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Segment Information - Schedule of Segments Pre and After Tax Income, Significant Expenses and Reconciliations (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]        
Total segment revenues $ 1,360,110 $ 1,244,306 $ 3,972,041 $ 3,605,270
(Favorable)/unfavorable prior year casualty reserve development     70,096 182,748
Current year casualty loss costs     2,319,158 2,212,750
Net 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 federal income tax expense (benefit) (30,371) (24,209) (82,323) (27,478)
Net income (loss) 115,340 92,278 311,179 111,477
Interest expense (13,253) (7,250) (36,082) (21,633)
Corporate expenses (4,446) (4,662) (30,100) (29,314)
Preferred stock dividends (2,300) (2,300) (6,900) (6,900)
Net income (loss) available to common stockholders, basic 113,040 89,978 304,279 104,577
Casualty lines        
Revenue from External Customer [Line Items]        
(Favorable)/unfavorable prior year casualty reserve development     90,000 211,000
Total Insurance Operations        
Revenue from External Customer [Line Items]        
Net 819,031 765,658 2,389,254 2,395,498
Dividends to policyholders 876 1,350 3,010 5,658
Standard Commercial Lines        
Revenue from External Customer [Line Items]        
Total segment revenues 955,424 883,568 2,816,049 2,583,519
Net 657,958 591,564 1,906,390 1,895,351
Dividends to policyholders 876 1,350 3,010 5,658
Standard Personal Lines        
Revenue from External Customer [Line Items]        
Total segment revenues 102,053 108,213 309,233 319,715
Net 89,290 106,113 235,936 291,897
E&S Lines        
Revenue from External Customer [Line Items]        
Total segment revenues 155,921 129,377 446,987 362,735
Net 71,783 67,981 246,928 208,250
Operating Segments        
Revenue from External Customer [Line Items]        
Total segment revenues 1,360,110 1,244,306 3,972,041 3,605,270
Net catastrophe losses 24,899 148,804 148,188 294,579
Non-catastrophe property loss and loss expense 169,630 146,747 521,565 503,407
Net 819,031 765,658 2,389,254 2,395,498
Commissions to distribution partners 212,527 198,915 636,454 577,467
Salaries and employee benefits 96,406 90,368 287,392 262,094
Other segment expenses 67,860 59,616 196,247 174,651
Total net underwriting expenses incurred 376,793 348,899 1,120,093 1,014,212
Dividends to policyholders 876 1,350 3,010 5,658
Income (loss) before federal income tax 163,410 128,399 459,684 189,902
Total federal income tax expense (benefit) (33,887) (26,614) (95,503) (38,655)
Net income (loss) 129,523 101,785 364,181 151,247
Operating Segments | Casualty lines        
Revenue from External Customer [Line Items]        
(Favorable)/unfavorable prior year casualty reserve development 40,000 0 90,000 211,000
Current year casualty loss costs 584,502 470,107 1,629,501 1,386,512
Operating Segments | Total Insurance Operations        
Revenue from External Customer [Line Items]        
Total segment revenues 1,213,398 1,121,158 3,572,269 3,265,969
Net catastrophe losses 24,899 148,804 148,188 294,579
Non-catastrophe property loss and loss expense 169,630 146,747 521,565 503,407
Net 819,031 765,658 2,389,254 2,395,498
Commissions to distribution partners 212,527 198,915 636,454 577,467
Salaries and employee benefits 96,406 90,368 287,392 262,094
Other segment expenses 67,860 59,616 196,247 174,651
Total net underwriting expenses incurred 376,793 348,899 1,120,093 1,014,212
Dividends to policyholders 876 1,350 3,010 5,658
Income (loss) before federal income tax 16,698 5,251 59,912 (149,399)
Total federal income tax expense (benefit) (3,507) (1,103) (12,582) 31,374
Net income (loss) 13,191 4,148 47,330 (118,025)
Operating Segments | Total Insurance Operations | Casualty lines        
Revenue from External Customer [Line Items]        
