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Comprehensive Income (Reclassification out of AOCI) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Net realized and unrealized investment gains (losses) $ (6,880) $ (25,681) $ (8,962) $ (108,913)
Net investment income earned 100,863 63,889 290,065 206,713
Loss and loss expense incurred 645,897 547,826 1,859,465 1,566,930
Other insurance expenses 108,504 102,806 325,949 298,310
Income before federal income tax 112,517 52,639 301,433 172,433
Total federal income tax expense (23,309) (10,114) (61,043) (34,058)
Net income (loss) 89,208 42,525 240,390 138,375
Reclassification out of AOCI        
Net income (loss) 6,203 15,108 11,424 72,437
Pension Plan [Member] | Reclassification out of AOCI        
Loss and loss expense incurred 173 90 521 270
Other insurance expenses 583 327 1,749 981
Income before federal income tax 756 417 2,270 1,251
Total federal income tax expense (158) (88) (476) (263)
Net income (loss) 598 329 1,794 988
Held-to-maturity Securities [Member] | Reclassification out of AOCI        
Net realized and unrealized investment gains (losses) 0 1 0 1
Net investment income earned 0 0 0 1
Income before federal income tax 0 1 0 2
Total federal income tax expense 0 0 0 0
Net income (loss) 0 1 0 2
Available for sale securities, excluding credit losses [Member] | Reclassification out of AOCI        
Net realized and unrealized investment gains (losses) 4,628 14,235 20,115 48,396
Income before federal income tax 4,628 14,235 20,115 48,396
Total federal income tax expense (972) (2,989) (4,224) (10,163)
Net income (loss) 3,656 11,246 15,891 38,233
Available for sale securities, including credit losses | Reclassification out of AOCI        
Net realized and unrealized investment gains (losses) 2,468 4,471 (7,925) 42,042
Income before federal income tax 2,468 4,471 (7,925) 42,042
Total federal income tax expense (519) (939) 1,664 (8,828)
Net income (loss) $ 1,949 $ 3,532 $ (6,261) $ 33,214