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Goodwill and Intangible Assets Acquisitions (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Feb. 28, 2014
Apr. 30, 2014
Business Acquisition [Line Items]          
Business Acquisition, Purchase Price Allocation, Goodwill Amount $ 377,780,000us-gaap_Goodwill $ 359,759,000us-gaap_Goodwill $ 361,979,000us-gaap_Goodwill    
GTrust Financial Corporation [Member]          
Business Acquisition [Line Items]          
Assets Under Management at time of acquisition       631,000,000bokf_AssetsUnderManagementattimeofacquisition
/ us-gaap_BusinessAcquisitionAxis
= bokf_GTrustFinancialCorporationMember
 
MBM Advisors [Member]          
Business Acquisition [Line Items]          
Assets Under Management at time of acquisition         1,300,000,000bokf_AssetsUnderManagementattimeofacquisition
/ us-gaap_BusinessAcquisitionAxis
= bokf_MBMAdvisorsMember
Series of Individually Immaterial Business Acquisitions [Member]          
Business Acquisition [Line Items]          
Business Acquisition, Cost of Acquired Entity, Purchase Price 27,000,000us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember
       
Business Acquisition, Cost of Acquired Entity, Cash Paid 23,000,000us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember
       
Business Combination, Contingent Consideration, Liability 4,000,000us-gaap_BusinessCombinationContingentConsiderationLiability
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember
       
Business Acquisition, Purchase Price Allocation, Intangible Assets Other than Goodwill 14,000,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember
       
Business Acquisition, Purchase Price Allocation, Goodwill Amount $ 18,000,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember