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Federal and State Income Taxes (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Deferred tax assets [Abstract]      
Available for sale securities mark to market $ 0us-gaap_DeferredTaxAssetsInvestments $ 14,751,000us-gaap_DeferredTaxAssetsInvestments  
Share-based compensation 9,414,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost 8,064,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost  
Credit loss allowances 74,362,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses 75,657,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses  
Valuation adjustments 36,870,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsImpairmentLosses 35,292,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsImpairmentLosses  
Deferred compensation 23,333,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation 60,068,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation  
Unearned fees 11,820,000us-gaap_DeferredTaxAssetsDeferredIncome 10,683,000us-gaap_DeferredTaxAssetsDeferredIncome  
Other 26,633,000us-gaap_DeferredTaxAssetsOther 22,348,000us-gaap_DeferredTaxAssetsOther  
Total deferred tax assets 182,432,000us-gaap_DeferredTaxAssetsGross 226,863,000us-gaap_DeferredTaxAssetsGross  
Deferred tax liabilities [Abstract]      
Available for sale securities mark to market 37,719,000us-gaap_DeferredTaxLiabilitiesInvestments 0us-gaap_DeferredTaxLiabilitiesInvestments  
Depreciation 18,601,000us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment 17,333,000us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment  
Mortgage servicing rights 86,752,000us-gaap_DeferredTaxLiabilitiesMortgageServicingRights 72,235,000us-gaap_DeferredTaxLiabilitiesMortgageServicingRights  
Lease financing 24,429,000us-gaap_DeferredTaxLiabilitiesLeasingArrangements 23,202,000us-gaap_DeferredTaxLiabilitiesLeasingArrangements  
Other 22,160,000us-gaap_DeferredTaxLiabilitiesOther 18,494,000us-gaap_DeferredTaxLiabilitiesOther  
Total deferred tax liabilities 189,661,000us-gaap_DeferredIncomeTaxLiabilities 131,264,000us-gaap_DeferredIncomeTaxLiabilities  
Net deferred tax assets (liabilities) (7,229,000)us-gaap_DeferredTaxAssetsLiabilitiesNet 95,599,000us-gaap_DeferredTaxAssetsLiabilitiesNet  
Current income tax expense [Abstract]      
Federal 85,990,000us-gaap_CurrentFederalTaxExpenseBenefit 125,412,000us-gaap_CurrentFederalTaxExpenseBenefit 159,706,000us-gaap_CurrentFederalTaxExpenseBenefit
State 9,392,000us-gaap_CurrentStateAndLocalTaxExpenseBenefit 14,381,000us-gaap_CurrentStateAndLocalTaxExpenseBenefit 19,103,000us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Total current income tax expense 95,382,000us-gaap_CurrentIncomeTaxExpenseBenefit 139,793,000us-gaap_CurrentIncomeTaxExpenseBenefit 178,809,000us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred income tax expense [Abstract]      
Federal 36,521,000us-gaap_DeferredFederalIncomeTaxExpenseBenefit 15,915,000us-gaap_DeferredFederalIncomeTaxExpenseBenefit 8,664,000us-gaap_DeferredFederalIncomeTaxExpenseBenefit
State 2,949,000us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit 1,590,000us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit 1,267,000us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
Total deferred income tax expense 39,470,000us-gaap_DeferredIncomeTaxExpenseBenefit 17,505,000us-gaap_DeferredIncomeTaxExpenseBenefit 9,931,000us-gaap_DeferredIncomeTaxExpenseBenefit
Total income tax expense 134,852,000us-gaap_IncomeTaxExpenseBenefit 157,298,000us-gaap_IncomeTaxExpenseBenefit 188,740,000us-gaap_IncomeTaxExpenseBenefit
Effective Income Tax Rate Reconciliation, Amount [Abstract]      
Federal statutory tax 150,616,000us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate 166,680,000us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate 190,003,000us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
Tax exempt revenue (8,446,000)us-gaap_IncomeTaxReconciliationTaxExemptIncome (7,361,000)us-gaap_IncomeTaxReconciliationTaxExemptIncome (5,558,000)us-gaap_IncomeTaxReconciliationTaxExemptIncome
Effect of state income taxes, net of federal benefit 9,054,000us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes 10,937,000us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes 13,684,000us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Utilization of tax credits (11,107,000)us-gaap_IncomeTaxReconciliationTaxCredits (8,145,000)us-gaap_IncomeTaxReconciliationTaxCredits (5,126,000)us-gaap_IncomeTaxReconciliationTaxCredits
