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Reserve for Loss and Loss Expense (Reserve Loss Development) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Liability for Claims and Claims Adjustment Expense [Line Items]    
Prior year development $ (12,970) $ (14,063)
Change in Historical Claim Rate Experience [Member]    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Prior year development (13,000) (14,100)
Change in Historical Claim Rate Experience [Member] | Casualty Insurance Product Line [Member]    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Prior year development   (20,000)
Change in Historical Claim Rate Experience [Member] | Property Insurance [Member]    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Prior year development   5,900
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 (10,000) (10,000)
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 $ 2,000  
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   $ (5,000)