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Related Parties Related Parties (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Directors and Senior Management [Member] |  |  |
Loans and Leases Receivable, Related Parties [Roll Forward] |  |  |
Beginning balance |  | $ 75,189 | $ 75,265
Advances |  | 498,425 | 886,610
Payments |  | (484,958) | (896,643)
Adjustments | [1] | 4,284 | 9,957
Ending balance |  | 92,940 | 75,189
Director [Member] |  |  |
Loan Commitments and Equity Investments [Abstract] |  |  |
Related Party Transaction, Expenses from Transactions with Related Party |  | $ 10,000 |
Executive Officer [Member] |  |  |
Loan Commitments and Equity Investments [Abstract] |  |  |
Percentage of investment funds' assets held by clients |  | 80.00% |
Assets Held in Cavanal Hill Funds |  | $ 3,700,000 |
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 |  | $ 416,000 |
Maximum loan commitments and equity investments to all affiliates |  | 832,000 |
Largest loan commitment and equity investment to a single affiliate |  | 264,000 |
Aggregate loan commitment and equity investment to all affiliates |  | 324,000 | 392,000
Outstanding amounts to all affiliates |  | 5,300 | $ 5,000
Largest amount outstanding to a single affiliate |  | $ 4,100 |
[1] | Adjustments generally consist of changes in status as a related party.

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- Definition The amount of largest loan commitment and equity investment to a single affiliate. + References No definition available. + Details
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- Definition The amount of maximum loan commitments and equity investments to a single affiliate. + References No definition available. + Details
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