XML 63 R94.htm IDEA: XBRL DOCUMENT v2.4.1.9
Fair Value Measurements Fair Value Measurements, Financial Instruments, Quantitative Information (Details)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Loans [Member] | Commercial [Member]    
Fair Value Inputs, Financial Instruments, Quantitative Information [Line Items]    
Contractual Yield, Minimum 0.17%bokf_FinancialInstrumentsContractualYieldRangeMinimum
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_LoansReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember		 0.04%bokf_FinancialInstrumentsContractualYieldRangeMinimum
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_LoansReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
Contractual Yield, Maximum 30.00%bokf_FinancialInstrumentsContractualYieldRangeMaximum
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_LoansReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember		 30.00%bokf_FinancialInstrumentsContractualYieldRangeMaximum
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_LoansReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
Repricing (in years) 7 months 23 days 5 months 26 days
Discount Rate, Minimum 0.51%bokf_FairValueMeasurementsFinancialInstrumentsDiscountRateRangeMinimum
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_LoansReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember		 0.48%bokf_FairValueMeasurementsFinancialInstrumentsDiscountRateRangeMinimum
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_LoansReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
Discount Rate, Maximum 4.34%bokf_FairValueMeasurementsFinancialInstrumentsDiscountRateRangeMaximum
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_LoansReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember		 4.33%bokf_FairValueMeasurementsFinancialInstrumentsDiscountRateRangeMaximum
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_LoansReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
Loans [Member] | Commercial Real Estate [Member]    
Fair Value Inputs, Financial Instruments, Quantitative Information [Line Items]    
Contractual Yield, Minimum 0.38%bokf_FinancialInstrumentsContractualYieldRangeMinimum
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_LoansReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember		 0.38%bokf_FinancialInstrumentsContractualYieldRangeMinimum
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_LoansReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
Contractual Yield, Maximum 18.00%bokf_FinancialInstrumentsContractualYieldRangeMaximum
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_LoansReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember		 18.00%bokf_FinancialInstrumentsContractualYieldRangeMaximum
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_LoansReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
Repricing (in years) 10 months 3 days 9 months 10 days
Discount Rate, Minimum 1.09%bokf_FairValueMeasurementsFinancialInstrumentsDiscountRateRangeMinimum
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_LoansReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember		 1.21%bokf_FairValueMeasurementsFinancialInstrumentsDiscountRateRangeMinimum
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_LoansReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
Discount Rate, Maximum 3.78%bokf_FairValueMeasurementsFinancialInstrumentsDiscountRateRangeMaximum
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_LoansReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember		 3.49%bokf_FairValueMeasurementsFinancialInstrumentsDiscountRateRangeMaximum
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_LoansReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
Loans [Member] | Residential Portfolio Segment [Member]    
Fair Value Inputs, Financial Instruments, Quantitative Information [Line Items]    
Contractual Yield, Minimum 1.20%bokf_FinancialInstrumentsContractualYieldRangeMinimum
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_LoansReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember		 0.38%bokf_FinancialInstrumentsContractualYieldRangeMinimum
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_LoansReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember
Contractual Yield, Maximum 18.00%bokf_FinancialInstrumentsContractualYieldRangeMaximum
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_LoansReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember		 18.00%bokf_FinancialInstrumentsContractualYieldRangeMaximum
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_LoansReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember
Repricing (in years) 2 years 6 months 2 years 7 months 16 days
Discount Rate, Minimum 0.64%bokf_FairValueMeasurementsFinancialInstrumentsDiscountRateRangeMinimum
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_LoansReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember		 0.59%bokf_FairValueMeasurementsFinancialInstrumentsDiscountRateRangeMinimum
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_LoansReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember
Discount Rate, Maximum 3.99%bokf_FairValueMeasurementsFinancialInstrumentsDiscountRateRangeMaximum
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_LoansReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember		 4.73%bokf_FairValueMeasurementsFinancialInstrumentsDiscountRateRangeMaximum
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_LoansReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember
Loans [Member] | Consumer Portfolio Segment [Member]    
Fair Value Inputs, Financial Instruments, Quantitative Information [Line Items]    
