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Segment Information (Income Before and After Federal Income Tax) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Segment Reporting Information [Line Items]        
Net investment income $ 93,032 $ 68,185 $ 246,479 $ 158,596
Net realized and unrealized investment gains (losses) 177 7,721 15,353 (24,296)
Total investment segment income, before federal income tax 93,209 75,906 261,832 134,300
Tax on investment income 18,379 14,676 51,229 24,338
Total investment segment income, after federal income tax 74,830 61,230 210,603 109,962
Standard Commercial Lines        
Segment Reporting Information [Line Items]        
Underwriting gain (loss), before federal income tax 17,413 42,718 154,850 76,574
Underwriting gain (loss), after federal income tax $ 13,756 $ 33,746 $ 122,332 $ 60,493
Combined ratio 97.20% 92.30% 91.40% 95.10%
ROE Contribution 2.10% 5.70% 6.20% 3.50%
Standard Personal Lines        
Segment Reporting Information [Line Items]        
Underwriting gain (loss), before federal income tax $ (11,146) $ (14,404) $ 2,193 $ (20,342)
Underwriting gain (loss), after federal income tax $ (8,805) $ (11,379) $ 1,732 $ (16,070)
Combined ratio 115.20% 119.00% 99.00% 109.10%
ROE Contribution (1.30%) (1.90%) 0.10% (0.90%)
E&S Lines        
Segment Reporting Information [Line Items]        
Underwriting gain (loss), before federal income tax $ 4,672 $ (7,277) $ 7,494 $ (3,965)
Underwriting gain (loss), after federal income tax $ 3,691 $ (5,748) $ 5,920 $ (3,132)
Combined ratio 93.70% 112.00% 96.30% 102.20%
ROE Contribution 0.50% (1.00%) 0.30% (0.20%)
Investments        
Segment Reporting Information [Line Items]        
ROE Contribution 11.00% 9.40% 10.10% 7.50%