA534482.01711080.03744878.0NA584711.0NANANANANANANANANANANANANANANANANANANANANANA
us-gaap:EarningsPerShareBasic ▁▄▇█▇▇▇▇▇▇▆▆█▅▇▅▁▅▅▅▅▅▆▆▅▅▆▆▅▅▅▅▅▅▅▅▅▅▄▅▅▄▂▄▄▄-0.050.080.240.320.250.240.260.270.260.250.220.230.310.180.240.14-0.070.180.160.140.170.180.190.190.140.160.220.190.150.170.180.170.170.160.160.170.150.160.120.140.150.120.010.110.070.11
us-gaap:EarningsPerShareDiluted ▁▄▇█▇▇▇▇▇▇▆▇█▅▇▅▁▆▅▅▅▆▆▆▅▅▆▆▅▅▆▅▅▅▅▅▅▅▄▅▅▄▂▄▄▄-0.050.070.240.310.250.240.260.270.250.240.220.230.30.170.240.14-0.070.180.160.130.170.180.190.190.140.160.220.190.150.170.180.170.170.160.160.170.150.160.120.140.150.120.010.110.070.11
  2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:InterestAndFeeIncomeLoansAndLeases █▆▇██▆▆▅▅▄▅▄▄▄▄▄▄▃▃▂▁▁▁▁▁▁▁▁▂▂▃▃▃▃▃▃▃▃▄▄▄▃103.01294.97397.866101.091100.91794.93592.51290.73388.10685.2287.15485.37384.71482.75183.17882.43582.64580.78180.88276.08770.98570.71171.18270.8270.79769.37370.84971.4871.98773.47476.70177.10977.42278.15979.9380.56279.99380.45783.09683.37281.73480.746NANANANA
us-gaap:InsuranceCommissionsAndFees ▆▆▄▄▅▅▄▅▅█▄▅▆█▇▇██▇▆▆▆▅▄▆▇▅▅▅▆▂▂▃▃▃▄▄▂▂▂▂▁2.3952.3721.8581.8872.1452.1781.9062.0462.092.7491.8741.9922.3532.7942.4992.5412.7682.7142.492.3982.212.4282.1811.7782.2372.5642.1312.0192.192.2951.4631.481.6031.7181.5821.7961.791.381.3621.3931.2931.142NANANANA
us-gaap:GeneralAndAdministrativeExpense ▄▃▆▂▄▂▃▄▅▃▆▅▇▇█▄▃▃█▅▄▄▄▃▅▅▅▄▅▂▃▂▃▃▃▂▂▂▂█▁▂3.7113.3824.0973.1973.7083.1313.4553.5083.7683.4084.0113.9394.174.2224.3953.73.3433.464.5043.8923.5083.683.6773.4193.8683.7573.8233.4973.8663.2683.4193.1413.343.3243.2863.2093.2553.13.2334.462.9343.237NANANANA
us-gaap:InterestExpense ▂▃▃▃▃▂▂▂▁▁▁▁▁▁▁▁▂▃▃▃▃▃▃▃▃▃▃▃▃▃▄▄▄▅▅▅▅▅▆▆▆▇████10.46913.1514.47315.9314.20412.30710.9379.7888.6497.7667.3216.9947.0666.697.0917.45410.00813.74614.48614.1513.79213.89913.98214.18714.21414.20414.80515.27615.43615.64517.0418.2219.09620.84322.26823.01923.46224.05225.78727.35928.67731.10432.83333.58634.56134.826
us-gaap:InterestIncomeExpenseNet █▆▆▇▇▆▆▆▆▅▆▆▅▅▅▅▄▄▃▃▂▂▂▂▂▂▂▂▂▂▃▃▃▃▃▃▃▃▃▃▂▂▁▁▁▁98.07887.22888.94590.93692.60387.98286.83185.81784.22681.76784.2483.23782.73180.57782.94278.64676.68671.55271.15366.94162.17861.57862.2261.88962.14760.89762.04962.51263.32764.48966.61565.99465.96165.40666.53867.01266.67967.0467.2366.6563.72760.03458.04456.84256.40557.366
us-gaap:AllocatedShareBasedCompensationExpense ▄▄1500000.01500000.0NA1700000.02500000.01200000.0NA1300000.02300000.0978000.0NA1100000.01700000.0918000.0NA6400000.01900000.01200000.0NA1000000.01400000.0898000.0NA1300000.01800000.01200000.0NA1200000.01500000.01100000.0NA1100000.0NANANANANANANANANANANANANANA
us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments ▁▃▆█▇▆▇▇▆▆▆▇█▆▇▅▁▆▅▅▅▅▅▅▄▅▆▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▂▄▄▄-7.3398.95632.36443.20733.78731.75334.01434.77533.19931.92528.72436.00545.38425.79836.85518.894-10.49926.06524.87718.1122.51822.99523.53523.25817.1819.90629.45223.35218.52921.73722.36522.21123.86921.48321.63823.54221.08424.74417.78121.55923.21918.486-3.39816.019.64717.394
us-gaap:IncomeTaxExpenseBenefit ▂▃▅▆▅▅▅▅▅▅▅▇█▆▇▄▁▆▆▅▅▅▅▅▄▅▆▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▁▄▄▅-1.1391.0176.7739.7937.4046.7097.5477.0356.96.946.57612.41414.4028.05212.3614.697-3.4918.0818.6845.2387.2136.8256.195.9264.4655.2669.0895.7525.0516.4396.046.5187.5086.3026.4636.8226.0817.4915.0436.0687.0785.333-4.4043.9562.3565.092
us-gaap:ComprehensiveIncomeNetOfTax ▂▅▅██▇▇▆▆▆▅▆█▅▅▄▁▆▄▅▄▅▂▅▅▅▇▅▃▅▆▅▅▅▂▅▅▅▃▅▅▄-1.73315.97316.34734.93632.19929.70531.4626.14425.42721.5915.67523.13232.65518.91616.14614.071-5.56721.56111.71815.39513.94519.317-0.36215.88515.59418.44527.50418.1463.86616.81124.46317.17316.47317.189-1.79617.15418.83220.2326.62415.33318.64713.399NANANANA
 us-gaap:ComprehensiveIncomeNetOfTax us-gaap:StatementEquityComponents us-gaap:AccumulatedOtherComprehensiveIncome▇█▃▆▇▇▇▅▆▃▄▆▆▆▄▆▆▇▅▆▅▇▁▅▇▇█▆▃▆█▆▆▆▁▆▇▇▄▆▆▆4.4678.034-9.2441.5225.8164.6614.993-1.596-0.872-10.141-6.473-0.4591.6731.17-8.348-0.1261.4413.577-4.4752.523-1.363.147-17.707-1.4472.8793.8057.1410.546-9.6121.5138.1381.480.1122.008-16.9710.4343.8292.979-6.114-0.1582.5060.246NANANANA
 us-gaap:ComprehensiveIncomeNetOfTax us-gaap:StatementEquityComponents us-gaap:RetainedEarnings▁▄▇█▇▇▇▇▇█▆▆█▅▆▅▁▅▅▄▅▅▅▅▄▅▆▅▅▅▅▅▅▅▅▅▅▅▄▅▅▄-6.27.93925.59133.41426.38325.04426.46727.7426.29931.73122.14823.59130.98217.74624.49414.197-7.00817.98416.19312.87215.30516.1717.34517.33212.71514.6420.36317.613.47815.29816.32515.69316.36115.18115.17516.7215.00317.25312.73815.49116.14113.153NANANANA
us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic ▁▄▇█▇▇▇▇▇▇▆▆█▅▆▅▁▅▅▄▅▅▅▅▄▅▆▅▅▅▅▅▅▅▅▅▅▅▄▅▅▄▂▄▃▄-6.27.93925.59133.41426.38325.04426.46727.7426.29924.98522.14823.59130.98217.74624.49414.197-7.00817.98416.19312.87215.30516.1717.34517.33212.71514.6420.36317.613.47815.29816.32515.69316.36115.18115.17516.7215.00317.25312.73815.49116.14113.1531.00612.0547.29112.302
 us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic us-gaap:StatementEquityComponents us-gaap:RetainedEarnings▁▄▇█▇▇▇▇▇▇▆▆█▅▆▅▁▅▅▄▅▅▅▅▄▅▆▅▅▅▅▅▅▅▅▅▅▅-6.27.93925.59133.41426.38325.04426.46727.7426.29924.98522.14823.59130.98217.74624.49414.197-7.00817.98416.19312.87215.30516.1717.34517.33212.71514.6420.36317.613.47815.29816.32515.69316.36115.18115.17516.7215.00317.253NANANANANANANANA
  2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
  2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
  2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:Assets █▄▄▄▄▄▃▃▃▃▃▃▃▃▃▃▂▂▂▂▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁13845.08410681.19610493.90810580.47410505.48310297.0889607.7739575.3319562.3099520.9799363.9349459.8149499.019731.5239623.649714.6078963.9758916.2888951.8998934.9087864.517890.3597775.0337826.9267902.3167974.967881.4767908.3797963.8147994.497942.68047.6718037.9968069.0087957.7057989.3438087.3458122.2048148.1558142.7858136.133NA8025.298NANANA
us-gaap:Liabilities █▄▄▄▄▄▃▃▃▃▃▃▃▃▃▃▂▂▂▂▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁12314.2359339.4049140.6239228.7049171.8958980.8128350.1358334.6558333.4298305.7258156.218253.9678302.088553.968452.9778551.8047808.527745.77788.7367773.5716796.166822.8436712.3866750.2056829.8446817.4046724.6746769.8456835.5816846.916814.1316873.0456868.8546906.5336802.8016822.5666860.2046835.0886840.705NANANANANANANA
us-gaap:LiabilitiesAndStockholdersEquity █▄▄▄▄▄▃▃▃▃▃▃▃▃▃▃▂▂▂▂▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁13845.08410681.19610493.90810580.47410505.48310297.0889607.7739575.3319562.3099520.9799363.9349459.8149499.019731.5239623.649714.6078963.9758916.2888951.8998934.9087864.517890.3597775.0337826.9267902.3167974.967881.4767908.3797963.8147994.497942.68047.6718037.9968069.0087957.7057989.3438087.3458122.2048148.155NANANANANANANA
us-gaap:StockholdersEquity █▅▅▅▅▅▄▄▃▃▃▃▃▃▃▂▂▃▃▂▁▁▁▁▁▂▂▂▂▂▂▃▃▂▂▃▃▄▅▅▅▅▅1530.8491341.7921353.2851351.771333.5881316.2761257.6381240.6761228.881215.2541207.7241205.8471196.931177.5631170.6631162.8031155.4551170.5881163.1631161.3371068.351067.5161062.6471076.7211072.4721157.5561156.8021138.5341128.2331147.581128.4691174.6261169.1421162.4751154.9041166.7771227.1411287.1161307.451315.2221310.7231302.081316.515NANANA
  2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
  2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:AmortizationOfIntangibleAssets █▇▇██▆▆▆▇▇▇▇███▅▃▃▃▂▁▁▁▁▁▁▁▁▂▂▁▁▁▁▂▂▂▂▂▃▃▃1760000.01651000.01634000.01702000.01760000.01447000.01346000.01462000.01520000.01520000.01575000.01691000.01749000.01749000.01806000.01068000.0710000.0675000.0729000.0422000.0269000.0268000.0331000.0330000.0331000.0331000.0222000.0291000.0349000.0348000.0219000.0219000.0279000.0295000.0374000.0475000.0479000.0491000.0518000.0725000.0759000.0782000.0NANANANA
us-gaap:PropertyPlantAndEquipmentNet █▅▅▅▅▅▄▄▄▅▅▆▆▇▇█▅▆▆▆▄▄▄▄▄▅▄▄▃▃▃▃▃▂▂▁▁▁▁166.966147.427147.409148.796148.973149.623143.39144.612146.276148.184151.944152.761154.785159.823161.185167.596151.643153.0154.351153.841142.302142.481143.909144.759145.344146.88146.139142.487140.573138.95138.824135.455135.004133.599132.152126.047126.303126.855128.101NANANANANANANA
us-gaap:Goodwill █▇▇▇▇▇▅▅▅▅▅▅▅▅▅▅▄▄▄▄▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁386.044346.103346.103344.72344.72344.72307.42307.42307.42307.42307.42307.42307.42307.42307.42307.711262.14261.736261.736261.319175.498175.498175.323176.169175.988175.988174.463174.463174.463174.463174.461171.882171.882171.882171.882171.882171.882171.882171.882NANANA171.363NANANA
us-gaap:IntangibleAssetsNetExcludingGoodwill ▆▅▆▆▆▆▅▅▆▆▆▇▇▇██▂▃▃▃▁▁▁▁▂▂▁▁▁▁▁▁▁▁▁▁▁▁▂23.38121.42523.07622.4124.11225.87219.82121.16722.62924.14925.66927.24428.93530.68432.43333.9018.0958.3988.9829.7122.7593.0273.0333.3643.6944.0252.3192.5412.8323.1813.5291.331.5491.8282.1232.4972.9723.4513.942NANANANANANANA
us-gaap:FiniteLivedIntangibleAssetsNet ▆▁▅▄█23.38121.42523.07622.4124.112NA19.821NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
  2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
 us-gaap:DebtAndCapitalLeaseObligations us-gaap:FairValueByFairValueHierarchyLevel us-gaap:FairValueInputsLevel1█▃▄▄▂▁▄▃▁▁▁▁▁▂▂▂▂▂▁▂▂442.215194.224246.341255.26171.677114.081234.389179.11199.889104.558108.238115.388110.24137.191142.899135.891139.652142.424118.664132.862138.687NA162.714NANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:DebtAndCapitalLeaseObligations us-gaap:FairValueByFairValueHierarchyLevel us-gaap:FairValueInputsLevel3▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁█▇██▇0.00.00.00.00.00.00.00.00.00.00.00.00.2010.00.00.0820.186734.739879.863825.021786.631NA756.898NANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:DebtAndCapitalLeaseObligations us-gaap:FairValueByMeasurementBasis us-gaap:CarryingReportedAmountFairValueDisclosure▄▂▂▂▂▁▂▂▁▁▁▁▁▁▁▁█▇██▇440.079191.599246.336255.257171.677114.081234.389179.11799.889104.558108.238115.388110.441137.191142.899135.891959.969857.754975.007927.219899.056NA888.109NANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:DebtAndCapitalLeaseObligations us-gaap:FairValueByMeasurementBasis us-gaap:EstimateOfFairValueFairValueDisclosure▄▂▂▂▂▁▂▂▁▁▁▁▁▁▁▁█▇██▇442.215194.224246.341255.26171.677114.081234.389179.11199.889104.558108.238115.388110.441137.191142.899135.891959.838877.163998.527957.883925.318NA919.612NANANANANANANANANANANANANANANANANANANANANANANA
  2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:StockholdersEquity █▅▅▅▅▅▄▄▃▃▃▃▃▃▃▂▂▃▃▂▁▁▁▁▁▂▂▂▂▂▂▃▃▂▂▃▃▄▅▅▅▅▅1530.8491341.7921353.2851351.771333.5881316.2761257.6381240.6761228.881215.2541207.7241205.8471196.931177.5631170.6631162.8031155.4551170.5881163.1631161.3371068.351067.5161062.6471076.7211072.4721157.5561156.8021138.5341128.2331147.581128.4691174.6261169.1421162.4751154.9041166.7771227.1411287.1161307.451315.2221310.7231302.081316.515NANANA
us-gaap:CommonStockValue █▄▄▄▄▄▃▃▃▃▃▃▃▃▃▃▃▃▃▃▁▁▁▁▁▁▁▁▁▁▁▂▂▂▂▂▃▄▄1278000.01069000.01069000.01067000.01066000.01062000.01034000.01033000.01031000.01026000.01027000.01026000.01025000.01020000.01017000.01013000.01025000.01018000.01019000.01017000.0947000.0946000.0947000.0950000.0949000.0945000.0943000.0942000.0939000.0938000.0937000.0978000.0979000.0976000.0975000.0976000.01033000.01078000.01103000.0NANANANANANANA
us-gaap:AdditionalPaidInCapitalCommonStock █▄▄▄▄▄▃▃▃▃▃▃▃▃▃▃▃▃▃▃▁▁▁▁▁▁▁▁▁▁▁▂▂▂▂1023.083808.25805.75801.382798.942795.044745.926742.863739.673734.065730.719728.163726.036723.055718.834711.974722.98718.027717.603714.73624.321624.584626.134627.748626.213622.758619.678617.18613.52615.16613.249661.589662.183660.933659.523NANANANANANANANANANANA
us-gaap:RetainedEarningsAccumulatedDeficit ▅▇██▇▆▆▅▅▄▃▃▃▂▂▁▁▂▂▂▂▂▂▁▁▇▇▇▆▇▆▆▆▆▆▅▅▅▄530.928561.38583.407577.018562.799555.205550.374541.469531.269522.384508.058502.265495.017480.309478.803469.459470.337492.316489.292487.048487.15484.774481.577476.484472.726564.58571.164562.758557.104565.594550.296556.502552.278547.352543.598538.882533.229529.63523.089NANANANANANANA
us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax ▅▄▂▄▄▃▂▁▁▁▃▄▄▄▄▅▅▅▅▅▅▅▅██▇▇▆▅▇▇▅▅▅▅██▇▇-24.44-28.907-36.941-27.697-29.219-35.035-39.696-44.689-43.093-42.221-32.08-25.607-25.148-26.821-27.991-19.643-19.517-20.958-24.535-20.06-22.583-21.223-24.37-6.663-5.216-8.095-11.9-19.041-19.587-9.975-11.488-19.626-21.106-21.218-23.226-6.255-6.689-10.518-13.497NANANANANANANA
us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue ▃▃▃▃▄▂▄▂▃▂▂▂▃▂▄█▃▂▄▂▂▂▃▃▃▂▃▃▃▂▃▂▃▂▃▂▅▂▂▁▁▂1.5311.4951.4271.6842.5351.22.4751.2722.2980.9781.1721.0941.710.9182.4146.5292.1391.2592.5951.0281.3990.882.2341.4611.7221.2391.6641.4411.5311.0821.4951.0881.421.0231.6491.0363.7820.8671.1940.0150.2250.803NANANANA
  2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:NetCashProvidedByUsedInOperatingActivities ▅▇▂▄▇▄▅▆▅▅▆▆▄▆█▇▁▃▃▅▃▄37.06350.30216.74329.75150.99629.97232.52139.64633.43433.30839.03444.35728.63244.03454.62647.52110.01324.74224.84135.91524.59827.848NANANANANANANANANANANANANA39.11431.34842.295NA-19.32524.7120.681NANANANA
us-gaap:NetCashProvidedByUsedInInvestingActivities ▁▄▄▃▃▃▃▃▃▃▄▄▃▃▄█▄▄▄▃▄▃-531.42136.02930.948-61.711-177.732-92.098-36.203-80.585-103.654-61.471-8.77730.698-39.884-90.336106.799901.86299.41141.33636.101-70.38111.359-65.891NANANANANANANANANANANANANA40.625-23.76449.881NA-101.582-177.669-243.75NANANANA
us-gaap:NetCashProvidedByUsedInFinancingActivities █▅▄▄▅▅▄▄▄▅▄▄▃▅▄▁▄▄▄▄▄▅1055.131129.277-94.44732.574140.80186.26-1.475-18.1611.107142.611-118.223-66.146-263.92988.383-92.124-940.24838.686-70.16510.841-162.857-40.1194.438NANANANANANANANANANANANANA-122.177-63.765-41.627NA-10.4124.62450.674NANANANA
us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect █▄▁▂▂▂▂▁▁▃560.773215.608-46.7560.61414.06524.134-5.157-59.099-59.113114.448NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:NetCashProvidedByUsedInOperatingActivities ▅▇▂▄▇▄▅▆▅▅▆▆▄▆█▇▁▃▃▅▃▄37.06350.30216.74329.75150.99629.97232.52139.64633.43433.30839.03444.35728.63244.03454.62647.52110.01324.74224.84135.91524.59827.848NANANANANANANANANANANANANA39.11431.34842.295NA-19.32524.7120.681NANANANA
us-gaap:ShareBasedCompensation ▃▃▃▃▄▂▄▂▃▂▂▂▃▂▂█▃▂▃▂▃▂▃▂▃▂▂▃▃▂▂▂▃▂▂▂▅▂▂▁▁▂1.5311.4951.4271.6832.5351.22.4751.2722.2980.9781.1721.0941.710.9181.2766.4481.9521.242.2940.9971.3990.881.4481.3021.7221.2391.0291.4411.5311.0821.0921.0881.421.0231.041.0363.7820.8671.1940.0150.2250.803NANANANA
  2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:NetCashProvidedByUsedInInvestingActivities ▁▄▄▃▃▃▃▃▃▃▄▄▃▃▄█▄▄▄▃▄▃-531.42136.02930.948-61.711-177.732-92.098-36.203-80.585-103.654-61.471-8.77730.698-39.884-90.336106.799901.86299.41141.33636.101-70.38111.359-65.891NANANANANANANANANANANANANA40.625-23.76449.881NA-101.582-177.669-243.75NANANANA
us-gaap:PaymentsToAcquirePropertyPlantAndEquipment █▇▃▅▆▇▃▃▂▁▅4.2623.5531.5972.7843.043.4781.7951.7771.1720.4892.477NANA2.2562.7424.255.9612.2745.5662.4853.0972.0752.6782.2561.4273.6076.7144.7584.6113.2846.4513.2434.2154.3467.9892.664-0.151.9314.2513.9925.6672.03NANANANA
  2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:NetCashProvidedByUsedInFinancingActivities █▅▄▄▅▅▄▄▄▅▄▄▃▅▄▁▄▄▄▄▄▅1055.131129.277-94.44732.574140.80186.26-1.475-18.1611.107142.611-118.223-66.146-263.92988.383-92.124-940.24838.686-70.16510.841-162.857-40.1194.438NANANANANANANANANANANANANA-122.177-63.765-41.627NA-10.4124.62450.674NANANANA
us-gaap:PaymentsOfDividends ▂▂▂▂▂▂▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁█▂▁▁24.25220.31719.20219.19519.13318.64317.56217.5417.41417.40516.35516.34316.27416.2415.1515.07514.97114.9613.94912.97412.92912.97312.07112.068104.56921.22411.95711.946NANA22.53111.46911.43511.42710.45911.06711.40410.71210.06811.07711.06811.063NANANANA
  2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
 us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:DebtInstrument,us-gaap:ShortTermDebtType nwbi:FixedRateAdvanceFour,us-gaap:NotesPayableToBanksNA0.0059NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:DebtInstrument,us-gaap:ShortTermDebtType nwbi:FixedRateAdvanceOne,us-gaap:NotesPayableToBanksNA0.0091NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:DebtInstrument,us-gaap:ShortTermDebtType nwbi:FixedRateAdvanceThree,us-gaap:NotesPayableToBanksNA0.007NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:DebtInstrument,us-gaap:ShortTermDebtType nwbi:FixedRateAdvanceTwo,us-gaap:NotesPayableToBanksNA0.007NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA

None

us-gaap:CommonStockValue

us-gaap:CommonStockValue


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-31
Value1278000.01069000.01069000.01067000.01066000.01062000.01034000.01033000.01031000.01026000.01027000.01026000.01025000.01020000.01017000.01013000.01025000.01018000.01019000.01017000.0947000.0946000.0947000.0950000.0949000.0945000.0943000.0942000.0939000.0938000.0937000.0978000.0979000.0976000.0975000.0976000.01033000.01078000.01103000.0
Percentage of CommonStockValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

None

us-gaap:SharesIssued us-gaap:StatementEquityComponents

us-gaap:SharesIssued

us-gaap:CommonStock


None
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
Value12710610610610610610310310310210210210210110110110210110110194949494949494949393939797979797103107110110110110110
Percentage of SharesIssued100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

None

us-gaap:CommonStockSharesIssued

us-gaap:CommonStockSharesIssued


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-31
Value12710610610610610610310310310210210210210110110110210110110194949494949494949393939797979797103107110
Percentage of CommonStockSharesIssued100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

None

us-gaap:CommonStockSharesOutstanding

us-gaap:CommonStockSharesOutstanding


None
Period End2020-06-302020-03-312019-12-312019-09-302018-12-312013-09-302013-06-302012-12-312012-09-302012-06-302011-12-31
Value127106106106103949393979797
Percentage of CommonStockSharesOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

None

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding


None
Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-30
Value1211061061061041031031031021021021011009995919192929291909094949497102107108108
Percentage of WeightedAverageNumberOfDilutedSharesOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

None

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic


None
Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-30
Value12110510510510310210110110110010099999895919191919190909094949496102106108108
Percentage of WeightedAverageNumberOfSharesOutstandingBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

None

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecurities

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount

nwbi:EmployeeAndDirectorsStockOptions


None
Period End2020-06-302016-03-312015-09-302015-06-302015-03-312014-09-30
Value4896000.0521790.0534480.01711100.03744900.0584710.0
Percentage of AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount100.0100.0100.0100.0100.0100.0

None

us-gaap:EarningsPerShareBasic

us-gaap:EarningsPerShareBasic


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value-0.050.080.240.320.250.240.260.270.260.250.220.230.310.180.240.14-0.070.180.160.140.170.180.190.190.140.160.220.190.150.170.180.170.170.160.160.170.150.160.120.140.150.120.010.110.070.11
Percentage of EarningsPerShareBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

None

us-gaap:EarningsPerShareDiluted

us-gaap:EarningsPerShareDiluted


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value-0.050.070.240.310.250.240.260.270.250.240.220.230.30.170.240.14-0.070.180.160.130.170.180.190.190.140.160.220.190.150.170.180.170.170.160.160.170.150.160.120.140.150.120.010.110.070.11
Percentage of EarningsPerShareDiluted100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

