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Reserve for Loss and Loss Expense - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 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 $ (13,667) $ 15,773
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 5,000 35,000
Casualty reserve | Standard Commercial Lines | General liability    
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   50,000
Casualty reserve | Standard Commercial Lines | Workers' compensation    
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   (15,000)
Casualty reserve | Standard Personal Lines | Personal automobile    
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 5,000
Casualty reserve | Standard Personal Lines | Homeowners    
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)
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 $ (18,700) $ (19,200)