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Federal Income Taxes (Tables)
 12 Months Ended
Dec. 31, 2024
Income Tax Disclosure [Abstract]  
Schedule of Reconciliation of Federal Income Tax on Income at the Corporate Rate to the Effective Tax Rate A reconciliation of federal income tax on income at the corporate rate (21.0%) to the effective tax rate is as follows:
($ in thousands)202420232022
Tax at statutory rate $54,187 96,267 58,839 
Tax-advantaged interest(1,332)(2,229)(4,087)
Dividends received deduction(214)(273)(469)
Executive compensation2,452 1,989 1,848 
Stock-based compensation(1,482)(1,804)(893)
Other(2,589)(776)62 
Federal income tax expense
51,022 93,174 55,300 
Income before federal income tax, less preferred stock dividends248,834 449,212 270,986 
Effective tax rate20.5 %20.7 %20.4 %
Schedule of Deferred Tax Assets and Liabilities The tax effects of the significant temporary differences that gave rise to deferred tax assets and liabilities were as follows:
($ in thousands)20242023
Deferred tax assets:  
Net loss reserve discounting$89,653 73,175 
Net unearned premiums100,053 89,413 
Employee benefits13,226 13,777 
Long-term incentive compensation7,106 6,736 
Unrealized losses on fixed income securities66,525 74,183 
Temporary investment write-downs7,987 7,560 
Other5,751 8,080 
Total deferred tax assets290,301 272,924 
Deferred tax liabilities:  
Deferred policy acquisition costs100,654 89,221 
Other investment-related items, net34,951 33,309 
Accelerated depreciation and amortization7,908 10,157 
Total deferred tax liabilities143,513 132,687 
Net deferred federal income tax assets (liabilities)$146,788 140,237