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Comprehensive Income (Reclassification out of AOCI) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Net realized and unrealized investment gains (losses) $ 12,649 $ 4,027 $ (32,017) $ 17,478
Net investment income earned 34,444 58,505 90,411 109,123
Loss and loss expense incurred 403,949 380,984 804,273 767,563
Other insurance expenses 84,601 86,662 179,947 171,741
Income before federal income tax 42,693 90,225 58,690 163,919
Total federal income tax expense (8,510) (17,959) (9,271) (30,305)
Net income 34,183 72,266 49,419 133,614
Reclassification out of AOCI        
Net income (4,652) (520) 17,384 (853)
Pension Plan [Member] | Reclassification out of AOCI        
Loss and loss expense incurred 162 145 324 290
Other insurance expenses 591 519 1,183 1,038
Income before federal income tax 753 664 1,507 1,328
Total federal income tax expense (158) (140) (316) (279)
Net income 595 524 1,191 1,049
Held-to-maturity Securities [Member] | Reclassification out of AOCI        
Net realized and unrealized investment gains (losses) 0 (9) 1 (9)
Net investment income earned (31) (12) (7) (21)
Income before federal income tax (31) (21) (6) (30)
Total federal income tax expense 6 4 1 6
Net income (25) (17) (5) (24)
Available for sale securities, excluding credit losses [Member] | Reclassification out of AOCI        
Net realized and unrealized investment gains (losses) (1,686) (1,300) 9,641 (2,377)
Income before federal income tax (1,686) (1,300) 9,641 (2,377)
Total federal income tax expense 354 273 (2,025) 499
Net income (1,332) (1,027) 7,616 (1,878)
Available for sale securities, including credit losses | Reclassification out of AOCI        
Net realized and unrealized investment gains (losses) (4,924) 0 10,863 0
Income before federal income tax (4,924) 0 10,863 0
Total federal income tax expense 1,034 0 (2,281) 0
Net income $ (3,890) $ 0 $ 8,582 $ 0