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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, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Investment income $ 38,208 $ 93,209 $ 97,800 $ 261,832
Interest expense (7,179) (7,242) (21,599) (21,967)
Corporate expenses (5,522) (4,270) (24,442) (22,936)
Income before federal income tax 52,639 92,636 172,433 381,466
Preferred stock dividends (2,300) (2,300) (6,900) (7,053)
Income available to common stockholders, before federal income tax 50,339 90,336 165,533 374,413
Standard Commercial Lines        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Underwriting income (loss), before federal income tax $ 22,501 $ 17,413 $ 111,593 $ 154,850
ROE Contribution 3.10% 2.10% 4.70% 6.20%
Standard Personal Lines        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Underwriting income (loss), before federal income tax $ (1,385) $ (11,146) $ (7,232) $ 2,193
ROE Contribution (0.20%) (1.30%) (0.30%) 0.10%
E&S Lines        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Underwriting income (loss), before federal income tax $ 6,016 $ 4,672 $ 16,313 $ 7,494
ROE Contribution 0.80% 0.50% 0.70% 0.30%
Investments        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
ROE Contribution 8.90% 11.00% 8.90% 10.10%
Operating Segments        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Underwriting income (loss), total all segments $ 65,340 $ 104,148 $ 218,474 $ 426,369