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Segment Information (Reconciliation of Segment Results to Income Before Federal Income Tax (Details)) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Investment income $ 93,788 $ 47,093 $ 168,623 $ 58,394
Interest expense (7,366) (7,928) (14,725) (15,529)
Corporate expenses (9,112) (6,345) (18,666) (15,405)
Income before federal income tax 153,198 42,693 288,830 58,690
Preferred stock dividends (2,300) 0 (4,753) 0
Income available to common stockholders, before tax 150,898 42,693 284,077 58,690
Standard Commercial Lines        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Underwriting gain (loss), before federal income tax $ 67,938 $ 16,730 $ 137,437 $ 33,856
ROE Contribution 8.20% 2.40% 8.30% 2.40%
Standard Personal Lines        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Underwriting gain (loss), before federal income tax $ 5,644 $ (6,325) $ 13,339 $ (5,938)
ROE Contribution 0.70% (0.90%) 0.80% (0.40%)
E&S Lines        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Underwriting gain (loss), before federal income tax $ 2,306 $ (532) $ 2,822 $ 3,312
ROE Contribution 0.30% (0.10%) 0.20% 0.20%
Investments        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
ROE Contribution 10.30% 5.20% 9.50% 6.60%
Operating Segments        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Total income, before federal income tax all segments $ 169,676 $ 56,966 $ 322,221 $ 89,624