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Shareholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2023
Stockholders' Equity Note [Abstract] |
Summary of Regulatory Capital Levels [Table Text Block] | A summary of regulatory capital minimum requirements and levels follows (dollars in thousands):
|  | Minimum Capital Requirement |  | Capital Conservation Buffer |  | Minimum Capital Requirement Including Capital Conservation Buffer |  | Well Capitalized Bank Requirement |  | December 31, 2023 |  | December 31, 2022
Common Equity Tier 1 Capital (to Risk Weighted Assets): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated |  | 4.50% |  | 2.50% |  | 7.00% |  | N/A |  | $ | 4,683,510 |  |  | 12.06 | % |  | $ | 4,460,054 |  |  | 11.69 | %
BOKF, NA |  | 4.50% |  | N/A |  | 4.50% |  | 6.50% |  | 4,370,891 |  |  | 11.37 | % |  | 4,176,978 |  |  | 11.05 | %
Tier I Capital (to Risk Weighted Assets): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated |  | 6.00% |  | 2.50% |  | 8.50% |  | N/A |  | $ | 4,686,487 |  |  | 12.07 | % |  | $ | 4,464,763 |  |  | 11.71 | %
BOKF, NA |  | 6.00% |  | N/A |  | 6.00% |  | 8.00% |  | 4,370,891 |  |  | 11.37 | % |  | 4,178,531 |  |  | 11.06 | %
Total Capital (to Risk Weighted Assets): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated |  | 8.00% |  | 2.50% |  | 10.50% |  | N/A |  | $ | 5,110,471 |  |  | 13.16 | % |  | $ | 4,830,827 |  |  | 12.67 | %
BOKF, NA |  | 8.00% |  | N/A |  | 8.00% |  | 10.00% |  | 4,728,876 |  |  | 12.30 | % |  | 4,478,559 |  |  | 11.85 | %
Leverage (Tier I Capital to Average Assets): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated |  | 4.00% |  | N/A |  | 4.00% |  | N/A |  | $ | 4,686,487 |  |  | 9.45 | % |  | $ | 4,464,763 |  |  | 9.91 | %
BOKF, NA |  | 4.00% |  | N/A |  | 4.00% |  | 5.00% |  | 4,370,891 |  |  | 8.86 | % |  | 4,178,531 |  |  | 9.31 | %
Accumulated Other Comprehensive Income (Loss) [Table Text Block] | A rollforward of the components of accumulated other comprehensive income (loss) is included as follows (in thousands):
| Unrealized Gain (Loss) on |  |  |  |
| Available for Sale Securities |  | Investment Securities Transferred from AFS |  | Employee Benefit Plans |  |  |  | Total
Balance, December 31, 2020 | $ | 335,032 |  |  | $ | — |  |  | $ | 836 |  |  |  |  | $ | 335,868 |
Net change in unrealized gain (loss) | (343,730) |  |  | — |  |  | 2,361 |  |  |  |  | (341,369) |
Reclassification adjustments included in earnings: |  |  |  |  |  |  |  |  |
Gain on available for sale securities, net | (3,704) |  |  | — |  |  | — |  |  |  |  | (3,704) |
Other comprehensive income (loss), before income taxes | (347,434) |  |  | — |  |  | 2,361 |  |  |  |  | (345,073) |
Federal and state income tax | (82,177) |  |  | — |  |  | 601 |  |  |  |  | (81,576) |
Other comprehensive income (loss), net of income taxes | (265,257) |  |  | — |  |  | 1,760 |  |  |  |  | (263,497) |
Balance, December 31, 2021 | 69,775 |  |  | — |  |  | 2,596 |  |  |  |  | 72,371 |
Net change in unrealized gain (loss) | (1,227,414) |  |  | — |  |  | — |  |  |  |  | (1,227,414) |
Transfer of net unrealized loss from AFS to investment securities | 267,509 |  |  | (267,509) |  |  | — |  |  |  |  | — |
Reclassification adjustments included in earnings: |  |  |  |  |  |  |  |  |
Interest revenue, Investment securities | — |  |  | 42,514 |  |  | — |  |  |  |  | 42,514 |
Operating expense, Personnel | — |  |  | — |  |  | (3,483) |  |  |  |  | (3,483) |
Loss on available for sale securities, net | 971 |  |  | — |  |  | — |  |  |  |  | 971 |
Other comprehensive income (loss), before income taxes | (958,934) |  |  | (224,995) |  |  | (3,483) |  |  |  |  | (1,187,412) |
Federal and state income tax | (224,541) |  |  | (52,658) |  |  | (887) |  |  |  |  | (278,086) |
Other comprehensive income (loss), net of income taxes | (734,393) |  |  | (172,337) |  |  | (2,596) |  |  |  |  | (909,326) |
Balance, December 31, 2022 | (664,618) |  |  | (172,337) |  |  | — |  |  |  |  | (836,955) |
Net change in unrealized gain (loss) | 218,293 |  |  | — |  |  | — |  |  |  |  | 218,293 |
Reclassification adjustments included in earnings: |  |  |  |  |  |  |  |  |
Interest revenue, Investment securities | — |  |  | 60,394 |  |  | — |  |  |  |  | 60,394 |
Loss on available for sale securities, net | 30,636 |  |  | — |  |  | — |  |  |  |  | 30,636 |
Other comprehensive income (loss), before income taxes | 248,929 |  |  | 60,394 |  |  | — |  |  |  |  | 309,323 |
Federal and state income tax | 57,523 |  |  | 13,945 |  |  | — |  |  |  |  | 71,468 |
Other comprehensive income (loss), net of income taxes | 191,406 |  |  | 46,449 |  |  | — |  |  |  |  | 237,855 |
Balance, December 31, 2023 | $ | (473,212) |  |  | $ | (125,888) |  |  | $ | — |  |  |  |  | $ | (599,100) |

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