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Comprehensive Income (Reclassification out of AOCI) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Net realized and unrealized investment gains (losses) $ 10,057 $ 12,649 $ 15,176 $ (32,017)
Net investment income earned 83,731 34,444 153,447 90,411
Loss and loss expense incurred 421,623 403,949 835,024 804,273
Other insurance expenses 94,862 84,601 183,772 179,947
Income before federal income tax 153,198 42,693 288,830 58,690
Total federal income tax expense (31,315) (8,510) (57,677) (9,271)
Net income 121,883 34,183 231,153 49,419
Reclassification out of AOCI        
Net income (1,203) (4,652) 3,767 17,384
Pension Plan [Member] | Reclassification out of AOCI        
Loss and loss expense incurred 160 162 319 324
Other insurance expenses 533 591 1,067 1,183
Income before federal income tax 693 753 1,386 1,507
Total federal income tax expense (145) (158) (291) (316)
Net income 548 595 1,095 1,191
Held-to-maturity Securities [Member] | Reclassification out of AOCI        
Net realized and unrealized investment gains (losses) 0 0 0 1
Net investment income earned (3) (31) (5) (7)
Income before federal income tax (3) (31) (5) (6)
Total federal income tax expense 1 6 1 1
Net income (2) (25) (4) (5)
Available for sale securities, excluding credit losses [Member] | Reclassification out of AOCI        
Net realized and unrealized investment gains (losses) 58 (1,686) 662 9,641
Income before federal income tax 58 (1,686) 662 9,641
Total federal income tax expense (12) 354 (139) (2,025)
Net income 46 (1,332) 523 7,616
Available for sale securities, including credit losses | Reclassification out of AOCI        
Net realized and unrealized investment gains (losses) (2,272) (4,924) 2,725 10,863
Income before federal income tax (2,272) (4,924) 2,725 10,863
Total federal income tax expense 477 1,034 (572) (2,281)
Net income $ (1,795) $ (3,890) $ 2,153 $ 8,582