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Segment Information - Schedule of Combined Ratio (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Revenue from External Customer [Line Items]        
Net premiums earned $ 1,204,678 $ 1,112,228 $ 3,551,492 $ 3,243,403
Loss and loss expense incurred 819,031 765,658 2,389,254 2,395,498
Income (loss) before federal income tax 145,711 116,487 393,502 138,955
Total Insurance Operations        
Revenue from External Customer [Line Items]        
Net premiums earned 1,204,678 1,112,228 3,551,492 3,243,403
Loss and loss expense incurred 819,031 765,658 2,389,254 2,395,498
Net underwriting expenses incurred 368,073 339,969 1,099,316 991,646
Dividends to policyholders $ 876 $ 1,350 $ 3,010 $ 5,658
Ratio        
Loss and loss expense incurred (as a percent) 67.90% 68.80% 67.20% 73.80%
Net underwriting expenses incurred (as a percent) 30.60% 30.60% 31.00% 30.60%
Dividends to policyholders (as a percent) 0.10% 0.10% 0.10% 0.20%
Underwriting income (loss) (as a percent) 98.60% 99.50% 98.30% 104.60%
Standard Commercial Lines        
Revenue from External Customer [Line Items]        
Net premiums earned $ 947,272 $ 875,379 $ 2,797,117 $ 2,562,982
Loss and loss expense incurred 657,958 591,564 1,906,390 1,895,351
Net underwriting expenses incurred 298,614 275,146 891,119 805,154
Dividends to policyholders $ 876 $ 1,350 $ 3,010 $ 5,658
Ratio        
Loss and loss expense incurred (as a percent) 69.50% 67.60% 68.10% 74.00%
Net underwriting expenses incurred (as a percent) 31.50% 31.40% 31.90% 31.40%
Dividends to policyholders (as a percent) 0.10% 0.20% 0.10% 0.20%
Underwriting income (loss) (as a percent) 101.10% 99.20% 100.10% 105.60%
Standard Personal Lines        
Revenue from External Customer [Line Items]        
Net premiums earned $ 101,519 $ 107,521 $ 307,551 $ 317,788
Loss and loss expense incurred 89,290 106,113 235,936 291,897
Net underwriting expenses incurred $ 22,472 $ 25,182 $ 71,271 $ 74,301
Ratio        
Loss and loss expense incurred (as a percent) 88.00% 98.70% 76.70% 91.80%
Net underwriting expenses incurred (as a percent) 22.10% 23.40% 23.20% 23.40%
Underwriting income (loss) (as a percent) 110.10% 122.10% 99.90% 115.20%
E&S Lines        
Revenue from External Customer [Line Items]        
Net premiums earned $ 155,887 $ 129,328 $ 446,824 $ 362,633
Loss and loss expense incurred 71,783 67,981 246,928 208,250
Net underwriting expenses incurred $ 46,987 $ 39,641 $ 136,926 $ 112,191
Ratio        
Loss and loss expense incurred (as a percent) 46.10% 52.50% 55.30% 57.50%
Net underwriting expenses incurred (as a percent) 30.10% 30.70% 30.60% 30.90%
Underwriting income (loss) (as a percent) 76.20% 83.20% 85.90% 88.40%
Operating Segments        
Revenue from External Customer [Line Items]        
Loss and loss expense incurred $ 819,031 $ 765,658 $ 2,389,254 $ 2,395,498
Dividends to policyholders 876 1,350 3,010 5,658
Income (loss) before federal income tax 163,410 128,399 459,684 189,902
Operating Segments | Total Insurance Operations        
Revenue from External Customer [Line Items]        
Loss and loss expense incurred 819,031 765,658 2,389,254 2,395,498
Dividends to policyholders 876 1,350 3,010 5,658
Income (loss) before federal income tax 16,698 5,251 59,912 (149,399)
Operating Segments | Standard Commercial Lines        
Revenue from External Customer [Line Items]        
Loss and loss expense incurred 657,958 591,564 1,906,390 1,895,351
Dividends to policyholders 876 1,350 3,010 5,658
Income (loss) before federal income tax (10,176) 7,319 (3,402) (143,181)
Operating Segments | Standard Personal Lines        
Revenue from External Customer [Line Items]        
Loss and loss expense incurred 89,290 106,113 235,936 291,897
Dividends to policyholders 0 0 0 0
Income (loss) before federal income tax (10,243) (23,774) 344 (48,410)
Operating Segments | E&S Lines        
Revenue from External Customer [Line Items]        
Loss and loss expense incurred 71,783 67,981 246,928 208,250
Dividends to policyholders 0 0 0 0
Income (loss) before federal income tax $ 37,117 $ 21,706 $ 62,970 $ 42,192