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Segment Information (Income From Continuing Operations, Before and After Federal Income Tax) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Net investment income earned $ 288,155 $ 326,589 $ 227,107
Net realized and unrealized investment (losses) gains (114,808) 17,599 (4,217)
Total investment revenues 173,347 344,188 222,890
Tax on investment income 31,846 67,284 41,609
Total investment income, after federal income tax 141,501 276,904 181,281
Standard Commercial Lines [Member]      
Underwriting income (loss), before federal income tax 143,696 198,596 151,731
Underwriting income (loss), after federal income tax $ 113,520 $ 156,891 $ 119,867
Combined ratio 94.80% 91.90% 92.90%
Return on equity contribution 4.60% 5.90% 5.10%
Standard Personal Lines      
Underwriting income (loss), before federal income tax $ (7,193) $ 3,966 $ (15,508)
Underwriting income (loss), after federal income tax $ (5,682,000) $ 3,133 $ (12,251)
Combined ratio 102.40% 98.60% 105.20%
Return on equity contribution (0.20%) 0.10% (0.50%)
E&S Lines [Member]      
Underwriting income (loss), before federal income tax $ 30,299 $ 16,030 $ 126
Underwriting income (loss), after federal income tax $ 23,936,000 $ 12,664 $ 100
Combined ratio 90.90% 94.30% 99.90%
Return on equity contribution 1.00% 0.50% 0.00%
Investments SIGI      
Return on equity contribution 9.40% 9.90% 7.80%