Contractual Yield, Minimum 0.38%bokf_FinancialInstrumentsContractualYieldRangeMinimum
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_LoansReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember		 0.38%bokf_FinancialInstrumentsContractualYieldRangeMinimum
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_LoansReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember
Contractual Yield, Maximum 21.00%bokf_FinancialInstrumentsContractualYieldRangeMaximum
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_LoansReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember		 21.00%bokf_FinancialInstrumentsContractualYieldRangeMaximum
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_LoansReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember
Repricing (in years) 5 months 12 days 6 months 18 days
Discount Rate, Minimum 1.04%bokf_FairValueMeasurementsFinancialInstrumentsDiscountRateRangeMinimum
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_LoansReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember		 1.22%bokf_FairValueMeasurementsFinancialInstrumentsDiscountRateRangeMinimum
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_LoansReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember
Discount Rate, Maximum 3.98%bokf_FairValueMeasurementsFinancialInstrumentsDiscountRateRangeMaximum
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_LoansReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember		 3.75%bokf_FairValueMeasurementsFinancialInstrumentsDiscountRateRangeMaximum
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_LoansReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember
Time Deposits [Member]    
Fair Value Inputs, Financial Instruments, Quantitative Information [Line Items]    
Contractual Yield, Minimum 0.02%bokf_FinancialInstrumentsContractualYieldRangeMinimum
/ us-gaap_FairValueByLiabilityClassAxis
= bokf_TimeDepositsMember		 0.01%bokf_FinancialInstrumentsContractualYieldRangeMinimum
/ us-gaap_FairValueByLiabilityClassAxis
= bokf_TimeDepositsMember
Contractual Yield, Maximum 9.64%bokf_FinancialInstrumentsContractualYieldRangeMaximum
/ us-gaap_FairValueByLiabilityClassAxis
= bokf_TimeDepositsMember		 9.64%bokf_FinancialInstrumentsContractualYieldRangeMaximum
/ us-gaap_FairValueByLiabilityClassAxis
= bokf_TimeDepositsMember
Repricing (in years) 1 year 11 months 1 day 2 years 1 month 12 days
Discount Rate, Minimum 0.76%bokf_FairValueMeasurementsFinancialInstrumentsDiscountRateRangeMinimum
/ us-gaap_FairValueByLiabilityClassAxis
= bokf_TimeDepositsMember		 0.75%bokf_FairValueMeasurementsFinancialInstrumentsDiscountRateRangeMinimum
/ us-gaap_FairValueByLiabilityClassAxis
= bokf_TimeDepositsMember
Discount Rate, Maximum 1.33%bokf_FairValueMeasurementsFinancialInstrumentsDiscountRateRangeMaximum
/ us-gaap_FairValueByLiabilityClassAxis
= bokf_TimeDepositsMember		 1.33%bokf_FairValueMeasurementsFinancialInstrumentsDiscountRateRangeMaximum
/ us-gaap_FairValueByLiabilityClassAxis
= bokf_TimeDepositsMember
Other borrowings [Member]    
Fair Value Inputs, Financial Instruments, Quantitative Information [Line Items]    
Contractual Yield, Minimum 0.21%bokf_FinancialInstrumentsContractualYieldRangeMinimum
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_BorrowingsMember		 0.25%bokf_FinancialInstrumentsContractualYieldRangeMinimum
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_BorrowingsMember
Contractual Yield, Maximum 1.52%bokf_FinancialInstrumentsContractualYieldRangeMaximum
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_BorrowingsMember		 4.78%bokf_FinancialInstrumentsContractualYieldRangeMaximum
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_BorrowingsMember
Repricing (in years) 1 month 12 days 10 days
Discount Rate, Minimum 0.06%bokf_FairValueMeasurementsFinancialInstrumentsDiscountRateRangeMinimum
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_BorrowingsMember		 0.08%bokf_FairValueMeasurementsFinancialInstrumentsDiscountRateRangeMinimum
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_BorrowingsMember
Discount Rate, Maximum 2.64%bokf_FairValueMeasurementsFinancialInstrumentsDiscountRateRangeMaximum
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_BorrowingsMember		 2.64%bokf_FairValueMeasurementsFinancialInstrumentsDiscountRateRangeMaximum
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_BorrowingsMember
Subordinated debentures [Member]    
Fair Value Inputs, Financial Instruments, Quantitative Information [Line Items]    
Contractual Yield, Minimum 0.92%bokf_FinancialInstrumentsContractualYieldRangeMinimum
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_SubordinatedDebtObligationsMember		 0.95%bokf_FinancialInstrumentsContractualYieldRangeMinimum
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_SubordinatedDebtObligationsMember
Contractual Yield, Maximum 5.00%bokf_FinancialInstrumentsContractualYieldRangeMaximum
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_SubordinatedDebtObligationsMember		 5.00%bokf_FinancialInstrumentsContractualYieldRangeMaximum
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_SubordinatedDebtObligationsMember
Repricing (in years) 1 year 8 months 1 day 2 years 7 months 16 days
Discount Rate, Minimum 2.14%bokf_FairValueMeasurementsFinancialInstrumentsDiscountRateRangeMinimum
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_SubordinatedDebtObligationsMember		  
Discount Rate, Maximum 2.14%bokf_FairValueMeasurementsFinancialInstrumentsDiscountRateRangeMaximum
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_SubordinatedDebtObligationsMember		 2.22%bokf_FairValueMeasurementsFinancialInstrumentsDiscountRateRangeMaximum
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_SubordinatedDebtObligationsMember