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Comprehensive Income (Reclassification out of AOCI) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Total net realized and unrealized (losses) gains $ (1,652) $ 1,734 $ (12,201) $ 689
Net investment income 45,553 41,430 88,784 78,849
Loss and loss expense incurred 366,328 341,559 751,269 659,031
Other insurance expenses 80,994 82,874 164,234 164,925
Income before federal income tax 72,525 58,929 92,456 126,503
Total federal income tax expense (13,706) (17,503) (14,712) (34,637)
Net income 58,819 41,426 77,744 91,866
Reclassification out of AOCI        
Net income 2,681 (923) 6,685 356
Pension Plan [Member] | Reclassification out of AOCI        
Loss and loss expense incurred 113 111 225 221
Other insurance expenses 418 397 838 794
Income before federal income tax 531 508 1,063 1,015
Total federal income tax expense (111) (178) (223) (355)
Net income 420 330 840 660
Held-to-maturity Securities [Member] | Reclassification out of AOCI        
Total net realized and unrealized (losses) gains (7) 17 (6) 30
Net investment income (1) (60) (14) (122)
Income before federal income tax (8) (43) (20) (92)
Total federal income tax expense 2 15 4 32
Net income (6) (28) (16) (60)
Available-for-sale Securities [Member] | Reclassification out of AOCI        
Total net realized and unrealized (losses) gains 2,870 (1,885) 7,419 (375)
Income before federal income tax 2,870 (1,885) 7,419 (375)
Total federal income tax expense (603) 660 (1,558) 131
Net income $ 2,267 $ (1,225) $ 5,861 $ (244)