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Segment Information (Reconciliation of Segment Results to Income Before Federal Income Tax (Details)) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]    
Investment income $ 94,850 $ 32,250
Interest expense (7,166) (7,168)
Corporate expenses (12,108) (11,021)
Income before federal income tax 114,759 69,890
Preferred stock dividends (2,300) (2,300)
Income available to common stockholders, before federal income tax 112,459 67,590
Standard Commercial Lines    
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]    
Underwriting income (loss), before federal income tax 38,921 42,384
Standard Personal Lines    
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]    
Underwriting income (loss), before federal income tax (13,073) 6,520
E&S Lines    
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]    
Underwriting income (loss), before federal income tax 13,335 6,925
Operating Segments    
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]    
Underwriting income (loss), total all segments $ 134,033 $ 88,079