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Related Parties Related Parties (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Directors and Senior Management [Member] |  |
Loans and Leases Receivable, Related Parties [Roll Forward] |  |
Beginning balance | $ 75,265 | $ 110,246
Advances | 886,610 | 1,479,735
Payments | (896,643) | (1,514,841)
Adjustments | 9,957 | 125
Ending balance | 75,189 | 75,265
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 | 84.00% |
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 | $ 370,000 |
Maximum loan commitments and equity investments to all affiliates | 739,000 |
Largest loan commitment and equity investment to a single affiliate | 257,000 |
Aggregate loan commitment and equity investment to all affiliates | 392,000 | 313,000
Outstanding amounts to all affiliates | 5,000 | $ 883
Largest amount outstanding to a single affiliate | $ 4,300 |

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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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- Definition The maximum percentage of unimpaired capital on loan commitments and equity investments to all affiliates. + References No definition available. + Details
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