None

us-gaap:InterestAndFeeIncomeLoansAndLeases

us-gaap:InterestAndFeeIncomeLoansAndLeases


None
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
Value103949710110094929088858785848283828280807670707170706970717173767777787980798083838180
Percentage of InterestAndFeeIncomeLoansAndLeases100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating94.994.694.694.694.594.794.694.994.995.295.294.694.394.892.495.795.394.794.493.893.493.793.493.192.792.492.291.991.491.791.791.691.090.690.089.588.788.389.388.788.588.6

None

us-gaap:InsuranceCommissionsAndFees

us-gaap:InsuranceCommissionsAndFees


None
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
Value2.3952.3721.8581.8872.1452.1781.9062.0462.092.7491.8741.9922.3532.7942.4992.5412.7682.7142.492.3982.212.4282.1811.7782.2372.5642.1312.0192.192.2951.4631.481.6031.7181.5821.7961.791.381.3621.3931.2931.142
Percentage of InsuranceCommissionsAndFees100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating2.22.41.81.82.02.21.92.12.33.12.02.22.63.22.83.03.23.22.93.02.93.22.92.32.93.42.82.62.82.91.71.81.92.01.82.02.01.51.51.51.41.3

None

us-gaap:GeneralAndAdministrativeExpense

us-gaap:GeneralAndAdministrativeExpense


None
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
Value3.7113.3824.0973.1973.7083.1313.4553.5083.7683.4084.0113.9394.174.2224.3953.73.3433.464.5043.8923.5083.683.6773.4193.8683.7573.8233.4973.8663.2683.4193.1413.343.3243.2863.2093.2553.13.2334.462.9343.237
Percentage of GeneralAndAdministrativeExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating3.43.44.03.03.53.13.53.74.13.84.44.44.64.84.94.33.94.15.34.84.64.94.84.55.15.05.04.54.94.14.13.73.93.93.73.63.63.43.54.73.23.6

None

us-gaap:InterestExpense

us-gaap:InterestExpense


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value101314151412109.7888.6497.7667.3216.9947.0666.697.0917.454101314141313131414141415151517181920222323242527283132333434
Percentage of InterestExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating9.613.114.014.913.312.311.210.29.38.78.07.87.97.77.98.711.516.116.917.418.218.418.318.618.618.919.319.619.619.520.421.622.524.225.125.626.026.427.729.131.034.136.137.138.037.8

None

us-gaap:InterestIncomeExpenseNet

us-gaap:InterestIncomeExpenseNet


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value98878890928786858481848382808278767171666261626162606262636466656565666766676766636058565657
Percentage of InterestIncomeExpenseNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating90.486.986.085.186.787.788.889.890.791.392.092.292.192.392.191.388.583.983.182.681.881.681.781.481.481.180.780.480.480.579.678.477.575.874.974.474.073.672.370.969.065.963.962.962.062.2

None

us-gaap:AllocatedShareBasedCompensationExpense

us-gaap:AllocatedShareBasedCompensationExpense


None
Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-30
Value1500000.01500000.01700000.02500000.01200000.01300000.02300000.0978000.01100000.01700000.0918000.06400000.01900000.01200000.01000000.01400000.0898000.01300000.01800000.01200000.01200000.01500000.01100000.01100000.0
Percentage of AllocatedShareBasedCompensationExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating1.41.51.62.31.21.42.51.11.21.91.17.42.21.41.21.81.21.72.41.61.51.91.41.3

None

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value-7.3398.9563243333134343331283645253618-10.49926241822222323171929231821222223212123212417212318-3.398169.64717
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating-6.88.931.340.431.631.734.836.435.735.731.439.950.529.640.921.9-12.130.629.022.329.630.530.930.622.526.538.330.023.527.126.726.428.124.924.426.123.427.219.122.925.120.3-3.717.710.618.9

None

us-gaap:IncomeTaxExpenseBenefit

us-gaap:IncomeTaxExpenseBenefit


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value-1.1391.0176.7739.7937.4046.7097.5477.0356.96.946.57612148.052124.697-3.4918.0818.6845.2387.2136.8256.195.9264.4655.2669.0895.7525.0516.4396.046.5187.5086.3026.4636.8226.0817.4915.0436.0687.0785.333-4.4043.9562.3565.092
Percentage of IncomeTaxExpenseBenefit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating-1.01.06.59.26.96.77.77.47.47.87.213.816.09.213.75.5-4.09.510.16.59.59.08.17.85.87.011.87.46.48.07.27.78.87.37.37.66.78.25.46.57.75.9-4.84.42.65.5

None

us-gaap:ComprehensiveIncomeNetOfTax

us-gaap:ComprehensiveIncomeNetOfTax


None
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
Value-1.733151634322931262521152332181614-5.5672111151319-0.36215151827183.8661624171617-1.7961718206.624151813
Percentage of ComprehensiveIncomeNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating-1.615.915.832.730.129.632.227.327.424.117.125.636.421.717.916.3-6.425.313.719.018.425.6-0.520.920.424.635.823.34.921.029.220.419.419.9-2.019.120.922.27.116.320.214.7

us-gaap:ComprehensiveIncomeNetOfTax us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome


None
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
Value4.4678.034-9.2441.5225.8164.6614.993-1.596-0.872-10.141-6.473-0.4591.6731.17-8.348-0.1261.4413.577-4.4752.523-1.363.147-17.707-1.4472.8793.8057.1410.546-9.6121.5138.1381.480.1122.008-16.9710.4343.8292.979-6.114-0.1582.5060.246
Percentage of ComprehensiveIncomeNetOfTax-257.850.3-56.54.418.115.715.9-6.1-3.4-47.0-41.3-2.05.16.2-51.7-0.9-25.916.6-38.216.4-9.816.34891.4-9.118.520.626.03.0-248.69.033.38.60.711.7944.92.520.314.7-92.3-1.013.41.8
Percentage of InterestAndDividendIncomeOperating4.18.0-8.91.45.44.65.1-1.7-0.9-11.3-7.1-0.51.91.3-9.3-0.11.74.2-5.23.1-1.84.2-23.2-1.93.85.19.30.7-12.21.99.71.80.12.3-19.10.54.23.3-6.6-0.22.70.3
Percentage of InterestAndDividendIncomeOperating us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RetainedEarnings


None
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
Value-6.27.9392533262526272631222330172414-7.00817161215161717121420171315161516151516151712151613
Percentage of ComprehensiveIncomeNetOfTax357.849.7156.595.681.984.384.1106.1103.4147.0141.3102.094.993.8151.7100.9125.983.4138.283.6109.883.7-4791.4109.181.579.474.097.0348.691.066.791.499.388.3-844.997.579.785.3192.3101.086.698.2
Percentage of InterestAndDividendIncomeOperating-5.77.924.731.324.725.027.129.028.335.424.226.134.520.327.216.5-8.121.118.915.920.121.422.822.816.719.526.522.617.119.119.518.619.217.617.118.616.618.913.716.517.514.4
Percentage of InterestAndDividendIncomeOperating us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

None

us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic

us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value-6.27.9392533262526272624222330172414-7.008171612151617171214201713151615161515161517121516131.006127.29112
Percentage of NetIncomeLossAvailableToCommonStockholdersBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating-5.77.924.731.324.725.027.129.028.327.924.226.134.520.327.216.5-8.121.118.915.920.121.422.822.816.719.526.522.617.119.119.518.619.217.617.118.616.618.913.716.517.514.41.113.38.013.3

us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value-6.27.9392533262526272624222330172414-7.008171612151617171214201713151615161515161517
Percentage of NetIncomeLossAvailableToCommonStockholdersBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating-5.77.924.731.324.725.027.129.028.327.924.226.134.520.327.216.5-8.121.118.915.920.121.422.822.816.719.526.522.617.119.119.518.619.217.617.118.616.618.9
Percentage of InterestAndDividendIncomeOperating us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

None

us-gaap:Assets

us-gaap:Assets


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-31
Value138451068110493105801050510297960795759562952093639459949997319623971489638916895189347864789077757826790279747881790879637994794280478037806979577989808781228148814281368025
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:Assets us-gaap:SubsequentEventType

us-gaap:SubsequentEvent


None
Period End2020-04-24
Value12800
Percentage of Assets0.0
Percentage of Assets0.0
Percentage of Assets us-gaap:SubsequentEvent100.0

None

us-gaap:Liabilities

us-gaap:Liabilities


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-31
Value1231493399140922891718980835083348333830581568253830285538452855178087745778877736796682267126750682968176724676968356846681468736868690668026822686068356840
Percentage of Liabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets88.987.487.187.287.387.286.987.087.187.287.187.387.487.987.888.087.186.987.087.086.486.586.386.286.485.585.385.685.885.685.885.485.585.685.585.484.884.284.0

None

us-gaap:LiabilitiesAndStockholdersEquity

us-gaap:LiabilitiesAndStockholdersEquity


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-31
Value138451068110493105801050510297960795759562952093639459949997319623971489638916895189347864789077757826790279747881790879637994794280478037806979577989808781228148
Percentage of LiabilitiesAndStockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

None

us-gaap:StockholdersEquity

us-gaap:StockholdersEquity


None
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
Value1530134113531351133313161257124012281215120712051196117711701162115511701163116110681067106210761072115711561138112811471128117411691162115411661227128713071315131013021316613
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets11.112.612.912.812.712.813.113.012.912.812.912.712.612.112.212.012.913.113.013.013.613.513.713.813.614.514.714.414.214.414.214.614.514.414.514.615.215.816.016.216.10.016.40.0

us-gaap:StockholdersEquity us-gaap:StatementEquityComponents

us-gaap:AccumulatedDefinedBenefitPlansAdjustment


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312013-12-31
Value-39.59-39.839-40.088-32.238-32.446-32.655-32.864-31.908-32.134-32.36-26.98-25.946-26.167-26.388-26.608-24.406-24.63-24.856-25.081-23.096-23.315-23.534-23.753-3.443
Percentage of StockholdersEquity-2.6-3.0-3.0-2.4-2.4-2.5-2.6-2.6-2.6-2.7-2.2-2.2-2.2-2.2-2.3-2.1-2.1-2.1-2.2-2.0-2.2-2.2-2.2-0.3
Percentage of Assets-0.3-0.4-0.4-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.0
Percentage of Assets us-gaap:AccumulatedDefinedBenefitPlansAdjustment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedGainLossNetCashFlowHedgeParent


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value-0.946-0.4090.00.00.00.00.0
Percentage of StockholdersEquity-0.1-0.00.00.00.00.00.0
Percentage of Assets-0.0-0.00.00.00.00.00.0
Percentage of Assets us-gaap:AccumulatedGainLossNetCashFlowHedgeParent0.00.00.00.00.00.00.0

us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312013-12-31
Value16113.1474.5413.227-2.38-6.832-12.707-10.693-9.381-4.4091.3382.2761.0420.3957.0457.8666.8173.3256.5374.2786.3453.461-3.233
Percentage of StockholdersEquity1.10.80.20.30.2-0.2-0.5-1.0-0.9-0.8-0.40.10.20.10.00.60.70.60.30.60.40.60.3-0.3
Percentage of Assets0.10.10.00.00.0-0.0-0.1-0.1-0.1-0.1-0.00.00.00.00.00.10.10.10.00.10.10.10.0-0.0
Percentage of Assets us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedOtherComprehensiveIncome


None
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
Value-24.44-28.907-36.941-27.697-29.219-35.035-39.696-44.689-43.093-42.221-32.08-25.607-25.148-26.821-27.991-19.643-19.517-20.958-24.535-20.06-22.583-21.223-24.37-6.663-5.216-8.095-11.9-19.041-19.587-9.975-11.488-19.626-21.106-21.218-23.226-6.255-6.689-10.518-13.497-7.383-7.225-9.731-9.977-30.575
Percentage of StockholdersEquity-1.6-2.2-2.7-2.0-2.2-2.7-3.2-3.6-3.5-3.5-2.7-2.1-2.1-2.3-2.4-1.7-1.7-1.8-2.1-1.7-2.1-2.0-2.3-0.6-0.5-0.7-1.0-1.7-1.7-0.9-1.0-1.7-1.8-1.8-2.0-0.5-0.5-0.8-1.0-0.6-0.6-0.7-0.8-5.0
Percentage of Assets-0.2-0.3-0.4-0.3-0.3-0.3-0.4-0.5-0.5-0.4-0.3-0.3-0.3-0.3-0.3-0.2-0.2-0.2-0.3-0.2-0.3-0.3-0.3-0.1-0.1-0.1-0.2-0.2-0.2-0.1-0.1-0.2-0.3-0.3-0.3-0.1-0.1-0.1-0.2-0.1-0.10.0-0.10.0
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:AdditionalPaidInCapital


None
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
Value1023808805801798795745742739734730728726723718711722718717714624624626627626622619617613615613661662660659659726793824829829828828218
Percentage of StockholdersEquity66.860.259.559.359.960.459.359.960.260.460.560.460.761.461.461.262.661.361.761.558.458.558.958.358.453.853.654.254.453.654.356.356.656.957.156.559.261.763.063.163.363.662.935.6
Percentage of Assets7.47.67.77.67.67.77.87.87.77.77.87.77.67.47.57.38.18.18.08.07.97.98.18.07.97.87.97.87.77.77.78.28.28.28.38.39.09.810.110.210.20.010.30.0
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CommonStock


None
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
Value1.2781.0691.0691.0671.0661.0621.0341.0331.0311.0261.0271.0261.0251.021.0171.0131.0251.0181.0191.0170.9470.9460.9470.950.9490.9450.9430.9420.9390.9380.9370.9780.9790.9760.9750.9761.0331.0781.1031.1081.1081.1071.1065.124
Percentage of StockholdersEquity0.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.8
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
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:RetainedEarnings


None
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
Value530561583577562555550541531522508502495480478469470492489487487484481476472564571562557565550556552547543538533529523520516510508490
Percentage of StockholdersEquity34.741.843.142.742.242.243.843.643.243.042.141.741.440.840.940.440.742.142.141.945.645.445.344.344.148.849.449.449.449.348.847.447.247.147.146.243.541.140.039.639.439.238.779.9
Percentage of Assets3.85.35.65.55.45.45.75.75.65.55.45.35.24.95.04.85.25.55.55.56.26.16.26.16.07.17.27.17.07.16.96.96.96.86.86.76.66.56.46.46.30.06.30.0
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

None

us-gaap:AmortizationOfIntangibleAssets

us-gaap:AmortizationOfIntangibleAssets


None
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
Value1760000.01651000.01634000.01702000.01760000.01447000.01346000.01462000.01520000.01520000.01575000.01691000.01749000.01749000.01806000.01068000.0710000.0675000.0729000.0422000.0269000.0268000.0331000.0330000.0331000.0331000.0222000.0291000.0349000.0348000.0219000.0219000.0279000.0295000.0374000.0475000.0479000.0491000.0518000.0725000.0759000.0782000.0
Percentage of AmortizationOfIntangibleAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

None

us-gaap:PropertyPlantAndEquipmentNet

us-gaap:PropertyPlantAndEquipmentNet


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-31
Value166147147148148149143144146148151152154159161167151153154153142142143144145146146142140138138135135133132126126126128
Percentage of PropertyPlantAndEquipmentNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.21.41.41.41.41.51.51.51.51.61.61.61.61.61.71.71.71.71.71.71.81.81.91.81.81.81.91.81.81.71.71.71.71.71.71.61.61.61.6

None

us-gaap:Goodwill

us-gaap:Goodwill


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-08-142015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value38634634634434434430730730730730730730730730730726226126126185175175175176175175174174174174174171171171171171171171171171
Percentage of Goodwill100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets2.83.23.33.33.33.33.23.23.23.23.33.23.23.23.23.22.92.92.92.90.02.22.22.32.32.22.22.22.22.22.22.22.12.12.12.22.22.12.12.12.1

us-gaap:Goodwill us-gaap:BusinessAcquisition

nwbi:MutualFirstFinancialInc.


None
Period End2020-04-24
Value39
Percentage of Goodwill0.0
Percentage of Assets0.0
Percentage of Assets nwbi:MutualFirstFinancialInc.0.0

None

us-gaap:IntangibleAssetsNetExcludingGoodwill

us-gaap:IntangibleAssetsNetExcludingGoodwill


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-31
Value232123222425192122242527283032338.0958.3988.9829.7122.7593.0273.0333.3643.6944.0252.3192.5412.8323.1813.5291.331.5491.8282.1232.4972.9723.4513.942
Percentage of IntangibleAssetsNetExcludingGoodwill100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.20.20.20.20.20.30.20.20.20.30.30.30.30.30.30.30.10.10.10.10.00.00.00.00.00.10.00.00.00.00.00.00.00.00.00.00.00.00.0

None

us-gaap:FiniteLivedIntangibleAssetsNet

us-gaap:FiniteLivedIntangibleAssetsNet


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value232123222419
Percentage of FiniteLivedIntangibleAssetsNet100.0100.0100.0100.0100.0100.0
Percentage of Assets0.20.20.20.20.20.2

us-gaap:FiniteLivedIntangibleAssetsNet us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:CoreDeposits


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value211820212324181921222324262729305.8396.36.7617.2220.00.0220.0430.0650.0870.1380.190.2940.3970.5220.6460.831.0291.2611.5932.277
Percentage of FiniteLivedIntangibleAssetsNet89.987.987.796.896.40.094.10.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets0.20.20.20.20.20.20.20.20.20.20.30.30.30.30.30.30.10.10.10.10.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:CoreDeposits0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CustomerContracts


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value2.3732.5992.8270.7140.8631.0131.1631.3681.5811.7972.0132.2842.5622.8443.1263.1262.2562.0982.2212.492.7593.0273.0333.3423.6513.962.2322.4032.6422.8873.1320.8080.9030.9981.0941.2361.3791.665
Percentage of FiniteLivedIntangibleAssetsNet10.112.112.33.23.60.05.90.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:CustomerContracts0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

None

us-gaap:DebtAndCapitalLeaseObligations us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:DebtAndCapitalLeaseObligations

us-gaap:FairValueInputsLevel1


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302014-12-31
Value44219424625517111423417999104108115110137142135139142118132138162
Percentage of DebtAndCapitalLeaseObligations100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets3.21.82.32.41.61.12.41.91.01.11.21.21.21.41.51.41.61.61.31.51.82.1
Percentage of Assets us-gaap:FairValueInputsLevel10.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:FairValueInputsLevel3


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302014-12-31
Value0.00.00.00.00.00.00.00.00.00.00.00.00.2010.00.00.0820734879825786756
Percentage of DebtAndCapitalLeaseObligations0.00.00.00.00.00.00.00.00.00.00.00.00.20.00.00.0587.3515.9741.5621.0567.2465.2
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.09.18.29.89.210.09.7
Percentage of Assets us-gaap:FairValueInputsLevel30.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:DebtAndCapitalLeaseObligations us-gaap:FairValueByMeasurementBasis

us-gaap:CarryingReportedAmountFairValueDisclosure


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302014-12-31
Value44019124625517111423417999104108115110137142135959857975927899888
Percentage of DebtAndCapitalLeaseObligations99.598.6100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.2100.0100.0100.0687.4602.3821.7697.9648.3545.8
Percentage of Assets3.21.82.32.41.61.12.41.91.01.11.21.21.21.41.51.410.79.610.910.411.411.4
Percentage of Assets us-gaap:CarryingReportedAmountFairValueDisclosure0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:EstimateOfFairValueFairValueDisclosure


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302014-12-31
Value44219424625517111423417999104108115110137142135959877998957925919
Percentage of DebtAndCapitalLeaseObligations100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.2100.0100.0100.0687.3615.9841.5721.0667.2565.2
Percentage of Assets3.21.82.32.41.61.12.41.91.01.11.21.21.21.41.51.410.79.811.210.711.811.8
Percentage of Assets us-gaap:EstimateOfFairValueFairValueDisclosure0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

None

us-gaap:StockholdersEquity

us-gaap:StockholdersEquity


None
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
Value1530134113531351133313161257124012281215120712051196117711701162115511701163116110681067106210761072115711561138112811471128117411691162115411661227128713071315131013021316613
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets11.112.612.912.812.712.813.113.012.912.812.912.712.612.112.212.012.913.113.013.013.613.513.713.813.614.514.714.414.214.414.214.614.514.414.514.615.215.816.016.216.10.016.40.0

us-gaap:StockholdersEquity us-gaap:StatementEquityComponents

us-gaap:AccumulatedDefinedBenefitPlansAdjustment


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312013-12-31
Value-39.59-39.839-40.088-32.238-32.446-32.655-32.864-31.908-32.134-32.36-26.98-25.946-26.167-26.388-26.608-24.406-24.63-24.856-25.081-23.096-23.315-23.534-23.753-3.443
Percentage of StockholdersEquity-2.6-3.0-3.0-2.4-2.4-2.5-2.6-2.6-2.6-2.7-2.2-2.2-2.2-2.2-2.3-2.1-2.1-2.1-2.2-2.0-2.2-2.2-2.2-0.3
Percentage of Assets-0.3-0.4-0.4-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.0
Percentage of Assets us-gaap:AccumulatedDefinedBenefitPlansAdjustment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedGainLossNetCashFlowHedgeParent


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value-0.946-0.4090.00.00.00.00.0
Percentage of StockholdersEquity-0.1-0.00.00.00.00.00.0
Percentage of Assets-0.0-0.00.00.00.00.00.0
Percentage of Assets us-gaap:AccumulatedGainLossNetCashFlowHedgeParent0.00.00.00.00.00.00.0

us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312013-12-31
Value16113.1474.5413.227-2.38-6.832-12.707-10.693-9.381-4.4091.3382.2761.0420.3957.0457.8666.8173.3256.5374.2786.3453.461-3.233
Percentage of StockholdersEquity1.10.80.20.30.2-0.2-0.5-1.0-0.9-0.8-0.40.10.20.10.00.60.70.60.30.60.40.60.3-0.3
Percentage of Assets0.10.10.00.00.0-0.0-0.1-0.1-0.1-0.1-0.00.00.00.00.00.10.10.10.00.10.10.10.0-0.0
Percentage of Assets us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedOtherComprehensiveIncome


None
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
Value-24.44-28.907-36.941-27.697-29.219-35.035-39.696-44.689-43.093-42.221-32.08-25.607-25.148-26.821-27.991-19.643-19.517-20.958-24.535-20.06-22.583-21.223-24.37-6.663-5.216-8.095-11.9-19.041-19.587-9.975-11.488-19.626-21.106-21.218-23.226-6.255-6.689-10.518-13.497-7.383-7.225-9.731-9.977-30.575
Percentage of StockholdersEquity-1.6-2.2-2.7-2.0-2.2-2.7-3.2-3.6-3.5-3.5-2.7-2.1-2.1-2.3-2.4-1.7-1.7-1.8-2.1-1.7-2.1-2.0-2.3-0.6-0.5-0.7-1.0-1.7-1.7-0.9-1.0-1.7-1.8-1.8-2.0-0.5-0.5-0.8-1.0-0.6-0.6-0.7-0.8-5.0
Percentage of Assets-0.2-0.3-0.4-0.3-0.3-0.3-0.4-0.5-0.5-0.4-0.3-0.3-0.3-0.3-0.3-0.2-0.2-0.2-0.3-0.2-0.3-0.3-0.3-0.1-0.1-0.1-0.2-0.2-0.2-0.1-0.1-0.2-0.3-0.3-0.3-0.1-0.1-0.1-0.2-0.1-0.10.0-0.10.0
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:AdditionalPaidInCapital


None
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
Value1023808805801798795745742739734730728726723718711722718717714624624626627626622619617613615613661662660659659726793824829829828828218
Percentage of StockholdersEquity66.860.259.559.359.960.459.359.960.260.460.560.460.761.461.461.262.661.361.761.558.458.558.958.358.453.853.654.254.453.654.356.356.656.957.156.559.261.763.063.163.363.662.935.6
Percentage of Assets7.47.67.77.67.67.77.87.87.77.77.87.77.67.47.57.38.18.18.08.07.97.98.18.07.97.87.97.87.77.77.78.28.28.28.38.39.09.810.110.210.20.010.30.0
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CommonStock


None
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
Value1.2781.0691.0691.0671.0661.0621.0341.0331.0311.0261.0271.0261.0251.021.0171.0131.0251.0181.0191.0170.9470.9460.9470.950.9490.9450.9430.9420.9390.9380.9370.9780.9790.9760.9750.9761.0331.0781.1031.1081.1081.1071.1065.124
Percentage of StockholdersEquity0.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.8
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
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:RetainedEarnings


None
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
Value530561583577562555550541531522508502495480478469470492489487487484481476472564571562557565550556552547543538533529523520516510508490
Percentage of StockholdersEquity34.741.843.142.742.242.243.843.643.243.042.141.741.440.840.940.440.742.142.141.945.645.445.344.344.148.849.449.449.449.348.847.447.247.147.146.243.541.140.039.639.439.238.779.9
Percentage of Assets3.85.35.65.55.45.45.75.75.65.55.45.35.24.95.04.85.25.55.55.56.26.16.26.16.07.17.27.17.07.16.96.96.96.86.86.76.66.56.46.46.30.06.30.0
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

None

us-gaap:CommonStockValue

us-gaap:CommonStockValue


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-31
Value1278000.01069000.01069000.01067000.01066000.01062000.01034000.01033000.01031000.01026000.01027000.01026000.01025000.01020000.01017000.01013000.01025000.01018000.01019000.01017000.0947000.0946000.0947000.0950000.0949000.0945000.0943000.0942000.0939000.0938000.0937000.0978000.0979000.0976000.0975000.0976000.01033000.01078000.01103000.0
Percentage of CommonStockValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

None

us-gaap:AdditionalPaidInCapitalCommonStock

us-gaap:AdditionalPaidInCapitalCommonStock


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-31
Value1023808805801798795745742739734730728726723718711722718717714624624626627626622619617613615613661662660659
Percentage of AdditionalPaidInCapitalCommonStock100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets7.47.67.77.67.67.77.87.87.77.77.87.77.67.47.57.38.18.18.08.07.97.98.18.07.97.87.97.87.77.77.78.28.28.28.3

