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Comprehensive Income (Reclassification out of AOCI) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Total net realized and unrealized losses $ (10,549) $ (1,045)
Net investment income 43,231 37,419
Loss and loss expense incurred 384,941 317,472
Other insurance expenses 83,240 82,051
Income before federal income tax 19,931 67,574
Total federal income tax expense (1,006) (17,134)
Net income 18,925 50,440
Reclassification out of AOCI    
Net income 4,004 1,279
Pension Plan [Member] | Reclassification out of AOCI    
Loss and loss expense incurred 112 110
Other insurance expenses 420 397
Income before federal income tax 532 507
Total federal income tax expense (112) (177)
Net income 420 330
Held-to-maturity Securities [Member] | Reclassification out of AOCI    
Total net realized and unrealized losses 1 13
Net investment income (13) (62)
Income before federal income tax (12) (49)
Total federal income tax expense 2 17
Net income (10) (32)
Available-for-sale Securities [Member] | Reclassification out of AOCI    
Total net realized and unrealized losses 4,549 1,510
Income before federal income tax 4,549 1,510
Total federal income tax expense (955) (529)
Net income $ 3,594 $ 981