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Parent Corporation Statements of Income (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Revenues:                      
Net investment income earned $ 68,511 $ 68,185 $ 34,444 $ 55,967 $ 57,594 $ 55,826 $ 58,505 $ 50,618 $ 227,107 $ 222,543 $ 195,336
Total revenues 798,432 776,566 682,447 664,829 728,900 710,425 708,204 698,962 2,922,274 2,846,491 2,586,080
Expenses:                      
Interest expense                 30,839 33,668 24,419
Total expenses                 2,619,286 2,510,101 2,374,359
Income before federal income tax 159,041 85,257 42,693 15,997 101,293 71,178 90,225 73,694 302,988 336,390 211,721
Federal income tax (benefit) expense:                      
Current                 60,059 60,640 35,012
Deferred                 (3,426) 4,127 (2,230)
Total federal income tax benefit                 56,633 64,767 32,782
Net income 127,061 69,875 34,183 15,236 81,859 56,150 72,266 61,348 246,355 271,623 178,939
Preferred stock dividends                 0 0 0
Net Income available to common stockholders $ 127,061 $ 69,875 $ 34,183 $ 15,236 $ 81,859 $ 56,150 $ 72,266 $ 61,348 246,355 271,623 178,939
Parent Company [Member]                      
Revenues:                      
Dividends from subsidaries                 104,992 110,004 100,060
Net investment income earned                 7,579 7,301 3,425
Net realized and unrealized investment gains (losses)                 1,756 207 (1,567)
Total revenues                 114,327 117,512 101,918
Expenses:                      
Interest expense                 29,220 33,426 24,652
Other expenses                 25,412 30,900 25,446
Total expenses                 54,632 64,326 50,098
Income before federal income tax                 59,695 53,186 51,820
Federal income tax (benefit) expense:                      
Current                 (10,987) (16,080) (14,173)
Deferred                 473 3,606 3,141
Total federal income tax benefit                 (10,514) (12,474) (11,032)
Net income before equity in undistributed income of subsidiaries                 70,209 65,660 62,852
Equity In Undistributed Income Of Continuing Subsidiaries, Net Of Tax                 176,146 205,963 116,087
Net income                 246,355 271,623 178,939
Preferred stock dividends                 0 0 0
Net Income available to common stockholders                 $ 246,355 $ 271,623 $ 178,939