None

us-gaap:RetainedEarningsAccumulatedDeficit

us-gaap:RetainedEarningsAccumulatedDeficit


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-31
Value530561583577562555550541531522508502495480478469470492489487487484481476472564571562557565550556552547543538533529523
Percentage of RetainedEarningsAccumulatedDeficit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets3.85.35.65.55.45.45.75.75.65.55.45.35.24.95.04.85.25.55.55.56.26.16.26.16.07.17.27.17.07.16.96.96.96.86.86.76.66.56.4

None

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-31
Value-24.44-28.907-36.941-27.697-29.219-35.035-39.696-44.689-43.093-42.221-32.08-25.607-25.148-26.821-27.991-19.643-19.517-20.958-24.535-20.06-22.583-21.223-24.37-6.663-5.216-8.095-11.9-19.041-19.587-9.975-11.488-19.626-21.106-21.218-23.226-6.255-6.689-10.518-13.497
Percentage of AccumulatedOtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets-0.2-0.3-0.4-0.3-0.3-0.3-0.4-0.5-0.5-0.4-0.3-0.3-0.3-0.3-0.3-0.2-0.2-0.2-0.3-0.2-0.3-0.3-0.3-0.1-0.1-0.1-0.2-0.2-0.2-0.1-0.1-0.2-0.3-0.3-0.3-0.1-0.1-0.1-0.2

None

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue


None
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
Value1.5311.4951.4271.6842.5351.22.4751.2722.2980.9781.1721.0941.710.9182.4146.5292.1391.2592.5951.0281.3990.882.2341.4611.7221.2391.6641.4411.5311.0821.4951.0881.421.0231.6491.0363.7820.8671.1940.0150.2250.803
Percentage of AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital


None
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
Value1.5281.4951.4271.6842.5321.22.4751.2722.2940.9781.1721.0941.7060.9182.4141.0691.6910.8581.4130.9411.3160.8042.0771.0591.2880.7881.4421.0031.1340.6941.2030.7131.0410.6251.3570.6543.3840.483-0.2480.0150.2250.803
Percentage of AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue99.8100.0100.0100.099.9100.0100.0100.099.8100.0100.0100.099.8100.0100.016.479.168.154.591.594.191.493.072.574.863.686.769.674.164.180.565.573.361.182.363.189.555.7-20.8100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CommonStock


None
Period End2020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302014-12-312014-09-302014-06-302013-12-312013-09-302013-06-302012-12-312012-09-302012-06-302011-12-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value0.0030.00.00.0030.00.00.0040.00.00.0040.00.00.00.0030.00.00.00.0030.00.00.0020.00.00.0030.00.00.0030.00.0010.0120.00.00.00.0
Percentage of AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue0.20.00.00.10.00.00.20.00.00.20.00.00.00.10.00.00.00.20.00.00.10.00.00.20.00.00.20.00.10.30.00.00.00.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:CommonStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

None

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInOperatingActivities


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value37501629502932393333394428445447102424352427393142-19.3252420
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating34.150.116.227.847.729.933.341.536.037.242.649.231.950.560.755.211.529.029.044.332.436.943.434.846.4-20.626.722.7

None

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value-531.4213630-61.711-177.732-92.098-36.203-80.585-103.654-61.471-8.77730-39.884-90.336106901994136-70.38111-65.89140-23.76449-101.582-177.669-243.75
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating-489.635.929.9-57.7-166.4-91.8-37.0-84.3-111.6-68.7-9.634.0-44.4-103.5118.61047.5114.748.542.2-86.815.0-87.345.1-26.454.8-108.1-192.3-267.5

None

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value1055129-94.4473214086-1.475-18.1611142-118.223-66.146-263.92988-92.124-940.24838-70.16510-162.857-40.1194-122.177-63.765-41.627-10.412450
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating972.0128.8-91.330.5131.886.0-1.5-19.012.0159.3-129.1-73.3-293.9101.3-102.3-1092.044.6-82.312.7-200.8-52.8125.1-135.7-70.7-45.7-11.126.655.6

None

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value560215-46.7560.6141424-5.157-59.099-59.113114
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating516.6214.8-45.20.613.224.1-5.3-61.8-63.6127.8

None

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInOperatingActivities


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value37501629502932393333394428445447102424352427393142-19.3252420
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating34.150.116.227.847.729.933.341.536.037.242.649.231.950.560.755.211.529.029.044.332.436.943.434.846.4-20.626.722.7

None

us-gaap:ShareBasedCompensation

us-gaap:ShareBasedCompensation


None
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
Value1.5311.4951.4271.6832.5351.22.4751.2722.2980.9781.1721.0941.710.9181.2766.4481.9521.242.2940.9971.3990.881.4481.3021.7221.2391.0291.4411.5311.0821.0921.0881.421.0231.041.0363.7820.8671.1940.0150.2250.803
Percentage of ShareBasedCompensation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

None

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value-531.4213630-61.711-177.732-92.098-36.203-80.585-103.654-61.471-8.77730-39.884-90.336106901994136-70.38111-65.89140-23.76449-101.582-177.669-243.75
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating-489.635.929.9-57.7-166.4-91.8-37.0-84.3-111.6-68.7-9.634.0-44.4-103.5118.61047.5114.748.542.2-86.815.0-87.345.1-26.454.8-108.1-192.3-267.5

None

us-gaap:PaymentsToAcquirePropertyPlantAndEquipment

us-gaap:PaymentsToAcquirePropertyPlantAndEquipment


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value4.2623.5531.5972.7843.043.4781.7951.7771.1720.4892.4772.2562.7424.255.9612.2745.5662.4853.0972.0752.6782.2561.4273.6076.7144.7584.6113.2846.4513.2434.2154.3467.9892.664-0.151.9314.2513.9925.6672.03
Percentage of PaymentsToAcquirePropertyPlantAndEquipment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

None

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value1055129-94.4473214086-1.475-18.1611142-118.223-66.146-263.92988-92.124-940.24838-70.16510-162.857-40.1194-122.177-63.765-41.627-10.412450
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating972.0128.8-91.330.5131.886.0-1.5-19.012.0159.3-129.1-73.3-293.9101.3-102.3-1092.044.6-82.312.7-200.8-52.8125.1-135.7-70.7-45.7-11.126.655.6

None

us-gaap:PaymentsOfDividends

us-gaap:PaymentsOfDividends


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value242019191918171717171616161615151414131212121212104211111221111111011111010111111
Percentage of PaymentsOfDividends100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

None

us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:DebtInstrument, us-gaap:ShortTermDebtType

us-gaap:DebtInstrumentInterestRateStatedPercentage

nwbi:FixedRateAdvanceFour, us-gaap:NotesPayableToBanks


None
Period End2020-03-31
Value0.0059
Percentage of DebtInstrumentInterestRateStatedPercentage100.0
Percentage of LongTermDebtAndCapitalLeaseObligations0.0
Percentage of LongTermDebtAndCapitalLeaseObligations nwbi:FixedRateAdvanceFour us-gaap:NotesPayableToBanks0.0

nwbi:FixedRateAdvanceOne, us-gaap:NotesPayableToBanks


None
Period End2020-03-31
Value0.0091
Percentage of DebtInstrumentInterestRateStatedPercentage154.2
Percentage of LongTermDebtAndCapitalLeaseObligations0.0
Percentage of LongTermDebtAndCapitalLeaseObligations nwbi:FixedRateAdvanceOne us-gaap:NotesPayableToBanks0.0

nwbi:FixedRateAdvanceThree, us-gaap:NotesPayableToBanks


None
Period End2020-03-31
Value0.007
Percentage of DebtInstrumentInterestRateStatedPercentage118.6
Percentage of LongTermDebtAndCapitalLeaseObligations0.0
Percentage of LongTermDebtAndCapitalLeaseObligations nwbi:FixedRateAdvanceThree us-gaap:NotesPayableToBanks0.0

nwbi:FixedRateAdvanceTwo, us-gaap:NotesPayableToBanks


None
Period End2020-03-31
Value0.007
Percentage of DebtInstrumentInterestRateStatedPercentage118.6
Percentage of LongTermDebtAndCapitalLeaseObligations0.0
Percentage of LongTermDebtAndCapitalLeaseObligations nwbi:FixedRateAdvanceTwo us-gaap:NotesPayableToBanks0.0

None

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod us-gaap:TitleOfIndividual, us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod

nwbi:Employees, us-gaap:RestrictedStock


None
Period End2020-05-202019-05-222018-05-142011-04-20
Value261090.0256800.0390030.0353750.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod100.0100.0100.0100.0

srt:Director, us-gaap:RestrictedStock


None
Period End2020-05-202019-05-222018-05-142011-04-20
Value21600.024300.024300.024300.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod8.39.56.26.9

None

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-31
Value8372766010710692687313319277389
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

nwbi:AverageSharePriceDuringTheReportingPeriod us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecurities

nwbi:AverageSharePriceDuringTheReportingPeriod

nwbi:EmployeeAndDirectorsStockOptions


None
Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value10.314.6216.6917.1617.7418.0117.0716.8316.2615.9717.5415.1914.1512.7112.7612.3211.89-0.2612.6313.7214.470.3313.7712.4512.45
Percentage of AverageSharePriceDuringTheReportingPeriod100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

nwbi:CashPaidForInterestOnDeposits

nwbi:CashPaidForInterestOnDeposits


None
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
Value9.1329.9071211119.3648.4037.8126.9446.1715.7415.6165.6165.4125.6575.2215.6515.6845.8575.5845.2525.2565.5075.6685.7895.8196.2036.4196.6767.0318.0278.879.671111212131314151618
Percentage of CashPaidForInterestOnDeposits100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

nwbi:CashPaidForInterestOnDepositsAndBorrowings

nwbi:CashPaidForInterestOnDepositsAndBorrowings


None
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
Value9.9151314131411109.7298.6097.6987.3797.0067.1226.7477.137.5091113141313131314141414151515171818202223232425292831
Percentage of CashPaidForInterestOnDepositsAndBorrowings100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

nwbi:FederalDepositInsuranceCorporationPremiumExpenseNet

nwbi:FederalDepositInsuranceCorporationPremiumExpenseNet


None
Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-09-30
Value1618000.00-702000.0681000.0706000.0721000.0
Percentage of FederalDepositInsuranceCorporationPremiumExpenseNet100.00.0100.0100.0100.0100.0

nwbi:FeesAndCommissionsTrustServicesAndOtherIncome

nwbi:FeesAndCommissionsTrustServicesAndOtherIncome


None
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
Value4.8235.0014.5174.609-4.444-4.195-4.246-4.254-4.05-4.031-4.29-4.793-4.6
Percentage of FeesAndCommissionsTrustServicesAndOtherIncome100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

nwbi:FinancingReceivableModificationAllowanceForCreditLosses

nwbi:FinancingReceivableModificationAllowanceForCreditLosses


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302011-12-312011-09-302011-06-30
Value70000.01804000.069000.0563000.033000.0167000.0129000.086000.057000.072000.0154000.070000.0287000.0125000.077000.0576000.0866000.0216000.0983000.030000.018000.0357000.01295000.091000.0161000.0-884000.0280000.052000.0600000.04451000.01847000.0641000.0216000.01351000.0245000.0
Percentage of FinancingReceivableModificationAllowanceForCreditLosses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

nwbi:FinancingReceivableModificationAllowanceForCreditLosses us-gaap:FinancingReceivablePortfolioSegment

nwbi:BusinessBanking


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value58000.01804000.048000.0553000.033000.0120000.047000.043000.0032000.084000.025000.0239000.066000.075000.0512000.0807000.0191000.0983000.030000.00
Percentage of FinancingReceivableModificationAllowanceForCreditLosses82.9100.069.698.2100.071.936.450.00.044.454.535.783.352.897.488.993.288.4100.0100.00.0

nwbi:PersonalBanking


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value12000.0021000.010000.0047000.082000.043000.057000.040000.070000.045000.048000.059000.02000.064000.059000.025000.00018000.0
Percentage of FinancingReceivableModificationAllowanceForCreditLosses17.10.030.41.80.028.163.650.0100.055.645.564.316.747.22.611.16.811.60.00.0100.0

nwbi:FinancingReceivableModificationAllowanceForCreditLosses us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable

nwbi:BusinessBanking, nwbi:CommercialRealEstateOwnerOccupied


None
Period End2020-06-302020-03-312019-06-30
Value0176000.00
Percentage of FinancingReceivableModificationAllowanceForCreditLosses0.09.80.0

nwbi:BusinessBanking, us-gaap:CommercialLoan


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value01628000.016000.04000.01000.048000.05000.010000.00-47000.071000.0014000.0-124000.064000.0481000.0538000.0125000.03000.029000.00
Percentage of FinancingReceivableModificationAllowanceForCreditLosses0.090.223.20.73.028.73.911.60.0-65.346.10.04.9-99.283.183.562.157.90.396.70.0

nwbi:BusinessBanking, us-gaap:CommercialRealEstate


None
Period End2020-06-302020-03-312019-09-302019-06-302018-09-302018-06-302018-03-312017-09-302017-06-30
Value58000.00549000.032000.042000.033000.0013000.025000.0
Percentage of FinancingReceivableModificationAllowanceForCreditLosses82.90.097.597.032.638.40.08.435.7

nwbi:PersonalBanking, us-gaap:HomeEquityLoan


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value12000.0010000.02000.0037000.047000.037000.036000.010000.030000.00050000.01000.047000.013000.04000.00017000.0
Percentage of FinancingReceivableModificationAllowanceForCreditLosses17.10.014.50.40.022.236.443.063.213.919.50.00.040.01.38.21.51.90.00.094.4

nwbi:PersonalBanking, us-gaap:ResidentialMortgage


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value0011000.08000.0010000.035000.06000.021000.030000.040000.045000.048000.09000.01000.017000.046000.021000.0001000.0
Percentage of FinancingReceivableModificationAllowanceForCreditLosses0.00.015.91.40.06.027.17.036.841.726.064.316.77.21.33.05.39.70.00.05.6

nwbi:FinancingReceivableModificationsAmountPaidOff us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable

nwbi:FinancingReceivableModificationsAmountPaidOff

nwbi:CommercialRealEstateOwnerOccupied


None
Period End2020-06-302020-03-312019-06-302019-03-31
Value25000.0000
Percentage of FinancingReceivableModificationsAmountPaidOff100.00.00.00.0

us-gaap:CommercialLoan


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312013-09-302013-06-302013-03-312012-06-30
Value183000.034000.045000.02000.000-4804000.0169000.002232000.00123000.0383000.01750000.01226000.0253000.0197000.0138000.01432000.077000.0219000.001500000.01647000.0353000.0574000.0
Percentage of FinancingReceivableModificationsAmountPaidOff732.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CommercialRealEstate


None
Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302013-09-302013-06-302013-03-31
Value026000.0289000.01594000.00360000.0249000.01574000.0564000.0480000.02249000.0541000.0310000.0
Percentage of FinancingReceivableModificationsAmountPaidOff0.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:HomeEquityLoan


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value3000.0053000.068000.075000.00-142000.012000.035000.012000.0030000.032000.0038000.0264000.01000.0231000.0113000.075000.006000.0
Percentage of FinancingReceivableModificationsAmountPaidOff12.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:ResidentialMortgage


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312013-09-30
Value0330000.045000.00180000.00-515000.02000.06000.0249000.000008000.0143000.00056000.0053000.000
Percentage of FinancingReceivableModificationsAmountPaidOff0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

nwbi:FinancingReceivableModificationsNumberOfContracts2Additions

nwbi:FinancingReceivableModificationsNumberOfContracts2Additions


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value1.02.09.03.02.003.07.010.09.011.06.01.06.011.05.09.09.015.05.04.02.024.010.06.07.0
Percentage of FinancingReceivableModificationsNumberOfContracts2Additions100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

nwbi:FinancingReceivableModificationsNumberOfContractsChargedOff us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable

nwbi:FinancingReceivableModificationsNumberOfContractsChargedOff

us-gaap:CommercialLoan


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value0002.0001.05.001.0005.01.001.001.00002.0
Percentage of FinancingReceivableModificationsNumberOfContractsChargedOff0.00.00.0100.00.00.0100.0100.00.0100.00.00.0100.0100.00.0100.00.0100.00.00.00.0100.0

us-gaap:CommercialRealEstate


None
Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-30
Value000001.001.02.00
Percentage of FinancingReceivableModificationsNumberOfContractsChargedOff0.00.00.00.00.020.00.0100.00.00.0

us-gaap:HomeEquityLoan


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value01.0000000001.0000000001.01.02.0
Percentage of FinancingReceivableModificationsNumberOfContractsChargedOff0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0100.0

us-gaap:ResidentialMortgage


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value0000000001.01.000000000000
Percentage of FinancingReceivableModificationsNumberOfContractsChargedOff0.00.00.00.00.00.00.00.00.0100.00.00.00.00.00.00.00.00.00.00.00.00.0

nwbi:FinancingReceivableModificationsNumberOfContractsPaidOff us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable

nwbi:FinancingReceivableModificationsNumberOfContractsPaidOff

nwbi:CommercialRealEstateOwnerOccupied


None
Period End2020-06-302020-03-312019-06-302019-03-31
Value1.0000
Percentage of FinancingReceivableModificationsNumberOfContractsPaidOff100.00.00.00.0

us-gaap:CommercialLoan


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312013-09-302013-06-302013-03-312012-06-30
Value2.03.04.01.0001.03.005.01.02.05.03.04.03.01.02.06.02.06.0012.02.08.02.0
Percentage of FinancingReceivableModificationsNumberOfContractsPaidOff200.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CommercialRealEstate


None
Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302013-09-302013-06-302013-03-31
Value01.03.06.002.03.04.01.08.02.04.01.0
Percentage of FinancingReceivableModificationsNumberOfContractsPaidOff0.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:HomeEquityLoan


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value2.002.03.04.001.02.01.01.003.04.01.02.02.01.02.02.02.001.0
Percentage of FinancingReceivableModificationsNumberOfContractsPaidOff200.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:ResidentialMortgage


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312013-09-30
Value02.01.004.001.02.01.01.000001.03.0001.001.000
Percentage of FinancingReceivableModificationsNumberOfContractsPaidOff0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

nwbi:FinancingReceivableModificationsNumberOfContractsRemodified

nwbi:FinancingReceivableModificationsNumberOfContractsRemodified


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302012-12-312012-09-30
Value2.02.008.0003.03.0002.02.01.002.01.03.01.001.01.01.03.04.004.07.04.03.04.08.0
Percentage of FinancingReceivableModificationsNumberOfContractsRemodified100.0100.00.0100.00.00.0100.0100.00.00.0100.0100.0100.00.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0

nwbi:FinancingReceivableModificationsRecordedInvestmentAdditions

nwbi:FinancingReceivableModificationsRecordedInvestmentAdditions


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-30
Value0.0672.5182.5180.520.3060.0-4.6430.6470.8614.9350.7650.5460.3483.791.1090.2451.6623.3495.7652.2730.3860.1121.3475.3021.3431.468191.9773.7225.6112210
Percentage of FinancingReceivableModificationsRecordedInvestmentAdditions100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

nwbi:FinancingReceivableModificationsRecordedInvestmentNetPaydowns

nwbi:FinancingReceivableModificationsRecordedInvestmentNetPaydowns


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-30
Value1.1942.8411.3525.6680.00.7963.5691.2150.8750.9477.870.9871.4581.2224.3521.7811.4211.4831.7337.0963.6170.8233.3945.4112.5264.494142.8785.5692.3379.4433.034
Percentage of FinancingReceivableModificationsRecordedInvestmentNetPaydowns100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

nwbi:FinancingReceivableModificationsRecordedInvestmentReModifications

nwbi:FinancingReceivableModificationsRecordedInvestmentReModifications


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value3.4362.0760.9054.7730.00.02.780.3060.00.01.3890.2650.4450.01.5520.7990.8630.2-0.066.3160.0450.0851.3382.1780.00.159
Percentage of FinancingReceivableModificationsRecordedInvestmentReModifications100.0100.0100.0100.00.00.0100.0100.00.00.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0

nwbi:MortgageBankingIncome

nwbi:MortgageBankingIncome


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value121.1941.4941.9210.1880.2160.2130.0820.0770.2240.2250.5190.4340.242.3441.8860.4460.2180.2080.2670.2180.240.2690.2390.2650.2490.2280.2030.2360.9561.8741.4840.7890.531-0.0290.40.290.1971.4230.7520.029
Percentage of MortgageBankingIncome100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

nwbi:NoninterestExpenseCollectionOfReceivables

nwbi:NoninterestExpenseCollectionOfReceivables


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value644000.0474000.0566000.0747000.0939000.0308000.0780000.0483000.0434000.0512000.01179000.0568000.0553000.0549000.0437000.0589000.0729000.0676000.01252000.0624000.0603000.0768000.0
Percentage of NoninterestExpenseCollectionOfReceivables100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

nwbi:OriginationsOfLoansReceivableHeldForInvestment

nwbi:OriginationsOfLoansReceivableHeldForInvestment


None
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
Value15998669961080880763-1979.439773759723-1930.8097137186197557296146076416815004964745304924475365525764075205375504803168-517.084-426.011-375.3033415-481.909-506.63-497.2
Percentage of OriginationsOfLoansReceivableHeldForInvestment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

nwbi:RestructuringAndAcquisitionRelatedCosts

nwbi:RestructuringAndAcquisitionRelatedCosts


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-31
Value9.6792.4581.1140.0231.1051.9260.4350.1860.3930.00.1641.3982.6340.2237.1833.3860.6357.590.4670.347
Percentage of RestructuringAndAcquisitionRelatedCosts100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

nwbi:TransferOfOtherRealEstateAndOtherRepossessedPersonalProperty

nwbi:TransferOfOtherRealEstateAndOtherRepossessedPersonalProperty


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value0.8891.3511.4661.0111.8461.4922.1471.4351.2032.3963.38-0.3121.8113.2513.3751.0230.3231.5310.8911.732.3892.6233.6623.4511.8681.8392.8624.6484.0342.9852.9395.1035.4816.557103.3244.3432.052
Percentage of TransferOfOtherRealEstateAndOtherRepossessedPersonalProperty100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AccretionAmortizationOfDiscountsAndPremiumsInvestments

us-gaap:AccretionAmortizationOfDiscountsAndPremiumsInvestments


None
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
Value-744000.0-233000.0-245000.0-236000.0-205000.0-236000.0-554000.0-419000.0-432000.0-466000.0-482000.0-485000.0-532000.0-518000.0-606000.0-498000.0-491000.0-544000.0-613000.0-363000.0-86000.0-87000.0-95000.0-78000.0-105000.0-105000.0-94000.0-145000.0-2000.0-57000.017000.040000.0-35000.054000.0-55000.0-17000.0-86000.0344000.0-584000.0-387000.0354000.0747000.0
Percentage of AccretionAmortizationOfDiscountsAndPremiumsInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AllowanceForLoanAndLeaseLossesLoansSold

us-gaap:AllowanceForLoanAndLeaseLossesLoansSold


None
Period End2020-06-30
Value0.0
Percentage of AllowanceForLoanAndLeaseLossesLoansSold0.0

us-gaap:BankOwnedLifeInsuranceIncome

us-gaap:BankOwnedLifeInsuranceIncome


None
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
Value1248000.01036000.01121000.01095000.01197000.01005000.01038000.01460000.02333000.0990000.02295000.01078000.01652000.01068000.01281000.01380000.01105000.01595000.01251000.01166000.01008000.0913000.01057000.01083000.01050000.01001000.01846000.01178000.01088000.01085000.01589000.01148000.01107000.01117000.01199000.01938000.01716000.01166000.01228000.01212000.01474000.01166000.0
Percentage of BankOwnedLifeInsuranceIncome100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:BusinessCombinationConsiderationTransferred1 us-gaap:BusinessAcquisition

us-gaap:BusinessCombinationConsiderationTransferred1

nwbi:MutualFirstFinancialInc.


None
Period End2020-04-24
Value213
Percentage of BusinessCombinationConsiderationTransferred1100.0

us-gaap:BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable us-gaap:BusinessAcquisition

us-gaap:BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable

nwbi:MutualFirstFinancialInc.


