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Segment Information (Income Before and After Federal Income Tax) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Segment Reporting Information [Line Items]        
Net investment income $ 83,731 $ 34,444 $ 153,447 $ 90,411
Net realized and unrealized investment gains (losses) 10,057 12,649 15,176 (32,017)
Total investment segment income, before federal income tax 93,788 47,093 168,623 58,394
Tax on investment income 18,402 8,558 32,850 9,662
Total investment segment income, after federal income tax 75,386 38,535 135,773 48,732
Standard Commercial Lines        
Segment Reporting Information [Line Items]        
Underwriting gain (loss), before federal income tax 67,938 16,730 137,437 33,856
Underwriting gain (loss), after federal income tax $ 53,671 $ 13,217 $ 108,575 $ 26,747
Combined ratio 88.70% 96.70% 88.40% 96.70%
ROE Contribution 8.20% 2.40% 8.30% 2.40%
Standard Personal Lines        
Segment Reporting Information [Line Items]        
Underwriting gain (loss), before federal income tax $ 5,644 $ (6,325) $ 13,339 $ (5,938)
Underwriting gain (loss), after federal income tax $ 4,459 $ (4,997) $ 10,538 $ (4,691)
Combined ratio 92.30% 108.80% 90.90% 104.00%
ROE Contribution 0.70% (0.90%) 0.80% (0.40%)
E&S Lines        
Segment Reporting Information [Line Items]        
Underwriting gain (loss), before federal income tax $ 2,306 $ (532) $ 2,822 $ 3,312
Underwriting gain (loss), after federal income tax $ 1,822 $ (420) $ 2,229 $ 2,616
Combined ratio 96.60% 100.90% 97.80% 97.20%
ROE Contribution 0.30% (0.10%) 0.20% 0.20%
Investments        
Segment Reporting Information [Line Items]        
ROE Contribution 10.30% 5.20% 9.50% 6.60%