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Segment Information - Schedule of Income (Loss) Before and After Federal Income Tax (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Segment Reporting Information [Line Items]        
Net investment income earned $ 117,759 $ 100,863 $ 334,250 $ 290,065
Net realized and unrealized investment gains (losses) 5,389 (6,880) 5,051 (8,962)
Total investments segment income, before federal income tax 123,148 93,983 339,301 281,103
Tax on investments segment income 25,511 19,191 70,029 57,092
Total investments segment income, after federal income tax 97,637 74,792 269,272 224,011
Standard Commercial Lines        
Segment Reporting Information [Line Items]        
Underwriting income (loss), before federal income tax 7,319 41,339 (143,181) 102,406
Underwriting income (loss), after federal income tax $ 5,782 $ 32,658 $ (113,113) $ 80,901
Combined ratio 99.20% 94.70% 105.60% 95.50%
ROE contribution 0.80% 5.40% (5.40%) 4.40%
Standard Personal Lines        
Segment Reporting Information [Line Items]        
Underwriting income (loss), before federal income tax $ (23,774) $ (26,099) $ (48,410) $ (62,232)
Underwriting income (loss), after federal income tax $ (18,781) $ (20,618) $ (38,244) $ (49,163)
Combined ratio 122.10% 127.40% 115.20% 123.60%
ROE contribution (2.60%) (3.40%) (1.80%) (2.70%)
E&S Lines        
Segment Reporting Information [Line Items]        
Underwriting income (loss), before federal income tax $ 21,706 $ 16,351 $ 42,192 $ 29,074
Underwriting income (loss), after federal income tax $ 17,148 $ 12,917 $ 33,332 $ 22,968
Combined ratio 83.20% 83.90% 88.40% 89.70%
ROE contribution 2.40% 2.10% 1.60% 1.30%
Investments        
Segment Reporting Information [Line Items]        
ROE contribution 13.10% 13.10% 12.60% 12.70%
Total investments segment income, before federal income tax $ 123,148 $ 93,983 $ 339,301 $ 281,103