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Federal and State Income Taxes
12 Months Ended
Dec. 31, 2021
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,
20212020
Deferred tax assets:
Credit loss reserves$67,339 $101,265 
Lease liability48,457 44,794 
Deferred compensation33,945 29,504 
Unearned fees11,368 14,584 
Purchased loan discount7,498 11,537 
Share-based compensation5,989 6,525 
Valuation adjustments1,883 3,834 
Other28,958 29,963 
Total deferred tax assets205,437 242,006 
Deferred tax liabilities:
Available for sale securities mark to market21,841 105,769 
Right-of-use asset41,291 38,635 
Mortgage servicing rights31,703 24,182 
Acquired identifiable intangible14,307 18,138 
Depreciation10,939 13,754 
Lease financing11,120 11,828 
Other39,698 39,210 
Total deferred tax liabilities170,899 251,516 
Net deferred tax assets (liabilities)$34,538 $(9,510)

No valuation allowance was necessary on deferred tax assets as of December 31, 2021 and 2020.

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,
202120202019
Current income tax expense:
Federal$121,196 $173,888 $110,887 
State21,065 29,889 15,088 
Total current income tax expense142,261 203,777 125,975 
Deferred income tax expense (benefit):
Federal29,777 (65,989)3,416 
State7,737 (8,995)792 
Total deferred income tax expense (benefit)37,514 (74,984)4,208 
Total income tax expense$179,775 $128,793 $130,183 
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,
 202120202019
Amount:  
Federal statutory tax$167,181 $118,412 $132,482 
Tax exempt revenue(6,084)(7,035)(12,227)
Effect of state income taxes, net of federal benefit22,489 14,251 12,715 
Utilization of tax credits, net of proportional amortization of low-income housing limited partnership investments
(8,801)(6,994)(5,127)
Other, net4,990 10,159 2,340 
Total income tax expense$179,775 $128,793 $130,183 

Year Ended December 31,
 202120202019
Percent of pretax income:  
Federal statutory tax21.0 %21.0 %21.0 %
Tax exempt revenue(0.7)(1.2)(1.9)
Effect of state income taxes, net of federal benefit2.8 2.5 2.0 
Utilization of tax credits, net of proportional amortization of low-income housing limited partnership investments
(1.1)(1.2)(0.8)
Other, net0.6 1.7 0.3 
Total22.6 %22.8 %20.6 %

A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows (in thousands):
202120202019
Balance as of January 1$22,902 $20,465 $18,869 
Additions for tax for current year positions3,961 6,384 5,649 
Settlements during the period(1,754)— — 
Lapses of applicable statute of limitations(4,017)(3,947)(4,053)
Balance as of December 31$21,092 $22,902 $20,465 

Of the above unrecognized tax benefits, $16.4 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 $2.3 million for 2021, $2.4 million for 2020 and $2.2 million for 2019 in interest and penalties. The Company had approximately $6.4 million and $5.9 million accrued for the payment of interest and penalties at December 31, 2021 and 2020, 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.