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Income Taxes
12 Months Ended
Dec. 31, 2020
Income Tax Disclosure [Abstract]  
Income Taxes Income Taxes 
 
The following table presents the components of income tax provision for the years ended December 31, 2020, 2019 and 2018:
(in thousands)CurrentDeferredTotal
Year ended December 31, 2020:
  Federal$96,575 $(46,556)$50,019 
  State33,368 (16,387)16,981 
Total provision for income taxes$129,943 $(62,943)$67,000 
Year ended December 31, 2019:
  Federal$90,227 $(5,123)$85,104 
  State28,125 1,579 29,704 
Total provision for income taxes$118,352 $(3,544)$114,808 
Year ended December 31, 2018:
  Federal$68,651 $11,655 $80,306 
  State18,960 7,157 26,117 
Total provision for income taxes$87,611 $18,812 $106,423 
The following table presents a reconciliation of income taxes computed at the Federal statutory rate to the actual effective rate for the years ended December 31, 2020, 2019 and 2018:
202020192018
Statutory Federal income tax rate21.0 %21.0 %21.0 %
State tax, net of Federal benefit(1.0)%5.0 %5.0 %
Impairment of goodwill(25.0)%— %— %
Nondeductible FDIC premiums(0.1)%0.2 %0.3 %
Nondeductible executive compensation— %— %0.1 %
Tax-exempt income0.3 %(1.2)%(1.2)%
BOLI0.2 %(0.4)%(0.4)%
Other— %(0.1)%0.4 %
Effective income tax rate(4.6)%24.5 %25.2 %

The following table reflects the effects of temporary differences that give rise to the components of the net deferred tax liabilities recorded in other liabilities on the consolidated balance sheets as of December 31, 2020 and 2019:
(in thousands)December 31, 2020December 31, 2019
Deferred tax assets:
Allowance for credit losses$86,120 $41,176 
Operating lease liabilities29,239 30,750 
Accrued severance and deferred compensation16,729 16,131 
Accrued bonuses9,002 6,993 
Acquired loans7,387 9,953 
State taxes6,707 5,906 
Accrued reserves6,193 2,379 
Other15,075 8,358 
Total gross deferred tax assets176,452 121,646 
Deferred tax liabilities:
Unrealized gains on investment securities35,234 8,014 
Fair market value adjustment on junior subordinated debentures32,251 27,404 
Operating lease right-of-use asset27,010 28,506 
Direct financing leases25,802 29,741 
Residential mortgage servicing rights25,476 30,901 
Deferred loan fees and costs19,564 21,450 
Goodwill— 11,703 
Other15,466 15,765 
Total gross deferred tax liabilities180,803 173,484 
Valuation allowance(1,090)(1,090)
Net deferred tax liabilities$(5,441)$(52,928)
As of December 31, 2020 and 2019, the Company's gross deferred tax assets included $1.5 million and $1.7 million, respectively, of state NOL carryfowards expiring in tax years 2029-2031. The Company believes it is more likely than not that the benefit from certain state NOL carryforwards will not be realized and therefore has provided a valuation allowance of $1.1 million as of both December 31, 2020 and 2019, on the deferred tax assets relating to these state NOL carryforwards. The Company has determined that no other valuation allowance for the remaining deferred tax assets is required as management believes it is more likely than not that the remaining gross deferred tax assets, net of the valuation allowance, of $175.4 million and $120.6 million at December 31, 2020 and 2019, respectively, will be realized principally through future reversals of existing taxable temporary differences. Management further believes that future taxable income will be sufficient to realize the benefits of temporary deductible differences that cannot be realized through carry-back to prior years or through the reversal of future temporary taxable differences.

The Company and its subsidiaries file income tax returns in the U.S. federal jurisdiction, as well as the majority of states and Canada. The Company is no longer subject to U.S. and Canadian tax examinations for years before 2017, and is no longer subject to state tax examinations for years prior to 2016, with the exception of California, where the statute is still open for tax years 2012 and 2013.

The Company periodically reviews its income tax positions based on tax laws and regulations and financial reporting considerations, and records adjustments as appropriate. This review takes into consideration the status of current taxing authorities' examinations of the Company's tax returns, recent positions taken by the taxing authorities on similar transactions, if any, and the overall tax environment.

The Company had gross unrecognized tax benefits in the amount of $4.3 million recorded as of December 31, 2020 and 2019. If recognized, the unrecognized tax benefit would reduce the 2020 annual effective tax rate by 0.3%. Interest on unrecognized tax benefits is reported by the Company as a component of tax expense. As of December 31, 2020 and 2019, the accrued interest related to unrecognized tax benefits is $64,000 and $70,000, respectively.

During 2019, a settlement was entered into with California for the 2005 to 2011 tax years resulting in the reversal of $516,000 of gross unrecognized tax benefits. The 2019 gross unrecognized tax benefits also includes a $183,000 reversal related to a partial refund for amended returns filed with California for the 2012 and 2013 tax years, for which $1.7 million of unrecognized tax benefits was recorded in 2018.

Detailed below is a reconciliation of the Company's gross unrecognized tax benefits for the years ended December 31, 2020 and 2019, respectively:
(in thousands)20202019
Balance, beginning of period$4,307 $4,971 
Changes for tax positions of current year10 34 
Settlement— (698)
Balance, end of period$4,317 $4,307