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Comprehensive Income (Reclassification out of AOCI) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Net realized and unrealized gains (losses) $ 4,027 $ (1,652) $ 17,478 $ (12,201)
Net investment income (58,505) (45,553) (109,123) (88,784)
Loss and loss expense incurred 380,984 366,328 767,563 751,269
Other insurance expenses 86,662 80,994 171,741 164,234
Income before federal income tax 90,225 72,525 163,919 92,456
Total federal income tax expense (17,959) (13,706) (30,305) (14,712)
Net income 72,266 58,819 133,614 77,744
Reclassification out of AOCI        
Net income (520) 2,681 (853) 6,685
Pension Plan [Member] | Reclassification out of AOCI        
Loss and loss expense incurred 145 113 290 225
Other insurance expenses 519 418 1,038 838
Income before federal income tax 664 531 1,328 1,063
Total federal income tax expense (140) (111) (279) (223)
Net income 524 420 1,049 840
Held-to-maturity Securities [Member] | Reclassification out of AOCI        
Net realized and unrealized gains (losses) (9) (7) (9) (6)
Net investment income (12) (1) (21) (14)
Income before federal income tax (21) (8) (30) (20)
Total federal income tax expense 4 2 6 4
Net income (17) (6) (24) (16)
Available-for-sale Securities [Member] | Reclassification out of AOCI        
Net realized and unrealized gains (losses) (1,300) 2,870 (2,377) 7,419
Income before federal income tax (1,300) 2,870 (2,377) 7,419
Total federal income tax expense 273 (603) 499 (1,558)
Net income $ (1,027) $ 2,267 $ (1,878) $ 5,861