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Federal and State Income Taxes
 12 Months Ended
Dec. 31, 2020
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,
20202019
Deferred tax assets:
Credit loss reserves$101,265 $50,611 
Lease liability44,794 46,084 
Deferred compensation29,504 25,976 
Unearned fees14,584 9,080 
Purchased loan discount11,537 18,042 
Share-based compensation6,525 7,392 
Valuation adjustments3,834 1,545 
Other29,963 26,384 
Total deferred tax assets242,006 185,114 
Deferred tax liabilities:
Available for sale securities mark to market105,769 33,140 
Right-of-use asset38,635 42,180 
Mortgage servicing rights24,182 48,435 
Acquired identifiable intangible18,138 23,181 
Depreciation13,754 18,909 
Lease financing11,828 10,720 
Other39,210 34,826 
Total deferred tax liabilities251,516 211,391 
Net deferred tax liabilities$(9,510)$(26,277)

No valuation allowance was necessary on deferred tax assets as of December 31, 2020 and 2019.

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,
202020192018
Current income tax expense:
Federal$173,888 $110,887 $103,748 
State29,889 15,088 15,253 
Total current income tax expense203,777 125,975 119,001 
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 
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,
 202020192018
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 benefit14,251 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, net10,159 2,340 749 
Total income tax expense$128,793 $130,183 $119,061 

Year Ended December 31,
 202020192018
Percent of pretax income:  
Federal statutory tax21.0 %21.0 %21.0 %
Tax exempt revenue(1.2)(1.9)(1.5)
Effect of state income taxes, net of federal benefit2.5 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, net1.7 0.3 0.2 
Total22.8 %20.6 %21.1 %

A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows (in thousands):
202020192018
Balance as of January 1$20,465 $18,869 $18,110 
Additions for tax for current year positions6,384 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 

Of the above unrecognized tax benefits, $17.2 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 $2.4 million for 2020, $2.2 million for 2019 and $1.7 million for 2018 in interest and penalties. The Company had approximately $5.9 million and $5.6 million accrued for the payment of interest and penalties at December 31, 2020 and 2019, 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.