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Federal and State Income Taxes | 12 Months Ended
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Dec. 31, 2019
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,
| 2019 |  | 2018
Deferred tax assets: |  |  |
Credit loss reserves | $ | 50,611 |  |  | $ | 49,804 |
Lease liability | 46,084 |  |  | — |
Deferred compensation | 25,976 |  |  | 25,608 |
Purchased loan discount | 18,042 |  |  | 27,283 |
Unearned fees | 9,080 |  |  | 9,814 |
Share-based compensation | 7,392 |  |  | 4,434 |
Valuation adjustments | 1,545 |  |  | 9,619 |
Available for sale securities mark to market | — |  |  | 24,441 |
Other | 26,384 |  |  | 31,489 |
Total deferred tax assets | 185,114 |  |  | 182,492 |
Deferred tax liabilities: |  |  |
Mortgage servicing rights | 48,435 |  |  | 61,844 |
Right-of-use asset | 42,180 |  |  | — |
Available for sale securities mark to market | 33,140 |  |  | — |
Acquired identifiable intangible | 23,181 |  |  | 28,620 |
Depreciation | 18,909 |  |  | 15,966 |
Lease financing | 10,720 |  |  | 10,040 |
Other | 34,826 |  |  | 30,566 |
Total deferred tax liabilities | 211,391 |  |  | 147,036 |
Net deferred tax assets (liabilities) | $ | (26,277 | ) |  | $ | 35,456 |
No valuation allowance was necessary on deferred tax assets as of December 31, 2019 and 2018. 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,
| 2019 |  | 2018 |  | 2017
Current income tax expense: |  |  |  |  |
Federal | $ | 110,887 |  |  | $ | 103,748 |  |  | $ | 141,607 |
State | 15,088 |  |  | 15,253 |  |  | 14,592 |
Total current income tax expense | 125,975 |  |  | 119,001 |  |  | 156,199 |
Deferred income tax expense: |  |  |  |  |
Federal | 3,416 |  |  | (190 | ) |  | 25,525 |
State | 792 |  |  | 250 |  |  | 869 |
Total deferred income tax expense | 4,208 |  |  | 60 |  |  | 26,394 |
Total income tax expense | $ | 130,183 |  |  | $ | 119,061 |  |  | $ | 182,593 |
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,
| 2019 |  | 2018 |  | 2017
Amount: |  |  |  |  |
Federal statutory tax | $ | 132,482 |  |  | $ | 118,752 |  |  | $ | 181,397 |
Tax exempt revenue | (12,227 | ) |  | (8,311 | ) |  | (12,402 | )
Effect of state income taxes, net of federal benefit | 12,715 |  |  | 12,430 |  |  | 10,701 |
Utilization of tax credits, net of proportional amortization of low-income housing limited partnership investments | (5,127 | ) |  | (4,559 | ) |  | (6,811 | )
Other, net | 2,340 |  |  | 749 |  |  | 9,708 |
Total income tax expense | $ | 130,183 |  |  | $ | 119,061 |  |  | $ | 182,593 |
| Year Ended December 31,
| 2019 |  | 2018 |  | 2017
Percent of pretax income: |  |  |  |  |
Federal statutory tax | 21.0 | % |  | 21.0 | % |  | 35.0 | %
Tax exempt revenue | (1.9 | ) |  | (1.5 | ) |  | (2.4 | )
Effect of state income taxes, net of federal benefit | 2.0 |  |  | 2.2 |  |  | 2.0 |
Utilization of tax credits, net of proportional amortization of low-income housing limited partnership investments | (0.8 | ) |  | (0.8 | ) |  | (1.3 | )
Other, net | 0.3 |  |  | 0.2 |  |  | 1.9 |
Total | 20.6 | % |  | 21.1 | % |  | 35.2 | %
A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows (in thousands):
| 2019 |  | 2018 |  | 2017
Balance as of January 1 | $ | 18,869 |  |  | $ | 18,110 |  |  | $ | 15,841 |
Additions for tax for current year positions | 5,649 |  |  | 2,649 |  |  | 4,645 |
Settlements during the period | — |  |  | — |  |  | — |
Lapses of applicable statute of limitations | (4,053 | ) |  | (1,890 | ) |  | (2,376 | )
Balance as of December 31 | $ | 20,465 |  |  | $ | 18,869 |  |  | $ | 18,110 |
Of the above unrecognized tax benefits, $14.7 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 $2.2 million for 2019, $1.7 million for 2018 and $1.2 million for 2017 in interest and penalties. The Company had approximately $5.6 million and $5.0 million accrued for the payment of interest and penalties at December 31, 2019 and 2018, 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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- Definition The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -URI http://asc.fasb.org/topic&trid=2144680 + Details
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