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Segment Information (Reconciliation of Segment Results to Income Before 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, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Investment income $ 93,983 $ 38,208 $ 281,103 $ 97,800
Interest expense (7,186) (7,179) (21,610) (21,599)
Corporate expenses (5,871) (5,522) (27,308) (24,442)
Income before federal income tax 112,517 52,639 301,433 172,433
Preferred stock dividends (2,300) (2,300) (6,900) (6,900)
Income available to common stockholders, before federal income tax 110,217 50,339 294,533 165,533
Standard Commercial Lines        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Underwriting income (loss), before federal income tax 41,339 22,501 102,406 111,593
Standard Personal Lines        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Underwriting income (loss), before federal income tax (26,099) (1,385) (62,232) (7,232)
E&S Lines        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Underwriting income (loss), before federal income tax 16,351 6,016 29,074 16,313
Operating Segments        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Underwriting income (loss), total all segments $ 125,574 $ 65,340 $ 350,351 $ 218,474