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Other Borrowed Funds Other Borrowed Funds (Tables) | 12 Months Ended
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Dec. 31, 2019
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, 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 | % |  |
|  | As of |  | Year Ended
|  | December 31, 2018 |  | December 31, 2018
|  | Balance |  | Rate |  | Average Balance |  | Rate |  | Maximum Outstanding At Any Month End
Funds purchased |  | 402,450 |  |  | 2.34 | % |  | 419,322 |  |  | 1.89 | % |  | 949,531 |
Repurchase agreements |  | 615,961 |  |  | 0.36 | % |  | 464,582 |  |  | 0.28 | % |  | 615,961 |
Other borrowings: |  |  |  |  |  |  |  |  |  |
Federal Home Loan Bank advances |  | 6,100,000 |  |  | 2.65 | % |  | 6,207,142 |  |  | 2.06 | % |  | 6,500,000 |
GNMA repurchase liability |  | 15,552 |  |  | 4.43 | % |  | 14,783 |  |  | 4.47 | % |  | 16,529 |
Other |  | 8,838 |  |  | 2.90 | % |  | 14,516 |  |  | 2.67 | % |  | 20,422 |
Total other borrowings |  | 6,124,390 |  |  |  |  | 6,236,441 |  |  | 2.07 | % |  |
Subordinated debentures 1 |  | 275,913 |  |  | 5.34 | % |  | 177,884 |  |  | 5.52 | % |  | 275,913 |
Total other borrowed funds |  | $ | 7,418,714 |  |  |  |  | $ | 7,298,229 |  |  | 2.03 | % |  |
|  | As of |  | Year Ended
|  | December 31, 2017 |  | December 31, 2017
|  | Balance |  | Rate |  | Average Balance |  | Rate |  | Maximum Outstanding At Any Month End
Funds purchased |  | 58,628 |  |  | 1.00 | % |  | 58,064 |  |  | 0.73 | % |  | 80,967 |
Repurchase agreements |  | 516,335 |  |  | 0.17 | % |  | 433,791 |  |  | 0.10 | % |  | 536,094 |
Other borrowings: |  |  |  |  |  |  |  |  |  |
Federal Home Loan Bank advances |  | 5,100,000 |  |  | 1.47 | % |  | 5,882,466 |  |  | 1.13 | % |  | 6,200,000 |
GNMA repurchase liability |  | 19,947 |  |  | 4.22 | % |  | 20,509 |  |  | 4.59 | % |  | 24,139 |
Other |  | 14,950 |  |  | 2.61 | % |  | 16,317 |  |  | 3.35 | % |  | 18,610 |
Total other borrowings |  | 5,134,897 |  |  |  |  | 5,919,292 |  |  | 1.15 | % |  |
Subordinated debentures 1 |  | 144,677 |  |  | 5.60 | % |  | 147,954 |  |  | 5.57 | % |  | 151,875 |
Total other borrowed funds |  | $ | 5,854,537 |  |  |  |  | $ | 6,559,101 |  |  | 1.18 | % |  |
Schedule of Maturities of Other Borrowed Funds [Table Text Block] | Aggregate annual principal repayments at December 31, 2019 are as follows (in thousands):
2020 |  | $ | 8,335,742 |
2021 |  | 1,244 |
2022 |  | 575 |
2023 |  | 1,454 |
2024 |  | 3,599 |
Thereafter |  | 278,714 |
Total |  | $ | 8,621,328 |
Schedule of Repurchase Agreements [Table Text Block] | Additional information relating to securities sold under agreements to repurchase and related liabilities at December 31, 2019 and 2018 is as follows (dollars in thousands):
|  | December 31, 2019
|  | Amortized |  | Fair |  | Repurchase |  |
Security Sold/Maturity |  | Cost |  | Value |  | Liability 1 |  | Rate
U.S. government agency mortgage-backed securities: |  |  |  |  |  |  |  |
Overnight 1 |  | $ | 431,939 |  |  | $ | 435,898 |  |  | $ | 427,822 |  |  | 0.50 | %
Long-term |  | — |  |  | — |  |  | — |  |  | — | %
Total Agency Securities |  | $ | 431,939 |  |  | $ | 435,898 |  |  | $ | 427,822 |  |  | 0.50 | %
|  | December 31, 2018
|  | Amortized |  | Fair |  | Repurchase |  |
Security Sold/Maturity |  | Cost |  | Value |  | Liability 1 |  | Rate
U.S. government agency mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |
Overnight 1 |  | $ | 636,864 |  |  | $ | 628,229 |  |  | $ | 615,961 |  |  | 0.36 | %
Long-term |  | — |  |  | — |  |  | — |  |  | — | %
Total Agency Securities |  | $ | 636,864 |  |  | $ | 628,229 |  |  | $ | 615,961 |  |  | 0.36 | %
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.

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- Definition Tabular disclosure of the combined aggregate amount of maturities and sinking fund requirements for all long-term borrowings for each of the five years following the date of the latest balance sheet date presented. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 + Details
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