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Comprehensive Income (Reclassification out of AOCI) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Total net realized gains (losses) $ 1,734 $ 1,765 $ 689 $ (939)
Net investment income 41,430 31,182 78,849 61,951
Losses and loss expenses incurred 341,559 298,479 659,031 595,623
Policy acquisition costs 196,824 190,731 393,052 373,958
Income before federal income tax 58,929 62,311 126,503 114,186
Total federal income tax expense (17,503) (18,710) (34,637) (33,553)
Net income 41,426 43,601 91,866 80,633
Reclassification out of AOCI        
Net income (923) (172) 356 2,521
Reclassification out of AOCI | Pension Plan [Member]        
Losses and loss expenses incurred 111 329 221 658
Policy acquisition costs 397 1,188 794 2,375
Income before federal income tax 508 1,517 1,015 3,033
Total federal income tax expense (178) (532) (355) (1,062)
Net income 330 985 660 1,971
Reclassification out of AOCI | Held-to-maturity Securities [Member]        
Total net realized gains (losses) 17 60 30 88
Net investment income (60) (79) (122) (179)
Income before federal income tax (43) (19) (92) (91)
Total federal income tax expense 15 7 32 32
Net income (28) (12) (60) (59)
Reclassification out of AOCI | Available-for-sale Securities [Member]        
Total net realized gains (losses) (1,885) (1,762) (375) 937
Income before federal income tax (1,885) (1,762) (375) 937
Total federal income tax expense 660 617 131 (328)
Net income $ (1,225) $ (1,145) $ (244) $ 609