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Comprehensive Income (Reclassification out of AOCI) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Net realized and unrealized investment (losses) gains $ (25,681) $ 177 $ (108,913) $ 15,353
Net investment income earned 63,889 93,032 206,713 246,479
Loss and loss expense incurred 547,826 505,269 1,566,930 1,340,293
Other insurance expenses 102,806 94,759 298,310 278,531
Income before federal income tax 52,639 92,636 172,433 381,466
Total federal income tax expense (10,114) (18,931) (34,058) (76,608)
Net income (loss) 42,525 73,705 138,375 304,858
Reclassification out of AOCI        
Net income (loss) 15,108 579 72,437 4,346
Pension Plan [Member] | Reclassification out of AOCI        
Loss and loss expense incurred 90 159 270 478
Other insurance expenses 327 534 981 1,601
Income before federal income tax 417 693 1,251 2,079
Total federal income tax expense (88) (145) (263) (436)
Net income (loss) 329 548 988 1,643
Held-to-maturity Securities [Member] | Reclassification out of AOCI        
Net realized and unrealized investment (losses) gains 1 (1) 1 (1)
Net investment income earned 0 2 1 (3)
Income before federal income tax 1 1 2 (4)
Total federal income tax expense 0 0 0 1
Net income (loss) 1 1 2 (3)
Available for sale securities, excluding credit losses [Member] | Reclassification out of AOCI        
Net realized and unrealized investment (losses) gains 14,235 (1,296) 48,396 (634)
Income before federal income tax 14,235 (1,296) 48,396 (634)
Total federal income tax expense (2,989) 272 (10,163) 133
Net income (loss) 11,246 (1,024) 38,233 (501)
Available for sale securities, including credit losses | Reclassification out of AOCI        
Net realized and unrealized investment (losses) gains 4,471 1,334 42,042 4,059
Income before federal income tax 4,471 1,334 42,042 4,059
Total federal income tax expense (939) (280) (8,828) (852)
Net income (loss) $ 3,532 $ 1,054 $ 33,214 $ 3,207