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Reserve for Loss and Loss Expense - Schedule of (Favorable)/ Unfavorable Prior Year Development (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Incurred loss and loss expense for claims occurring in the prior year $ 285,271 $ 9,954 $ (78,890)
Favorable or Unfavorable Loss Development      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Incurred loss and loss expense for claims occurring in the prior year 285,300 10,000 (78,900)
General liability | Favorable or Unfavorable Loss Development      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Incurred loss and loss expense for claims occurring in the prior year 316,000 55,000 (5,000)
Commercial automobile | Favorable or Unfavorable Loss Development      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Incurred loss and loss expense for claims occurring in the prior year 19,500 8,000 22,500
Workers Compensation | Favorable or Unfavorable Loss Development      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Incurred loss and loss expense for claims occurring in the prior year (45,000) (74,500) (70,000)
Businessowners’ policies | Favorable or Unfavorable Loss Development      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Incurred loss and loss expense for claims occurring in the prior year (1,700) 7,600 (7,300)
Commercial Property | Favorable or Unfavorable Loss Development      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Incurred loss and loss expense for claims occurring in the prior year (23,400) 700 (1,600)
Bonds | Favorable or Unfavorable Loss Development      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Incurred loss and loss expense for claims occurring in the prior year (5,000) 0 (10,000)
Homeowners | Favorable or Unfavorable Loss Development      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Incurred loss and loss expense for claims occurring in the prior year (1,400) 4,600 (600)
Personal automobile | Favorable or Unfavorable Loss Development      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Incurred loss and loss expense for claims occurring in the prior year 11,100 15,300 500
E&S Casualty Lines | Favorable or Unfavorable Loss Development      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Incurred loss and loss expense for claims occurring in the prior year 20,000 (5,000) (5,000)
E&S Property Lines | Favorable or Unfavorable Loss Development      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Incurred loss and loss expense for claims occurring in the prior year (4,900) (1,600) (2,500)
Other | Favorable or Unfavorable Loss Development      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Incurred loss and loss expense for claims occurring in the prior year $ 100 $ (100) $ 100