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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
Mar. 31, 2025
Mar. 31, 2024
Revenue from External Customer [Line Items]    
Total revenues $ 1,285,186 $ 1,164,959
(Favorable)/unfavorable prior year casualty reserve development (13,667) 15,773
Current year casualty loss costs 759,992 688,519
Net 746,325 704,292
Income before federal income tax 138,886 102,566
Total federal income tax expense (benefit) (28,990) (20,048)
Net income (loss) 109,896 82,518
Interest expense (9,573) (7,181)
Corporate expenses (18,098) (15,498)
Preferred stock dividends (2,300) (2,300)
Net income (loss) available to common stockholders, basic 107,596 80,218
Casualty lines    
Revenue from External Customer [Line Items]    
(Favorable)/unfavorable prior year casualty reserve development 5,000 35,000
Total Insurance Operations    
Revenue from External Customer [Line Items]    
Net 746,325 704,292
Dividends to policyholders 983 3,254
Standard Commercial Lines    
Revenue from External Customer [Line Items]    
Total revenues 917,070 841,244
Net 581,666 555,833
Dividends to policyholders 983 3,254
Standard Personal Lines    
Revenue from External Customer [Line Items]    
Total revenues 104,227 104,486
Net 76,669 84,344
E&S Lines    
Revenue from External Customer [Line Items]    
Total revenues 142,969 113,015
Net 87,990 64,115
Operating Segments    
Revenue from External Customer [Line Items]    
Total revenues 1,285,186 1,164,959
Net catastrophe losses 43,357 55,242
Non-catastrophe property loss and loss expense 178,696 171,172
Net 746,325 704,292
Commissions to distribution partners 210,228 186,609
Salaries and employee benefits 95,781 87,479
Other segment expenses 65,312 58,080
Total net underwriting expenses incurred 371,321 332,168
Dividends to policyholders 983 3,254
Income before federal income tax 166,557 125,245
Total federal income tax expense (benefit) (34,702) (25,863)
Net income (loss) 131,855 99,382
Operating Segments | Casualty lines    
Revenue from External Customer [Line Items]    
(Favorable)/unfavorable prior year casualty reserve development 5,000 35,000
Current year casualty loss costs 519,272 442,878
Operating Segments | Total Insurance Operations    
Revenue from External Customer [Line Items]    
Total revenues 1,164,266 1,058,745
Net catastrophe losses 43,357 55,242
Non-catastrophe property loss and loss expense 178,696 171,172
Net 746,325 704,292
Commissions to distribution partners 210,228 186,609
Salaries and employee benefits 95,781 87,479
Other segment expenses 65,312 58,080
Total net underwriting expenses incurred 371,321 332,168
Dividends to policyholders 983 3,254
Income before federal income tax 45,637 19,031
Total federal income tax expense (benefit) (9,584) (3,997)
Net income (loss) 36,053 15,034
Operating Segments | Total Insurance Operations | Casualty lines    
Revenue from External Customer [Line Items]    
(Favorable)/unfavorable prior year casualty reserve development 5,000 35,000
Current year casualty loss costs 519,272 442,878
Operating Segments | Standard Commercial Lines    
Revenue from External Customer [Line Items]    
Total revenues 917,070 841,244
Net catastrophe losses 19,811 38,495
Non-catastrophe property loss and loss expense 128,791 115,041
Net 581,666 555,833
Commissions to distribution partners 170,170 153,970
Salaries and employee benefits 79,591 72,274
Other segment expenses 51,742 45,532
Total net underwriting expenses incurred 301,503 271,776
Dividends to policyholders 983 3,254
Income before federal income tax 32,918 10,381
Operating Segments | Standard Commercial Lines | Casualty lines    
Revenue from External Customer [Line Items]    
(Favorable)/unfavorable prior year casualty reserve development 0 35,000
Current year casualty loss costs 433,064 367,297
Operating Segments | Standard Personal Lines    
Revenue from External Customer [Line Items]    
Total revenues 104,227 104,486
Net catastrophe losses 7,113 11,845
Non-catastrophe property loss and loss expense 36,489 41,878
Net 76,669 84,344
Commissions to distribution partners 7,351 7,498
Salaries and employee benefits 8,595 9,439
Other segment expenses 9,575 8,540
Total net underwriting expenses incurred 25,521 25,477
Dividends to policyholders 0 0
Income before federal income tax 2,037 (5,335)
Operating Segments | Standard Personal Lines | Casualty lines    
Revenue from External Customer [Line Items]    
(Favorable)/unfavorable prior year casualty reserve development 5,000 0
Current year casualty loss costs 28,067 30,621
Operating Segments | E&S Lines    
Revenue from External Customer [Line Items]    
Total revenues 142,969 113,015
Net catastrophe losses 16,433 4,902
Non-catastrophe property loss and loss expense 13,416 14,253
Net 87,990 64,115
Commissions to distribution partners 32,707 25,141
Salaries and employee benefits 7,595 5,766
Other segment expenses 3,995 4,008
Total net underwriting expenses incurred 44,297 34,915
Dividends to policyholders 0 0
Income before federal income tax 10,682 13,985
Operating Segments | E&S Lines | Casualty lines    
Revenue from External Customer [Line Items]    
(Favorable)/unfavorable prior year casualty reserve development 0 0
Current year casualty loss costs 58,141 44,960
Operating Segments | Investments    
Revenue from External Customer [Line Items]    
Total revenues 120,920 106,214
Net catastrophe losses 0 0
Non-catastrophe property loss and loss expense 0 0
Net 0 0
Commissions to distribution partners 0 0
Salaries and employee benefits 0 0
Other segment expenses 0 0
Total net underwriting expenses incurred 0 0
Dividends to policyholders 0 0
Income before federal income tax 120,920 106,214
Total federal income tax expense (benefit) (25,118) (21,866)
Net income (loss) 95,802 84,348
Operating Segments | Investments | Casualty lines    
Revenue from External Customer [Line Items]    
(Favorable)/unfavorable prior year casualty reserve development 0 0
Current year casualty loss costs 0 0
Other    
Revenue from External Customer [Line Items]    
Total federal income tax expense (benefit) $ 5,712 $ 5,815