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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 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Revenue from External Customer [Line Items]        
Total revenues $ 1,326,745 $ 1,196,005 $ 2,611,931 $ 2,360,964
(Favorable)/unfavorable prior year casualty reserve development     34,648 187,121
Current year casualty loss costs     1,535,575 1,442,719
Net 823,898 925,548 1,570,223 1,629,840
Income before federal income tax 108,905 (80,098) 247,791 22,468
Total federal income tax expense (benefit) (22,962) 16,779 (51,952) (3,269)
Net income (loss) 85,943 (63,319) 195,839 19,199
Interest expense (13,256) (7,202) (22,829) (14,383)
Corporate expenses (7,556) (9,154) (25,654) (24,652)
Preferred stock dividends (2,300) (2,300) (4,600) (4,600)
Net income (loss) available to common stockholders, basic 83,643 (65,619) 191,239 14,599
Casualty lines        
Revenue from External Customer [Line Items]        
(Favorable)/unfavorable prior year casualty reserve development     50,000 211,000
Total Insurance Operations        
Revenue from External Customer [Line Items]        
Net 823,898 925,548 1,570,223 1,629,840
Dividends to policyholders 1,151 1,054 2,134 4,308
Standard Commercial Lines        
Revenue from External Customer [Line Items]        
Total revenues 943,555 858,707 1,860,625 1,699,951
Net 666,766 747,954 1,248,432 1,303,787
Dividends to policyholders 1,151 1,054 2,134 4,308
Standard Personal Lines        
Revenue from External Customer [Line Items]        
Total revenues 102,954 107,015 207,180 211,502
Net 69,977 101,440 146,646 185,784
E&S Lines        
Revenue from External Customer [Line Items]        
Total revenues 148,096 120,344 291,066 233,358
Net 87,155 76,154 175,145 140,269
Operating Segments        
Revenue from External Customer [Line Items]        
Total revenues 1,326,745 1,196,005 2,611,931 2,360,964
Net catastrophe losses 79,932 90,534 123,289 145,776
Non-catastrophe property loss and loss expense 173,239 185,488 351,935 356,660
Net 823,898 925,548 1,570,223 1,629,840
Commissions to distribution partners 213,697 192,345 423,926 378,955
Salaries and employee benefits 94,970 84,247 190,751 171,725
Other segment expenses 63,312 56,553 128,623 114,633
Total net underwriting expenses incurred 371,979 333,145 743,300 665,313
Dividends to policyholders 1,151 1,054 2,134 4,308
Income before federal income tax 129,717 (63,742) 296,274 61,503
Total federal income tax expense (benefit) (26,914) 13,821 (61,616) (12,042)
Net income (loss) 102,803 (49,921) 234,658 49,461
Operating Segments | Casualty lines        
Revenue from External Customer [Line Items]        
(Favorable)/unfavorable prior year casualty reserve development 45,000 176,000 50,000 211,000
Current year casualty loss costs 525,727 473,526 1,044,999 916,404
Operating Segments | Total Insurance Operations        
Revenue from External Customer [Line Items]        
Total revenues 1,194,605 1,086,066 2,358,871 2,144,811
Net catastrophe losses 79,932 90,534 123,289 145,776
Non-catastrophe property loss and loss expense 173,239 185,488 351,935 356,660
Net 823,898 925,548 1,570,223 1,629,840
Commissions to distribution partners 213,697 192,345 423,926 378,955
Salaries and employee benefits 94,970 84,247 190,751 171,725
Other segment expenses 63,312 56,553 128,623 114,633
Total net underwriting expenses incurred 371,979 333,145 743,300 665,313
Dividends to policyholders 1,151 1,054 2,134 4,308
Income before federal income tax (2,423) (173,681) 43,214 (154,650)
Total federal income tax expense (benefit) 509 36,473 (9,075) 32,476
Net income (loss) (1,914) (137,208) 34,139 (122,174)
Operating Segments | Total Insurance Operations | Casualty lines        
Revenue from External Customer [Line Items]        
(Favorable)/unfavorable prior year casualty reserve development 45,000 176,000 50,000 211,000
Current year casualty loss costs 525,727 473,526 1,044,999 916,404
Operating Segments | Standard Commercial Lines        
Revenue from External Customer [Line Items]        
Total revenues 943,555 858,707 1,860,625 1,699,951
Net catastrophe losses 50,881 50,858 70,692 89,353
Non-catastrophe property loss and loss expense 131,883 124,505 260,675 239,546
Net 666,766 747,954 1,248,432 1,303,787
Commissions to distribution partners 173,406 157,351 343,578 311,321
Salaries and employee benefits 78,667 69,070 158,258 141,344
Other segment expenses 49,709 44,159 101,449 89,691
Total net underwriting expenses incurred 301,782 270,580 603,285 542,356
Dividends to policyholders 1,151 1,054 2,134 4,308
Income before federal income tax (26,144) (160,881) 6,774 (150,500)
Operating Segments | Standard Commercial Lines | Casualty lines        
Revenue from External Customer [Line Items]        
(Favorable)/unfavorable prior year casualty reserve development 45,000 176,000 45,000 211,000
Current year casualty loss costs 439,002 396,591 872,065 763,888
Operating Segments | Standard Personal Lines        
Revenue from External Customer [Line Items]        
Total revenues 102,954 107,015 207,180 211,502
Net catastrophe losses 14,591 25,396 21,704 37,241
Non-catastrophe property loss and loss expense 28,271 45,350 64,759 87,228
Net 69,977 101,440 146,646 185,784
Commissions to distribution partners 6,522 8,124 13,873 15,623
Salaries and employee benefits 8,805 8,644 17,400 18,083
Other segment expenses 9,100 8,108 18,674 16,648
Total net underwriting expenses incurred 24,427 24,876 49,947 50,354
Dividends to policyholders 0 0 0 0
Income before federal income tax 8,550 (19,301) 10,587 (24,636)
Operating Segments | Standard Personal Lines | Casualty lines        
Revenue from External Customer [Line Items]        
(Favorable)/unfavorable prior year casualty reserve development 0 0 5,000 0
Current year casualty loss costs 27,115 30,694 55,183 61,315
Operating Segments | E&S Lines        
Revenue from External Customer [Line Items]        
Total revenues 148,096 120,344 291,066 233,358
Net catastrophe losses 14,460 14,280 30,893 19,182
Non-catastrophe property loss and loss expense 13,085 15,633 26,501 29,886
Net 87,155 76,154 175,145 140,269
Commissions to distribution partners 33,769 26,870 66,475 52,011
Salaries and employee benefits 7,498 6,533 15,093 12,298
Other segment expenses 4,503 4,286 8,500 8,294
Total net underwriting expenses incurred 45,770 37,689 90,068 72,603
Dividends to policyholders 0 0 0 0
Income before federal income tax 15,171 6,501 25,853 20,486
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 59,610 46,241 117,751 91,201
Operating Segments | Investments        
Revenue from External Customer [Line Items]        
Total revenues 132,140 109,939 253,060 216,153
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
Salaries and employee benefits 0 0 0
Other segment expenses 0 0 0
Total net underwriting expenses incurred 0 0 0 0
Dividends to policyholders 0 0 0
Income before federal income tax 132,140 109,939 253,060 216,153
Total federal income tax expense (benefit) (27,423) (22,652) (52,541) (44,518)
Net income (loss) 104,717 87,287 200,519 171,635
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) $ 3,952 $ 2,958 $ 9,664 $ 8,773