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Segment Information - Schedule of Reconciliation of Segment Results to Income (Loss) Before 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, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Investment income $ 123,148 $ 93,983 $ 339,301 $ 281,103
Interest expense (7,250) (7,186) (21,633) (21,610)
Corporate expenses (4,662) (5,871) (29,314) (27,308)
Income (loss), before federal income tax 116,487 112,517 138,955 301,433
Preferred stock dividends (2,300) (2,300) (6,900) (6,900)
Income (loss) available to common stockholders, before federal income tax 114,187 110,217 132,055 294,533
Standard Commercial Lines        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Underwriting income (loss) 7,319 41,339 (143,181) 102,406
Standard Personal Lines        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Underwriting income (loss) (23,774) (26,099) (48,410) (62,232)
E&S Lines        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Underwriting income (loss) 21,706 16,351 42,192 29,074
Investments        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Investment income 123,148 93,983 339,301 281,103
Operating Segments        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Total all segments $ 128,399 $ 125,574 $ 189,902 $ 350,351