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Related Parties Related Parties (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Directors and Senior Management [Member] |  |  |  |
Loans and Leases Receivable, Related Parties [Roll Forward] |  |  |  |
Beginning balance |  | $ 92,940 | $ 75,189 |
Advances |  | 588,252 | 498,425 |
Payments |  | (583,040) | (484,958) |
Adjustments | [1] | (2,933) | 4,284 |
Ending balance |  | 95,219 | 92,940 | $ 75,189
Director [Member] |  |  |  |
Loan Commitments and Equity Investments [Abstract] |  |  |  |
Related Party Transaction, Expenses from Transactions with Related Party |  | $ 10,400 | 10,000 | $ 10,000
Executive Officer [Member] |  |  |  |
Loan Commitments and Equity Investments [Abstract] |  |  |  |
Percentage of investment funds' assets held by clients |  | 81.00% |  |
Assets Held in Cavanal Hill Funds |  | $ 4,000,000 |  |
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 |  | 833,000 |  |
Largest loan commitment and equity investment to a single affiliate |  | 264,000 |  |
Aggregate loan commitment and equity investment to all affiliates |  | 324,000 | 324,000 |
Outstanding amounts to all affiliates |  | 5,000 | $ 5,300 |
Largest amount outstanding to a single affiliate |  | $ 4,000 |  |
[1] | Adjustments generally consist of changes in status as a related party.

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