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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, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Segment Reporting Information [Line Items]        
Net investment income earned $ 100,863 $ 63,889 $ 290,065 $ 206,713
Net realized and unrealized investment gains (losses) (6,880) (25,681) (8,962) (108,913)
Total investments segment income, before federal income tax 93,983 38,208 281,103 97,800
Tax on investments segment income 19,191 6,964 57,092 17,136
Total investments segment income, after federal income tax 74,792 31,244 224,011 80,664
Standard Commercial Lines        
Segment Reporting Information [Line Items]        
Underwriting income (loss), before federal income tax 41,339 22,501 102,406 111,593
Underwriting income (loss), after federal income tax $ 32,658 $ 17,776 $ 80,901 $ 88,158
Combined ratio 94.70% 96.80% 95.50% 94.50%
ROE contribution 5.40% 3.10% 4.40% 4.70%
Standard Personal Lines        
Segment Reporting Information [Line Items]        
Underwriting income (loss), before federal income tax $ (26,099) $ (1,385) $ (62,232) $ (7,232)
Underwriting income (loss), after federal income tax $ (20,618) $ (1,094) $ (49,163) $ (5,713)
Combined ratio 127.40% 101.80% 123.60% 103.30%
ROE contribution (3.40%) (0.20%) (2.70%) (0.30%)
E&S Lines        
Segment Reporting Information [Line Items]        
Underwriting income (loss), before federal income tax $ 16,351 $ 6,016 $ 29,074 $ 16,313
Underwriting income (loss), after federal income tax $ 12,917 $ 4,753 $ 22,968 $ 12,887
Combined ratio 83.90% 93.00% 89.70% 93.30%
ROE contribution 2.10% 0.80% 1.30% 0.70%
Investments        
Segment Reporting Information [Line Items]        
ROE contribution 13.10% 8.90% 12.70% 8.90%