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Federal and State Income Taxes
12 Months Ended
Dec. 31, 2022
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,
20222021
Deferred tax assets:
Available for sale securities mark to market$255,244 $— 
Credit loss reserves69,385 67,339 
Lease liability49,839 48,457 
Deferred compensation34,645 33,945 
Unearned fees12,915 11,368 
Purchased loan discount4,955 7,498 
Share-based compensation4,625 5,989 
Valuation adjustments5,792 1,883 
Other42,808 28,958 
Total deferred tax assets480,208 205,437 
Deferred tax liabilities:
Right-of-use asset40,741 41,291 
Mortgage servicing rights49,001 31,703 
Available for sale securities mark to market 21,841 
Acquired identifiable intangible11,280 14,307 
Depreciation7,163 10,939 
Lease financing12,333 11,120 
Other38,357 39,698 
Total deferred tax liabilities158,875 170,899 
Net deferred tax assets (liabilities)$321,333 $34,538 

No valuation allowance was necessary on deferred tax assets as of December 31, 2022 and 2021.

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,
202220212020
Current income tax expense:
Federal$127,144 $121,196 $173,888 
State18,185 21,065 29,889 
Total current income tax expense145,329 142,261 203,777 
Deferred income tax expense (benefit):
Federal(4,700)29,777 (65,989)
State(765)7,737 (8,995)
Total deferred income tax expense (benefit)(5,465)37,514 (74,984)
Total income tax expense$139,864 $179,775 $128,793 
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,
 202220212020
Amount:  
Federal statutory tax$138,633 $167,181 $118,412 
Tax exempt revenue(5,714)(6,084)(7,035)
Effect of state income taxes, net of federal benefit13,490 22,489 14,251 
Utilization of tax credits, net of proportional amortization of low-income housing limited partnership investments
(8,883)(8,801)(6,994)
Other, net2,338 4,990 10,159 
Total income tax expense$139,864 $179,775 $128,793 

Year Ended December 31,
 202220212020
Percent of pretax income:  
Federal statutory tax21.0 %21.0 %21.0 %
Tax exempt revenue(0.8)(0.7)(1.2)
Effect of state income taxes, net of federal benefit2.0 2.8 2.5 
Utilization of tax credits, net of proportional amortization of low-income housing limited partnership investments
(1.4)(1.1)(1.2)
Other, net0.4 0.6 1.7 
Total21.2 %22.6 %22.8 %

A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows (in thousands):
202220212020
Balance as of January 1$21,092 $22,902 $20,465 
Additions for tax for current year positions3,465 3,961 6,384 
Settlements during the period (1,754)— 
Lapses of applicable statute of limitations(4,974)(4,017)(3,947)
Balance as of December 31$19,583 $21,092 $22,902 

Of the above unrecognized tax benefits, $15.3 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 $1.8 million for 2022, $2.3 million for 2021 and $2.4 million for 2020 in interest and penalties. The Company had approximately $6.0 million and $6.4 million accrued for the payment of interest and penalties at December 31, 2022 and 2021, 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.