(Favorable)/unfavorable prior year casualty reserve development 40,000 0 90,000 211,000
Current year casualty loss costs 584,502 470,107 1,629,501 1,386,512
Operating Segments | Standard Commercial Lines        
Revenue from External Customer [Line Items]        
Total segment revenues 955,424 883,568 2,816,049 2,583,519
Net catastrophe losses 15,013 100,429 85,705 189,781
Non-catastrophe property loss and loss expense 118,749 95,864 379,423 335,410
Net 657,958 591,564 1,906,390 1,895,351
Commissions to distribution partners 173,294 162,947 516,871 474,267
Salaries and employee benefits 79,150 74,279 237,604 215,667
Other segment expenses 54,322 46,109 155,576 135,757
Total net underwriting expenses incurred 306,766 283,335 910,051 825,691
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 Commercial Lines | Casualty lines        
Revenue from External Customer [Line Items]        
(Favorable)/unfavorable prior year casualty reserve development 35,000 0 80,000 211,000
Current year casualty loss costs 489,196 395,271 1,361,262 1,159,160
Operating Segments | Standard Personal Lines        
Revenue from External Customer [Line Items]        
Total segment revenues 102,053 108,213 309,233 319,715
Net catastrophe losses 12,160 41,688 33,864 78,929
Non-catastrophe property loss and loss expense 39,907 37,964 104,667 125,192
Net 89,290 106,113 235,936 291,897
Commissions to distribution partners 4,083 7,498 17,958 23,121
Salaries and employee benefits 9,620 9,291 27,045 27,330
Other segment expenses 9,303 9,085 27,950 25,777
Total net underwriting expenses incurred 23,006 25,874 72,953 76,228
Dividends to policyholders 0 0 0 0
Income (loss) before federal income tax (10,243) (23,774) 344 (48,410)
Operating Segments | Standard Personal Lines | Casualty lines        
Revenue from External Customer [Line Items]        
(Favorable)/unfavorable prior year casualty reserve development 5,000 0 10,000 0
Current year casualty loss costs 32,223 26,461 87,405 87,776
Operating Segments | E&S Lines        
Revenue from External Customer [Line Items]        
Total segment revenues 155,921 129,377 446,987 362,735
Net catastrophe losses (2,274) 6,687 28,619 25,869
Non-catastrophe property loss and loss expense 10,974 12,919 37,475 42,805
Net 71,783 67,981 246,928 208,250
Commissions to distribution partners 35,150 28,470 101,625 80,079
Salaries and employee benefits 7,636 6,798 22,743 19,097
Other segment expenses 4,235 4,422 12,721 13,117
Total net underwriting expenses incurred 47,021 39,690 137,089 112,293
Dividends to policyholders 0 0 0 0
Income (loss) before federal income tax 37,117 21,706 62,970 42,192
Operating Segments | E&S Lines | Casualty lines        
Revenue from External Customer [Line Items]        
(Favorable)/unfavorable prior year casualty reserve development 0 0 0 0
Current year casualty loss costs 63,083 48,375 180,834 139,576
Operating Segments | Investments        
Revenue from External Customer [Line Items]        
Total segment revenues 146,712 123,148 399,772 339,301
Net catastrophe losses 0 0 0 0
Non-catastrophe property loss and loss expense 0 0 0 0
Net 0 0 0 0
Commissions to distribution partners 0 0 0 0
Salaries and employee benefits 0 0 0 0
Other segment expenses 0 0 0 0
Total net underwriting expenses incurred 0 0 0 0
Dividends to policyholders 0 0 0
Income (loss) before federal income tax 146,712 123,148 399,772 339,301
Total federal income tax expense (benefit) (30,380) (25,511) (82,921) (70,029)
Net income (loss) 116,332 97,637 316,851 269,272
Operating Segments | Investments | Casualty lines        
Revenue from External Customer [Line Items]        
(Favorable)/unfavorable prior year casualty reserve development 0 0 0 0
Current year casualty loss costs 0 0 0 0
Other        
Revenue from External Customer [Line Items]        
Total federal income tax expense (benefit) $ 3,516 $ 2,405 $ 13,180 $ 11,177