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Shareholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2019
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 1 |  | Minimum Capital Requirement Including Capital Conservation Buffer |  | Well Capitalized Bank Requirement |  | December 31, 2019 |  | December 31, 2018
Common Equity Tier 1 Capital (to Risk Weighted Assets): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated |  | 4.50% |  | 2.50% |  | 7.00% |  | N/A |  | $ | 3,608,821 |  |  | 11.39 | % |  | $ | 3,356,524 |  |  | 10.92 | %
BOKF, NA |  | 4.50% |  | N/A |  | 4.50% |  | 6.50% |  | 3,414,446 |  |  | 10.90 | % |  | 2,894,119 |  |  | 10.50 | %
CoBiz Bank 2 |  | 4.50% |  | N/A |  | 4.50% |  | 6.50% |  | — |  |  | — | % |  | 317,944 |  |  | 10.65 | %
Tier I Capital (to Risk Weighted Assets): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated |  | 6.00% |  | 2.50% |  | 8.50% |  | N/A |  | $ | 3,608,821 |  |  | 11.39 | % |  | $ | 3,356,524 |  |  | 10.92 | %
BOKF, NA |  | 6.00% |  | N/A |  | 6.00% |  | 8.00% |  | 3,414,446 |  |  | 10.90 | % |  | 2,894,119 |  |  | 10.50 | %
CoBiz Bank 2 |  | 6.00% |  | N/A |  | 6.00% |  | 8.00% |  | — |  |  | — | % |  | 317,944 |  |  | 10.65 | %
Total Capital (to Risk Weighted Assets): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated |  | 8.00% |  | 2.50% |  | 10.50% |  | N/A |  | $ | 4,097,087 |  |  | 12.94 | % |  | $ | 3,841,684 |  |  | 12.50 | %
BOKF, NA |  | 8.00% |  | N/A |  | 8.00% |  | 10.00% |  | 3,692,010 |  |  | 11.79 | % |  | 3,103,366 |  |  | 11.26 | %
CoBiz Bank 2 |  | 8.00% |  | N/A |  | 8.00% |  | 10.00% |  | — |  |  | — | % |  | 382,944 |  |  | 12.83 | %
Leverage (Tier I Capital to Average Assets): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated |  | 4.00% |  | N/A |  | 4.00% |  | N/A |  | $ | 3,608,820 |  |  | 8.40 | % |  | $ | 3,356,524 |  |  | 8.96 | %
BOKF, NA |  | 4.00% |  | N/A |  | 4.00% |  | 5.00% |  | 3,414,446 |  |  | 7.98 | % |  | 2,894,119 |  |  | 8.56 | %
CoBiz Bank 2 |  | 4.00% |  | N/A |  | 4.00% |  | 5.00% |  | — |  |  | — | % |  | 317,944 |  |  | 8.25 | %
1 | Capital conservation buffer was effective January 1, 2016 and phased in through 2019. The phased in capital conservation buffer was 2.50% at December 31, 2019 and 1.875% at December 31, 2018. The fully phased in requirement of 2.50% is included in the table above.
2 | CoBiz Bank was acquired by BOK Financial effective October 1, 2018 and merged into BOKF, NA during the first quarter of 2019.
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, 2016 | $ | (9,087 | ) |  | $ | (1,880 | ) |  | $ | (10,967 | )
Net change in unrealized gain (loss) | (28,170 | ) |  | 2,018 |  |  | (26,152 | )
Reclassification adjustments included in earnings: |  |  |  |  |
Gain on available for sale securities, net | (4,428 | ) |  | — |  |  | (4,428 | )
Other comprehensive income (loss), before income taxes | (32,598 | ) |  | 2,018 |  |  | (30,580 | )
Federal and state income tax 1 | (12,708 | ) |  | 785 |  |  | (11,923 | )
Other comprehensive income (loss), net of income taxes | (19,890 | ) |  | 1,233 |  |  | (18,657 | )
Reclassification of stranded accumulated other comprehensive loss related to tax reform | (6,408 | ) |  | (142 | ) |  | (6,550 | )
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 2 | (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 2 | 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 |
1 | Calculated using a 39 percent blended federal and state statutory tax rate.
2 Calculated using a 25 percent blended federal and state statutory tax rate.

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