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Parent Corporation Statements of Income (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Revenues:      
Net investment income earned $ 326,589 $ 227,107 $ 222,543
Total revenues 3,379,164 2,922,274 2,846,491
Expenses:      
Interest expense 29,165 30,839 33,668
Total expenses 2,873,854 2,619,286 2,510,101
Income before federal income tax 505,310 302,988 336,390
Federal income tax (benefit) expense:      
Current 87,335 60,059 60,640
Deferred 14,138 (3,426) 4,127
Total federal income tax benefit 101,473 56,633 64,767
Net income 403,837 246,355 271,623
Preferred stock dividends 9,353 0 0
Net Income available to common stockholders 394,484 246,355 271,623
Parent Company [Member]      
Revenues:      
Dividends from subsidaries 140,018 104,992 110,004
Net investment income earned 15,454 7,579 7,301
Net realized and unrealized investment gains 1,898 1,756 207
Total revenues 157,370 114,327 117,512
Expenses:      
Interest expense 28,988 29,220 33,426
Other expenses 28,305 25,412 30,900
Total expenses 57,293 54,632 64,326
Income before federal income tax 100,077 59,695 53,186
Federal income tax (benefit) expense:      
Current (6,552) (10,987) (16,080)
Deferred 12 473 3,606
Total federal income tax benefit (6,540) (10,514) (12,474)
Net income before equity in undistributed income of subsidiaries 106,617 70,209 65,660
Equity In Undistributed Income Of Continuing Subsidiaries, Net Of Tax 297,220 176,146 205,963
Net income 403,837 246,355 271,623
Preferred stock dividends 9,353 0 0
Net Income available to common stockholders $ 394,484 $ 246,355 $ 271,623