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Federal and State Income Taxes | 12 Months Ended
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Dec. 31, 2023
Income Tax Disclosure [Abstract] |
Federal and State Income Taxes [Text Block] | Federal and State Income Taxes 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,
| 2023 |  | 2022
Deferred tax assets: |  |  |
Available for sale securities mark to market | $ | 183,724 |  |  | $ | 255,244 |
Credit loss reserves | 76,361 |  |  | 69,385 |
Lease liability | 61,204 |  |  | 49,839 |
Deferred compensation | 41,350 |  |  | 34,645 |
Unearned fees | 12,682 |  |  | 12,915 |
Purchased loan discount | 3,546 |  |  | 4,955 |
Share-based compensation | 6,068 |  |  | 4,625 |
Valuation adjustments | 4,860 |  |  | 5,792 |
Other | 47,169 |  |  | 42,808 |
Total deferred tax assets | 436,964 |  |  | 480,208 |
Deferred tax liabilities: |  |  |
Right-of-use asset | 51,943 |  |  | 40,741 |
Mortgage servicing rights | 47,646 |  |  | 49,001 |
Acquired identifiable intangible | 8,166 |  |  | 11,280 |
Depreciation | 4,578 |  |  | 7,163 |
Lease financing | 12,148 |  |  | 12,333 |
Other | 42,887 |  |  | 38,357 |
Total deferred tax liabilities | 167,368 |  |  | 158,875 |
Net deferred tax assets | $ | 269,596 |  |  | $ | 321,333 |
No valuation allowance was necessary on deferred tax assets as of December 31, 2023 and 2022. 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,
| 2023 |  | 2022 |  | 2021
Current income tax expense: |  |  |  |  |
Federal | $ | 152,600 |  |  | $ | 127,144 |  |  | $ | 121,196 |
State | 19,298 |  |  | 18,185 |  |  | 21,065 |
Total current income tax expense | 171,898 |  |  | 145,329 |  |  | 142,261 |
Deferred income tax expense (benefit): |  |  |  |  |
Federal | (17,973) |  |  | (4,700) |  |  | 29,777 |
State | (1,810) |  |  | (765) |  |  | 7,737 |
Total deferred income tax expense (benefit) | (19,783) |  |  | (5,465) |  |  | 37,514 |
Total income tax expense | $ | 152,115 |  |  | $ | 139,864 |  |  | $ | 179,775 |
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,
| 2023 |  | 2022 |  | 2021
Amount: |  |  |  |  |
Federal statutory tax | $ | 143,482 |  |  | $ | 138,633 |  |  | $ | 167,181 |
Tax exempt revenue | (5,786) |  |  | (5,714) |  |  | (6,084) |
Effect of state income taxes, net of federal benefit | 13,330 |  |  | 13,490 |  |  | 22,489 |
Utilization of tax credits, net of proportional amortization of low-income housing, new market, and historical tax credits | (2,673) |  |  | (8,883) |  |  | (8,801) |
Other, net | 3,762 |  |  | 2,338 |  |  | 4,990 |
Total income tax expense | $ | 152,115 |  |  | $ | 139,864 |  |  | $ | 179,775 |
| Year Ended December 31,
| 2023 |  | 2022 |  | 2021
Percent of pretax income: |  |  |  |  |
Federal statutory tax | 21.0 | % |  | 21.0 | % |  | 21.0 | %
Tax exempt revenue | (0.8) |  |  | (0.8) |  |  | (0.7) |
Effect of state income taxes, net of federal benefit | 2.0 |  |  | 2.0 |  |  | 2.8 |
Utilization of tax credits, net of proportional amortization of low-income housing, new market, and historical tax credits | (0.4) |  |  | (1.4) |  |  | (1.1) |
Other, net | 0.5 |  |  | 0.4 |  |  | 0.6 |
Total | 22.3 | % |  | 21.2 | % |  | 22.6 | %
A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows (in thousands):
| 2023 |  | 2022 |  | 2021
Balance as of January 1 | $ | 19,583 |  |  | $ | 21,092 |  |  | $ | 22,902 |
Additions for tax for current year positions | 3,239 |  |  | 3,465 |  |  | 3,961 |
Settlements during the period | — |  |  | — |  |  | (1,754) |
Lapses of applicable statute of limitations | (4,865) |  |  | (4,974) |  |  | (4,017) |
Balance as of December 31 | $ | 17,957 |  |  | $ | 19,583 |  |  | $ | 21,092 |
Of the above unrecognized tax benefits, $14.1 million, if recognized, would have affected the effective tax rate. BOK Financial recognizes interest and penalties accrued related to unrecognized tax benefits in income tax expense. The Company recognized $1.6 million for 2023, $1.8 million for 2022 and $2.3 million for 2021 in interest and penalties. The Company had approximately $5.7 million and $6.0 million accrued for the payment of interest and penalties at December 31, 2023 and 2022, respectively. Federal statutes remain open for federal tax returns filed in the previous three reporting periods. Various state income tax statutes remain open for the previous three to six reporting periods.

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