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Other Borrowed Funds Other Borrowed Funds (Tables) | 12 Months Ended
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Dec. 31, 2021
Debt Disclosure [Abstract] |
Schedule of Other Borrowed Funds [Table Text Block] | Information relating to other borrowings is summarized as follows (dollars in thousands):
|  | As of |  | Year Ended
|  | December 31, 2021 |  | December 31, 2021
|  | Balance |  | Rate |  | Average Balance |  | Rate |  | Maximum Outstanding At Any Month End
Funds purchased |  | $ | 199,513 |  |  | 0.05 | % |  | $ | 543,183 |  |  | 0.46 | % |  | $ | 542,465 |
Repurchase agreements |  | 2,126,936 |  |  | 0.08 | % |  | 1,695,519 |  |  | 0.33 | % |  | 2,920,728 |
Other borrowings: |  |  |  |  |  |  |  |  |  |
Federal Home Loan Bank advances |  | — |  |  | — | % |  | 1,679,315 |  |  | 0.27 | % |  | 2,600,000 |
GNMA repurchase liability |  | 7,420 |  |  | 4.36 | % |  | 11,956 |  |  | 4.06 | % |  | 23,856 |
Paycheck protection program liquidity facility |  | — |  |  | — | % |  | 879,145 |  |  | 0.35 | % |  | 1,662,598 |
Other |  | 29,333 |  |  | 3.23 | % |  | 29,445 |  |  | 4.18 | % |  | 31,875 |
Total other borrowings |  | 36,753 |  |  |  |  | 2,599,861 |  |  | 0.38 | % |  |
Subordinated debentures 1 |  | 131,226 |  |  | 3.95 | % |  | 224,058 |  |  | 4.70 | % |  | 276,049 |
Total other borrowed funds |  | $ | 2,494,428 |  |  |  |  | $ | 5,062,621 |  |  | 0.56 | % |  |
|  | As of |  | Year Ended
|  | December 31, 2020 |  | December 31, 2020
|  | Balance |  | Rate |  | Average Balance |  | Rate |  | Maximum Outstanding At Any Month End
Funds purchased |  | $ | 769,365 |  |  | 0.05 | % |  | $ | 2,045,795 |  |  | 0.58 | % |  | $ | 3,311,938 |
Repurchase agreements |  | 893,021 |  |  | 0.09 | % |  | 1,589,746 |  |  | 0.24 | % |  | 3,230,097 |
Other borrowings: |  |  |  |  |  |  |  |  |  |
Federal Home Loan Bank advances |  | 200,000 |  |  | 0.29 | % |  | 3,393,989 |  |  | 1.00 | % |  | 7,500,000 |
GNMA repurchase liability |  | 19,500 |  |  | 4.35 | % |  | 42,771 |  |  | 4.18 | % |  | 126,569 |
Federal Reserve Bank advances |  | — |  |  | — | % |  | 42,464 |  |  | 0.26 | % |  | — |
Paycheck protection program liquidity facility |  | 1,635,963 |  |  | 0.35 | % |  | 1,152,073 |  |  | 0.35 | % |  | 2,013,414 |
Other |  | 27,507 |  |  | 5.24 | % |  | 28,156 |  |  | 5.12 | % |  | 49,376 |
Total other borrowings |  | 1,882,970 |  |  |  |  | 4,659,453 |  |  | 0.88 | % |  |
Subordinated debentures 1 |  | 276,005 |  |  | 4.72 | % |  | 275,965 |  |  | 5.05 | % |  | 276,005 |
Total other borrowed funds |  | $ | 3,821,361 |  |  |  |  | $ | 8,570,959 |  |  | 0.82 | % |  |
|  | As of |  | Year Ended
|  | December 31, 2019 |  | December 31, 2019
|  | Balance |  | Rate |  | Average Balance |  | Rate |  | Maximum Outstanding At Any Month End
Funds purchased |  | $ | 3,390,528 |  |  | 1.53 | % |  | $ | 2,438,376 |  |  | 2.08 | % |  | $ | 3,390,528 |
Repurchase agreements |  | 427,822 |  |  | 0.50 | % |  | 399,785 |  |  | 0.57 | % |  | 427,822 |
Other borrowings: |  |  |  |  |  |  |  |  |  |
Federal Home Loan Bank advances |  | 4,500,000 |  |  | 1.79 | % |  | 7,122,466 |  |  | 2.44 | % |  | 8,000,000 |
GNMA repurchase liability |  | 15,417 |  |  | 4.32 | % |  | 13,746 |  |  | 4.47 | % |  | 19,581 |
Other |  | 11,638 |  |  | 5.09 | % |  | 11,144 |  |  | 5.30 | % |  | 34,676 |
Total other borrowings |  | 4,527,055 |  |  |  |  | 7,147,356 |  |  | 2.45 | % |  |
Subordinated debentures 1 |  | 275,923 |  |  | 5.15 | % |  | 276,075 |  |  | 5.47 | % |  | 275,923 |
Total other borrowed funds |  | $ | 8,621,328 |  |  |  |  | $ | 10,261,592 |  |  | 2.37 | % |  |
Schedule of Maturities of Other Borrowed Funds [Table Text Block] | Aggregate annual principal repayments at December 31, 2021 are as follows (in thousands):
2022 |  |  |  | $ | 2,343,341 |
2023 |  |  |  | 3,378 |
2024 |  |  |  | 3,498 |
2025 |  |  |  | 3,622 |
2026 |  |  |  | 3,752 |
Thereafter |  |  |  | 136,837 |
Total |  |  |  | $ | 2,494,428 |
Schedule of Repurchase Agreements [Table Text Block] | Additional information relating to securities sold under agreements to repurchase and related liabilities at December 31, 2021 and 2020 is as follows (dollars in thousands):
|  | December 31, 2021
|  | Amortized |  | Fair |  | Repurchase |  |
Security Sold/Maturity |  | Cost |  | Value |  | Liability 1 |  | Rate
U.S. government agency mortgage-backed securities: |  |  |  |  |  |  |  |
Overnight 1 |  | $ | 907,154 |  |  | $ | 902,507 |  |  | $ | 884,936 |  |  | 0.08 | %
Less than 30 days 2 |  | N/A |  | 1,242,000 |  |  | 1,242,000 |  |  | 1.50 | %
Total Agency Securities |  | $ | 907,154 |  |  | $ | 2,144,507 |  |  | $ | 2,126,936 |  |  | 1.58 | %
|  | December 31, 2020
|  | Amortized |  | Fair |  | Repurchase |  |
Security Sold/Maturity |  | Cost |  | Value |  | Liability 1 |  | Rate
U.S. government agency mortgage-backed securities: |  |  |  |  |  |  |  |
Overnight 1 |  | $ | 893,069 |  |  | $ | 910,885 |  |  | $ | 893,021 |  |  | 0.09 | %
Less than 30 days |  | — |  |  | — |  |  | — |  |  | — | %
Total Agency Securities |  | $ | 893,069 |  |  | $ | 910,885 |  |  | $ | 893,021 |  |  | 0.09 | %
1 BOK Financial maintains control over the securities underlying overnight repurchase agreements and generally transfers control over securities underlying longer-term dealer repurchase agreements to the respective counterparty. 2 Trading position.

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