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Shareholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2020
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, 2020 |  | December 31, 2019
Common Equity Tier 1 Capital (to Risk Weighted Assets): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated |  | 4.50% |  | 2.50% |  | 7.00% |  | N/A |  | $ | 3,881,912 |  |  | 11.95 | % |  | $ | 3,608,821 |  |  | 11.39 | %
BOKF, NA |  | 4.50% |  | N/A |  | 4.50% |  | 6.50% |  | 3,756,950 |  |  | 11.66 | % |  | 3,414,446 |  |  | 10.90 | %
Tier I Capital (to Risk Weighted Assets): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated |  | 6.00% |  | 2.50% |  | 8.50% |  | N/A |  | $ | 3,881,912 |  |  | 11.95 | % |  | $ | 3,608,821 |  |  | 11.39 | %
BOKF, NA |  | 6.00% |  | N/A |  | 6.00% |  | 8.00% |  | 3,756,950 |  |  | 11.66 | % |  | 3,414,446 |  |  | 10.90 | %
Total Capital (to Risk Weighted Assets): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated |  | 8.00% |  | 2.50% |  | 10.50% |  | N/A |  | $ | 4,489,110 |  |  | 13.82 | % |  | $ | 4,097,087 |  |  | 12.94 | %
BOKF, NA |  | 8.00% |  | N/A |  | 8.00% |  | 10.00% |  | 4,153,347 |  |  | 12.89 | % |  | 3,692,010 |  |  | 11.79 | %
Leverage (Tier I Capital to Average Assets): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated |  | 4.00% |  | N/A |  | 4.00% |  | N/A |  | $ | 3,881,912 |  |  | 8.28 | % |  | $ | 3,608,820 |  |  | 8.40 | %
BOKF, NA |  | 4.00% |  | N/A |  | 4.00% |  | 5.00% |  | 3,756,950 |  |  | 8.04 | % |  | 3,414,446 |  |  | 7.98 | %
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 |  |  |  | Employee Benefit Plans |  |  |  | Total
Balance, December 31, 2017 | $ | (35,385) |  |  |  |  | $ | (789) |  |  |  |  | $ | (36,174) |
Transition adjustment for net unrealized gains on equity securities | (2,709) |  |  |  |  | — |  |  |  |  | (2,709) |
Net change in unrealized gain (loss) | (46,941) |  |  |  |  | (1,069) |  |  |  |  | (48,010) |
Reclassification adjustments included in earnings: |  |  |  |  |  |  |  |  |
Loss on available for sale securities, net | 2,801 |  |  |  |  | — |  |  |  |  | 2,801 |
Other comprehensive income (loss), before income taxes | (44,140) |  |  |  |  | (1,069) |  |  |  |  | (45,209) |
Federal and state income tax | (11,235) |  |  |  |  | (272) |  |  |  |  | (11,507) |
Other comprehensive income (loss), net of income taxes | (32,905) |  |  |  |  | (797) |  |  |  |  | (33,702) |
Balance, December 31, 2018 | (70,999) |  |  |  |  | (1,586) |  |  |  |  | (72,585) |
Net change in unrealized gain (loss) | 239,017 |  |  |  |  | 2,030 |  |  |  |  | 241,047 |
Reclassification adjustments included in earnings: |  |  |  |  |  |  |  |  |
Gain on available for sale securities, net | (5,597) |  |  |  |  | — |  |  |  |  | (5,597) |
Other comprehensive income (loss), before income taxes | 233,420 |  |  |  |  | 2,030 |  |  |  |  | 235,450 |
Federal and state income tax | 57,425 |  |  |  |  | 517 |  |  |  |  | 57,942 |
Other comprehensive income (loss), net of income taxes | 175,995 |  |  |  |  | 1,513 |  |  |  |  | 177,508 |
Balance, December 31, 2019 | 104,996 |  |  |  |  | (73) |  |  |  |  | 104,923 |
Net change in unrealized gain (loss) | 312,576 |  |  |  |  | 1,220 |  |  |  |  | 313,796 |
Reclassification adjustments included in earnings: |  |  |  |  |  |  |  |  |
Gain on available for sale securities, net | (9,910) |  |  |  |  | — |  |  |  |  | (9,910) |
Other comprehensive income (loss), before income taxes | 302,666 |  |  |  |  | 1,220 |  |  |  |  | 303,886 |
Federal and state income tax | 72,630 |  |  |  |  | 311 |  |  |  |  | 72,941 |
Other comprehensive income (loss), net of income taxes | 230,036 |  |  |  |  | 909 |  |  |  |  | 230,945 |
Balance, December 31, 2020 | $ | 335,032 |  |  |  |  | $ | 836 |  |  |  |  | $ | 335,868 |

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