None
Period End2020-04-24
Value213
Percentage of BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable100.0

us-gaap:CommonStockDividendsPerShareCashPaid

us-gaap:CommonStockDividendsPerShareCashPaid


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value0.190.190.190.180.180.180.170.170.170.170.160.160.160.160.150.150.150.150.140.140.140.140.130.131.130.230.130.130.240.240.120.120.120.110.110.110.10.10.10.10.1
Percentage of CommonStockDividendsPerShareCashPaid100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DebtAndEquitySecuritiesGainLoss

us-gaap:DebtAndEquitySecuritiesGainLoss


None
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
Value-8000.0181000.027000.0029000.0-6000.04000.000153000.0-369000.01497000.03000.0
Percentage of DebtAndEquitySecuritiesGainLoss100.0100.0100.00.0100.0100.0100.00.00.0100.0100.0100.0100.0

us-gaap:DebtInstrumentBasisSpreadOnVariableRate1 us-gaap:DerivativeInstrumentRisk, us-gaap:VariableRate, dei:LegalEntity

us-gaap:DebtInstrumentBasisSpreadOnVariableRate1

us-gaap:InterestRateSwap, us-gaap:LondonInterbankOfferedRateLIBOR, nwbi:LNBStatutoryTrustII


None
Period End2020-03-31
Value0.0148
Percentage of DebtInstrumentBasisSpreadOnVariableRate1100.0

us-gaap:DebtInstrumentBasisSpreadOnVariableRate1 us-gaap:ScheduleOfSharesSubjectToMandatoryRedemptionBySettlementTerms, us-gaap:VariableRate, dei:LegalEntity

us-gaap:TrustPreferredSecuritiesSubjectToMandatoryRedemption, us-gaap:LondonInterbankOfferedRateLIBOR, nwbi:UnionNationalCapitalTrustI


None
Period End2020-03-31
Value0.0285
Percentage of DebtInstrumentBasisSpreadOnVariableRate1192.6

us-gaap:TrustPreferredSecuritiesSubjectToMandatoryRedemption, us-gaap:LondonInterbankOfferedRateLIBOR, nwbi:UnionNationalCapitalTrustII


None
Period End2020-03-31
Value0.02
Percentage of DebtInstrumentBasisSpreadOnVariableRate1135.1

us-gaap:DefinedBenefitPlanAmortizationOfGainsLosses us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanAmortizationOfGainsLosses

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


None
Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-30
Value-4000.0-5000.0-17000.0-17000.0-17000.0-24000.0-25000.0-24000.0-27000.0-27000.0-27000.0-22000.0-22000.0
Percentage of DefinedBenefitPlanAmortizationOfGainsLosses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PensionPlansDefinedBenefit


None
Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-30
Value-924000.0-924000.0-856000.0-873000.0-855000.0-872000.0-872000.0-873000.0-928000.0-927000.0-928000.0-927000.0-928000.0
Percentage of DefinedBenefitPlanAmortizationOfGainsLosses23100.018480.05035.35135.35029.43633.33488.03637.53437.03433.33437.04213.64218.2

us-gaap:DefinedBenefitPlanAmortizationOfPriorServiceCostCredit us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanAmortizationOfPriorServiceCostCredit

us-gaap:PensionPlansDefinedBenefit


None
Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-30
Value-581000.0-581000.0-581000.0-580000.0-581000.0-581000.0-580000.0-581000.0-580000.0-581000.0-581000.0-581000.0-580000.0
Percentage of DefinedBenefitPlanAmortizationOfPriorServiceCostCredit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DefinedBenefitPlanExpectedReturnOnPlanAssets us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanExpectedReturnOnPlanAssets

us-gaap:PensionPlansDefinedBenefit


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value3.0913.0912.7592.7592.7592.7592.9922.9922.9922.9922.6282.6282.6282.6282.4742.4742.475
Percentage of DefinedBenefitPlanExpectedReturnOnPlanAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DefinedBenefitPlanInterestCost us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanInterestCost

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value6000.07000.013000.013000.013000.011000.013000.014000.013000.014000.017000.017000.017000.018000.017000.018000.018000.0
Percentage of DefinedBenefitPlanInterestCost100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PensionPlansDefinedBenefit


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value1714000.01714000.01838000.01839000.01851000.01827000.01678000.01678000.01678000.01678000.01720000.01719000.01703000.01737000.01694000.01695000.01695000.0
Percentage of DefinedBenefitPlanInterestCost28566.724485.714138.514146.214238.516609.112907.711985.712907.711985.710117.610111.810017.69650.09964.79416.79416.7

us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value10000.012000.030000.030000.030000.028000.038000.038000.038000.038000.044000.044000.044000.045000.040000.040000.040000.0
Percentage of DefinedBenefitPlanNetPeriodicBenefitCost100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PensionPlansDefinedBenefit


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value1064000.01064000.0841000.0842000.0659000.0616000.0694000.0693000.0694000.0694000.0976000.0976000.0959000.0993000.0942000.0941000.0942000.0
Percentage of DefinedBenefitPlanNetPeriodicBenefitCost10640.08866.72803.32806.72196.72200.01826.31823.71826.31826.32218.22218.22179.52206.72355.02352.52355.0

us-gaap:DefinedBenefitPlanServiceCost us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanServiceCost

us-gaap:PensionPlansDefinedBenefit


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value2098000.02098000.01487000.01487000.01274000.01274000.01716000.01716000.01716000.01716000.01537000.01537000.01538000.01537000.01374000.01374000.01374000.0
Percentage of DefinedBenefitPlanServiceCost100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DepreciationAmortizationAndAccretionNet

us-gaap:DepreciationAmortizationAndAccretionNet


None
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
Value2.6331.4132.897-0.4770.1191.2850.5220.892.9553.7533.3422.8362.5335.5825.454.6422.4752.8574.1672.221.0221.5492.8932.0382.0922.8452.3141.931.6523.0562.33.4751.2242.4670.9332.2230.5264.1083.9883.6913.4533.639
Percentage of DepreciationAmortizationAndAccretionNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet us-gaap:IncomeStatementLocation

us-gaap:DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet

nwbi:MortgageBankingIncome


None
Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-09-30
Value8247000.01000.0720000.0000
Percentage of DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet100.0100.0100.00.00.00.0

us-gaap:OtherIncome


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value-345000.0-177000.0132000.0-125000.00000
Percentage of DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet-4.2-17700.00.0-17.40.00.00.00.0

us-gaap:DividendIncomeOperating

us-gaap:DividendIncomeOperating


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value309000.0262000.0262000.0307000.0316000.0171000.0151000.0119000.085000.097000.078000.063000.050000.059000.0285000.0218000.0401000.0467000.0499000.0451000.0475000.01403000.0
Percentage of DividendIncomeOperating100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DividendsCash

us-gaap:DividendsCash


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value24201919191817171717161616161515141413121212121210421111121221111111011111010111111
Percentage of DividendsCash100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DividendsCash us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value24201919191817171717161616161515141413121212121210421111121221111111011111010111111
Percentage of DividendsCash100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases

us-gaap:FairValueInputsLevel3


None
Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-09-30
Value6909000.00505000.0000
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases100.00.0100.00.00.00.0

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales

us-gaap:FairValueInputsLevel3


None
Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-09-30
Value0.0-0.0520.00.00.00.0
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales0.0100.00.00.00.00.0

us-gaap:FeesAndCommissionsMortgageBankingAndServicing

us-gaap:FeesAndCommissionsMortgageBankingAndServicing


None
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
Value13151413131212131211121212
Percentage of FeesAndCommissionsMortgageBankingAndServicing100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FinancingReceivableAllowanceForCreditLossPurchasedWithCreditDeteriorationIncrease

us-gaap:FinancingReceivableAllowanceForCreditLossPurchasedWithCreditDeteriorationIncrease


None
Period End2020-06-30
Value8845000.0
Percentage of FinancingReceivableAllowanceForCreditLossPurchasedWithCreditDeteriorationIncrease100.0

us-gaap:FinancingReceivableAllowanceForCreditLossPurchasedWithCreditDeteriorationIncrease us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType

nwbi:OffBalanceSheetExposure


None
Period End2020-06-30
Value0
Percentage of FinancingReceivableAllowanceForCreditLossPurchasedWithCreditDeteriorationIncrease0.0

us-gaap:FinancingReceivableAllowanceForCreditLossPurchasedWithCreditDeteriorationIncrease us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType, us-gaap:FinancingReceivablePortfolioSegment

nwbi:OffBalanceSheetExposure, nwbi:BusinessBanking


None
Period End2020-06-30
Value0
Percentage of FinancingReceivableAllowanceForCreditLossPurchasedWithCreditDeteriorationIncrease0.0

nwbi:OffBalanceSheetExposure, nwbi:PersonalBanking


None
Period End2020-06-30
Value0
Percentage of FinancingReceivableAllowanceForCreditLossPurchasedWithCreditDeteriorationIncrease0.0

us-gaap:FinancingReceivableAllowanceForCreditLossPurchasedWithCreditDeteriorationIncrease us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable

nwbi:OffBalanceSheetExposure, nwbi:BusinessBanking, nwbi:CommercialRealEstateOwnerOccupied


None
Period End2020-06-30
Value0
Percentage of FinancingReceivableAllowanceForCreditLossPurchasedWithCreditDeteriorationIncrease0.0

nwbi:OffBalanceSheetExposure, nwbi:BusinessBanking, us-gaap:CommercialLoan


None
Period End2020-06-30
Value0
Percentage of FinancingReceivableAllowanceForCreditLossPurchasedWithCreditDeteriorationIncrease0.0

nwbi:OffBalanceSheetExposure, nwbi:BusinessBanking, us-gaap:CommercialRealEstate


None
Period End2020-06-30
Value0
Percentage of FinancingReceivableAllowanceForCreditLossPurchasedWithCreditDeteriorationIncrease0.0

nwbi:OffBalanceSheetExposure, nwbi:PersonalBanking, us-gaap:HomeEquityLoan


None
Period End2020-06-30
Value0
Percentage of FinancingReceivableAllowanceForCreditLossPurchasedWithCreditDeteriorationIncrease0.0

us-gaap:FinancingReceivableAllowanceForCreditLossPurchasedWithCreditDeteriorationIncrease us-gaap:FinancingReceivablePortfolioSegment

nwbi:BusinessBanking


None
Period End2020-06-30
Value7142000.0
Percentage of FinancingReceivableAllowanceForCreditLossPurchasedWithCreditDeteriorationIncrease80.7

nwbi:PersonalBanking


None
Period End2020-06-30
Value1703000.0
Percentage of FinancingReceivableAllowanceForCreditLossPurchasedWithCreditDeteriorationIncrease19.3

us-gaap:FinancingReceivableAllowanceForCreditLossPurchasedWithCreditDeteriorationIncrease us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable

nwbi:BusinessBanking, nwbi:CommercialRealEstateOwnerOccupied


None
Period End2020-06-30
Value963000.0
Percentage of FinancingReceivableAllowanceForCreditLossPurchasedWithCreditDeteriorationIncrease10.9

nwbi:BusinessBanking, us-gaap:CommercialLoan


None
Period End2020-06-30
Value459000.0
Percentage of FinancingReceivableAllowanceForCreditLossPurchasedWithCreditDeteriorationIncrease5.2

nwbi:BusinessBanking, us-gaap:CommercialRealEstate


None
Period End2020-06-30
Value5720000.0
Percentage of FinancingReceivableAllowanceForCreditLossPurchasedWithCreditDeteriorationIncrease64.7

nwbi:PersonalBanking, us-gaap:AutomobileLoan


None
Period End2020-06-30
Value235000.0
Percentage of FinancingReceivableAllowanceForCreditLossPurchasedWithCreditDeteriorationIncrease2.7

nwbi:PersonalBanking, us-gaap:ConsumerLoan


None
Period End2020-06-30
Value157000.0
Percentage of FinancingReceivableAllowanceForCreditLossPurchasedWithCreditDeteriorationIncrease1.8

nwbi:PersonalBanking, us-gaap:HomeEquityLoan


None
Period End2020-06-30
Value216000.0
Percentage of FinancingReceivableAllowanceForCreditLossPurchasedWithCreditDeteriorationIncrease2.4

nwbi:PersonalBanking, us-gaap:ResidentialMortgage


None
Period End2020-06-30
Value1095000.0
Percentage of FinancingReceivableAllowanceForCreditLossPurchasedWithCreditDeteriorationIncrease12.4

us-gaap:FinancingReceivableAllowanceForCreditLossesRecovery

us-gaap:FinancingReceivableAllowanceForCreditLossesRecovery


None
Period End2020-06-302020-03-312019-06-302019-03-31
Value1535000.01793000.01525000.01445000.0
Percentage of FinancingReceivableAllowanceForCreditLossesRecovery100.0100.0100.0100.0

us-gaap:FinancingReceivableAllowanceForCreditLossesRecovery us-gaap:FinancingReceivablePortfolioSegment

nwbi:BusinessBanking


None
Period End2020-06-302020-03-31
Value631000.0721000.0
Percentage of FinancingReceivableAllowanceForCreditLossesRecovery41.140.2

nwbi:PersonalBanking


None
Period End2020-06-302020-03-31
Value904000.01072000.0
Percentage of FinancingReceivableAllowanceForCreditLossesRecovery58.959.8

us-gaap:FinancingReceivableAllowanceForCreditLossesRecovery us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable

nwbi:BusinessBanking, nwbi:CommercialRealEstateOwnerOccupied


None
Period End2020-06-302020-03-31
Value8000.07000.0
Percentage of FinancingReceivableAllowanceForCreditLossesRecovery0.50.4

nwbi:BusinessBanking, us-gaap:CommercialLoan


None
Period End2020-06-302020-03-31
Value169000.0424000.0
Percentage of FinancingReceivableAllowanceForCreditLossesRecovery11.023.6

nwbi:BusinessBanking, us-gaap:CommercialRealEstate


None
Period End2020-06-302020-03-31
Value454000.0290000.0
Percentage of FinancingReceivableAllowanceForCreditLossesRecovery29.616.2

nwbi:PersonalBanking, us-gaap:AutomobileLoan


None
Period End2020-06-302020-03-31
Value420000.0344000.0
Percentage of FinancingReceivableAllowanceForCreditLossesRecovery27.419.2

nwbi:PersonalBanking, us-gaap:ConsumerLoan


None
Period End2020-06-302020-03-31
Value400000.0416000.0
Percentage of FinancingReceivableAllowanceForCreditLossesRecovery26.123.2

nwbi:PersonalBanking, us-gaap:HomeEquityLoan


None
Period End2020-06-302020-03-31
Value76000.0205000.0
Percentage of FinancingReceivableAllowanceForCreditLossesRecovery5.011.4

nwbi:PersonalBanking, us-gaap:ResidentialMortgage


None
Period End2020-06-302020-03-31
Value8000.0107000.0
Percentage of FinancingReceivableAllowanceForCreditLossesRecovery0.56.0

us-gaap:FinancingReceivableAllowanceForCreditLossesWriteOffs

us-gaap:FinancingReceivableAllowanceForCreditLossesWriteOffs


None
Period End2020-06-302020-03-312019-06-302019-03-312011-09-302011-06-302010-09-302010-06-30
Value145.2668.8067.40510108.5337.812
Percentage of FinancingReceivableAllowanceForCreditLossesWriteOffs100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FinancingReceivableAllowanceForCreditLossesWriteOffs us-gaap:FinancingReceivablePortfolioSegment

nwbi:BusinessBanking


None
Period End2020-06-302020-03-31
Value111.146
Percentage of FinancingReceivableAllowanceForCreditLossesWriteOffs76.421.8

nwbi:PersonalBanking


None
Period End2020-06-302020-03-31
Value3.4024.12
Percentage of FinancingReceivableAllowanceForCreditLossesWriteOffs23.678.2

us-gaap:FinancingReceivableAllowanceForCreditLossesWriteOffs us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable

nwbi:BusinessBanking, nwbi:CommercialRealEstateOwnerOccupied


None
Period End2020-06-302020-03-31
Value0.00.021
Percentage of FinancingReceivableAllowanceForCreditLossesWriteOffs0.00.4

nwbi:BusinessBanking, us-gaap:CommercialLoan


None
Period End2020-06-302020-03-31
Value100.815
Percentage of FinancingReceivableAllowanceForCreditLossesWriteOffs71.715.5

nwbi:BusinessBanking, us-gaap:CommercialRealEstate


None
Period End2020-06-302020-03-31
Value0.690.31
Percentage of FinancingReceivableAllowanceForCreditLossesWriteOffs4.85.9

nwbi:PersonalBanking, us-gaap:AutomobileLoan


None
Period End2020-06-302020-03-31
Value1.7631.843
Percentage of FinancingReceivableAllowanceForCreditLossesWriteOffs12.235.0

nwbi:PersonalBanking, us-gaap:ConsumerLoan


None
Period End2020-06-302020-03-31
Value1.4281.645
Percentage of FinancingReceivableAllowanceForCreditLossesWriteOffs9.931.2

nwbi:PersonalBanking, us-gaap:HomeEquityLoan


None
Period End2020-06-302020-03-31
Value0.1730.289
Percentage of FinancingReceivableAllowanceForCreditLossesWriteOffs1.25.5

nwbi:PersonalBanking, us-gaap:ResidentialMortgage


None
Period End2020-06-302020-03-31
Value0.0380.343
Percentage of FinancingReceivableAllowanceForCreditLossesWriteOffs0.36.5

us-gaap:FinancingReceivableModificationsNumberOfContracts2

us-gaap:FinancingReceivableModificationsNumberOfContracts2


None
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
Value3.04.09.011.02.006.010.010.09.013.08.02.06.013.06.012.010.015.06.05.03.027.014.06.011.037.019.06.058.0
Percentage of FinancingReceivableModificationsNumberOfContracts2100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FinancingReceivableModificationsNumberOfContracts2 us-gaap:FinancingReceivablePortfolioSegment

nwbi:BusinessBanking


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value2.03.03.09.02.0-2.04.03.04.09.04.01.04.011.04.06.06.012.06.02.00
Percentage of FinancingReceivableModificationsNumberOfContracts266.775.033.381.8100.0-33.340.030.044.469.250.050.066.784.666.750.060.080.0100.040.00.0

nwbi:PersonalBanking


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value1.01.06.02.008.06.07.05.04.04.01.02.02.02.06.04.03.003.03.0
Percentage of FinancingReceivableModificationsNumberOfContracts233.325.066.718.20.0133.360.070.055.630.850.050.033.315.433.350.040.020.00.060.0100.0

us-gaap:FinancingReceivableModificationsNumberOfContracts2 us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable

nwbi:BusinessBanking, nwbi:CommercialRealEstateOwnerOccupied


None
Period End2020-06-302020-03-312019-06-30
Value02.00
Percentage of FinancingReceivableModificationsNumberOfContracts20.050.00.0

nwbi:BusinessBanking, us-gaap:CommercialLoan


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value1.01.02.01.01.0-2.01.02.03.04.02.001.09.03.04.04.07.01.01.00
Percentage of FinancingReceivableModificationsNumberOfContracts233.325.022.29.150.0-33.310.020.033.330.825.00.016.769.250.033.340.046.716.720.00.0

nwbi:BusinessBanking, us-gaap:CommercialRealEstate


None
Period End2020-06-302020-03-312019-09-302019-06-302018-09-302018-06-302018-03-312017-09-302017-06-30
Value1.008.01.03.01.01.02.01.0
Percentage of FinancingReceivableModificationsNumberOfContracts233.30.072.750.030.010.011.125.050.0

nwbi:PersonalBanking, us-gaap:HomeEquityLoan


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value1.01.04.01.005.04.05.03.01.02.0001.01.04.01.01.001.01.0
Percentage of FinancingReceivableModificationsNumberOfContracts233.325.044.49.10.083.340.050.033.37.725.00.00.07.716.733.310.06.70.020.033.3

nwbi:PersonalBanking, us-gaap:ResidentialMortgage


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value002.01.003.02.02.02.03.02.01.02.01.01.02.03.02.002.02.0
Percentage of FinancingReceivableModificationsNumberOfContracts20.00.022.29.10.050.020.020.022.223.125.050.033.37.716.716.730.013.30.040.066.7

us-gaap:FinancingReceivableModificationsPostModificationRecordedInvestment2

us-gaap:FinancingReceivableModificationsPostModificationRecordedInvestment2


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value3.5034.5942.4245.2930.306-0.9410.9410.8194.1682.0890.8070.7743.7651.3881.0412.4863.5335.7338.5360.4270.1964.6514.4441.2521.483151.8573.6574.838
Percentage of FinancingReceivableModificationsPostModificationRecordedInvestment2100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FinancingReceivableModificationsPreModificationRecordedInvestment2

us-gaap:FinancingReceivableModificationsPreModificationRecordedInvestment2


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value3.0214.5962.516.2020.31-1.8630.9530.8614.9352.1540.8110.7933.792.6611.0442.5253.5495.7058.5890.4310.1975.0195.3021.3431.468191.9773.7225.611
Percentage of FinancingReceivableModificationsPreModificationRecordedInvestment2100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FinancingReceivableModificationsPreModificationRecordedInvestment2 us-gaap:FinancingReceivablePortfolioSegment

nwbi:BusinessBanking


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value2.9544.5772.1756.0690.31-2.1260.4170.6244.5811.8170.2860.3483.3422.3121.0321.7752.9865.5598.5890.3090.0
Percentage of FinancingReceivableModificationsPreModificationRecordedInvestment297.899.686.797.9100.0114.143.872.592.884.435.343.988.286.998.970.384.197.4100.071.70.0

nwbi:PersonalBanking


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value0.0670.0190.3350.1330.00.2630.5360.2370.3540.3370.5250.4450.4480.3490.0120.750.5630.1460.00.1220.197
Percentage of FinancingReceivableModificationsPreModificationRecordedInvestment22.20.413.32.10.0-14.156.227.57.215.664.756.111.813.11.129.715.92.60.028.3100.0

us-gaap:FinancingReceivableModificationsPreModificationRecordedInvestment2 us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable

nwbi:BusinessBanking, nwbi:CommercialRealEstateOwnerOccupied


None
Period End2020-06-302020-03-312019-06-30
Value0.02.0770.0
Percentage of FinancingReceivableModificationsPreModificationRecordedInvestment20.045.20.0

nwbi:BusinessBanking, us-gaap:CommercialLoan


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value2.52.50.1560.0550.01-2.0280.0450.1432.180.1850.1720.00.2040.8330.8780.9631.7021.8760.0260.2970.0
Percentage of FinancingReceivableModificationsPreModificationRecordedInvestment282.854.46.20.93.2108.94.716.644.28.621.20.05.431.384.138.148.032.90.368.90.0

nwbi:BusinessBanking, us-gaap:CommercialRealEstate


None
Period End2020-06-302020-03-312019-09-302019-06-302018-09-302018-06-302018-03-312017-09-302017-06-30
Value0.4540.06.0140.30.3720.4812.4010.1140.348
Percentage of FinancingReceivableModificationsPreModificationRecordedInvestment215.00.097.096.839.055.948.714.143.9

nwbi:PersonalBanking, us-gaap:HomeEquityLoan


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value0.0670.0190.1590.0120.00.1250.1940.1770.140.030.1220.00.00.1910.0030.2240.0560.0140.00.0020.085
Percentage of FinancingReceivableModificationsPreModificationRecordedInvestment22.20.46.30.20.0-6.720.420.62.81.415.00.00.07.20.38.91.60.20.00.543.1

nwbi:PersonalBanking, us-gaap:ResidentialMortgage


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value0.00.00.1760.1210.00.1380.3420.060.2140.3070.4030.4450.4480.1580.0090.5260.5070.1320.00.120.112
Percentage of FinancingReceivableModificationsPreModificationRecordedInvestment20.00.07.02.00.0-7.435.97.04.314.349.756.111.85.90.920.814.32.30.027.856.9

us-gaap:FinancingReceivablesImpairedTroubledDebtRestructuringWriteDown us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable

us-gaap:FinancingReceivablesImpairedTroubledDebtRestructuringWriteDown

us-gaap:CommercialLoan


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312013-09-302013-06-302013-03-31
Value000235000.0005000.0619000.00721000.000158000.0101000.0099000.0043000.0000387000.0233000.0017000.0
Percentage of FinancingReceivablesImpairedTroubledDebtRestructuringWriteDown0.00.00.0100.00.00.0100.0100.00.0100.00.00.0100.0100.00.0100.00.0100.00.00.00.0100.0100.00.0100.0

us-gaap:CommercialRealEstate


None
Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302013-09-302013-06-302013-03-31
Value0000091000.00203000.02498000.000450000.0650000.0
Percentage of FinancingReceivablesImpairedTroubledDebtRestructuringWriteDown0.00.00.00.00.014.70.028.20.00.00.00.03823.5

us-gaap:HomeEquityLoan


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value010000.00000000048000.00000000060000.068000.031000.0
Percentage of FinancingReceivablesImpairedTroubledDebtRestructuringWriteDown0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.08.0

us-gaap:ResidentialMortgage


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312013-09-30
Value000000000135000.077000.000000000000185000.0
Percentage of FinancingReceivablesImpairedTroubledDebtRestructuringWriteDown0.00.00.00.00.00.00.00.00.018.70.00.00.00.00.00.00.00.00.00.00.00.079.4

us-gaap:ForeclosedRealEstateExpense

us-gaap:ForeclosedRealEstateExpense


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value89000.095000.072000.0119000.0128000.0159000.0187000.0205000.0133000.0292000.0195000.0310000.0217000.0282000.0192000.0206000.0295000.0311000.0393000.0471000.0514000.0692000.0406000.0636000.0459000.0639000.0557000.0681000.0600000.0599000.0477000.0832000.0571000.0740000.0462000.0483000.0249000.0431000.0
Percentage of ForeclosedRealEstateExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:GainLossOnSalesOfLoansNet

us-gaap:GainLossOnSalesOfLoansNet


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value01302000.0908000.0826000.00000
Percentage of GainLossOnSalesOfLoansNet0.0100.0100.0100.00.00.00.00.0

us-gaap:GainsLossesOnSalesOfAssets

us-gaap:GainsLossesOnSalesOfAssets


None
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
Value-1754000.01918000.01982000.01915000.0-615000.0-810000.081000.0-643000.0-106000.0-1009000.0-816000.01082000.0-49000.0410000.01534000.0838000.01167000.0960000.0362000.0248000.0585000.0-274000.0555000.0807000.0272000.03602000.05248000.0229000.0-143000.0727000.04533000.079000.0-554000.0-1164000.0-6272000.01676000.0989000.0608000.0-1830000.01322000.0928000.0-1230000.0
Percentage of GainsLossesOnSalesOfAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:GainsLossesOnSalesOfOtherRealEstate

us-gaap:GainsLossesOnSalesOfOtherRealEstate


None
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
Value-97000.0-91000.086000.0-227000.091000.0-3000.0-14000.0-247000.0176000.0-546000.0-307000.0-193000.0-230000.0-67000.0164000.0-563000.0111000.0249000.0-156000.0-246000.0-541000.0-1046000.0-30000.0-240000.0-562000.0-135000.0-660000.0-111000.0-2285000.0-130000.0-2804000.0-1187000.0-582000.0-1070000.0-466000.0-1340000.0-593000.0-27000.0-279000.0-2014000.0-255000.0-24000.0
Percentage of GainsLossesOnSalesOfOtherRealEstate100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:GoodwillAcquiredDuringPeriod

us-gaap:GoodwillAcquiredDuringPeriod


None
Period End2020-03-312019-03-312018-03-312017-03-312016-03-312015-03-312014-03-312013-03-31
Value0.0370.00.00.00.1751.5250.002
Percentage of GoodwillAcquiredDuringPeriod0.0100.00.00.00.0100.0100.0100.0

us-gaap:ImpairedFinancingReceivableInterestIncomeAccrualMethod

us-gaap:ImpairedFinancingReceivableInterestIncomeAccrualMethod


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-30
Value171000.0217000.0320000.0595000.01042000.01113000.0971000.0994000.0883000.0914000.0884000.01026000.0975000.01097000.01302000.01323000.01443000.01528000.01189000.01420000.01370000.01594000.01474000.01433000.01482000.01532000.01505000.01436000.01571000.01736000.01719000.01498000.0116000.0252000.0
Percentage of ImpairedFinancingReceivableInterestIncomeAccrualMethod100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ImpairmentOfRealEstate

us-gaap:ImpairmentOfRealEstate


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-31
Value120000.0100000.059000.0211000.0177000.0160000.0237000.0341000.0166000.0774000.0251000.0261000.0301000.0418000.0207000.0347000.0163000.0764000.0583000.0413000.0746000.01181000.0474000.0463000.0733000.0648000.0578000.0609000.02525000.0446000.02813000.01243000.0350000.0536000.0591000.0442000.00416000.00
Percentage of ImpairmentOfRealEstate100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.00.0

us-gaap:IncomeTaxesPaid

us-gaap:IncomeTaxesPaid


None
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
Value1.750.556144.289.0251.7476.55107.7821.36711109.8050.05.6242.5840.7690.7335.9885.9083.7961.0276.6994.4719.8565.0160.7046.217123.5873.8896.0973.3370.9557.5966.1859.2180.9174.2147.4597.510.532
Percentage of IncomeTaxesPaid100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInAdvancePaymentsByBorrowersForTaxesAndInsurance

us-gaap:IncreaseDecreaseInAdvancePaymentsByBorrowersForTaxesAndInsurance


None
Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-31
Value9.4162.598-30.1769.6021.587-28.3437.9862.829-26.5827.9763.591-26.9556.5694.984-23.86.7654.491
Percentage of IncreaseDecreaseInAdvancePaymentsByBorrowersForTaxesAndInsurance100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInDeposits

us-gaap:IncreaseDecreaseInDeposits


None
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
Value1053200-89.493-2.39391218-59.774-53.42521158-115.064-29.202-230.157103-104.833-76.044-34.0657-32.161-90.0151249-75.181-66.199-0.941105-56.486-57.727-17.05935-60.15618-63.89189-32.425-6.556-1.23156-4.604393569
Percentage of IncreaseDecreaseInDeposits100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInOtherOperatingAssets

us-gaap:IncreaseDecreaseInOtherOperatingAssets


None
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
Value7.933381.7746.2031641-2.5242.9657.281-1.29415-1.596-13.288-7.634-2.365-0.083-25.1681.663-0.436-26.3-5.548-5.685-2.62-2.035.412-10.003-6.6865.535-2.446-8.754-4.2190.102-4.682-9.8963.0380.441-2.239-8.774-59.667531.456-6.54
Percentage of IncreaseDecreaseInOtherOperatingAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInOtherOperatingLiabilities

us-gaap:IncreaseDecreaseInOtherOperatingLiabilities


None
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
Value2349-20.9766.0593236-1.1774.3243.088-7.3649.9333.4952.731-4.465-4.2026.719-9.62311-10.005-10.1620.0331.136-19.018-0.3083.003-6.534-1.2414.1525.001-5.0221.4593.4643.8812.547-27.1961.9964.278-4.045-3.618-1.0535.646-6.216
Percentage of IncreaseDecreaseInOtherOperatingLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InformationTechnologyAndDataProcessing

us-gaap:InformationTechnologyAndDataProcessing


None
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
Value111110111010109.629.569.7069.8889.659.6399.9099.4298.8448.1728.4148.0578.1267.3927.2056.726.7236.6396.5896.2696.0367.395.8536.4596.346.0596.1425.9825.8965.6875.7676.0415.8635.5525.696
Percentage of InformationTechnologyAndDataProcessing100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InterestAndDividendIncomeOperating

us-gaap:InterestAndDividendIncomeOperating


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value10810010310610610097959289919089879086868585817575767676757677788083848586889090919394929190909092
Percentage of InterestAndDividendIncomeOperating100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InterestExpenseBorrowings

us-gaap:InterestExpenseBorrowings


None
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
Value1.1331.7471.582.2361.722.1621.9521.5551.341.3081.351.1991.241.2251.2321.8014.1437.6588.0517.9878.1018.1337.8767.8827.7937.7147.8948.1268.0327.8317.9988.0137.9127.8998.0418.0617.9897.9898.7629.5879.7049.7
Percentage of InterestExpenseBorrowings100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InterestExpenseDeposits

us-gaap:InterestExpenseDeposits


None
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
Value9.33611121312108.9858.2337.3096.4585.9715.7955.8265.4655.8595.6535.8656.0886.4356.1635.6915.7666.1066.3056.4216.496.9117.157.4047.8149.0421011121414151617171821
Percentage of InterestExpenseDeposits100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InterestIncomeDepositsWithFinancialInstitutions

us-gaap:InterestIncomeDepositsWithFinancialInstitutions


None
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
Value185000.0135000.0169000.0172000.0159000.0100000.069000.0162000.0469000.0135000.059000.0244000.0536000.0660000.0300000.0114000.070000.059000.013000.099000.0180000.0139000.0164000.0187000.0286000.0200000.0249000.0253000.0340000.0251000.0382000.0364000.0473000.0380000.0423000.0393000.0489000.0407000.0496000.0524000.0512000.0565000.0
Percentage of InterestIncomeDepositsWithFinancialInstitutions100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InterestIncomeExpenseAfterProvisionForLoanLoss

us-gaap:InterestIncomeExpenseAfterProvisionForLoanLoss


None
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
Value465980878781837878777780777578737269666361606158535361575757585960595658585953565551
Percentage of InterestIncomeExpenseAfterProvisionForLoanLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InterestIncomeSecuritiesMortgageBacked

us-gaap:InterestIncomeSecuritiesMortgageBacked


None
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
Value4.0384.1754.2374.1884.283.9653.9423.5723.2543.0133.0163.1182.9872.2222.1662.032.1152.2292.3012.232.0582.2342.3572.5042.6662.7932.9563.1133.3083.4413.6973.9414.4094.6915.0775.5446.0736.7565.8866.5346.7066.145
Percentage of InterestIncomeSecuritiesMortgageBacked100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InterestIncomeSecuritiesTaxExempt

us-gaap:InterestIncomeSecuritiesTaxExempt


None
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
Value0.5640.1850.2010.2240.2370.1820.170.2050.3130.390.4490.4760.5290.5690.6250.6760.7070.7240.8360.9861.1431.3481.4671.5611.5981.6551.7481.9122.0942.0632.1322.2232.3182.4462.62.8482.9923.0743.1113.092.8532.684
Percentage of InterestIncomeSecuritiesTaxExempt100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InterestIncomeSecuritiesTaxable

us-gaap:InterestIncomeSecuritiesTaxable


None
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
Value439000.0648000.0683000.0884000.0898000.0936000.0924000.0814000.0648000.0678000.0805000.0957000.0981000.01006000.0988000.0627000.0756000.01038000.0-1221000.01689000.01604000.01045000.01032000.01004000.01014000.01080000.01052000.01030000.01034000.0905000.0743000.0577000.0435000.0573000.0776000.0684000.0594000.0398000.0428000.0489000.0599000.0998000.0
Percentage of InterestIncomeSecuritiesTaxable100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LaborAndRelatedExpense

us-gaap:LaborAndRelatedExpense


None
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
Value404242404238393739363836373734393433323128273128282728272827282827272526292525242425
Percentage of LaborAndRelatedExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:MarketingExpense

us-gaap:MarketingExpense


None
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
Value2047000.01507000.01010000.01373000.02729000.01886000.02331000.01949000.02014000.02140000.02125000.02488000.02846000.02148000.02181000.02239000.02541000.01891000.01642000.01691000.03190000.01976000.01434000.02211000.02931000.01637000.01259000.01032000.02093000.01900000.0134000.01830000.03829000.02036000.03098000.02788000.02108000.01959000.02930000.02208000.03294000.01443000.0
Percentage of MarketingExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:NoncashOrPartNoncashAcquisitionNetNonmonetaryAssetsAcquiredLiabilitiesAssumed1

us-gaap:NoncashOrPartNoncashAcquisitionNetNonmonetaryAssetsAcquiredLiabilitiesAssumed1


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302016-12-312016-09-302015-12-312015-09-30
Value18720.00.7460.00.04940.00.00.00.00.00.0-15.71216640.01099
Percentage of NoncashOrPartNoncashAcquisitionNetNonmonetaryAssetsAcquiredLiabilitiesAssumed1100.00.0100.00.00.0100.00.00.00.00.00.00.0100.0100.00.0100.0

us-gaap:NoncashOrPartNoncashAcquisitionValueOfAssetsAcquired1

us-gaap:NoncashOrPartNoncashAcquisitionValueOfAssetsAcquired1


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value20850.03.8460.00.05800.00.00.00.00.00.00.4515440.810.00.01160-0.8760.4380.00.00.02.798
Percentage of NoncashOrPartNoncashAcquisitionValueOfAssetsAcquired1100.00.0100.00.00.0100.00.00.00.00.00.00.0100.0100.0100.00.00.0100.0100.0100.00.00.00.0100.0

us-gaap:NoncontrollingInterestIncreaseFromBusinessCombination

us-gaap:NoncontrollingInterestIncreaseFromBusinessCombination


None
Period End2020-06-30
Value105000.0
Percentage of NoncontrollingInterestIncreaseFromBusinessCombination100.0

us-gaap:NoncontrollingInterestIncreaseFromBusinessCombination us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital


None
Period End2020-06-30
Value105000.0
Percentage of NoncontrollingInterestIncreaseFromBusinessCombination100.0

us-gaap:NoninterestExpense

us-gaap:NoninterestExpense


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value897876707771726669677168737168751036361635553555353535250525150515151484952495049484864444744
Percentage of NoninterestExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:NoninterestIncome

us-gaap:NoninterestIncome


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value35272826232123222421222441212420201919181616171817192016131514141413141415141513151517131110
Percentage of NoninterestIncome100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:NoninterestIncomeOtherOperatingIncome

us-gaap:NoninterestIncomeOtherOperatingIncome


None
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
Value2.0441.8654.0772.51.932.0343.0281.8042.4752.2882.372.1842.731.4311.7811.071.7111.2191.6971.2880.7421.9631.1881.8361.6881.1750.8691.0490.8651.1760.9640.9491.2440.9971.4281.0021.0150.7681.0581.4391.3140.86
Percentage of NoninterestIncomeOtherOperatingIncome100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OccupancyNet

us-gaap:OccupancyNet


None
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
Value7.1957.4717.0517.0617.3877.2186.5676.8216.8247.3077.2936.9517.103
Percentage of OccupancyNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OciBeforeReclassificationsNetOfTaxAttributableToParent

us-gaap:OciBeforeReclassificationsNetOfTaxAttributableToParent


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value4.2537.748-9.4511.3155.6084.4524.785-1.778-1.023-3.595-0.0061.5080.961
Percentage of OciBeforeReclassificationsNetOfTaxAttributableToParent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OciBeforeReclassificationsNetOfTaxAttributableToParent us-gaap:StatementEquityComponents

us-gaap:AccumulatedDefinedBenefitPlansAdjustment


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value0.00.0-8.0590.00.00.0-1.1810.00.00.0-1.2540.00.00.0-2.3990.00.00.0-2.2030.00.00.0
Percentage of OciBeforeReclassificationsNetOfTaxAttributableToParent0.00.085.30.00.00.0-24.7-0.0-0.0-0.00.0-0.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedGainLossNetCashFlowHedgeParent


None
Period End2020-06-302020-03-312019-09-302019-06-302019-03-31
Value-0.537-0.4090.00.00.0
Percentage of OciBeforeReclassificationsNetOfTaxAttributableToParent-12.6-5.30.00.00.0

us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value4.798.157-1.3921.3155.6084.4525.892-1.97-1.237-3.955-4.162-0.2641.290.658-6.445-0.7851.0273.464-3.2282.379-1.7882.952
Percentage of OciBeforeReclassificationsNetOfTaxAttributableToParent112.6105.314.7100.0100.0100.0123.1110.8120.9110.00.04400.085.568.50.00.00.00.00.00.00.00.0

us-gaap:OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent

us-gaap:OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-30
Value4.7558.194-1.3941.3145.6074.4525.875-2.014-1.312-3.981-5.747-0.9381.2340.647-6.65-0.8211.0493.492-3.2122.259-2.0672.8842.072-1.9892.9193.692-8.2460.023-11.4670.604-1.9851.5820.7531.4570.7243.0785.138
Percentage of OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent

us-gaap:OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-0.249-0.2497.85-0.208-0.2090.2090.956-0.226-0.2260.226
Percentage of OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax

us-gaap:OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax


None
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
Value580000.0581000.02577000.0-581000.0580000.0581000.0225000.0226000.0226000.0226000.0220000.0221000.0221000.0220000.0197000.0224000.0226000.0225000.0-2075000.0219000.0219000.0219000.0-1908000.0-138000.0-138000.0-138000.0-2196000.0229000.0229000.0229000.0
Percentage of OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax

us-gaap:OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax


None
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
Value99000.099000.084000.083000.085000.082000.0475000.090000.091000.090000.0153000.0153000.0154000.0153000.0174000.0144000.0144000.0-144000.0-485000.0-140000.0-140000.0-140000.0682000.074000.074000.075000.01181000.0-123000.0-123000.0-123000.0
Percentage of OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent


None
Period End2020-06-302020-03-312019-09-302019-06-302019-03-31
Value-537000.0-409000.0000
Percentage of OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent100.0100.00.00.00.0

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationTaxParent

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationTaxParent


None
Period End2020-06-302020-03-312019-09-302019-06-302019-03-31
Value-47000.0-162000.0000
Percentage of OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationTaxParent100.0100.00.00.00.0

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTax

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTax


None
Period End2020-06-302020-03-312019-09-302019-06-302019-03-31
Value-90000.0-12000.0000
Percentage of OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTax100.0100.00.00.00.0

us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent

us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value4.4678.034-9.2441.5225.8164.6614.993-1.596-0.872-10.141-6.473-0.4591.6731.17-8.348-0.1261.4413.577-4.4752.523-1.363.147-17.707-1.4472.8793.8057.1410.546-9.6121.5138.1381.480.1122.008-16.9710.4343.8292.979
Percentage of OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent us-gaap:StatementEquityComponents

us-gaap:AccumulatedDefinedBenefitPlansAdjustment


None
Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value0.2490.2490.2080.2090.2090.2260.226-5.38-1.0340.2210.2210.22-2.2020.2240.2260.225-1.9850.2190.2190.219-19.896-0.138-0.138-0.138140.2290.2290.2298.1790.4310.4310.431
Percentage of OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent5.63.113.73.64.5-14.2-25.953.116.0-48.113.218.826.4-177.815.76.344.48.7-16.17.0112.49.5-4.8-3.6207.341.9-2.415.1100.529.1384.821.5

us-gaap:AccumulatedGainLossNetCashFlowHedgeParent


None
Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-06-30
Value-0.537-0.4090.00.00.00.214
Percentage of OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent-12.0-5.10.00.00.0-24.5

us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss


None
Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value4.7558.1941.3145.6074.452-2.014-1.312-4.972-5.747-0.9381.2340.647-6.65-0.8211.0493.492-3.2122.259-2.0672.8842.072-1.9892.9193.692-8.2460.023-11.4670.604-1.9851.5820.7531.457
Percentage of OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent106.4102.086.396.495.5126.2150.549.088.8204.473.855.379.7651.672.897.671.889.5152.091.6-11.7137.5101.497.0-115.54.2119.339.9-24.4106.9672.372.6

us-gaap:AccumulatedOtherComprehensiveIncome


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value4.4678.034-9.2441.5225.8164.6614.993-1.596-0.872-3.395-6.473-0.4591.6731.17-8.348-0.1261.4413.577-4.4752.523-1.363.147-17.707-1.4472.8793.8057.1410.546-9.6121.5138.1381.480.1122.008-16.9710.4343.8292.979
Percentage of OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent100.0100.0100.0100.0100.0100.0100.0100.0100.033.5100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax

us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax


None
Period End2020-06-302019-09-302019-06-302018-09-30
Value-48000.01000.0-2000.061000.0
Percentage of OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax

us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax


None
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
Value35000.0-37000.02000.01000.01000.0017000.044000.075000.026000.01585000.0674000.056000.011000.0205000.036000.0-22000.0-28000.0-16000.0120000.0279000.068000.0-179000.0419000.0204000.01904000.02756000.087000.068000.066000.0
Percentage of OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax

us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax


None
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
Value13000.0-14000.01000.001000.006000.017000.030000.07000.01072000.0369000.039000.08000.0128000.0-23000.014000.011000.0-10000.077000.0179000.043000.0-115000.0268000.0130000.01218000.01762000.055000.044000.043000.0
Percentage of OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax100.0100.0100.00.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax

us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax


None
Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-09-30
Value-928000.0-929000.0890000.0-871000.0-872000.0-897000.0
Percentage of OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossTaxPortionAttributableToParent1

us-gaap:OtherComprehensiveIncomeLossTaxPortionAttributableToParent1


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value1992000.03228000.0-3670000.0608000.02329000.01863000.02074000.0-664000.0-375000.0-1409000.0-4489000.0-242000.01078000.0622000.0-6864000.0-129000.0907000.02299000.0-2932000.01607000.0-915000.02006000.0-11371000.0-977000.01846000.02421000.06557000.0300000.0-6350000.0883000.04452000.01195000.0303000.01461000.0
Percentage of OtherComprehensiveIncomeLossTaxPortionAttributableToParent1100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax

us-gaap:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax


None
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
Value4.798.157-1.3921.3155.6084.4525.892-1.97-1.237-3.955-4.162-0.2641.290.658-6.445-0.7851.0273.464-3.2282.379-1.7882.9521.893-1.573.1235.596-5.9250.11-11.3990.67-1.7761.550.8941.361-1.0353.0784.3582.085-11.0692.6225.11.146
Percentage of OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax

us-gaap:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax


None
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
Value-1902000.0-3277000.08539000.0-525000.02243000.01781000.02356000.0-788000.0-494000.0-1587000.0-2910000.0-164000.0845000.0314000.0-4119000.0-503000.0659000.02220000.0-2062000.01520000.0-1139000.01885000.01213000.0-1002000.01997000.03579000.0-3784000.073000.0-7276000.0436000.0-1125000.0998000.0572000.0-870000.0-425000.0-1657000.0-2767000.0-1123000.06136000.0-1412000.0-2746000.0-732000.0
Percentage of OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherNoninterestExpense

us-gaap:OtherNoninterestExpense


None
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
Value7.8664.8735.1572.1063.2353.4973.9221.7592.623.0323.0212.6733.3853.5512.9592.8362.9124.3072.9171.8342.0382.2422.4373.252.1822.3222.9182.771.9852.2892.6392.5282.0711.8361.872.7861.762.2572.4841.3751.8751.813
Percentage of OtherNoninterestExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentsForOriginationAndPurchasesOfLoansHeldForSale

us-gaap:PaymentsForOriginationAndPurchasesOfLoansHeldForSale


None
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
Value1532936310.00.00.00.00.01.2976.65721191863741049.3732.1330.150.00.2210.2840.00.0980.660.3620.423.10832687356500.38931301510277206.944
Percentage of PaymentsForOriginationAndPurchasesOfLoansHeldForSale100.0100.0100.0100.00.00.00.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentsToAcquireAvailableForSaleSecuritiesDebt

us-gaap:PaymentsToAcquireAvailableForSaleSecuritiesDebt


None
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
Value38320764755201210694148.1811.261
Percentage of PaymentsToAcquireAvailableForSaleSecuritiesDebt100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentsToAcquireBusinessesGross

us-gaap:PaymentsToAcquireBusinessesGross


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312015-06-302015-03-312014-06-302014-03-31
Value0.00.03.10.00.0420.00.00.00.0-0.8760.4380.02.792
Percentage of PaymentsToAcquireBusinessesGross0.00.0100.00.00.0100.00.00.00.00.0100.0100.00.0100.0

us-gaap:PaymentsToAcquireBusinessesNetOfCashAcquired

us-gaap:PaymentsToAcquireBusinessesNetOfCashAcquired


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value-261.7120.02.9450.0010.0250.00.00.00.00.00.016-1119.0840.6840.00.0600.00.4380.00.00.02.792
Percentage of PaymentsToAcquireBusinessesNetOfCashAcquired100.00.0100.0100.00.0100.00.00.00.00.00.00.0100.0100.0100.00.00.0100.00.0100.00.00.00.0100.0

us-gaap:ProceedsFromLifeInsurancePolicies

us-gaap:ProceedsFromLifeInsurancePolicies


None
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
Value000431000.002207000.02373000.0357000.0002709000.00
Percentage of ProceedsFromLifeInsurancePolicies0.00.00.0100.00.0100.0100.0100.00.00.0100.00.0

us-gaap:ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities

us-gaap:ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities


None
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
Value838662965131309150376180333051498295967281303754363352586776791068768103874263887487103
Percentage of ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities

us-gaap:ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities


None
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
Value0.790.8250.9191.4451.2531.091.4531.5161.9581.9652.2774.245.6771.7082.6032.5532.6183.926151429126.5213.9473.5623.6434.5717.5039.8341112123614371233434036427.467
Percentage of ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromPrincipalRepaymentsOnLoansAndLeasesHeldForInvestment

us-gaap:ProceedsFromPrincipalRepaymentsOnLoansAndLeasesHeldForInvestment


None
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
Value1108787986929709649689714697624654656744601823667639542568581431419434453444398454507485477539469475427477468414405477418383368
Percentage of ProceedsFromPrincipalRepaymentsOnLoansAndLeasesHeldForInvestment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromSaleOfAvailableForSaleSecuritiesDebt

us-gaap:ProceedsFromSaleOfAvailableForSaleSecuritiesDebt


None
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
Value0.00.00.00.00.07320.00.00.05.206134.023
Percentage of ProceedsFromSaleOfAvailableForSaleSecuritiesDebt0.00.00.00.0100.0100.00.00.00.0100.0100.0100.0

us-gaap:ProceedsFromSaleOfFederalHomeLoanBankStock

us-gaap:ProceedsFromSaleOfFederalHomeLoanBankStock


None
Period End2020-06-302020-03-312019-06-302019-03-312018-06-302018-03-31
Value704000.01609000.0-2433000.03555000.0-193000.04039000.0
Percentage of ProceedsFromSaleOfFederalHomeLoanBankStock100.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromSaleOfForeclosedAssets

us-gaap:ProceedsFromSaleOfForeclosedAssets


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value0.4260.1680.9240.7941.4021.0781.230.6671.7972.6180.6551.3151.1551.2171.5560.5682.7613.2283.434.8272.9752.7291.6142.8982.8382.8663.9025.1654.2694.72.9044.8163.0663.2633.6872.3671.7282.866
Percentage of ProceedsFromSaleOfForeclosedAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromSaleOfLoansHeldForInvestment

us-gaap:ProceedsFromSaleOfLoansHeldForInvestment


None
Period End2020-06-302020-03-312019-06-302019-03-31
Value0.0500.00.0
Percentage of ProceedsFromSaleOfLoansHeldForInvestment0.0100.00.00.0

us-gaap:ProceedsFromSaleOfLoansHeldForSale

us-gaap:ProceedsFromSaleOfLoansHeldForSale


None
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
Value1313238230.00.00.00.00.04.5015.0623010268484730.4322.1390.1510.00.2240.2920.00.1160.9070.1420.7356.66345687358360.36738262310980122.785
Percentage of ProceedsFromSaleOfLoansHeldForSale100.0100.0100.0100.00.00.00.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromSaleOfRealEstateHeldforinvestment

us-gaap:ProceedsFromSaleOfRealEstateHeldforinvestment


None
Period End2020-06-302020-03-312019-06-302019-03-31
Value151000.0152000.0152000.0152000.0
Percentage of ProceedsFromSaleOfRealEstateHeldforinvestment100.0100.0100.0100.0

us-gaap:ProceedsFromStockOptionsExercised

us-gaap:ProceedsFromStockOptionsExercised


None
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
Value0.0011.0052.9440.7581.3674.6580.5881.923.3152.3671.3851.0341.2763.3064.451.8233.2661.3171.4620.7740.6321.4351.5790.4772.1692.2941.0572.661.6831.2180.2380.8980.2090.7860.6910.5990.3870.3530.2310.20.8390.329
Percentage of ProceedsFromStockOptionsExercised100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProfessionalFees

us-gaap:ProfessionalFees


None
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
Value2.8252.8123.5333.0323.1982.5243.1342.3682.8192.2772.9452.3212.4522.5752.0881.8152.1291.8331.9331.5291.6521.7921.971.8541.7752.0622.0441.3311.1991.6931.8691.9391.51.6971.4411.2381.2891.2560.2911.1260.5830.728
Percentage of ProfessionalFees100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProvisionForLoanAndLeaseLosses

us-gaap:ProvisionForLoanAndLeaseLosses


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value51278.2233.3024.6676.4673.7926.9825.3494.2096.5253.0275.5624.6372.1455.5384.1991.664.5953.1671.050.91.0783.4668.2857.4850.9644.9925.4057.1588.1736.9154.9636.287108.0578.3677.244139.8717.8968.801149.83115.781
Percentage of ProvisionForLoanAndLeaseLosses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProvisionForLoanLeaseAndOtherLosses

us-gaap:ProvisionForLoanLeaseAndOtherLosses


None
Period End2020-06-302020-03-312019-06-302019-03-31
Value51274.6676.467
Percentage of ProvisionForLoanLeaseAndOtherLosses100.0100.0100.0100.0

us-gaap:ProvisionForLoanLeaseAndOtherLosses us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType

nwbi:OffBalanceSheetExposure


None
Period End2020-06-302020-03-31
Value5.4791.48
Percentage of ProvisionForLoanLeaseAndOtherLosses10.65.4

us-gaap:ProvisionForLoanLeaseAndOtherLosses us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType, us-gaap:FinancingReceivablePortfolioSegment

nwbi:OffBalanceSheetExposure, nwbi:BusinessBanking


None
Period End2020-06-302020-03-31
Value5.4751.476
Percentage of ProvisionForLoanLeaseAndOtherLosses10.65.3

us-gaap:ProvisionForLoanLeaseAndOtherLosses us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable

nwbi:OffBalanceSheetExposure, nwbi:BusinessBanking, nwbi:CommercialRealEstateOwnerOccupied


