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Federal and State Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2020
Income Tax Disclosure [Abstract] |
Schedule of Deferred Tax Assets and Liabilities [Table Text Block] | Deferred income taxes reflect the net tax effects of temporary differences between the carrying amounts of assets and liabilities for financial reporting purposes and the amounts used for income tax purposes. Significant components of deferred tax assets and liabilities are as follows (in thousands):
| December 31,
| 2020 |  | 2019
Deferred tax assets: |  |  |
Credit loss reserves | $ | 101,265 |  |  | $ | 50,611 |
Lease liability | 44,794 |  |  | 46,084 |
Deferred compensation | 29,504 |  |  | 25,976 |
Unearned fees | 14,584 |  |  | 9,080 |
Purchased loan discount | 11,537 |  |  | 18,042 |
Share-based compensation | 6,525 |  |  | 7,392 |
Valuation adjustments | 3,834 |  |  | 1,545 |
Other | 29,963 |  |  | 26,384 |
Total deferred tax assets | 242,006 |  |  | 185,114 |
Deferred tax liabilities: |  |  |
Available for sale securities mark to market | 105,769 |  |  | 33,140 |
Right-of-use asset | 38,635 |  |  | 42,180 |
Mortgage servicing rights | 24,182 |  |  | 48,435 |
Acquired identifiable intangible | 18,138 |  |  | 23,181 |
Depreciation | 13,754 |  |  | 18,909 |
Lease financing | 11,828 |  |  | 10,720 |
Other | 39,210 |  |  | 34,826 |
Total deferred tax liabilities | 251,516 |  |  | 211,391 |
Net deferred tax liabilities | $ | (9,510) |  |  | $ | (26,277) |
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] | The significant components of the provision for income taxes attributable to continuing operations for BOK Financial are shown below (in thousands):
| Year Ended December 31,
| 2020 |  | 2019 |  | 2018
Current income tax expense: |  |  |  |  |
Federal | $ | 173,888 |  |  | $ | 110,887 |  |  | $ | 103,748 |
State | 29,889 |  |  | 15,088 |  |  | 15,253 |
Total current income tax expense | 203,777 |  |  | 125,975 |  |  | 119,001 |
Deferred income tax expense (benefit): |  |  |  |  |
Federal | (65,989) |  |  | 3,416 |  |  | (190) |
State | (8,995) |  |  | 792 |  |  | 250 |
Total deferred income tax expense (benefit) | (74,984) |  |  | 4,208 |  |  | 60 |
Total income tax expense | $ | 128,793 |  |  | $ | 130,183 |  |  | $ | 119,061 |
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] | The reconciliations of income attributable to continuing operations at the U.S. federal statutory tax rate to income tax expense are as follows (in thousands):
| Year Ended December 31,
| 2020 |  | 2019 |  | 2018
Amount: |  |  |  |  |
Federal statutory tax | $ | 118,412 |  |  | $ | 132,482 |  |  | $ | 118,752 |
Tax exempt revenue | (7,035) |  |  | (12,227) |  |  | (8,311) |
Effect of state income taxes, net of federal benefit | 14,251 |  |  | 12,715 |  |  | 12,430 |
Utilization of tax credits, net of proportional amortization of low-income housing limited partnership investments | (6,994) |  |  | (5,127) |  |  | (4,559) |
Other, net | 10,159 |  |  | 2,340 |  |  | 749 |
Total income tax expense | $ | 128,793 |  |  | $ | 130,183 |  |  | $ | 119,061 |
| Year Ended December 31,
| 2020 |  | 2019 |  | 2018
Percent of pretax income: |  |  |  |  |
Federal statutory tax | 21.0 | % |  | 21.0 | % |  | 21.0 | %
Tax exempt revenue | (1.2) |  |  | (1.9) |  |  | (1.5) |
Effect of state income taxes, net of federal benefit | 2.5 |  |  | 2.0 |  |  | 2.2 |
Utilization of tax credits, net of proportional amortization of low-income housing limited partnership investments | (1.2) |  |  | (0.8) |  |  | (0.8) |
Other, net | 1.7 |  |  | 0.3 |  |  | 0.2 |
Total | 22.8 | % |  | 20.6 | % |  | 21.1 | %
Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block] | A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows (in thousands):
| 2020 |  | 2019 |  | 2018
Balance as of January 1 | $ | 20,465 |  |  | $ | 18,869 |  |  | $ | 18,110 |
Additions for tax for current year positions | 6,384 |  |  | 5,649 |  |  | 2,649 |
Settlements during the period | — |  |  | — |  |  | — |
Lapses of applicable statute of limitations | (3,947) |  |  | (4,053) |  |  | (1,890) |
Balance as of December 31 | $ | 22,902 |  |  | $ | 20,465 |  |  | $ | 18,869 |

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