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Parent Corporation Statements of Income (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Revenues:                      
Net investment income earned $ 57,594 $ 55,826 $ 58,505 $ 50,618 $ 54,109 $ 52,443 $ 45,553 $ 43,231 $ 222,543 $ 195,336 $ 161,882
Net realized gains (losses)                 23,071 (25,554) 6,359
Total revenues 728,900 710,425 708,204 698,962 643,004 664,471 651,916 626,689 2,846,491 2,586,080 2,469,984
Expenses:                      
Interest expense                 33,668 24,419 24,354
Total expenses                 2,510,101 2,374,359 2,208,016
Federal income tax (benefit) expense:                      
Current                 60,640 35,012 62,184
Deferred                 4,127 (2,230) 30,958
Total federal income tax benefit                 64,767 32,782 93,142
Net income $ 81,859 $ 56,150 $ 72,266 $ 61,348 $ 45,760 $ 55,435 $ 58,819 $ 18,925 271,623 178,939 168,826
Parent Company [Member]                      
Revenues:                      
Dividends from subsidaries                 110,004 100,060 80,096
Net investment income earned                 7,301 3,425 2,044
Net realized gains (losses)                 207 (1,567) (15)
Total revenues                 117,512 101,918 82,125
Expenses:                      
Interest expense                 33,426 24,652 24,721
Other expenses                 30,900 25,446 36,251
Total expenses                 64,326 50,098 60,972
Income before federal income tax                 53,186 51,820 21,153
Federal income tax (benefit) expense:                      
Current                 (16,080) (14,173) (22,187)
Deferred                 3,606 3,141 6,311
Total federal income tax benefit                 (12,474) (11,032) (15,876)
Net income before equity in undistributed income of subsidiaries                 65,660 62,852 37,029
Equity In Undistributed Income Of Continuing Subsidiaries, Net Of Tax                 205,963 116,087 131,797
Net income                 $ 271,623 $ 178,939 $ 168,826