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Mortgage Banking Activities Mortgage Banking Activities, Loans Serviced for Others (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Financing Receivable, Recorded Investment, Aging [Abstract]  
Mortgage Loans Serviced For Others, Current $ 16,679,920bokf_LoansServicedForOthersCurrent
Mortgage Loans Serviced For Others, 30 To 59 Days Past Due 151,835bokf_LoansServicedForOthers30To59DaysPastDue
Mortgage Loans Serviced For Others, 60 To 89 Days Past Due 37,844bokf_LoansServicedForOthers60To89DaysPastDue
Mortgage Loans Serviced For Others, Greater Than 90 Days or More Past Due 67,529bokf_LoansServicedForOtherstEqualToGreaterThan90DaysPastDue
Mortgage Loans Serviced For Others 16,937,128bokf_LoansServicedForOthers
Federal Home Loan Mortgage Corporation Certificates and Obligations (FHLMC) [Member]  
Financing Receivable, Recorded Investment, Aging [Abstract]  
Mortgage Loans Serviced For Others, Current 5,537,828bokf_LoansServicedForOthersCurrent
/ bokf_AgingOfMortgageLoansServicedForOthersByInvestorAxis
= us-gaap_FederalHomeLoanMortgageCorporationCertificatesAndObligationsFHLMCMember
Mortgage Loans Serviced For Others, 30 To 59 Days Past Due 32,319bokf_LoansServicedForOthers30To59DaysPastDue
/ bokf_AgingOfMortgageLoansServicedForOthersByInvestorAxis
= us-gaap_FederalHomeLoanMortgageCorporationCertificatesAndObligationsFHLMCMember
Mortgage Loans Serviced For Others, 60 To 89 Days Past Due 6,789bokf_LoansServicedForOthers60To89DaysPastDue
/ bokf_AgingOfMortgageLoansServicedForOthersByInvestorAxis
= us-gaap_FederalHomeLoanMortgageCorporationCertificatesAndObligationsFHLMCMember
Mortgage Loans Serviced For Others, Greater Than 90 Days or More Past Due 30,562bokf_LoansServicedForOtherstEqualToGreaterThan90DaysPastDue
/ bokf_AgingOfMortgageLoansServicedForOthersByInvestorAxis
= us-gaap_FederalHomeLoanMortgageCorporationCertificatesAndObligationsFHLMCMember
Mortgage Loans Serviced For Others 5,607,498bokf_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 5,451,497bokf_LoansServicedForOthersCurrent
/ bokf_AgingOfMortgageLoansServicedForOthersByInvestorAxis
= us-gaap_FederalNationalMortgageAssociationCertificatesAndObligationsFNMAMember
Mortgage Loans Serviced For Others, 30 To 59 Days Past Due 22,071bokf_LoansServicedForOthers30To59DaysPastDue
/ bokf_AgingOfMortgageLoansServicedForOthersByInvestorAxis
= us-gaap_FederalNationalMortgageAssociationCertificatesAndObligationsFNMAMember
Mortgage Loans Serviced For Others, 60 To 89 Days Past Due 4,039bokf_LoansServicedForOthers60To89DaysPastDue
/ bokf_AgingOfMortgageLoansServicedForOthersByInvestorAxis
= us-gaap_FederalNationalMortgageAssociationCertificatesAndObligationsFNMAMember
Mortgage Loans Serviced For Others, Greater Than 90 Days or More Past Due 21,575bokf_LoansServicedForOtherstEqualToGreaterThan90DaysPastDue
/ bokf_AgingOfMortgageLoansServicedForOthersByInvestorAxis
= us-gaap_FederalNationalMortgageAssociationCertificatesAndObligationsFNMAMember
Mortgage Loans Serviced For Others 5,499,182bokf_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 5,054,047bokf_LoansServicedForOthersCurrent
/ bokf_AgingOfMortgageLoansServicedForOthersByInvestorAxis
= us-gaap_GovernmentNationalMortgageAssociationCertificatesAndObligationsGNMAMember
Mortgage Loans Serviced For Others, 30 To 59 Days Past Due 91,424bokf_LoansServicedForOthers30To59DaysPastDue
/ bokf_AgingOfMortgageLoansServicedForOthersByInvestorAxis
= us-gaap_GovernmentNationalMortgageAssociationCertificatesAndObligationsGNMAMember
Mortgage Loans Serviced For Others, 60 To 89 Days Past Due 25,581bokf_LoansServicedForOthers60To89DaysPastDue
/ bokf_AgingOfMortgageLoansServicedForOthersByInvestorAxis
= us-gaap_GovernmentNationalMortgageAssociationCertificatesAndObligationsGNMAMember
Mortgage Loans Serviced For Others, Greater Than 90 Days or More Past Due 10,998bokf_LoansServicedForOtherstEqualToGreaterThan90DaysPastDue
/ bokf_AgingOfMortgageLoansServicedForOthersByInvestorAxis
= us-gaap_GovernmentNationalMortgageAssociationCertificatesAndObligationsGNMAMember
Mortgage Loans Serviced For Others 5,182,050bokf_LoansServicedForOthers
/ bokf_AgingOfMortgageLoansServicedForOthersByInvestorAxis
= us-gaap_GovernmentNationalMortgageAssociationCertificatesAndObligationsGNMAMember
Other Investor Loans [Member]  
Financing Receivable, Recorded Investment, Aging [Abstract]  
Mortgage Loans Serviced For Others, Current 636,548bokf_LoansServicedForOthersCurrent
/ bokf_AgingOfMortgageLoansServicedForOthersByInvestorAxis
= bokf_OtherInvestorLoansMember
Mortgage Loans Serviced For Others, 30 To 59 Days Past Due 6,021bokf_LoansServicedForOthers30To59DaysPastDue
/ bokf_AgingOfMortgageLoansServicedForOthersByInvestorAxis
= bokf_OtherInvestorLoansMember
Mortgage Loans Serviced For Others, 60 To 89 Days Past Due 1,435bokf_LoansServicedForOthers60To89DaysPastDue
/ bokf_AgingOfMortgageLoansServicedForOthersByInvestorAxis
= bokf_OtherInvestorLoansMember
Mortgage Loans Serviced For Others, Greater Than 90 Days or More Past Due 4,394bokf_LoansServicedForOtherstEqualToGreaterThan90DaysPastDue
/ bokf_AgingOfMortgageLoansServicedForOthersByInvestorAxis
= bokf_OtherInvestorLoansMember
Mortgage Loans Serviced For Others $ 648,398bokf_LoansServicedForOthers
/ bokf_AgingOfMortgageLoansServicedForOthersByInvestorAxis
= bokf_OtherInvestorLoansMember