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Mortgage Banking Activities Mortgage Banking Activities, Loans Serviced for Others (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Financing Receivable, Recorded Investment, Aging [Abstract]  
Mortgage Loans Serviced For Others, Current $ 15,832,249bokf_LoansServicedForOthersCurrent
Mortgage Loans Serviced For Others, 30 To 59 Days Past Due 204,324bokf_LoansServicedForOthers30To59DaysPastDue
Mortgage Loans Serviced For Others, 60 To 89 Days Past Due 51,247bokf_LoansServicedForOthers60To89DaysPastDue
Mortgage Loans Serviced For Others, Greater Than 90 Days or More Past Due 75,067bokf_LoansServicedForOtherstEqualToGreaterThan90DaysPastDue
Mortgage Loans Serviced For Others 16,162,887bokf_LoansServicedForOthers
Federal Home Loan Mortgage Corporation Certificates and Obligations (FHLMC) [Member]  
Financing Receivable, Recorded Investment, Aging [Abstract]  
Mortgage Loans Serviced For Others, Current 5,289,078bokf_LoansServicedForOthersCurrent
/ bokf_AgingOfMortgageLoansServicedForOthersByInvestorAxis
= us-gaap_FederalHomeLoanMortgageCorporationCertificatesAndObligationsFHLMCMember
Mortgage Loans Serviced For Others, 30 To 59 Days Past Due 37,881bokf_LoansServicedForOthers30To59DaysPastDue
/ bokf_AgingOfMortgageLoansServicedForOthersByInvestorAxis
= us-gaap_FederalHomeLoanMortgageCorporationCertificatesAndObligationsFHLMCMember
Mortgage Loans Serviced For Others, 60 To 89 Days Past Due 9,418bokf_LoansServicedForOthers60To89DaysPastDue
/ bokf_AgingOfMortgageLoansServicedForOthersByInvestorAxis
= us-gaap_FederalHomeLoanMortgageCorporationCertificatesAndObligationsFHLMCMember
Mortgage Loans Serviced For Others, Greater Than 90 Days or More Past Due 33,837bokf_LoansServicedForOtherstEqualToGreaterThan90DaysPastDue
/ bokf_AgingOfMortgageLoansServicedForOthersByInvestorAxis
= us-gaap_FederalHomeLoanMortgageCorporationCertificatesAndObligationsFHLMCMember
Mortgage Loans Serviced For Others 5,370,214bokf_LoansServicedForOthers
/ bokf_AgingOfMortgageLoansServicedForOthersByInvestorAxis
= us-gaap_FederalHomeLoanMortgageCorporationCertificatesAndObligationsFHLMCMember
Federal National Mortgage Association Certificates and Obligations (FNMA) [Member]  
Financing Receivable, Recorded Investment, Aging [Abstract]  
Mortgage Loans Serviced For Others, Current 5,200,509bokf_LoansServicedForOthersCurrent
/ bokf_AgingOfMortgageLoansServicedForOthersByInvestorAxis
= us-gaap_FederalNationalMortgageAssociationCertificatesAndObligationsFNMAMember
Mortgage Loans Serviced For Others, 30 To 59 Days Past Due 27,089bokf_LoansServicedForOthers30To59DaysPastDue
/ bokf_AgingOfMortgageLoansServicedForOthersByInvestorAxis
= us-gaap_FederalNationalMortgageAssociationCertificatesAndObligationsFNMAMember
Mortgage Loans Serviced For Others, 60 To 89 Days Past Due 5,736bokf_LoansServicedForOthers60To89DaysPastDue
/ bokf_AgingOfMortgageLoansServicedForOthersByInvestorAxis
= us-gaap_FederalNationalMortgageAssociationCertificatesAndObligationsFNMAMember
Mortgage Loans Serviced For Others, Greater Than 90 Days or More Past Due 22,087bokf_LoansServicedForOtherstEqualToGreaterThan90DaysPastDue
/ bokf_AgingOfMortgageLoansServicedForOthersByInvestorAxis
= us-gaap_FederalNationalMortgageAssociationCertificatesAndObligationsFNMAMember
Mortgage Loans Serviced For Others 5,255,421bokf_LoansServicedForOthers
/ bokf_AgingOfMortgageLoansServicedForOthersByInvestorAxis
= us-gaap_FederalNationalMortgageAssociationCertificatesAndObligationsFNMAMember
Government National Mortgage Association Certificates and Obligations (GNMA) [Member]  
Financing Receivable, Recorded Investment, Aging [Abstract]  
Mortgage Loans Serviced For Others, Current 4,920,064bokf_LoansServicedForOthersCurrent
/ bokf_AgingOfMortgageLoansServicedForOthersByInvestorAxis
= us-gaap_GovernmentNationalMortgageAssociationCertificatesAndObligationsGNMAMember
Mortgage Loans Serviced For Others, 30 To 59 Days Past Due 132,680bokf_LoansServicedForOthers30To59DaysPastDue
/ bokf_AgingOfMortgageLoansServicedForOthersByInvestorAxis
= us-gaap_GovernmentNationalMortgageAssociationCertificatesAndObligationsGNMAMember
Mortgage Loans Serviced For Others, 60 To 89 Days Past Due 34,602bokf_LoansServicedForOthers60To89DaysPastDue
/ bokf_AgingOfMortgageLoansServicedForOthersByInvestorAxis
= us-gaap_GovernmentNationalMortgageAssociationCertificatesAndObligationsGNMAMember
Mortgage Loans Serviced For Others, Greater Than 90 Days or More Past Due 13,594bokf_LoansServicedForOtherstEqualToGreaterThan90DaysPastDue
/ bokf_AgingOfMortgageLoansServicedForOthersByInvestorAxis
= us-gaap_GovernmentNationalMortgageAssociationCertificatesAndObligationsGNMAMember
Mortgage Loans Serviced For Others 5,100,940bokf_LoansServicedForOthers
/ bokf_AgingOfMortgageLoansServicedForOthersByInvestorAxis
= us-gaap_GovernmentNationalMortgageAssociationCertificatesAndObligationsGNMAMember
Other Investor Loans [Member]  
Financing Receivable, Recorded Investment, Aging [Abstract]  
Mortgage Loans Serviced For Others, Current 422,598bokf_LoansServicedForOthersCurrent
/ bokf_AgingOfMortgageLoansServicedForOthersByInvestorAxis
= bokf_OtherInvestorLoansMember
Mortgage Loans Serviced For Others, 30 To 59 Days Past Due 6,674bokf_LoansServicedForOthers30To59DaysPastDue
/ bokf_AgingOfMortgageLoansServicedForOthersByInvestorAxis
= bokf_OtherInvestorLoansMember
Mortgage Loans Serviced For Others, 60 To 89 Days Past Due 1,491bokf_LoansServicedForOthers60To89DaysPastDue
/ bokf_AgingOfMortgageLoansServicedForOthersByInvestorAxis
= bokf_OtherInvestorLoansMember
Mortgage Loans Serviced For Others, Greater Than 90 Days or More Past Due 5,549bokf_LoansServicedForOtherstEqualToGreaterThan90DaysPastDue
/ bokf_AgingOfMortgageLoansServicedForOthersByInvestorAxis
= bokf_OtherInvestorLoansMember
Mortgage Loans Serviced For Others $ 436,312bokf_LoansServicedForOthers
/ bokf_AgingOfMortgageLoansServicedForOthersByInvestorAxis
= bokf_OtherInvestorLoansMember