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Segment Information - Schedule of Revenue by Segment (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Segment Reporting Information [Line Items]        
Net premiums earned: $ 1,112,228 $ 981,917 $ 3,243,403 $ 2,826,403
Miscellaneous income 8,930 5,181 22,566 13,919
Net investment income earned 117,759 100,863 334,250 290,065
Net realized and unrealized investment gains (losses) 5,389 (6,880) 5,051 (8,962)
Total Investments revenue 123,148 93,983 339,301 281,103
Total revenues 1,244,306 1,081,081 3,605,270 3,121,425
Standard Commercial Lines        
Segment Reporting Information [Line Items]        
Total revenues 883,568 789,934 2,583,519 2,292,007
Standard Commercial Lines | General liability        
Segment Reporting Information [Line Items]        
Net premiums earned: 286,641 261,551 840,153 759,410
Standard Commercial Lines | Commercial automobile        
Segment Reporting Information [Line Items]        
Net premiums earned: 269,036 234,622 781,408 677,060
Standard Commercial Lines | Commercial property        
Segment Reporting Information [Line Items]        
Net premiums earned: 174,855 152,495 504,919 429,135
Standard Commercial Lines | Workers compensation        
Segment Reporting Information [Line Items]        
Net premiums earned: 81,296 81,672 251,389 254,602
Standard Commercial Lines | Businessowners' policies        
Segment Reporting Information [Line Items]        
Net premiums earned: 43,091 36,016 124,653 103,572
Standard Commercial Lines | Bonds        
Segment Reporting Information [Line Items]        
Net premiums earned: 12,511 11,715 37,067 34,731
Standard Commercial Lines | Other        
Segment Reporting Information [Line Items]        
Net premiums earned: 7,949 7,257 23,393 21,142
Standard Commercial Lines | Miscellaneous income        
Segment Reporting Information [Line Items]        
Miscellaneous income 8,189 4,606 20,537 12,355
Standard Personal Lines        
Segment Reporting Information [Line Items]        
Total revenues 108,213 95,744 319,715 265,773
Standard Personal Lines | Miscellaneous income        
Segment Reporting Information [Line Items]        
Miscellaneous income 692 575 1,927 1,564
Standard Personal Lines | Personal automobile        
Segment Reporting Information [Line Items]        
Net premiums earned: 56,599 51,906 171,103 145,050
Standard Personal Lines | Homeowners        
Segment Reporting Information [Line Items]        
Net premiums earned: 47,251 40,175 137,419 112,090
Standard Personal Lines | Other        
Segment Reporting Information [Line Items]        
Net premiums earned: 3,671 3,088 9,266 7,069
E&S Lines        
Segment Reporting Information [Line Items]        
Total revenues 129,377 101,420 362,735 282,542
E&S Lines | Miscellaneous income        
Segment Reporting Information [Line Items]        
Miscellaneous income 49 0 102 0
E&S Lines | Casualty lines        
Segment Reporting Information [Line Items]        
Net premiums earned: 77,471 67,718 222,996 190,686
E&S Lines | Property lines        
Segment Reporting Information [Line Items]        
Net premiums earned: $ 51,857 $ 33,702 $ 139,637 $ 91,856