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Commitments and Contingent Liabilities Variable Interest Entities (Details)
$ in Thousands
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
BOKF Equity, LLC [Member]    
Variable Interest Entity [Line Items]    
Number of Private Equity Funds of which the Entity is a General Partner 2  
Loans [Member]    
Variable Interest Entity [Line Items]    
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net $ 0 $ 10,000
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets and Liabilities, Net 58,981 52,852
Other Assets [Member]    
Variable Interest Entity [Line Items]    
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net 27,118 26,787
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets and Liabilities, Net 227,973 191,903
Other Liabilities [Member]    
Variable Interest Entity [Line Items]    
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net 1,448 0
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets and Liabilities, Net 73,885 70,827
Other Borrowings [Member]    
Variable Interest Entity [Line Items]    
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net 5,207 10,964
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets and Liabilities, Net 0 0
Non-Controlling Interests [Member]    
Variable Interest Entity [Line Items]    
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net 10,936 22,967
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets and Liabilities, Net 0 0
Private equity funds [Member] | Loans [Member]    
Variable Interest Entity [Line Items]    
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net 0 0
Private equity funds [Member] | Other Assets [Member]    
Variable Interest Entity [Line Items]    
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net 9,516 14,783
Private equity funds [Member] | Other Liabilities [Member]    
Variable Interest Entity [Line Items]    
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net 0 0
Private equity funds [Member] | Other Borrowings [Member]    
Variable Interest Entity [Line Items]    
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net 0 0
Private equity funds [Member] | Non-Controlling Interests [Member]    
Variable Interest Entity [Line Items]    
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net 8,644 11,927
Tax credit entities [Member] | Loans [Member]    
Variable Interest Entity [Line Items]    
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net 0 10,000
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets and Liabilities, Net 58,981 52,852
Tax credit entities [Member] | Other Assets [Member]    
Variable Interest Entity [Line Items]    
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net 0 10,964
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets and Liabilities, Net 165,567 153,506
Tax credit entities [Member] | Other Liabilities [Member]    
Variable Interest Entity [Line Items]    
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net 0 0
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets and Liabilities, Net 53,198 47,859
Tax credit entities [Member] | Other Borrowings [Member]    
Variable Interest Entity [Line Items]    
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net 0 10,964
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets and Liabilities, Net 0 0
Tax credit entities [Member] | Non-Controlling Interests [Member]    
Variable Interest Entity [Line Items]    
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net 0 10,000
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets and Liabilities, Net 0 0
Other [Member] | Loans [Member]    
Variable Interest Entity [Line Items]    
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net 0 0
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets and Liabilities, Net 0 0
Other [Member] | Other Assets [Member]    
Variable Interest Entity [Line Items]    
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net 17,602 1,040
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets and Liabilities, Net 62,406 38,397
Other [Member] | Other Liabilities [Member]    
Variable Interest Entity [Line Items]    
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net 1,448 0
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets and Liabilities, Net 20,687 22,968
Other [Member] | Other Borrowings [Member]    
Variable Interest Entity [Line Items]    
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net 5,207 0
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets and Liabilities, Net 0 0
Other [Member] | Non-Controlling Interests [Member]    
Variable Interest Entity [Line Items]    
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net 2,292 1,040
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets and Liabilities, Net $ 0 $ 0