None
Period End2020-06-302020-03-31
Value0.5310.004
Percentage of ProvisionForLoanLeaseAndOtherLosses1.00.0

nwbi:OffBalanceSheetExposure, nwbi:BusinessBanking, us-gaap:CommercialLoan


None
Period End2020-06-302020-03-31
Value3.1030.189
Percentage of ProvisionForLoanLeaseAndOtherLosses6.00.7

nwbi:OffBalanceSheetExposure, nwbi:BusinessBanking, us-gaap:CommercialRealEstate


None
Period End2020-06-302020-03-31
Value1.8411.283
Percentage of ProvisionForLoanLeaseAndOtherLosses3.64.6

us-gaap:ProvisionForLoanLeaseAndOtherLosses us-gaap:FinancingReceivablePortfolioSegment

nwbi:BusinessBanking


None
Period End2020-06-302020-03-31
Value5116
Percentage of ProvisionForLoanLeaseAndOtherLosses98.961.4

nwbi:PersonalBanking


None
Period End2020-06-302020-03-31
Value0.58810
Percentage of ProvisionForLoanLeaseAndOtherLosses1.138.6

us-gaap:ProvisionForLoanLeaseAndOtherLosses us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable

nwbi:BusinessBanking, nwbi:CommercialRealEstateOwnerOccupied


None
Period End2020-06-302020-03-31
Value5.4821.365
Percentage of ProvisionForLoanLeaseAndOtherLosses10.64.9

nwbi:BusinessBanking, us-gaap:CommercialLoan


None
Period End2020-06-302020-03-31
Value7.7114.337
Percentage of ProvisionForLoanLeaseAndOtherLosses14.915.7

nwbi:BusinessBanking, us-gaap:CommercialRealEstate


None
Period End2020-06-302020-03-31
Value3711
Percentage of ProvisionForLoanLeaseAndOtherLosses73.440.8

nwbi:PersonalBanking, us-gaap:AutomobileLoan


None
Period End2020-06-302020-03-31
Value2.9495.359
Percentage of ProvisionForLoanLeaseAndOtherLosses5.719.4

nwbi:PersonalBanking, us-gaap:ConsumerLoan


None
Period End2020-06-302020-03-31
Value-1.7893.518
Percentage of ProvisionForLoanLeaseAndOtherLosses-3.512.7

nwbi:PersonalBanking, us-gaap:HomeEquityLoan


None
Period End2020-06-302020-03-31
Value-0.5420.895
Percentage of ProvisionForLoanLeaseAndOtherLosses-1.03.2

nwbi:PersonalBanking, us-gaap:ResidentialMortgage


None
Period End2020-06-302020-03-31
Value-0.030.894
Percentage of ProvisionForLoanLeaseAndOtherLosses-0.13.2

us-gaap:ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent

us-gaap:ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value-214000.0-286000.0-207000.0-207000.0-208000.0-209000.0-208000.0-182000.0-151000.0-200000.0453000.0-165000.0-209000.0
Percentage of ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent us-gaap:StatementEquityComponents

us-gaap:AccumulatedDefinedBenefitPlansAdjustment


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value-249000.0-249000.0-209000.0-208000.0-209000.0-209000.0-225000.0-226000.0-226000.0-226000.0-220000.0-221000.0-221000.0-220000.0-197000.0-224000.0-226000.0-225000.0-218000.0-219000.0-219000.0-219000.0
Percentage of ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent116.487.1101.0100.5100.5100.0108.2124.2149.7113.00.0-48.8133.9105.30.00.00.00.00.00.00.00.0

us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value35000.0-37000.02000.01000.01000.0017000.044000.075000.026000.01585000.0674000.056000.011000.0205000.036000.0-22000.0-28000.0-16000.0120000.0279000.068000.0
Percentage of ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent-16.412.9-1.0-0.5-0.5-0.0-8.2-24.2-49.7-13.00.0148.8-33.9-5.30.00.00.00.00.00.00.00.0

us-gaap:RepaymentsOfShortTermDebt

us-gaap:RepaymentsOfShortTermDebt


None
Period End2020-06-302020-03-312019-06-302019-03-31
Value-47.99954-57.596120
Percentage of RepaymentsOfShortTermDebt100.0100.0100.0100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod us-gaap:TitleOfIndividual

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod

nwbi:Employees


None
Period End2020-05-202019-05-22
Value556480.0547410.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod100.0100.0

srt:Director


None
Period End2020-05-202019-05-22
Value57600.064800.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod10.411.8

us-gaap:StockGrantedDuringPeriodValueSharebasedCompensationForfeited

us-gaap:StockGrantedDuringPeriodValueSharebasedCompensationForfeited


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value001000.00000000
Percentage of StockGrantedDuringPeriodValueSharebasedCompensationForfeited0.00.0100.00.00.00.00.00.00.00.0

us-gaap:StockIssued1

us-gaap:StockIssued1


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value2130.00.00.00.0430.00.00.00.0
Percentage of StockIssued1100.00.00.00.00.0100.00.00.00.00.0

us-gaap:StockIssuedDuringPeriodSharesAcquisitions us-gaap:BusinessAcquisition

us-gaap:StockIssuedDuringPeriodSharesAcquisitions

nwbi:MutualFirstFinancialInc.


None
Period End2020-04-24
Value20
Percentage of StockIssuedDuringPeriodSharesAcquisitions100.0

us-gaap:StockIssuedDuringPeriodSharesAcquisitions us-gaap:StatementEquityComponents

us-gaap:CommonStock


None
Period End2020-06-302019-09-302019-06-302019-03-312015-09-30
Value200.00.02.4623737.056704
Percentage of StockIssuedDuringPeriodSharesAcquisitions0.00.00.00.00.0

us-gaap:StockIssuedDuringPeriodSharesShareBasedCompensation us-gaap:StatementEquityComponents

us-gaap:StockIssuedDuringPeriodSharesShareBasedCompensation

us-gaap:CommonStock


None
Period End2020-06-302019-09-302019-06-302018-09-302018-06-302017-09-302017-06-30
Value282690.00281100.00414330.00378050.0
Percentage of StockIssuedDuringPeriodSharesShareBasedCompensation100.00.0100.00.0100.00.0100.0

us-gaap:StockIssuedDuringPeriodSharesShareBasedCompensationForfeited us-gaap:StatementEquityComponents

us-gaap:StockIssuedDuringPeriodSharesShareBasedCompensationForfeited

us-gaap:CommonStock


None
Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value36731.012910.018407.02596.028155.07519.0182700.0
Percentage of StockIssuedDuringPeriodSharesShareBasedCompensationForfeited100.0100.0100.0100.0100.0100.0100.0

us-gaap:StockIssuedDuringPeriodSharesStockOptionsExercised us-gaap:StatementEquityComponents

us-gaap:StockIssuedDuringPeriodSharesStockOptionsExercised

us-gaap:CommonStock


None
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
Value087305.061867.0116070.0431780.0178110.0291600.0204830.087521.0112150.0288540.0162280.0300720.0122670.075159.060849.0149900.045124.0212640.0220720.0274200.0174990.0149380.0147290.024101.0100350.0145490.072230.056738.031404.094052.039104.0
Percentage of StockIssuedDuringPeriodSharesStockOptionsExercised0.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StockIssuedDuringPeriodValueAcquisitions

us-gaap:StockIssuedDuringPeriodValueAcquisitions


None
Period End2020-06-302019-12-312019-09-302019-06-302019-03-312015-12-312015-09-30
Value2130.00.00.0430.090
Percentage of StockIssuedDuringPeriodValueAcquisitions100.00.00.00.0100.00.0100.0

us-gaap:StockIssuedDuringPeriodValueAcquisitions us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital


None
Period End2020-06-302019-12-312019-09-302019-06-302019-03-312015-12-312015-09-30
Value2130.00.00.0430.090
Percentage of StockIssuedDuringPeriodValueAcquisitions99.90.00.00.099.90.099.9

us-gaap:CommonStock


None
Period End2020-06-302019-12-312019-09-302019-06-302019-03-312015-12-312015-09-30
Value0.2060.00.00.00.0240.00.07
Percentage of StockIssuedDuringPeriodValueAcquisitions0.10.00.00.00.10.00.1

us-gaap:RetainedEarnings


None
Period End2020-06-30
Value0.0
Percentage of StockIssuedDuringPeriodValueAcquisitions0.0

us-gaap:StockIssuedDuringPeriodValueStockOptionsExercised

us-gaap:StockIssuedDuringPeriodValueStockOptionsExercised


None
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
Value0.0011.0052.9440.7571.3674.6580.5891.923.3152.3671.3851.0341.2763.3064.451.8233.2661.3171.4620.7740.6321.4351.5790.4772.1692.2941.0572.661.6831.2180.2380.8980.2090.7860.6910.5990.3870.3530.2030.2280.8390.329
Percentage of StockIssuedDuringPeriodValueStockOptionsExercised100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StockIssuedDuringPeriodValueStockOptionsExercised us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital


None
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
Value0.01.0052.9410.7561.3664.6540.5881.9183.3122.3651.3841.0331.2753.3034.4461.8213.2621.3161.460.7730.6321.4331.5780.4762.1672.2921.0562.6571.6811.2170.2370.8970.2090.7850.6910.5980.3860.3520.2030.2280.8380.328
Percentage of StockIssuedDuringPeriodValueStockOptionsExercised0.0100.099.999.999.999.999.899.999.999.999.999.999.999.999.999.999.999.999.999.9100.099.999.999.899.999.999.999.999.999.999.699.9100.099.9100.099.899.799.7100.0100.099.999.7

us-gaap:WeightedAverageNumberDilutedSharesOutstandingAdjustment

us-gaap:WeightedAverageNumberDilutedSharesOutstandingAdjustment


None
Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-30
Value0265690.0752840.01024600.01394800.01607700.01554100.01537600.01400900.01498900.01827300.01465700.01065800.0490260.0568990.0459830.0268010.0372640.01039500.01198300.01064000.0493420.0474990.0187780.0205920.0549810.0206310.0319310.0687060.0573500.0732660.0
Percentage of WeightedAverageNumberDilutedSharesOutstandingAdjustment0.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

nwbi:AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsGrossUnrealizedGain us-gaap:FinancialInstrument

nwbi:AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsGrossUnrealizedGain

us-gaap:USGovernmentSponsoredEnterprisesDebtSecurities


None
Period End2020-06-30
Value134000.0
Percentage of AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsGrossUnrealizedGain100.0

us-gaap:USStatesAndPoliticalSubdivisions


None
Period End2020-06-302019-12-31
Value228000.0148000.0
Percentage of AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsGrossUnrealizedGain170.10.0

nwbi:AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsGrossUnrealizedLoss us-gaap:FinancialInstrument

nwbi:AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsGrossUnrealizedLoss

us-gaap:USGovernmentSponsoredEnterprisesDebtSecurities


None
Period End2020-06-30
Value93000.0
Percentage of AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsGrossUnrealizedLoss100.0

nwbi:AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsGrossUnrealizedGain us-gaap:FinancialInstrument

nwbi:AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsGrossUnrealizedGain

us-gaap:USGovernmentSponsoredEnterprisesDebtSecurities


None
Period End2020-06-302019-12-31
Value292000.00
Percentage of AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsGrossUnrealizedGain100.00.0

us-gaap:USStatesAndPoliticalSubdivisions


None
Period End2020-06-302019-12-31
Value95000.079000.0
Percentage of AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsGrossUnrealizedGain32.50.0

nwbi:AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsGrossUnrealizedLoss us-gaap:FinancialInstrument

nwbi:AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsGrossUnrealizedLoss

us-gaap:USGovernmentSponsoredEnterprisesDebtSecurities


None
Period End2020-06-302019-12-31
Value0227000.0
Percentage of AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsGrossUnrealizedLoss0.0100.0

us-gaap:USStatesAndPoliticalSubdivisions


None
Period End2020-06-302019-12-31
Value3000.00
Percentage of AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsGrossUnrealizedLoss0.00.0

nwbi:AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsGrossUnrealizedGain us-gaap:FinancialInstrument

nwbi:AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsGrossUnrealizedGain

us-gaap:USGovernmentAgenciesDebtSecurities


None
Period End2020-06-30
Value112000.0
Percentage of AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsGrossUnrealizedGain100.0

us-gaap:USStatesAndPoliticalSubdivisions


None
Period End2020-06-302019-12-31
Value2785000.0267000.0
Percentage of AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsGrossUnrealizedGain2486.60.0

nwbi:AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsGrossUnrealizedLoss us-gaap:FinancialInstrument

nwbi:AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsGrossUnrealizedLoss

us-gaap:USGovernmentAgenciesDebtSecurities


None
Period End2020-06-30
Value0
Percentage of AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsGrossUnrealizedLoss0.0

us-gaap:USStatesAndPoliticalSubdivisions


None
Period End2020-06-302019-12-31
Value7000.00
Percentage of AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsGrossUnrealizedLoss0.00.0

nwbi:AvailableForSaleSecuritiesDebtMaturitiesOneYearOrLessGrossUnrealizedLoss us-gaap:FinancialInstrument

nwbi:AvailableForSaleSecuritiesDebtMaturitiesOneYearOrLessGrossUnrealizedLoss

us-gaap:USGovernmentSponsoredEnterprisesDebtSecurities


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value0006000.0165000.0457000.0795000.0895000.0238000.0289000.0
Percentage of AvailableForSaleSecuritiesDebtMaturitiesOneYearOrLessGrossUnrealizedLoss0.00.00.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:USStatesAndPoliticalSubdivisions


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value0000006000.07000.001000.0
Percentage of AvailableForSaleSecuritiesDebtMaturitiesOneYearOrLessGrossUnrealizedLoss0.00.00.00.00.00.00.80.80.00.3

nwbi:AvailableforsaleSecuritiesDebtMaturitiesafterFiveThroughTenYearsGrossUnrealizedGain us-gaap:FinancialInstrument

nwbi:AvailableforsaleSecuritiesDebtMaturitiesafterFiveThroughTenYearsGrossUnrealizedGain

us-gaap:USGovernmentSponsoredEnterprisesDebtSecurities


None
Period End2020-03-312019-12-312019-09-302019-06-302019-03-312017-12-31
Value114000.053000.066000.044000.015000.00
Percentage of AvailableforsaleSecuritiesDebtMaturitiesafterFiveThroughTenYearsGrossUnrealizedGain100.0100.0100.0100.0100.00.0

us-gaap:USStatesAndPoliticalSubdivisions


None
Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value178000.0148000.0154000.0150000.0100000.060000.046000.075000.0171000.0
Percentage of AvailableforsaleSecuritiesDebtMaturitiesafterFiveThroughTenYearsGrossUnrealizedGain156.1279.2233.3340.9666.70.00.00.00.0

nwbi:AvailableforsaleSecuritiesDebtMaturitiesafterFiveThroughTenYearsGrossUnrealizedLoss us-gaap:FinancialInstrument

nwbi:AvailableforsaleSecuritiesDebtMaturitiesafterFiveThroughTenYearsGrossUnrealizedLoss

us-gaap:USGovernmentSponsoredEnterprisesDebtSecurities


None
Period End2020-03-312019-12-312019-09-302019-06-302019-03-312017-12-31
Value103000.0109000.0114000.0123000.000
Percentage of AvailableforsaleSecuritiesDebtMaturitiesafterFiveThroughTenYearsGrossUnrealizedLoss100.0100.0100.0100.00.00.0

us-gaap:USStatesAndPoliticalSubdivisions


None
Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value0001000.00023000.014000.00
Percentage of AvailableforsaleSecuritiesDebtMaturitiesafterFiveThroughTenYearsGrossUnrealizedLoss0.00.00.00.80.00.00.00.00.0

nwbi:AvailableforsaleSecuritiesDebtMaturitiesafterOneThroughFiveYearsGrossUnrealizedGain us-gaap:FinancialInstrument

nwbi:AvailableforsaleSecuritiesDebtMaturitiesafterOneThroughFiveYearsGrossUnrealizedGain

us-gaap:USGovernmentSponsoredEnterprisesDebtSecurities


None
Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value284000.00116000.0344000.0204000.071000.006000.00
Percentage of AvailableforsaleSecuritiesDebtMaturitiesafterOneThroughFiveYearsGrossUnrealizedGain100.00.0100.0100.0100.0100.00.0100.00.0

us-gaap:USStatesAndPoliticalSubdivisions


None
Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value68000.079000.081000.084000.073000.054000.043000.057000.082000.0
Percentage of AvailableforsaleSecuritiesDebtMaturitiesafterOneThroughFiveYearsGrossUnrealizedGain23.90.069.824.435.876.10.0950.00.0

nwbi:AvailableforsaleSecuritiesDebtMaturitiesafterOneThroughFiveYearsGrossUnrealizedLoss us-gaap:FinancialInstrument

nwbi:AvailableforsaleSecuritiesDebtMaturitiesafterOneThroughFiveYearsGrossUnrealizedLoss

us-gaap:USGovernmentSponsoredEnterprisesDebtSecurities


None
Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value0227000.0340000.0511000.01104000.01512000.02560000.03136000.02402000.0
Percentage of AvailableforsaleSecuritiesDebtMaturitiesafterOneThroughFiveYearsGrossUnrealizedLoss0.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:USStatesAndPoliticalSubdivisions


None
Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value000004000.011000.08000.06000.0
Percentage of AvailableforsaleSecuritiesDebtMaturitiesafterOneThroughFiveYearsGrossUnrealizedLoss0.00.00.00.00.00.30.40.30.2

nwbi:AvailableforsaleSecuritiesDebtMaturitiesafterTenYearsGrossUnrealizedGain us-gaap:FinancialInstrument

nwbi:AvailableforsaleSecuritiesDebtMaturitiesafterTenYearsGrossUnrealizedGain

us-gaap:USStatesAndPoliticalSubdivisions


None
Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value436000.0267000.0317000.0263000.087000.031000.031000.051000.0292000.0
Percentage of AvailableforsaleSecuritiesDebtMaturitiesafterTenYearsGrossUnrealizedGain100.0100.0100.0100.0100.0100.0100.0100.0100.0

nwbi:AvailableforsaleSecuritiesDebtMaturitiesafterTenYearsGrossUnrealizedLoss us-gaap:FinancialInstrument

nwbi:AvailableforsaleSecuritiesDebtMaturitiesafterTenYearsGrossUnrealizedLoss

us-gaap:USStatesAndPoliticalSubdivisions


None
Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value00000029000.012000.00
Percentage of AvailableforsaleSecuritiesDebtMaturitiesafterTenYearsGrossUnrealizedLoss0.00.00.00.00.00.0100.0100.00.0

nwbi:AvailableforsaleSecuritiesDebtMaturitieswithinOneYearGrossUnrealizedGain us-gaap:FinancialInstrument

nwbi:AvailableforsaleSecuritiesDebtMaturitieswithinOneYearGrossUnrealizedGain

us-gaap:USGovernmentSponsoredEnterprisesDebtSecurities


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value228000.0475000.0345000.0260000.092000.0000014000.0
Percentage of AvailableforsaleSecuritiesDebtMaturitieswithinOneYearGrossUnrealizedGain100.0100.0100.0100.0100.00.00.00.00.0100.0

us-gaap:USStatesAndPoliticalSubdivisions


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value5000.03000.04000.01000.03000.02000.02000.03000.05000.07000.0
Percentage of AvailableforsaleSecuritiesDebtMaturitieswithinOneYearGrossUnrealizedGain2.20.61.20.43.30.00.00.00.050.0

nwbi:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLoansReceivable us-gaap:BusinessAcquisition

nwbi:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLoansReceivable

nwbi:MutualFirstFinancialInc.


None
Period End2020-04-24
Value1508
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLoansReceivable100.0

nwbi:CashCashEquivalentsAndMarketableSecurities

nwbi:CashCashEquivalentsAndMarketableSecurities


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-31
Value20521059898934982957893909958977899106711451349123612331041975107311191215130412561334147715891530163417261840168517571802189518281911203420662027
Percentage of CashCashEquivalentsAndMarketableSecurities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

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

nwbi:CollateralizedMortgageBackedSecuritiesAvailableForSale

us-gaap:FairValueInputsLevel1, us-gaap:FairValueMeasurementsRecurring, nwbi:MortgageBackedSecuritiesSmallBusinessAdministrationSBA


None
Period End2020-06-30
Value0.0
Percentage of CollateralizedMortgageBackedSecuritiesAvailableForSale0.0

us-gaap:FairValueInputsLevel1, us-gaap:FairValueMeasurementsRecurring, us-gaap:MortgageBackedSecuritiesIssuedByPrivateEnterprises


None
Period End2020-06-30
Value0.0
Percentage of CollateralizedMortgageBackedSecuritiesAvailableForSale0.0

us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring, us-gaap:FederalHomeLoanMortgageCorporationCertificatesAndObligationsFHLMC


None
Period End2020-06-302019-12-31
Value131118
Percentage of CollateralizedMortgageBackedSecuritiesAvailableForSale0.00.0

us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring, us-gaap:FederalNationalMortgageAssociationCertificatesAndObligationsFNMA


None
Period End2020-06-302019-12-31
Value273184
Percentage of CollateralizedMortgageBackedSecuritiesAvailableForSale0.00.0

us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring, us-gaap:GovernmentNationalMortgageAssociationCertificatesAndObligationsGNMA


None
Period End2020-06-302019-12-31
Value259207
Percentage of CollateralizedMortgageBackedSecuritiesAvailableForSale0.00.0

us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring, us-gaap:MortgageBackedSecuritiesIssuedByPrivateEnterprises


None
Period End2020-06-30
Value0.0
Percentage of CollateralizedMortgageBackedSecuritiesAvailableForSale0.0

us-gaap:FairValueInputsLevel3, us-gaap:FairValueMeasurementsRecurring, nwbi:MortgageBackedSecuritiesSmallBusinessAdministrationSBA


None
Period End2020-06-30
Value0.0
Percentage of CollateralizedMortgageBackedSecuritiesAvailableForSale0.0

us-gaap:FairValueInputsLevel3, us-gaap:FairValueMeasurementsRecurring, us-gaap:MortgageBackedSecuritiesIssuedByPrivateEnterprises


None
Period End2020-06-30
Value0.0
Percentage of CollateralizedMortgageBackedSecuritiesAvailableForSale0.0

nwbi:CollateralizedMortgageBackedSecuritiesAvailableForSale us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument

us-gaap:FairValueMeasurementsRecurring, nwbi:MortgageBackedSecuritiesSmallBusinessAdministrationSBA


None
Period End2020-06-30
Value0.0
Percentage of CollateralizedMortgageBackedSecuritiesAvailableForSale0.0

us-gaap:FairValueMeasurementsRecurring, us-gaap:FederalHomeLoanMortgageCorporationCertificatesAndObligationsFHLMC


None
Period End2020-06-302019-12-31
Value131118
Percentage of CollateralizedMortgageBackedSecuritiesAvailableForSale0.00.0

us-gaap:FairValueMeasurementsRecurring, us-gaap:FederalNationalMortgageAssociationCertificatesAndObligationsFNMA


None
Period End2020-06-302019-12-31
Value273184
Percentage of CollateralizedMortgageBackedSecuritiesAvailableForSale0.00.0

us-gaap:FairValueMeasurementsRecurring, us-gaap:GovernmentNationalMortgageAssociationCertificatesAndObligationsGNMA


None
Period End2020-06-302019-12-31
Value259207
Percentage of CollateralizedMortgageBackedSecuritiesAvailableForSale0.00.0

us-gaap:FairValueMeasurementsRecurring, us-gaap:MortgageBackedSecuritiesIssuedByPrivateEnterprises


None
Period End2020-06-30
Value0.0
Percentage of CollateralizedMortgageBackedSecuritiesAvailableForSale0.0

nwbi:DebtSecuritiesAvailableForSaleAccruedInterestReceivable

nwbi:DebtSecuritiesAvailableForSaleAccruedInterestReceivable


None
Period End2020-06-302020-03-312019-12-31
Value1800000.01000000.0900000.0
Percentage of DebtSecuritiesAvailableForSaleAccruedInterestReceivable100.0100.0100.0

nwbi:DebtSecuritiesHeldToMaturityAccruedInterestReceivable

nwbi:DebtSecuritiesHeldToMaturityAccruedInterestReceivable


None
Period End2020-06-302020-03-312019-12-31
Value1500000.01300000.01500000.0
Percentage of DebtSecuritiesHeldToMaturityAccruedInterestReceivable100.0100.0100.0

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

nwbi:DerivativeEffectiveInterestRate

nwbi:InterestRateSwapIssuedMarch162020, us-gaap:CashFlowHedging, us-gaap:DesignatedAsHedgingInstrument


None
Period End2020-06-302020-03-31
Value0.00320.0081
Percentage of DerivativeEffectiveInterestRate100.0100.0

nwbi:InterestRateSwapIssuedMarch202020ContractOne, us-gaap:CashFlowHedging, us-gaap:DesignatedAsHedgingInstrument


None
Period End2020-06-302020-03-31
Value0.00260.0015
Percentage of DerivativeEffectiveInterestRate81.218.5

nwbi:InterestRateSwapIssuedMarch202020ContractTwo, us-gaap:CashFlowHedging, us-gaap:DesignatedAsHedgingInstrument


None
Period End2020-06-302020-03-31
Value0.00290.0018
Percentage of DerivativeEffectiveInterestRate90.622.2

nwbi:InterestRateSwapIssuedMarch262020, us-gaap:CashFlowHedging, us-gaap:DesignatedAsHedgingInstrument


