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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, 2022
Mar. 31, 2021
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]    
Investment income $ 32,250 $ 74,835
Interest expense (7,168) (7,359)
Corporate expenses (11,021) (9,554)
Income before federal income tax 69,890 135,632
Preferred stock dividends (2,300) (2,453)
Income available to common stockholders, before tax 67,590 133,179
Standard Commercial Lines    
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]    
Underwriting income, before federal income tax $ 42,384 $ 69,499
ROE Contribution 5.00% 8.60%
Standard Personal Lines    
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]    
Underwriting income, before federal income tax $ 6,520 $ 7,695
ROE Contribution 0.80% 1.00%
E&S Lines    
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]    
Underwriting income, before federal income tax $ 6,925 $ 516
ROE Contribution 0.80% 0.10%
Investments    
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]    
ROE Contribution 8.70% 8.90%
Operating Segments    
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]    
Total income, before federal income tax all segments $ 88,079 $ 152,545