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Related Parties Related Parties (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Loans and Leases Receivable, Related Parties [Roll Forward]      
Lease payments on office space in facilities owned by related party afffiliates $ 28,500 $ 27,500 $ 25,800
Commercial [Member] | Manufacturing [Member]      
Loans and Leases Receivable, Related Parties [Roll Forward]      
Impaired Affiliated Loans 4,700    
Directors and Senior Management [Member]      
Loans and Leases Receivable, Related Parties [Roll Forward]      
Beginning balance 110,246 136,945  
Advances 1,479,735 1,559,291  
Payments (1,514,841) (1,585,865)  
Adjustments [1] 125 (125)  
Ending balance 75,265 110,246 136,945
Board of Directors Chairman [Member]      
Loans and Leases Receivable, Related Parties [Roll Forward]      
Lease payments on office space in facilities owned by related party afffiliates 683 1,000 $ 1,100
Related Party Transaction, Amounts of Transaction 3,100 580  
Director [Member]      
Loans and Leases Receivable, Related Parties [Roll Forward]      
Related Party Transaction, Expenses from Transactions with Related Party $ 9,200    
Executive Officer [Member]      
Loans and Leases Receivable, Related Parties [Roll Forward]      
Percentage of investment funds' assets held by clients 89.00%    
Assets Held in Cavanal Hill Funds $ 3,400,000    
Subsidiaries [Member] | BOKF, NA [Member] | Affiliated Entity [Member]      
Loan Commitments and Equity Investments [Abstract]      
Maximum percentage of unimpaired capital on loan commitments and equity investments to a single affiliate (in hundredths) 10.00%    
Maximum percentage of unimpaired capital on loan commitments and equity investments to all affiliates (in hundredths) 20.00%    
Maximum loan commitments and equity investments to a single affiliate $ 310,000    
Maximum loan commitments and equity investments to all affiliates 621,000    
Largest loan commitment and equity investment to a single affiliate 253,000    
Aggregate loan commitment and equity investment to all affiliates 313,000 323,000  
Outstanding amounts to all affiliates 883 $ 16,000  
Largest amount outstanding to a single affiliate $ 883    
[1] Adjustments generally consist of changes in status as a related party.