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Income Taxes (Tables)
12 Months Ended
Dec. 31, 2021
Income Tax Disclosure [Abstract]  
Components of Federal Corporate Income Tax Expense The components of the federal corporate income tax expense for the years ended December 31, 2021, 2020, and 2019 were as follows:
Table 10.1
 For the Year Ended December 31,
  202120202019
  (in thousands)
Current income tax expense$37,314 $30,634 $28,316 
Deferred income tax expense(1,961)(1,849)789 
Income tax expense$35,353 $28,785 $29,105 
Schedule of Effective Income Tax Rate Reconciliation
A reconciliation of income tax at the statutory federal corporate income tax rate to the income tax expense for the years ended December 31, 2021, 2020, and 2019 is as follows:

Table 10.2
 For the Year Ended December 31,
  202120202019
  (dollars in thousands)
Tax expense at statutory rate$35,198 $28,861 $29,117 
Excess tax benefits related to stock-based awards(300)(9)(449)
Valuation allowance— — 49 
Other455 (67)388 
Income tax expense$35,353 $28,785 $29,105 
Statutory tax rate21.0 %21.0 %21.0 %
Components of Deferred Tax Assets and Liabilities
The components of the deferred tax assets and liabilities as of December 31, 2021 and 2020 were as follows:

Table 10.3
 As of December 31,
  20212020
  (in thousands)
Deferred tax assets:  
Basis differences related to financial derivatives$63,982 $100,099 
Allowance for losses3,452 3,690 
Unrealized losses on cash flow hedges1,427 6,065 
Compensation and Benefits1,281 1,020 
Stock-based compensation1,462 1,027 
Capital loss carryforwards32 86 
Valuation allowance(32)(86)
Other394 341 
Total deferred tax assets71,998 112,242 
Deferred tax liability:  
Basis differences related to hedged items53,945 91,460 
Unrealized gains on available-for-sale securities2,451 2,364 
Other44 97 
Total deferred tax liability56,440 93,921 
Net deferred tax asset$15,558 $18,321