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Reserve for Loss and Loss Expense - Narrative (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
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 $ 70,096 $ 182,748
Casualty reserve    
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 90,000 211,000
Property lines    
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 (19,900) (28,300)
Commercial automobile | Casualty reserve | Standard Commercial Lines    
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 60,000 20,000
General liability | Casualty reserve | Standard Commercial Lines    
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 20,000 216,000
Personal automobile | Casualty reserve | Standard Personal Lines    
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 $ 10,000 5,000
Workers compensation | Casualty reserve | Standard Commercial Lines    
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)
Bonds | Casualty reserve | Standard Commercial Lines    
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)
Homeowners | Casualty reserve | Standard Personal Lines    
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)