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Comprehensive Income (Reclassification out of AOCI) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Net realized and unrealized investment (losses) gains $ (44,666) $ 13,451
Net investment income 55,967 50,618
Loss and loss expense incurred 400,324 386,579
Other insurance expenses 95,346 85,079
Income before federal income tax 15,997 73,694
Total federal income tax expense (761) (12,346)
Net income 15,236 61,348
Reclassification out of AOCI    
Net income 22,036 (333)
Pension Plan [Member] | Reclassification out of AOCI    
Loss and loss expense incurred 162 145
Other insurance expenses 592 519
Income before federal income tax 754 664
Total federal income tax expense (158) (139)
Net income 596 525
Held-to-maturity Securities [Member] | Reclassification out of AOCI    
Net realized and unrealized investment (losses) gains 1 0
Net investment income 24 (9)
Income before federal income tax 25 (9)
Total federal income tax expense (5) 2
Net income 20 (7)
Available for sale securities, excluding credit losses [Member] | Reclassification out of AOCI    
Net realized and unrealized investment (losses) gains 11,327 (1,077)
Income before federal income tax 11,327 (1,077)
Total federal income tax expense (2,379) 226
Net income 8,948 (851)
Available for sale securities, including credit losses | Reclassification out of AOCI    
Net realized and unrealized investment (losses) gains 15,787 0
Income before federal income tax 15,787 0
Total federal income tax expense (3,315) 0
Net income $ 12,472 $ 0