Bank-owned life insurance (3,183,000)us-gaap_IncomeTaxReconciliationDeductionsOther (3,596,000)us-gaap_IncomeTaxReconciliationDeductionsOther (3,850,000)us-gaap_IncomeTaxReconciliationDeductionsOther
Reduction of tax accrual (2,281,000)us-gaap_IncomeTaxReconciliationPriorYearIncomeTaxes (1,400,000)us-gaap_IncomeTaxReconciliationPriorYearIncomeTaxes (950,000)us-gaap_IncomeTaxReconciliationPriorYearIncomeTaxes
Other, net 199,000us-gaap_IncomeTaxReconciliationOtherAdjustments 183,000us-gaap_IncomeTaxReconciliationOtherAdjustments 537,000us-gaap_IncomeTaxReconciliationOtherAdjustments
Total income tax expense 134,852,000us-gaap_IncomeTaxExpenseBenefit 157,298,000us-gaap_IncomeTaxExpenseBenefit 188,740,000us-gaap_IncomeTaxExpenseBenefit
Effective Income Tax Rate Reconciliation, Percent [Abstract]      
Federal statutory tax (in hundredths) 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Tax exempt revenue (in hundredths) (2.00%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxExemptIncome (1.50%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxExemptIncome (1.00%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxExemptIncome
Effect of state income taxes, net of federal benefit (in hundredths) 2.10%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 2.30%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 2.50%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
Utilization of tax credits (in hundredths) (2.60%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCredits (1.70%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCredits (0.90%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCredits
Bank-owned life insurance (in hundredths) (0.70%)us-gaap_EffectiveIncomeTaxRateReconciliationDeductionsOther (0.80%)us-gaap_EffectiveIncomeTaxRateReconciliationDeductionsOther (0.70%)us-gaap_EffectiveIncomeTaxRateReconciliationDeductionsOther
Reduction of tax accrual (in hundredths) (0.50%)us-gaap_EffectiveIncomeTaxRateReconciliationPriorYearIncomeTaxes (0.30%)us-gaap_EffectiveIncomeTaxRateReconciliationPriorYearIncomeTaxes (0.10%)us-gaap_EffectiveIncomeTaxRateReconciliationPriorYearIncomeTaxes
Other, net (in hundredths) 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
Total (in hundredths) 31.30%us-gaap_EffectiveIncomeTaxRateContinuingOperations 33.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations 34.80%us-gaap_EffectiveIncomeTaxRateContinuingOperations
Tax accrual reduction 2,300,000bokf_TaxAccrualReduction 1,400,000bokf_TaxAccrualReduction  
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Balance as of January 1 12,058,000us-gaap_UnrecognizedTaxBenefits 12,275,000us-gaap_UnrecognizedTaxBenefits 12,230,000us-gaap_UnrecognizedTaxBenefits
Additions for tax for current year positions 3,813,000us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions 2,730,000us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions 3,976,000us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions
Settlements during the period 0us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities 0us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities (1,000,000)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities
Lapses of applicable statute of limitations (2,497,000)us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations (2,947,000)us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations (2,931,000)us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations
Balance as of December 31 13,374,000us-gaap_UnrecognizedTaxBenefits 12,058,000us-gaap_UnrecognizedTaxBenefits 12,275,000us-gaap_UnrecognizedTaxBenefits
Unrecognized Tax Benefits that Would Impact Effective Tax Rate 8,700,000us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate    
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense 1,500,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense 1,200,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense 1,200,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense
Unrecognized Tax Benefits, Penalties and Interest Accrued $ 3,600,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued $ 2,900,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued  
Unrecognized Tax Benefits, Number of Reporting Periods Open for Examination, Federal 3 years    
Unrecognized Tax Benefits, Number of Reporting Periods Open for Examination, State, Minimum 3 years    
Unrecognized Tax Benefits, Number of Reporting Periods Open for Examination, State, Maximum 6 years