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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, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Segment Reporting Information [Line Items]        
Net investment income earned $ 63,889 $ 93,032 $ 206,713 $ 246,479
Net realized and unrealized investment (losses) gains (25,681) 177 (108,913) 15,353
Total investment segment income, before federal income tax 38,208 93,209 97,800 261,832
Tax on investments segment income 6,964 18,379 17,136 51,229
Total investment segment income, after federal income tax 31,244 74,830 80,664 210,603
Standard Commercial Lines        
Segment Reporting Information [Line Items]        
Underwriting income (loss), before federal income tax 22,501 17,413 111,593 154,850
Underwriting income (loss), after federal income tax $ 17,776 $ 13,756 $ 88,158 $ 122,332
Combined ratio 96.80% 97.20% 94.50% 91.40%
ROE Contribution 3.10% 2.10% 4.70% 6.20%
Standard Personal Lines        
Segment Reporting Information [Line Items]        
Underwriting income (loss), before federal income tax $ (1,385) $ (11,146) $ (7,232) $ 2,193
Underwriting income (loss), after federal income tax $ (1,094) $ (8,805) $ (5,713) $ 1,732
Combined ratio 101.80% 115.20% 103.30% 99.00%
ROE Contribution (0.20%) (1.30%) (0.30%) 0.10%
E&S Lines        
Segment Reporting Information [Line Items]        
Underwriting income (loss), before federal income tax $ 6,016 $ 4,672 $ 16,313 $ 7,494
Underwriting income (loss), after federal income tax $ 4,753 $ 3,691 $ 12,887 $ 5,920
Combined ratio 93.00% 93.70% 93.30% 96.30%
ROE Contribution 0.80% 0.50% 0.70% 0.30%
Investments        
Segment Reporting Information [Line Items]        
ROE Contribution 8.90% 11.00% 8.90% 10.10%