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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, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Investment income $ 93,209 $ 75,906 $ 261,832 $ 134,300
Interest expense (7,242) (7,781) (21,967) (23,310)
Corporate expenses (4,270) (3,905) (22,936) (19,310)
Income before federal income tax 92,636 85,257 381,466 143,947
Preferred stock dividends (2,300) 0 (7,053) 0
Income available to common stockholders, before tax 90,336 85,257 374,413 143,947
Standard Commercial Lines        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Underwriting gain (loss), before federal income tax $ 17,413 $ 42,718 $ 154,850 $ 76,574
ROE Contribution 2.10% 5.70% 6.20% 3.50%
Standard Personal Lines        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Underwriting gain (loss), before federal income tax $ (11,146) $ (14,404) $ 2,193 $ (20,342)
ROE Contribution (1.30%) (1.90%) 0.10% (0.90%)
E&S Lines        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Underwriting gain (loss), before federal income tax $ 4,672 $ (7,277) $ 7,494 $ (3,965)
ROE Contribution 0.50% (1.00%) 0.30% (0.20%)
Investments        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
ROE Contribution 11.00% 9.40% 10.10% 7.50%
Operating Segments        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Total income, before federal income tax all segments $ 104,148 $ 96,943 $ 426,369 $ 186,567