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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, 2021
Mar. 31, 2020
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]    
Investment income $ 74,835 $ 11,301
Interest expense (7,359) (7,601)
Corporate expenses (9,554) (9,060)
Income before federal income tax 135,632 15,997
Preferred stock dividends (2,453) 0
Income available to common stockholders, before tax 133,179 15,997
Standard Commercial Lines    
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]    
Underwriting gain, before federal income tax 69,499 17,126
Standard Personal Lines    
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]    
Underwriting gain, before federal income tax 7,695 387
E&S Lines    
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]    
Underwriting gain, before federal income tax 516 3,844
Operating Segments    
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]    
Total income, before federal income tax all segments $ 152,545 $ 32,658