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Mortgage Banking Activities, Loans Sold With Recourse (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Residential mortgage loans sold with recourse [Abstract]      
Carrying amount of residential mortgage loans sold and subject to recourse $ 180,000,000bokf_CarryingAmountOfResidentialMortgageLoansSoldAndSubjectToRepurchaseAgreement $ 191,000,000bokf_CarryingAmountOfResidentialMortgageLoansSoldAndSubjectToRepurchaseAgreement  
Percentage of loans sold with recourse and either more than 90 days past due or in bankruptcy of foreclosure (in hundreths) 4.00%bokf_PercentageOfLoansSoldWithRecourseAndMoreThan90DaysPastDueOrInBankruptcyOrForeclosure    
Principal balance of loans sold with recourse and either 90 days or more past due or in bankruptcy or foreclosure 7,100,000bokf_LoansSoldUnderAgreementsToRepurchaseEither90DaysOrMorePastDueOrInBankruptcyOrForeclosure    
Percentage of loans sold with recourse and 30 to 89 days past due (in hundreths) 5.00%bokf_PercentageOfLoansSoldWithRecourseAnd30To89DaysPastDue    
Principal balance of loans sold with recourse and 30 to 89 days past due 8,400,000bokf_LoansSoldUnderAgreementsToRepurchaseAnd30To89DaysPastDue    
Activity in the allowance for losses on loans sold with recourse [Abstract]      
Beginning balance 9,562,000bokf_AccrualForLossesOnMortgageLoansSoldWithRecourse 13,158,000bokf_AccrualForLossesOnMortgageLoansSoldWithRecourse 18,683,000bokf_AccrualForLossesOnMortgageLoansSoldWithRecourse
Provision for recourse losses 354,000bokf_Provisionforrecourselosses 517,000bokf_Provisionforrecourselosses (100,000)bokf_Provisionforrecourselosses
Loans charged off, net (2,617,000)bokf_LiabilityForMortgageLoanRepurchaseLossesReductionsLosses (4,113,000)bokf_LiabilityForMortgageLoanRepurchaseLossesReductionsLosses (5,425,000)bokf_LiabilityForMortgageLoanRepurchaseLossesReductionsLosses
Ending balance 7,299,000bokf_AccrualForLossesOnMortgageLoansSoldWithRecourse 9,562,000bokf_AccrualForLossesOnMortgageLoansSoldWithRecourse 13,158,000bokf_AccrualForLossesOnMortgageLoansSoldWithRecourse
Residential Mortgage Loans Subject to Repurchase Under Standard Representations and Warranties [Abstract]      
Number of mortgages purchased under repurchase agreement with US government sponsored entities 41bokf_NumberOfMortgagesPurchasedUnderRepurchaseAgreement    
Purchase price of loans purchased under repurchase agreement with government sponsored entities 6,500,000bokf_PurchasePriceOfLoansPurchasedUnderRepurchaseAgreementWithGovernmentSponsoredEntities    
Losses incurred on actual repurchased loans from governmental sponsored entities with warranties 62,000bokf_LossesIncurredOnActualRepurchasedLoansFromGovernmentalSponsoredEntitiesWithWarranties    
Number of loans sold under standard representation and warranties indemnified 17bokf_NumberOfLoanForWhichIndemnificationWasPaid    
Losses on mortgage loans indemnified during period 613,000bokf_LossesOnMortgageLoansIndemnifiedDuringPeriod    
Number of loans with unresolved deficiency requests 186bokf_NumberOfLoansWithUnresolvedDeficiencyRequests 578bokf_NumberOfLoansWithUnresolvedDeficiencyRequests  
Principal balance of loans with unresolved deficiency requests 15,328,000bokf_PrincipalBalanceOfLoansWithUnresolvedDeficiencyRequests 69,288,000bokf_PrincipalBalanceOfLoansWithUnresolvedDeficiencyRequests  
Unpaid principal balance of mortgage loans subject to indemnification under standard representations and warranties 4,047,000bokf_UnpaidPrincipalBalanceOfMortgageLoansSubjectToIndemnificationUnderStandardRepresentationsAndWarranties 3,200,000bokf_UnpaidPrincipalBalanceOfMortgageLoansSubjectToIndemnificationUnderStandardRepresentationsAndWarranties  
Activity in Accruals for Mortgage Losses [Roll Forward]      
Beginning balance 12,716,000bokf_AccrualForMortgageLosses 8,983,000bokf_AccrualForMortgageLosses  
Provision for losses 7,200,000bokf_ProvisionforMortgageLosses 6,221,000bokf_ProvisionforMortgageLosses  
Charge-offs, net (8,048,000)bokf_MortgageLossesAccrualChargeoffs (2,488,000)bokf_MortgageLossesAccrualChargeoffs  
Ending balance $ 11,868,000bokf_AccrualForMortgageLosses $ 12,716,000bokf_AccrualForMortgageLosses $ 8,983,000bokf_AccrualForMortgageLosses