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Comprehensive Income (Reclassification out of AOCI) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Net realized and unrealized investment gains (losses) $ 5,119 $ (44,666)
Net investment income earned 69,716 55,967
Loss and loss expense incurred 413,401 400,324
Other insurance expenses 88,910 95,346
Income before federal income tax 135,632 15,997
Total federal income tax expense (26,362) (761)
Net income 109,270 15,236
Reclassification out of AOCI    
Net income 4,970 22,036
Pension Plan [Member] | Reclassification out of AOCI    
Loss and loss expense incurred 159 162
Other insurance expenses 534 592
Income before federal income tax 693 754
Total federal income tax expense (146) (158)
Net income 547 596
Held-to-maturity Securities [Member] | Reclassification out of AOCI    
Net realized and unrealized investment gains (losses) 0 1
Net investment income earned (2) 24
Income before federal income tax (2) 25
Total federal income tax expense 0 (5)
Net income (2) 20
Available for sale securities, excluding credit losses [Member] | Reclassification out of AOCI    
Net realized and unrealized investment gains (losses) 604 11,327
Income before federal income tax 604 11,327
Total federal income tax expense (127) (2,379)
Net income 477 8,948
Available for sale securities, including credit losses | Reclassification out of AOCI    
Net realized and unrealized investment gains (losses) 4,997 15,787
Income before federal income tax 4,997 15,787
Total federal income tax expense (1,049) (3,315)
Net income $ 3,948 $ 12,472