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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, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Segment Reporting Information [Line Items]        
Net investment income earned $ 70,222 $ 83,731 $ 142,824 $ 153,447
Net realized and unrealized investment (losses) gains (42,880) 10,057 (83,232) 15,176
Total investment segment income, before federal income tax 27,342 93,788 59,592 168,623
Tax on investments segment income 4,559 18,402 10,172 32,850
Total investment segment income, after federal income tax 22,783 75,386 49,420 135,773
Standard Commercial Lines        
Segment Reporting Information [Line Items]        
Underwriting income (loss), before federal income tax 46,708 67,938 89,092 137,437
Underwriting income, after federal income tax $ 36,899 $ 53,671 $ 70,383 $ 108,575
Combined ratio 93.10% 88.70% 93.40% 88.40%
ROE Contribution 6.00% 8.20% 5.50% 8.30%
Standard Personal Lines        
Segment Reporting Information [Line Items]        
Underwriting income (loss), before federal income tax $ (12,367) $ 5,644 $ (5,847) $ 13,339
Underwriting income, after federal income tax $ (9,770) $ 4,459 $ (4,619) $ 10,538
Combined ratio 116.90% 92.30% 104.00% 90.90%
ROE Contribution (1.60%) 0.70% (0.40%) 0.80%
E&S Lines        
Segment Reporting Information [Line Items]        
Underwriting income (loss), before federal income tax $ 3,372 $ 2,306 $ 10,297 $ 2,822
Underwriting income, after federal income tax $ 2,664 $ 1,822 $ 8,135 $ 2,229
Combined ratio 95.80% 96.60% 93.50% 97.80%
ROE Contribution 0.40% 0.30% 0.60% 0.20%
Investments        
Segment Reporting Information [Line Items]        
ROE Contribution 9.10% 10.30% 8.90% 9.50%