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Federal Income Taxes - Schedule of Reconciliation of Federal Income Tax on Income at the Corporate Rate to the Effective Tax Rate (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Income Tax Disclosure [Abstract]      
Effective income tax rate reconciliation, at federal statutory income tax rate, percent 21.00%    
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 compensation 2,452 1,989 1,848
Stock-based compensation (1,482) (1,804) (893)
Other (2,589) (776) 62
Total federal income tax expense 51,022 93,174 55,300
Income before federal income tax, less preferred stock dividends $ 248,834 $ 449,212 $ 270,986
Effective tax rate 20.50% 20.70% 20.40%