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Segment Information - Schedule of Revenue by Segment (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Revenue from External Customer [Line Items]        
Net premiums earned $ 1,188,057 $ 1,080,231 $ 2,346,814 $ 2,131,175
Miscellaneous income 6,548 5,835 12,057 13,636
Net investment income earned 127,968 108,642 248,659 216,491
Net realized and unrealized investment gains (losses) 4,172 1,297 4,401 (338)
Total Investments revenue 132,140 109,939 253,060 216,153
Total revenues 1,326,745 1,196,005 2,611,931 2,360,964
Standard Commercial Lines        
Revenue from External Customer [Line Items]        
Net premiums earned 937,635 853,493 1,849,845 1,687,603
Total revenues 943,555 858,707 1,860,625 1,699,951
Standard Personal Lines        
Revenue from External Customer [Line Items]        
Net premiums earned 102,377 106,421 206,032 210,267
Total revenues 102,954 107,015 207,180 211,502
E&S Lines        
Revenue from External Customer [Line Items]        
Net premiums earned 148,045 120,317 290,937 233,305
Total revenues 148,096 120,344 291,066 233,358
General liability | Standard Commercial Lines        
Revenue from External Customer [Line Items]        
Net premiums earned 305,843 280,097 600,530 553,512
Commercial automobile | Standard Commercial Lines        
Revenue from External Customer [Line Items]        
Net premiums earned 288,759 260,652 572,344 512,372
Commercial property | Standard Commercial Lines        
Revenue from External Customer [Line Items]        
Net premiums earned 191,027 168,511 377,557 330,064
Workers compensation | Standard Commercial Lines        
Revenue from External Customer [Line Items]        
Net premiums earned 82,024 82,316 161,060 170,093
Businessowners' policies | Standard Commercial Lines        
Revenue from External Customer [Line Items]        
Net premiums earned 48,416 41,641 95,309 81,562
Bonds | Standard Commercial Lines        
Revenue from External Customer [Line Items]        
Net premiums earned 13,255 12,468 26,513 24,556
Other | Standard Commercial Lines        
Revenue from External Customer [Line Items]        
Net premiums earned 8,311 7,808 16,532 15,444
Miscellaneous income | Standard Commercial Lines        
Revenue from External Customer [Line Items]        
Miscellaneous income 5,920 5,214 10,780 12,348
Miscellaneous income | Standard Personal Lines        
Revenue from External Customer [Line Items]        
Miscellaneous income 577 594 1,148 1,235
Miscellaneous income | E&S Lines        
Revenue from External Customer [Line Items]        
Miscellaneous income 51 27 129 53
Personal automobile | Standard Personal Lines        
Revenue from External Customer [Line Items]        
Net premiums earned 51,287 57,544 104,255 114,504
Homeowners | Standard Personal Lines        
Revenue from External Customer [Line Items]        
Net premiums earned 48,312 46,055 96,255 90,168
Other | Standard Personal Lines        
Revenue from External Customer [Line Items]        
Net premiums earned 2,778 2,822 5,522 5,595
Casualty lines | E&S Lines        
Revenue from External Customer [Line Items]        
Net premiums earned 87,400 73,887 172,519 145,525
Property lines | E&S Lines        
Revenue from External Customer [Line Items]        
Net premiums earned $ 60,645 $ 46,430 $ 118,418 $ 87,780