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Federal Income Taxes (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, 2021
Dec. 31, 2020
Dec. 31, 2019
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)
Federal Income Tax Expense Benefit Related to Executive Compensation 2,469 2,246 2,985
Federal Income Tax Expense (Benefit) Related to Stock-based Compensation (693) (1,846) (3,253)
Other (1,346) (2,150) (255)
Total federal income tax expense 101,473 56,633 64,767
Income available to common stockholders, before tax $ 495,957 $ 302,988 $ 336,390
Effective Income Tax Rate Reconciliation, Percent 20.50% 18.70% 19.30%
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 21.00%