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Reserve for Loss and Loss Expense (Reserve Loss Development) (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Liability for Claims and Claims Adjustment Expense [Line Items]    
Prior year development $ (5,782) $ (44,010)
Change in Historical Claim Rate Experience [Member]    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Prior year development (5,800) (44,000)
Change in Historical Claim Rate Experience [Member] | Casualty Insurance Product Line [Member]    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Prior year development (16,500) (48,000)
Change in Historical Claim Rate Experience [Member] | Property Insurance [Member]    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Prior year development 10,700 4,000
Change in Historical Claim Rate Experience [Member] | Workers' Compensation Insurance [Member] | Casualty Insurance Product Line [Member]    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Prior year development (24,500) (40,000)
Change in Historical Claim Rate Experience [Member] | E&S Lines | Casualty Insurance Product Line [Member]    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Prior year development (5,000)  
Change in Historical Claim Rate Experience [Member] | Personal Automobile [Member] | Casualty Insurance Product Line [Member]    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Prior year development 9,000  
Change in Historical Claim Rate Experience [Member] | General Liability [Member] | Casualty Insurance Product Line [Member]    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Prior year development   (5,000)
Change in Historical Claim Rate Experience [Member] | Surety Lines | Casualty Insurance Product Line [Member]    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Prior year development   (10,000)
Change in Historical Claim Rate Experience [Member] | Commercial Automobile [Member] | Casualty Insurance Product Line [Member]    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Prior year development $ (4,000) (15,000)
Change in Historical Claim Rate Experience [Member] | Businessowners' Policies [Member] | Casualty Insurance Product Line [Member]    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Prior year development   $ (8,000)