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Federal Income Taxes (Tables)
12 Months Ended
Dec. 31, 2021
Income Tax Disclosure [Abstract]  
Schedule of Reconciliation of Federal Income Tax on Income at the Corporate Rate to the Effective Tax Rate
($ in thousands)202120202019
Tax at statutory rate $106,115 63,627 70,642 
Tax-advantaged interest(4,514)(4,730)(4,909)
Dividends received deduction(558)(514)(443)
Executive compensation2,469 2,246 2,985 
Stock-based compensation(693)(1,846)(3,253)
Other(1,346)(2,150)(255)
Federal income tax expense101,473 56,633 64,767 
Income before federal income tax, less preferred stock dividends495,957 302,988 336,390 
Effective tax rate20.5 %18.7 %19.3 %
Schedule of Deferred Tax Assets and Liabilities
($ in thousands)20212020
Deferred tax assets:  
Net loss reserve discounting$60,227 54,240 
Net unearned premiums68,086 60,842 
Employee benefits2,787 8,943 
Long-term incentive compensation plans5,904 5,472 
Temporary investment write-downs4,314 6,037 
Other2,245 7,195 
Total deferred tax assets143,563 142,729 
Deferred tax liabilities:  
Deferred policy acquisition costs68,652 60,601 
Unrealized gains on investment securities48,082 81,142 
Other investment-related items, net27,044 14,760 
Accelerated depreciation and amortization13,198 13,322 
Total deferred tax liabilities156,976 169,825 
Net deferred federal income tax liability$(13,413)(27,096)