None
Period End2020-06-302020-03-31
Value0.0029-0.0007
Percentage of DerivativeEffectiveInterestRate90.6-8.6

nwbi:FinancingReceivableAccruedInterestReceivable

nwbi:FinancingReceivableAccruedInterestReceivable


None
Period End2020-06-302020-03-312019-12-31
Value362323
Percentage of FinancingReceivableAccruedInterestReceivable100.0100.0100.0

nwbi:FinancingReceivableAllowanceForCreditLossModifications

nwbi:FinancingReceivableAllowanceForCreditLossModifications


None
Period End2020-06-302020-03-312019-12-312018-12-31
Value3644000.04948000.03002000.03089000.0
Percentage of FinancingReceivableAllowanceForCreditLossModifications100.0100.0100.0100.0

nwbi:FinancingReceivableAllowanceForCreditLossModifications us-gaap:FinancingReceivablePortfolioSegment

nwbi:BusinessBanking


None
Period End2020-06-302020-03-312019-12-312018-12-31
Value2052000.03616000.02049000.0576000.0
Percentage of FinancingReceivableAllowanceForCreditLossModifications56.373.168.318.6

nwbi:PersonalBanking


None
Period End2020-06-302020-03-312019-12-312018-12-31
Value1592000.01332000.0953000.02513000.0
Percentage of FinancingReceivableAllowanceForCreditLossModifications43.726.931.781.4

nwbi:FinancingReceivableAllowanceForCreditLossModifications us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable

nwbi:BusinessBanking, nwbi:CommercialRealEstateOwnerOccupied


None
Period End2020-06-302020-03-31
Value603000.0625000.0
Percentage of FinancingReceivableAllowanceForCreditLossModifications16.512.6

nwbi:BusinessBanking, us-gaap:CommercialLoan


None
Period End2020-06-302020-03-312019-12-312018-12-31
Value308000.01981000.0665000.0263000.0
Percentage of FinancingReceivableAllowanceForCreditLossModifications8.540.022.28.5

nwbi:BusinessBanking, us-gaap:CommercialRealEstate


None
Period End2020-06-302020-03-312019-12-31
Value1141000.01010000.01384000.0
Percentage of FinancingReceivableAllowanceForCreditLossModifications31.320.446.1

nwbi:PersonalBanking, us-gaap:HomeEquityLoan


None
Period End2020-06-302020-03-312019-12-312018-12-31
Value612000.0467000.0393000.01520000.0
Percentage of FinancingReceivableAllowanceForCreditLossModifications16.89.413.149.2

nwbi:PersonalBanking, us-gaap:ResidentialMortgage


None
Period End2020-06-302020-03-312019-12-312018-12-31
Value980000.0865000.0560000.0993000.0
Percentage of FinancingReceivableAllowanceForCreditLossModifications26.917.518.732.1

nwbi:FinancingReceivableAmortizedCostOfCollateralDependentLoans

nwbi:FinancingReceivableAmortizedCostOfCollateralDependentLoans


None
Period End2020-06-302020-03-31
Value4943
Percentage of FinancingReceivableAmortizedCostOfCollateralDependentLoans100.0100.0

nwbi:FinancingReceivableAmortizedCostOfCollateralDependentLoans us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType

nwbi:EquipmentCollateralDependentLoans


None
Period End2020-06-302020-03-31
Value2.98311
Percentage of FinancingReceivableAmortizedCostOfCollateralDependentLoans6.026.8

nwbi:OtherCollateralDependentLoans


None
Period End2020-06-302020-03-31
Value6.3791.569
Percentage of FinancingReceivableAmortizedCostOfCollateralDependentLoans12.93.6

nwbi:RealEstateCollateralDependentLoans


None
Period End2020-06-302020-03-31
Value4030
Percentage of FinancingReceivableAmortizedCostOfCollateralDependentLoans81.069.6

nwbi:FinancingReceivableAmortizedCostOfCollateralDependentLoans us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType, us-gaap:FinancingReceivablePortfolioSegment

nwbi:EquipmentCollateralDependentLoans, nwbi:BusinessBanking


None
Period End2020-06-302020-03-31
Value2.98311
Percentage of FinancingReceivableAmortizedCostOfCollateralDependentLoans6.026.8

nwbi:OtherCollateralDependentLoans, nwbi:BusinessBanking


None
Period End2020-06-302020-03-31
Value6.3790.0
Percentage of FinancingReceivableAmortizedCostOfCollateralDependentLoans12.90.0

nwbi:OtherCollateralDependentLoans, nwbi:PersonalBanking


None
Period End2020-06-302020-03-31
Value0.01.569
Percentage of FinancingReceivableAmortizedCostOfCollateralDependentLoans0.03.6

nwbi:RealEstateCollateralDependentLoans, nwbi:BusinessBanking


None
Period End2020-06-302020-03-31
Value3923
Percentage of FinancingReceivableAmortizedCostOfCollateralDependentLoans79.654.1

nwbi:RealEstateCollateralDependentLoans, nwbi:PersonalBanking


None
Period End2020-06-302020-03-31
Value0.6886.776
Percentage of FinancingReceivableAmortizedCostOfCollateralDependentLoans1.415.5

nwbi:FinancingReceivableAmortizedCostOfCollateralDependentLoans us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable

nwbi:EquipmentCollateralDependentLoans, nwbi:BusinessBanking, us-gaap:CommercialLoan


None
Period End2020-06-302020-03-31
Value2.98311
Percentage of FinancingReceivableAmortizedCostOfCollateralDependentLoans6.026.8

nwbi:EquipmentCollateralDependentLoans, nwbi:PersonalBanking, us-gaap:ConsumerLoan


None
Period End2020-03-31
Value0.0
Percentage of FinancingReceivableAmortizedCostOfCollateralDependentLoans0.0

nwbi:OtherCollateralDependentLoans, nwbi:BusinessBanking, nwbi:CommercialRealEstateOwnerOccupied


None
Period End2020-06-302020-03-31
Value0.9970.0
Percentage of FinancingReceivableAmortizedCostOfCollateralDependentLoans2.00.0

nwbi:OtherCollateralDependentLoans, nwbi:BusinessBanking, us-gaap:CommercialLoan


None
Period End2020-06-302020-03-31
Value4.290.0
Percentage of FinancingReceivableAmortizedCostOfCollateralDependentLoans8.70.0

nwbi:OtherCollateralDependentLoans, nwbi:BusinessBanking, us-gaap:CommercialRealEstate


None
Period End2020-06-302020-03-31
Value1.0920.0
Percentage of FinancingReceivableAmortizedCostOfCollateralDependentLoans2.20.0

nwbi:OtherCollateralDependentLoans, nwbi:PersonalBanking, us-gaap:AutomobileLoan


None
Period End2020-06-302020-03-31
Value0.01.569
Percentage of FinancingReceivableAmortizedCostOfCollateralDependentLoans0.03.6

nwbi:OtherCollateralDependentLoans, nwbi:PersonalBanking, us-gaap:ConsumerLoan


None
Period End2020-03-31
Value0.0
Percentage of FinancingReceivableAmortizedCostOfCollateralDependentLoans0.0

nwbi:RealEstateCollateralDependentLoans, nwbi:BusinessBanking, nwbi:CommercialRealEstateOwnerOccupied


None
Period End2020-06-302020-03-31
Value8.2045.841
Percentage of FinancingReceivableAmortizedCostOfCollateralDependentLoans16.613.4

nwbi:RealEstateCollateralDependentLoans, nwbi:BusinessBanking, us-gaap:CommercialLoan


None
Period End2020-06-302020-03-31
Value5.3263.927
Percentage of FinancingReceivableAmortizedCostOfCollateralDependentLoans10.89.0

nwbi:RealEstateCollateralDependentLoans, nwbi:BusinessBanking, us-gaap:CommercialRealEstate


None
Period End2020-06-302020-03-31
Value2513
Percentage of FinancingReceivableAmortizedCostOfCollateralDependentLoans52.231.8

nwbi:RealEstateCollateralDependentLoans, nwbi:PersonalBanking, us-gaap:ConsumerLoan


None
Period End2020-03-31
Value0.0
Percentage of FinancingReceivableAmortizedCostOfCollateralDependentLoans0.0

nwbi:RealEstateCollateralDependentLoans, nwbi:PersonalBanking, us-gaap:ResidentialMortgage


None
Period End2020-06-302020-03-31
Value0.5896.677
Percentage of FinancingReceivableAmortizedCostOfCollateralDependentLoans1.215.3

nwbi:FinancingReceivableAmortizedCostOfCollateralDependentLoans us-gaap:FinancingReceivablePortfolioSegment

nwbi:BusinessBanking


None
Period End2020-06-302020-03-31
Value4835
Percentage of FinancingReceivableAmortizedCostOfCollateralDependentLoans98.680.9

nwbi:PersonalBanking


None
Period End2020-06-302020-03-31
Value0.6888.345
Percentage of FinancingReceivableAmortizedCostOfCollateralDependentLoans1.419.1

nwbi:FinancingReceivableAmortizedCostOfCollateralDependentLoans us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable

nwbi:BusinessBanking, nwbi:CommercialRealEstateOwnerOccupied


None
Period End2020-06-302020-03-31
Value9.2015.841
Percentage of FinancingReceivableAmortizedCostOfCollateralDependentLoans18.613.4

nwbi:BusinessBanking, us-gaap:CommercialLoan


None
Period End2020-06-302020-03-31
Value1215
Percentage of FinancingReceivableAmortizedCostOfCollateralDependentLoans25.535.8

nwbi:BusinessBanking, us-gaap:CommercialRealEstate


None
Period End2020-06-302020-03-31
Value2613
Percentage of FinancingReceivableAmortizedCostOfCollateralDependentLoans54.531.8

nwbi:PersonalBanking, us-gaap:AutomobileLoan


None
Period End2020-06-302020-03-31
Value0.01.569
Percentage of FinancingReceivableAmortizedCostOfCollateralDependentLoans0.03.6

nwbi:PersonalBanking, us-gaap:ConsumerLoan


None
Period End2020-03-31
Value0.0
Percentage of FinancingReceivableAmortizedCostOfCollateralDependentLoans0.0

nwbi:PersonalBanking, us-gaap:ResidentialMortgage


None
Period End2020-06-302020-03-31
Value0.5896.677
Percentage of FinancingReceivableAmortizedCostOfCollateralDependentLoans1.215.3

nwbi:FinancingReceivableBeforeAllowanceForCreditLossAndLoansHeldForSale

nwbi:FinancingReceivableBeforeAllowanceForCreditLossAndLoansHeldForSale


None
Period End2020-06-302020-03-312019-12-31
Value1082488308800
Percentage of FinancingReceivableBeforeAllowanceForCreditLossAndLoansHeldForSale100.0100.0100.0

nwbi:FinancingReceivableModificationsOutstandingNumberOfContracts

nwbi:FinancingReceivableModificationsOutstandingNumberOfContracts


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312013-12-31
Value167.0171.0176.0177.0183.0195.0195.0197.0205.0200.0205.0201.0203.0224.0225.0218.0230.0227.0227.0224.0231.0242.0248.0262.0
Percentage of FinancingReceivableModificationsOutstandingNumberOfContracts100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

nwbi:FinancingReceivableModificationsRecordedInvestmentAccrual

nwbi:FinancingReceivableModificationsRecordedInvestmentAccrual


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-30
Value171522211717181919191920232526293130292640403739394050414445485750
Percentage of FinancingReceivableModificationsRecordedInvestmentAccrual100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

nwbi:FinancingReceivableModificationsRecordedInvestmentAdditionalCommitment

nwbi:FinancingReceivableModificationsRecordedInvestmentAdditionalCommitment


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302012-12-31
Value610000.0661000.0566000.0671000.0461000.0528000.0388000.0421000.0205000.0371000.0247000.0279000.0185000.0422000.0438000.0300000.0334000.0465000.0320000.0917000.01024000.02244000.01263000.01319000.01397000.01070000.0755000.01708000.04138000.02987000.0
Percentage of FinancingReceivableModificationsRecordedInvestmentAdditionalCommitment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

nwbi:FinancingReceivableModificationsRecordedInvestmentAdditionalCommitment us-gaap:FinancingReceivablePortfolioSegment

nwbi:BusinessBanking


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312014-12-31
Value584000.0635000.0540000.0645000.0429000.0497000.0384000.0417000.0199000.0366000.0243000.0275000.0180000.0422000.0434000.0297000.0334000.0465000.0320000.01263000.0
Percentage of FinancingReceivableModificationsRecordedInvestmentAdditionalCommitment95.796.195.496.193.194.199.099.097.198.798.498.697.3100.099.199.0100.0100.0100.0100.0

nwbi:PersonalBanking


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312014-12-31
Value26000.026000.026000.026000.032000.031000.04000.04000.06000.05000.04000.04000.05000.004000.03000.00000
Percentage of FinancingReceivableModificationsRecordedInvestmentAdditionalCommitment4.33.94.63.96.95.91.01.02.91.31.61.42.70.00.91.00.00.00.00.0

nwbi:FinancingReceivableModificationsRecordedInvestmentAdditionalCommitment us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable

nwbi:BusinessBanking, nwbi:CommercialRealEstateOwnerOccupied


None
Period End2020-06-302020-03-31
Value285000.05000.0
Percentage of FinancingReceivableModificationsRecordedInvestmentAdditionalCommitment46.70.8

nwbi:BusinessBanking, us-gaap:CommercialLoan


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312014-12-31
Value228000.0559000.064000.0170000.025000.06000.074000.0209000.019000.038000.08000.023000.067000.077000.017000.017000.0131000.081000.079000.0814000.0
Percentage of FinancingReceivableModificationsRecordedInvestmentAdditionalCommitment37.484.611.325.35.41.119.149.69.310.23.28.236.218.23.95.739.217.424.764.4

nwbi:BusinessBanking, us-gaap:CommercialRealEstate


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value71000.071000.0476000.0475000.0404000.0491000.0310000.0208000.0180000.0235000.0
Percentage of FinancingReceivableModificationsRecordedInvestmentAdditionalCommitment11.610.784.170.887.693.079.949.487.895.1

nwbi:PersonalBanking, us-gaap:HomeEquityLoan


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312014-12-31
Value26000.026000.026000.026000.032000.031000.04000.04000.06000.05000.04000.04000.05000.004000.03000.00000
Percentage of FinancingReceivableModificationsRecordedInvestmentAdditionalCommitment4.33.94.63.96.95.91.01.02.91.31.61.42.70.00.91.00.00.00.00.0

nwbi:FinancingReceivableModificationsRecordedInvestmentNonAccrual

nwbi:FinancingReceivableModificationsRecordedInvestmentNonAccrual


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-30
Value17179.09.11315159.77710111217171816171817212315192421233428374246412928
Percentage of FinancingReceivableModificationsRecordedInvestmentNonAccrual100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

nwbi:FinancingReceivableNonaccrualIncludingNonaccrualWithNoAllowance

nwbi:FinancingReceivableNonaccrualIncludingNonaccrualWithNoAllowance


None
Period End2020-06-302020-03-31
Value11585
Percentage of FinancingReceivableNonaccrualIncludingNonaccrualWithNoAllowance100.0100.0

nwbi:FinancingReceivableNonaccrualIncludingNonaccrualWithNoAllowance us-gaap:FinancingReceivablePortfolioSegment

nwbi:BusinessBanking


None
Period End2020-06-302020-03-31
Value8162
Percentage of FinancingReceivableNonaccrualIncludingNonaccrualWithNoAllowance70.873.2

nwbi:PersonalBanking


None
Period End2020-06-302020-03-31
Value3322
Percentage of FinancingReceivableNonaccrualIncludingNonaccrualWithNoAllowance29.226.8

nwbi:FinancingReceivableNonaccrualIncludingNonaccrualWithNoAllowance us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable

nwbi:BusinessBanking, nwbi:CommercialRealEstateOwnerOccupied


None
Period End2020-06-302020-03-31
Value1915
Percentage of FinancingReceivableNonaccrualIncludingNonaccrualWithNoAllowance16.518.6

nwbi:BusinessBanking, us-gaap:CommercialLoan


None
Period End2020-06-302020-03-31
Value1820
Percentage of FinancingReceivableNonaccrualIncludingNonaccrualWithNoAllowance16.323.7

nwbi:BusinessBanking, us-gaap:CommercialRealEstate


None
Period End2020-06-302020-03-31
Value4326
Percentage of FinancingReceivableNonaccrualIncludingNonaccrualWithNoAllowance38.030.9

nwbi:PersonalBanking, nwbi:ConsumerFinanceLoans


None
Period End2020-06-302020-03-31
Value6.1343.231
Percentage of FinancingReceivableNonaccrualIncludingNonaccrualWithNoAllowance5.33.8

nwbi:PersonalBanking, us-gaap:ConsumerLoan


None
Period End2020-06-302020-03-31
Value1.9770.936
Percentage of FinancingReceivableNonaccrualIncludingNonaccrualWithNoAllowance1.71.1

nwbi:PersonalBanking, us-gaap:HomeEquityLoan


None
Period End2020-06-302020-03-31
Value8.7487.106
Percentage of FinancingReceivableNonaccrualIncludingNonaccrualWithNoAllowance7.68.3

nwbi:PersonalBanking, us-gaap:ResidentialMortgage


None
Period End2020-06-302020-03-31
Value1611
Percentage of FinancingReceivableNonaccrualIncludingNonaccrualWithNoAllowance14.613.6

nwbi:FinancingReceivableRecordedInvestment90DaysOrMorePastMaturityAndStillAccruing

nwbi:FinancingReceivableRecordedInvestment90DaysOrMorePastMaturityAndStillAccruing


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312014-12-31
Value77000.031000.032000.085000.055000.0166000.0166000.0195000.094000.0210000.0502000.0398000.0182000.0265000.0649000.0103000.0472000.0894000.01334000.0235000.0
Percentage of FinancingReceivableRecordedInvestment90DaysOrMorePastMaturityAndStillAccruing100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

nwbi:FinancingReceivableRecordedInvestment90DaysOrMorePastMaturityAndStillAccruing us-gaap:FinancingReceivablePortfolioSegment

nwbi:BusinessBanking


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312014-12-31
Value0000000000009000.00564000.08000.0299000.0124000.0354000.021000.0
Percentage of FinancingReceivableRecordedInvestment90DaysOrMorePastMaturityAndStillAccruing0.00.00.00.00.00.00.00.00.00.00.00.04.90.086.97.863.313.926.58.9

nwbi:PersonalBanking


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312014-12-31
Value77000.031000.032000.085000.055000.0166000.0166000.0195000.094000.0210000.0502000.0398000.0173000.0265000.085000.095000.0173000.0770000.0980000.0214000.0
Percentage of FinancingReceivableRecordedInvestment90DaysOrMorePastMaturityAndStillAccruing100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.095.1100.013.192.236.786.173.591.1

nwbi:FinancingReceivableRecordedInvestment90DaysOrMorePastMaturityAndStillAccruing us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable

nwbi:BusinessBanking, us-gaap:CommercialLoan


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312014-12-31
Value0000000000009000.0008000.0299000.00148000.021000.0
Percentage of FinancingReceivableRecordedInvestment90DaysOrMorePastMaturityAndStillAccruing0.00.00.00.00.00.00.00.00.00.00.00.04.90.00.07.863.30.011.18.9

nwbi:PersonalBanking, nwbi:ConsumerFinanceLoans


None
Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302016-12-31
Value0035000.0003000.00003000.000
Percentage of FinancingReceivableRecordedInvestment90DaysOrMorePastMaturityAndStillAccruing0.00.041.20.00.01.80.00.00.00.60.00.0

nwbi:PersonalBanking, us-gaap:ConsumerLoan


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312014-12-31
Value1000.00050000.00027000.0123000.035000.0121000.0379000.0252000.0173000.0265000.085000.095000.0171000.0766000.0976000.0206000.0
Percentage of FinancingReceivableRecordedInvestment90DaysOrMorePastMaturityAndStillAccruing1.30.00.058.80.00.016.363.137.257.675.563.395.1100.013.192.236.285.773.287.7

nwbi:PersonalBanking, us-gaap:HomeEquityLoan


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312014-12-31
Value48000.031000.032000.0055000.0166000.0136000.072000.059000.089000.0120000.0146000.000000000
Percentage of FinancingReceivableRecordedInvestment90DaysOrMorePastMaturityAndStillAccruing62.3100.0100.00.0100.0100.081.936.962.842.423.936.70.00.00.00.00.00.00.00.0

nwbi:PersonalBanking, us-gaap:ResidentialMortgage


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312014-12-31
Value28000.00000000000000002000.04000.04000.08000.0
Percentage of FinancingReceivableRecordedInvestment90DaysOrMorePastMaturityAndStillAccruing36.40.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.40.40.33.4

nwbi:FinancingReceivableRevolvingConvertedToTermLoan

nwbi:FinancingReceivableRevolvingConvertedToTermLoan


None
Period End2020-03-31
Value78
Percentage of FinancingReceivableRevolvingConvertedToTermLoan100.0

nwbi:FinancingReceivableRevolvingConvertedToTermLoan us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable

nwbi:AcquiredLoan, nwbi:BusinessBanking, us-gaap:CommercialRealEstate


None
Period End2020-03-31
Value10
Percentage of FinancingReceivableRevolvingConvertedToTermLoan13.7

nwbi:OriginatedLoan, nwbi:PersonalBanking, us-gaap:AutomobileLoan


None
Period End2020-03-31
Value0.0
Percentage of FinancingReceivableRevolvingConvertedToTermLoan0.0

nwbi:OriginatedLoan, nwbi:PersonalBanking, us-gaap:HomeEquityLoan


None
Period End2020-03-31
Value37
Percentage of FinancingReceivableRevolvingConvertedToTermLoan48.3

nwbi:OriginatedLoan, nwbi:PersonalBanking, us-gaap:ResidentialMortgage


None
Period End2020-03-31
Value0.0
Percentage of FinancingReceivableRevolvingConvertedToTermLoan0.0

nwbi:FinancingReceivableRevolvingConvertedToTermLoan us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:InternalCreditAssessment

nwbi:AcquiredLoan, nwbi:BusinessBanking, us-gaap:CommercialRealEstate, us-gaap:Doubtful


None
Period End2020-03-31
Value0.0
Percentage of FinancingReceivableRevolvingConvertedToTermLoan0.0

nwbi:AcquiredLoan, nwbi:BusinessBanking, us-gaap:CommercialRealEstate, us-gaap:Pass


None
Period End2020-03-31
Value5.952
Percentage of FinancingReceivableRevolvingConvertedToTermLoan7.6

nwbi:AcquiredLoan, nwbi:BusinessBanking, us-gaap:CommercialRealEstate, us-gaap:UnlikelyToBeCollectedFinancingReceivable


None
Period End2020-03-31
Value0.0
Percentage of FinancingReceivableRevolvingConvertedToTermLoan0.0

nwbi:OriginatedLoan, nwbi:PersonalBanking, us-gaap:ConsumerLoan, us-gaap:Pass


None
Period End2020-03-31
Value2.942
Percentage of FinancingReceivableRevolvingConvertedToTermLoan3.7

nwbi:OriginatedLoan, nwbi:PersonalBanking, us-gaap:ResidentialMortgage, us-gaap:Pass


None
Period End2020-03-31
Value0.0
Percentage of FinancingReceivableRevolvingConvertedToTermLoan0.0

nwbi:OriginatedLoan, nwbi:PersonalBanking, us-gaap:ResidentialMortgage, us-gaap:Substandard


None
Period End2020-03-31
Value0.0
Percentage of FinancingReceivableRevolvingConvertedToTermLoan0.0

nwbi:FinancingReceivableRevolvingConvertedToTermLoan us-gaap:FinancingReceivablePortfolioSegment

nwbi:BusinessBanking


None
Period End2020-03-31
Value37
Percentage of FinancingReceivableRevolvingConvertedToTermLoan47.9

nwbi:PersonalBanking


None
Period End2020-03-31
Value41
Percentage of FinancingReceivableRevolvingConvertedToTermLoan52.1

nwbi:FinancingReceivableRevolvingConvertedToTermLoan us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable

nwbi:BusinessBanking, nwbi:CommercialRealEstateOwnerOccupied


None
Period End2020-03-31
Value6.754
Percentage of FinancingReceivableRevolvingConvertedToTermLoan8.6

nwbi:BusinessBanking, us-gaap:CommercialLoan


None
Period End2020-03-31
Value20
Percentage of FinancingReceivableRevolvingConvertedToTermLoan25.6

nwbi:PersonalBanking, us-gaap:ConsumerLoan


None
Period End2020-03-31
Value3.034
Percentage of FinancingReceivableRevolvingConvertedToTermLoan3.9

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

nwbi:BusinessBanking, nwbi:CommercialRealEstateOwnerOccupied, us-gaap:Doubtful


None
Period End2020-03-31
Value0.0
Percentage of FinancingReceivableRevolvingConvertedToTermLoan0.0

nwbi:BusinessBanking, nwbi:CommercialRealEstateOwnerOccupied, us-gaap:Pass


None
Period End2020-03-31
Value3.44
Percentage of FinancingReceivableRevolvingConvertedToTermLoan4.4

nwbi:BusinessBanking, nwbi:CommercialRealEstateOwnerOccupied, us-gaap:SpecialMention


None
Period End2020-03-31
Value0.03
Percentage of FinancingReceivableRevolvingConvertedToTermLoan0.0

nwbi:BusinessBanking, nwbi:CommercialRealEstateOwnerOccupied, us-gaap:Substandard


None
Period End2020-03-31
Value3.284
Percentage of FinancingReceivableRevolvingConvertedToTermLoan4.2

nwbi:BusinessBanking, nwbi:CommercialRealEstateOwnerOccupied, us-gaap:UnlikelyToBeCollectedFinancingReceivable


