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Comprehensive Income (Reclassification out of AOCI) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Net realized and unrealized investment gains (losses) $ 177 $ 7,721 $ 15,353 $ (24,296)
Net investment income earned 93,032 68,185 246,479 158,596
Loss and loss expense incurred 505,269 447,802 1,340,293 1,252,075
Other insurance expenses 94,759 89,530 278,531 269,477
Income before federal income tax 92,636 85,257 381,466 143,947
Total federal income tax expense (18,931) (15,382) (76,608) (24,653)
Net income 73,705 69,875 304,858 119,294
Reclassification out of AOCI        
Net income 579 (2,064) 4,346 15,320
Pension Plan [Member] | Reclassification out of AOCI        
Loss and loss expense incurred 159 162 478 486
Other insurance expenses 534 592 1,601 1,775
Income before federal income tax 693 754 2,079 2,261
Total federal income tax expense (145) (158) (436) (474)
Net income 548 596 1,643 1,787
Held-to-maturity Securities [Member] | Reclassification out of AOCI        
Net realized and unrealized investment gains (losses) (1) 4 (1) 5
Net investment income earned 2 (5) (3) (12)
Income before federal income tax 1 (1) (4) (7)
Total federal income tax expense 0 1 1 2
Net income 1 0 (3) (5)
Available for sale securities, excluding credit losses [Member] | Reclassification out of AOCI        
Net realized and unrealized investment gains (losses) (1,296) (515) (634) 9,126
Income before federal income tax (1,296) (515) (634) 9,126
Total federal income tax expense 272 109 133 (1,916)
Net income (1,024) (406) (501) 7,210
Available for sale securities, including credit losses | Reclassification out of AOCI        
Net realized and unrealized investment gains (losses) 1,334 (2,853) 4,059 8,010
Income before federal income tax 1,334 (2,853) 4,059 8,010
Total federal income tax expense (280) 599 (852) (1,682)
Net income $ 1,054 $ (2,254) $ 3,207 $ 6,328