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Segment Information - Income Before and After Federal Income Tax (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Segment Reporting Information [Line Items]    
Net investment income earned $ 107,849 $ 91,506
Net realized and unrealized investment gains (losses) (1,635) 3,344
Total investments segment income, before federal income tax 106,214 94,850
Tax on investments segment income 21,866 19,156
Total investments segment income, after federal income tax 84,348 75,694
Standard Commercial Lines    
Segment Reporting Information [Line Items]    
Underwriting income (loss), before federal income tax 10,381 38,921
Underwriting income (loss), after federal income tax $ 8,201 $ 30,748
Combined ratio 98.80% 94.70%
ROE contribution 1.20% 5.10%
Standard Personal Lines    
Segment Reporting Information [Line Items]    
Underwriting income (loss), before federal income tax $ (5,335) $ (13,073)
Underwriting income (loss), after federal income tax $ (4,215) $ (10,328)
Combined ratio 105.10% 116.00%
ROE contribution (0.60%) (1.70%)
E&S Lines    
Segment Reporting Information [Line Items]    
Underwriting income (loss), before federal income tax $ 13,985 $ 13,335
Underwriting income (loss), after federal income tax $ 11,048 $ 10,535
Combined ratio 87.60% 85.00%
ROE contribution 1.60% 1.80%
Investments:    
Segment Reporting Information [Line Items]    
ROE contribution 12.30% 12.20%
Total investments segment income, before federal income tax $ 106,214 $ 94,850