None
Period End2020-03-31
Value0.0
Percentage of FinancingReceivableRevolvingConvertedToTermLoan0.0

nwbi:BusinessBanking, us-gaap:CommercialLoan, us-gaap:Doubtful


None
Period End2020-03-31
Value0.0
Percentage of FinancingReceivableRevolvingConvertedToTermLoan0.0

nwbi:BusinessBanking, us-gaap:CommercialLoan, us-gaap:Pass


None
Period End2020-03-31
Value9.735
Percentage of FinancingReceivableRevolvingConvertedToTermLoan12.4

nwbi:BusinessBanking, us-gaap:CommercialLoan, us-gaap:SpecialMention


None
Period End2020-03-31
Value0.418
Percentage of FinancingReceivableRevolvingConvertedToTermLoan0.5

nwbi:BusinessBanking, us-gaap:CommercialLoan, us-gaap:Substandard


None
Period End2020-03-31
Value10
Percentage of FinancingReceivableRevolvingConvertedToTermLoan12.7

nwbi:BusinessBanking, us-gaap:CommercialLoan, us-gaap:UnlikelyToBeCollectedFinancingReceivable


None
Period End2020-03-31
Value0.0
Percentage of FinancingReceivableRevolvingConvertedToTermLoan0.0

nwbi:BusinessBanking, us-gaap:CommercialRealEstate, us-gaap:SpecialMention


None
Period End2020-03-31
Value0.801
Percentage of FinancingReceivableRevolvingConvertedToTermLoan1.0

nwbi:BusinessBanking, us-gaap:CommercialRealEstate, us-gaap:Substandard


None
Period End2020-03-31
Value4.017
Percentage of FinancingReceivableRevolvingConvertedToTermLoan5.1

nwbi:PersonalBanking, us-gaap:AutomobileLoan, us-gaap:Pass


None
Period End2020-03-31
Value0.0
Percentage of FinancingReceivableRevolvingConvertedToTermLoan0.0

nwbi:PersonalBanking, us-gaap:AutomobileLoan, us-gaap:Substandard


None
Period End2020-03-31
Value0.0
Percentage of FinancingReceivableRevolvingConvertedToTermLoan0.0

nwbi:PersonalBanking, us-gaap:ConsumerLoan, us-gaap:Substandard


None
Period End2020-03-31
Value0.092
Percentage of FinancingReceivableRevolvingConvertedToTermLoan0.1

nwbi:PersonalBanking, us-gaap:HomeEquityLoan, us-gaap:Pass


None
Period End2020-03-31
Value36
Percentage of FinancingReceivableRevolvingConvertedToTermLoan46.1

nwbi:PersonalBanking, us-gaap:HomeEquityLoan, us-gaap:Substandard


None
Period End2020-03-31
Value1.666
Percentage of FinancingReceivableRevolvingConvertedToTermLoan2.1

nwbi:FinancingReceivableTroubledDebtRestructuringExcludingNonaccrual

nwbi:FinancingReceivableTroubledDebtRestructuringExcludingNonaccrual


None
Period End2020-06-302019-12-31
Value3531
Percentage of FinancingReceivableTroubledDebtRestructuringExcludingNonaccrual100.0100.0

nwbi:FinancingReceivableTroubledDebtRestructuringExcludingNonaccrual us-gaap:FinancingReceivablePortfolioSegment

nwbi:BusinessBanking


None
Period End2020-06-302019-12-31
Value2422
Percentage of FinancingReceivableTroubledDebtRestructuringExcludingNonaccrual70.370.2

nwbi:PersonalBanking


None
Period End2020-06-302019-12-31
Value109.523
Percentage of FinancingReceivableTroubledDebtRestructuringExcludingNonaccrual29.729.8

nwbi:FinancingReceivableTroubledDebtRestructuringExcludingNonaccrual us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable

nwbi:BusinessBanking, nwbi:CommercialRealEstateOwnerOccupied


None
Period End2020-06-30
Value6.65
Percentage of FinancingReceivableTroubledDebtRestructuringExcludingNonaccrual18.8

nwbi:BusinessBanking, us-gaap:CommercialLoan


None
Period End2020-06-302019-12-31
Value5.5043.118
Percentage of FinancingReceivableTroubledDebtRestructuringExcludingNonaccrual15.59.7

nwbi:BusinessBanking, us-gaap:CommercialRealEstate


None
Period End2020-06-302019-12-31
Value1219
Percentage of FinancingReceivableTroubledDebtRestructuringExcludingNonaccrual36.060.5

nwbi:PersonalBanking, nwbi:ConsumerFinanceLoans


None
Period End2020-06-30
Value0.0
Percentage of FinancingReceivableTroubledDebtRestructuringExcludingNonaccrual0.0

nwbi:PersonalBanking, us-gaap:ConsumerLoan


None
Period End2020-06-302019-12-31
Value0.0010.0
Percentage of FinancingReceivableTroubledDebtRestructuringExcludingNonaccrual0.00.0

nwbi:PersonalBanking, us-gaap:HomeEquityLoan


None
Period End2020-06-302019-12-31
Value2.1211.973
Percentage of FinancingReceivableTroubledDebtRestructuringExcludingNonaccrual6.06.2

nwbi:PersonalBanking, us-gaap:ResidentialMortgage


None
Period End2020-06-302019-12-31
Value8.4117.55
Percentage of FinancingReceivableTroubledDebtRestructuringExcludingNonaccrual23.723.6

nwbi:HeldToMaturityAndAvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses2

nwbi:HeldToMaturityAndAvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses2


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302012-12-31
Value0.1440.22.0872.553.518.184121812118.7246.1512.4612.6842.8921.421.3931.9844.9533.0415.0954.2138.47310104.6684.9382.0762.94
Percentage of HeldToMaturityAndAvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses2100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

nwbi:HeldToMaturityAndAvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses2 us-gaap:InvestmentSecondaryCategorization, us-gaap:InvestmentType

us-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprises, us-gaap:ResidentialMortgageBackedSecurities


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312013-12-31
Value0.0510.0971.7512.092.7116.49210149.2347.8565.9574.2342.1292.322.4711.0430.8731.4663.7622.5833.9763.1315.4212.383
Percentage of HeldToMaturityAndAvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses235.448.583.982.077.279.381.081.773.069.768.368.886.586.485.473.562.773.976.084.978.074.364.048.3

nwbi:HeldToMaturityAndAvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses2 us-gaap:InvestmentType

us-gaap:USGovernmentAgenciesDebtSecurities


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312012-12-31
Value0.0930.1030.3360.460.7991.6922.4493.363.4133.422.7611.6980.1020.0720.0920.0220.0510.0070.7860.1630.7230.6382.6333.6213.1322.3052.1060.001
Percentage of HeldToMaturityAndAvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses264.651.516.118.022.820.719.018.327.030.331.627.64.12.73.21.53.70.415.95.414.215.131.133.331.149.442.60.0

us-gaap:USStatesAndPoliticalSubdivisions


None
Period End2020-06-302019-09-302019-06-302018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value0.00.00.00.010.00.00.00.00.00.00.0010.0010.00.00.00.0
Percentage of HeldToMaturityAndAvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses20.00.00.00.10.00.00.00.00.00.00.00.00.00.00.00.0

nwbi:HeldToMaturityAndAvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLosses1

nwbi:HeldToMaturityAndAvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLosses1


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302012-12-31
Value1.1971.0472.9452.8373.8938.34912201816117.1297.6128.8559.2141.7261.5522.1956.2843.2885.544.4428.73511101320154.341
Percentage of HeldToMaturityAndAvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLosses1100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

nwbi:HeldToMaturityAndAvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLosses1 us-gaap:InvestmentSecondaryCategorization, us-gaap:InvestmentType

us-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprises, us-gaap:ResidentialMortgageBackedSecurities


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312013-12-31
Value1.0940.9442.6092.3773.0926.657101714138.4795.0485.3726.2236.3081.2410.9431.5014.362.644.0493.2355.512
Percentage of HeldToMaturityAndAvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLosses191.490.288.683.879.479.781.082.480.978.975.370.870.670.368.571.960.868.469.480.373.172.863.062.0

nwbi:HeldToMaturityAndAvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLosses1 us-gaap:InvestmentType

us-gaap:USGovernmentAgenciesDebtSecurities


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302012-12-31
Value0.0930.1030.3360.460.7991.6922.4493.573.4493.4492.7681.8592.0072.3312.540.1280.0520.1751.5090.3341.0630.7222.73.6863.1345.1236.9035.4680.287
Percentage of HeldToMaturityAndAvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLosses17.89.811.416.220.520.318.917.218.920.924.626.126.426.327.67.43.48.024.010.219.216.330.932.630.637.433.535.66.6

us-gaap:USStatesAndPoliticalSubdivisions


None
Period End2020-06-302019-09-302019-06-302018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302014-06-302014-03-312013-12-312013-09-30
Value0.010.00.0020.0110.070.0340.0310.0070.0030.0030.010.0380.0020.0010.0020.0040.0130.0320.0090.0340.4130.217
Percentage of HeldToMaturityAndAvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLosses10.80.00.10.10.30.20.20.10.00.00.10.40.10.10.10.10.40.60.10.22.01.4

nwbi:HeldToMaturityAndAvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue

nwbi:HeldToMaturityAndAvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302012-12-312012-09-30
Value19057335270360490519715669644649607661623556346149207518447414388492513523546628646276107
Percentage of HeldToMaturityAndAvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

nwbi:HeldToMaturityAndAvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue us-gaap:InvestmentSecondaryCategorization, us-gaap:InvestmentType

us-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprises, us-gaap:ResidentialMortgageBackedSecurities


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312013-12-31
Value18755282203237354380505471440442372377341301185115129271257184184216333
Percentage of HeldToMaturityAndAvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue98.596.084.375.065.972.173.270.670.468.468.061.457.254.854.153.577.862.452.457.544.547.443.953.1

nwbi:HeldToMaturityAndAvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue us-gaap:InvestmentType

us-gaap:USGovernmentAgenciesDebtSecurities


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302012-12-31
Value2.2212.325267122136136186192196202229276276247156267123618322620127327326527527828576
Percentage of HeldToMaturityAndAvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue1.24.015.725.034.027.926.226.028.730.531.237.941.844.344.445.017.834.645.641.054.851.755.653.350.750.444.344.127.8

us-gaap:USStatesAndPoliticalSubdivisions


None
Period End2020-06-302019-09-302019-06-302018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-06-302014-03-312013-12-312013-09-30
Value0.5550.00.5022.6389.0256.2517.1274.5631.7354.1152.675.6872.42.1883.8127.5054.1750.750.7820.7730.747126.842
Percentage of HeldToMaturityAndAvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue0.30.00.10.51.30.91.10.70.30.60.41.00.71.51.81.40.90.20.20.10.12.01.1

nwbi:HeldToMaturityAndAvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses1

nwbi:HeldToMaturityAndAvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses1


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302012-12-312012-09-30
Value1.0530.8470.8580.2870.3830.1650.0312.3875.615.2382.5360.9785.1516.1716.3220.3060.1590.2111.3310.2470.4450.2290.2620.4480.1589.04115131.4010.4
Percentage of HeldToMaturityAndAvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses1100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

nwbi:HeldToMaturityAndAvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses1 us-gaap:InvestmentSecondaryCategorization, us-gaap:InvestmentType

us-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprises, us-gaap:ResidentialMortgageBackedSecurities


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312013-12-31
Value1.0430.8470.8580.2870.3810.1650.032.0955.545.1782.5220.8143.2433.9033.8370.1980.070.0350.5980.0570.0730.1040.07910
Percentage of HeldToMaturityAndAvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses199.1100.0100.0100.099.5100.096.887.898.898.999.483.263.063.260.764.744.016.644.923.116.445.430.266.3

nwbi:HeldToMaturityAndAvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses1 us-gaap:InvestmentType

us-gaap:USGovernmentAgenciesDebtSecurities


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302012-12-31
Value0.00.00.00.00.00.00.00.210.0360.0290.0070.1611.9052.2592.4480.1060.0010.1680.7230.1710.340.0840.0670.0650.0022.8184.7975.4680.286
Percentage of HeldToMaturityAndAvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses10.00.00.00.00.00.00.08.80.60.60.316.537.036.638.734.60.679.654.369.276.436.725.614.51.331.230.641.220.4

us-gaap:USStatesAndPoliticalSubdivisions


None
Period End2020-06-302019-09-302019-06-302018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302014-06-302014-03-312013-12-312013-09-30
Value0.010.00.0020.0010.070.0340.0310.0070.0030.0030.0090.0370.0020.0010.0020.0040.0130.0320.0090.0340.4130.217
Percentage of HeldToMaturityAndAvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses10.90.00.53.22.90.60.60.30.30.10.10.60.70.60.90.35.37.25.70.42.61.6

nwbi:HeldToMaturityAndAvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue

nwbi:HeldToMaturityAndAvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302012-12-312012-09-30
Value18146173794131342552792622492525485224572494763273911209750484937345256323871
Percentage of HeldToMaturityAndAvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

nwbi:HeldToMaturityAndAvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue us-gaap:InvestmentSecondaryCategorization, us-gaap:InvestmentType

us-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprises, us-gaap:ResidentialMortgageBackedSecurities


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312013-12-31
Value1804617379413134176262250239195295251213101271712222181920224
Percentage of HeldToMaturityAndAvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue99.7100.0100.0100.098.8100.097.369.093.895.496.277.453.948.246.740.658.327.744.624.415.020.341.549.5

nwbi:HeldToMaturityAndAvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue us-gaap:InvestmentType

us-gaap:USGovernmentAgenciesDebtSecurities


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302012-12-31
Value0.00.00.00.00.00.00.055104.9825.006552482682381451441143641017528123.2315921328570
Percentage of HeldToMaturityAndAvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue0.00.00.00.00.00.00.021.83.91.92.021.945.351.352.058.431.965.552.570.584.378.357.524.86.642.847.350.729.4

us-gaap:USStatesAndPoliticalSubdivisions


None
Period End2020-06-302019-09-302019-06-302018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-06-302014-03-312013-12-312013-09-30
Value0.5550.00.5020.9299.0256.2517.1274.5631.7354.1152.6045.6212.3342.1883.8127.5054.1750.750.7820.7730.747126.842
Percentage of HeldToMaturityAndAvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue0.30.01.22.73.52.22.71.80.70.80.51.20.94.66.02.74.50.60.81.60.22.81.2

nwbi:HeldToMaturityAndAvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue

nwbi:HeldToMaturityAndAvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302012-12-31
Value8.9431116119131845948446038938240035411210099971021442443552932914424644741721758337
Percentage of HeldToMaturityAndAvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

nwbi:HeldToMaturityAndAvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue us-gaap:InvestmentSecondaryCategorization, us-gaap:InvestmentType

us-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprises, us-gaap:ResidentialMortgageBackedSecurities


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312013-12-31
Value6.7229.1671091231963223463292081902021778289878488112149234166164195109
Percentage of HeldToMaturityAndAvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue75.279.867.564.761.670.271.571.653.649.950.550.072.989.288.086.686.777.861.266.056.756.444.262.1

nwbi:HeldToMaturityAndAvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue us-gaap:InvestmentType

us-gaap:USGovernmentAgenciesDebtSecurities


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312012-12-31
Value2.2212.325267122136136130181191197174278.1639.20510113092118125125244261262115646.537
Percentage of HeldToMaturityAndAvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue24.820.232.535.338.429.828.128.446.450.149.449.224.78.19.210.711.320.838.033.442.642.955.356.355.366.836.717.6

us-gaap:USStatesAndPoliticalSubdivisions


None
Period End2020-06-302019-09-302019-06-302018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value0.00.00.01.7090.00.00.00.00.00.00.0660.0660.0660.00.00.0
Percentage of HeldToMaturityAndAvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue0.00.00.00.40.00.00.00.00.00.00.10.10.10.00.00.0

nwbi:LoansAndLeasesReceivableAllowanceExcludingUnallocated

nwbi:LoansAndLeasesReceivableAllowanceExcludingUnallocated


None
Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302011-12-31
Value9257525355555557555656626160636062626059636367677266716867696666
Percentage of LoansAndLeasesReceivableAllowanceExcludingUnallocated100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

nwbi:LoansAndLeasesReceivableAllowanceExcludingUnallocated us-gaap:FinancingReceivablePortfolioSegment

nwbi:BusinessBanking


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312014-12-31
Value10355393434363634353334354441434444464646
Percentage of LoansAndLeasesReceivableAllowanceExcludingUnallocated0.059.568.365.264.964.965.362.562.761.561.063.270.367.470.670.773.675.273.974.3

nwbi:PersonalBanking


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312014-12-31
Value3737181818191921212122201819171816151616
Percentage of LoansAndLeasesReceivableAllowanceExcludingUnallocated0.040.531.734.835.135.134.737.537.338.539.036.829.732.629.429.326.424.826.125.7

nwbi:LoansAndLeasesReceivableAllowanceExcludingUnallocated us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable

nwbi:BusinessBanking, nwbi:CommercialRealEstateOwnerOccupied


None
Period End2020-06-302020-03-31
Value148.374
Percentage of LoansAndLeasesReceivableAllowanceExcludingUnallocated0.09.0

nwbi:BusinessBanking, us-gaap:CommercialLoan


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312014-12-31
Value15171710108.2377.6716.402111011121916161715151213
Percentage of LoansAndLeasesReceivableAllowanceExcludingUnallocated0.018.931.120.120.614.813.911.420.118.719.721.930.527.626.928.126.224.420.021.4

nwbi:BusinessBanking, us-gaap:CommercialRealEstate


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value72292123232728282423
Percentage of LoansAndLeasesReceivableAllowanceExcludingUnallocated0.031.637.345.144.350.151.451.042.641.3

nwbi:PersonalBanking, nwbi:ConsumerFinanceLoans


None
Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302016-12-31
Value13110.140.2660.4050.6761.652.3543.0313.9684.8763.445
Percentage of LoansAndLeasesReceivableAllowanceExcludingUnallocated0.012.90.30.50.71.22.94.15.57.08.65.7

nwbi:PersonalBanking, us-gaap:ConsumerLoan


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312014-12-31
Value2.5065.166121211111011109.9479.3657.97710118.6279.748.4767.4937.5986.118
Percentage of LoansAndLeasesReceivableAllowanceExcludingUnallocated0.05.621.623.820.720.819.620.518.618.016.514.016.518.414.215.413.912.012.19.7

nwbi:PersonalBanking, us-gaap:HomeEquityLoan


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312014-12-31
Value9.3639.7863.1893.0863.3343.4623.5323.6424.5014.4454.8344.0433.583.9214.5334.694.4633.7074.0424.55
Percentage of LoansAndLeasesReceivableAllowanceExcludingUnallocated0.010.55.55.86.36.26.46.57.98.18.57.15.76.47.47.47.36.06.47.2

nwbi:PersonalBanking, us-gaap:ResidentialMortgage


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312014-12-31
Value11102.5742.5994.0134.0974.1374.2463.8273.8133.9554.0634.724.7164.7274.083.0834.2654.715.581
Percentage of LoansAndLeasesReceivableAllowanceExcludingUnallocated0.011.54.44.97.67.47.57.66.76.97.07.17.57.77.86.55.16.87.58.8

nwbi:LoansReceivableMeasurementInput us-gaap:Range, us-gaap:FairValueByAssetClass, us-gaap:MeasurementInputType, us-gaap:ValuationTechnique

nwbi:LoansReceivableMeasurementInput

srt:Maximum, nwbi:ImpairedLoans, us-gaap:MeasurementInputDiscountRate, nwbi:DiscountedCashFlowValuationTechnique


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value0.1980.110.110.110.110.10.10.10.1
Percentage of LoansReceivableMeasurementInput100.0100.0100.0100.0100.0100.0100.0100.0100.0

srt:Minimum, nwbi:ImpairedLoans, us-gaap:MeasurementInputDiscountRate, nwbi:DiscountedCashFlowValuationTechnique


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value0.12750.04250.04250.04250.04250.04250.04250.04250.0425
Percentage of LoansReceivableMeasurementInput64.438.638.638.638.642.542.542.542.5

srt:WeightedAverage, nwbi:ImpairedLoans, us-gaap:MeasurementInputDiscountRate, nwbi:DiscountedCashFlowValuationTechnique


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value0.16250.0750.0750.0750.0750.0750.0750.0750.075
Percentage of LoansReceivableMeasurementInput82.168.268.268.268.275.075.075.075.0

nwbi:NumberOfBusinessTrustsOwned us-gaap:ScheduleOfSharesSubjectToMandatoryRedemptionBySettlementTerms, dei:LegalEntity

nwbi:NumberOfBusinessTrustsOwned

us-gaap:TrustPreferredSecuritiesSubjectToMandatoryRedemption, nwbi:MFBCStatutoryTrust


None
Period End2020-06-30
Value2.0
Percentage of NumberOfBusinessTrustsOwned100.0

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

nwbi:ResidentialMortgageBackedSecuritiesAvailableForSaleFairValueDisclosure

us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring, us-gaap:FederalHomeLoanMortgageCorporationCertificatesAndObligationsFHLMC


None
Period End2020-06-302019-12-31
Value15150
Percentage of ResidentialMortgageBackedSecuritiesAvailableForSaleFairValueDisclosure100.0100.0

us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring, us-gaap:FederalNationalMortgageAssociationCertificatesAndObligationsFNMA


None
Period End2020-06-302019-12-31
Value17089
Percentage of ResidentialMortgageBackedSecuritiesAvailableForSaleFairValueDisclosure112.7178.0

us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring, us-gaap:GovernmentNationalMortgageAssociationCertificatesAndObligationsGNMA


None
Period End2020-06-302019-12-31
Value2823
Percentage of ResidentialMortgageBackedSecuritiesAvailableForSaleFairValueDisclosure18.746.4

us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring, us-gaap:MortgageBackedSecuritiesIssuedByPrivateEnterprises


None
Period End2020-06-302019-12-31
Value0.4820.497
Percentage of ResidentialMortgageBackedSecuritiesAvailableForSaleFairValueDisclosure0.31.0

nwbi:ResidentialMortgageBackedSecuritiesAvailableForSaleFairValueDisclosure us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument

us-gaap:FairValueMeasurementsRecurring, us-gaap:FederalHomeLoanMortgageCorporationCertificatesAndObligationsFHLMC


None
Period End2020-06-302019-12-31
Value15150
Percentage of ResidentialMortgageBackedSecuritiesAvailableForSaleFairValueDisclosure100.0100.0

us-gaap:FairValueMeasurementsRecurring, us-gaap:FederalNationalMortgageAssociationCertificatesAndObligationsFNMA


None
Period End2020-06-302019-12-31
Value17089
Percentage of ResidentialMortgageBackedSecuritiesAvailableForSaleFairValueDisclosure112.7178.0

us-gaap:FairValueMeasurementsRecurring, us-gaap:GovernmentNationalMortgageAssociationCertificatesAndObligationsGNMA


None
Period End2020-06-302019-12-31
Value2823
Percentage of ResidentialMortgageBackedSecuritiesAvailableForSaleFairValueDisclosure18.746.4

us-gaap:FairValueMeasurementsRecurring, us-gaap:MortgageBackedSecuritiesIssuedByPrivateEnterprises


None
Period End2020-06-302019-12-31
Value0.4820.497
Percentage of ResidentialMortgageBackedSecuritiesAvailableForSaleFairValueDisclosure0.31.0

nwbi:SavingsAndDemandDeposits us-gaap:FairValueByFairValueHierarchyLevel

nwbi:SavingsAndDemandDeposits

us-gaap:FairValueInputsLevel1


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-31
Value96397298702270487083706564896550660265646414650665036490634165115039503049174882429642534154417441934148400140064020397938783862377236893495
Percentage of SavingsAndDemandDeposits100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

nwbi:SavingsAndDemandDeposits us-gaap:FairValueByMeasurementBasis

us-gaap:CarryingReportedAmountFairValueDisclosure


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312012-12-31
Value9639729870227048708370656489655066026564641465066503649063416511503950304917488242964253415441744193414840013878
Percentage of SavingsAndDemandDeposits100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EstimateOfFairValueFairValueDisclosure


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312012-12-31
Value9639729870227048708370656489655066026564641465066503649063416511503950304917488242964253415441744193414840013878
Percentage of SavingsAndDemandDeposits100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AccruedLiabilitiesFairValueDisclosure us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:AccruedLiabilitiesFairValueDisclosure

us-gaap:FairValueInputsLevel1


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-31
Value1389000.0834000.01142000.01314000.01207000.01111000.0744000.0627000.0568000.0528000.0460000.0518000.0530000.0586000.0643000.0682000.0737000.01894000.01993000.01816000.01302000.01336000.0936000.0880000.0816000.0860000.0888000.0861000.01043000.01180000.0888000.01111000.01242000.01119000.01104000.0
Percentage of AccruedLiabilitiesFairValueDisclosure100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AccruedLiabilitiesFairValueDisclosure us-gaap:FairValueByMeasurementBasis

us-gaap:CarryingReportedAmountFairValueDisclosure


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312012-12-31
Value1389000.0834000.01142000.01314000.01207000.01111000.0744000.0627000.0568000.0528000.0460000.0518000.0530000.0586000.0643000.0682000.0737000.01894000.01993000.01816000.01302000.01336000.0936000.0880000.0816000.0860000.0888000.0888000.0
Percentage of AccruedLiabilitiesFairValueDisclosure100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EstimateOfFairValueFairValueDisclosure


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312012-12-31
Value1389000.0834000.01142000.01314000.01207000.01111000.0744000.0627000.0568000.0528000.0460000.0518000.0530000.0586000.0643000.0682000.0737000.01894000.01993000.01816000.01302000.01336000.0936000.0880000.0816000.0860000.0888000.0888000.0
Percentage of AccruedLiabilitiesFairValueDisclosure100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AdvancePaymentsByBorrowersForTaxesAndInsurance

us-gaap:AdvancePaymentsByBorrowersForTaxesAndInsurance


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-31
Value584744245444432351434021484036214538331841343016373126143327231132272312302622
Percentage of AdvancePaymentsByBorrowersForTaxesAndInsurance100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AssetsFairValueDisclosure us-gaap:FairValueByFairValueHierarchyLevel