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Reserve for Loss and Loss Expense (Reserve Loss Development) (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Liability for Claims and Claims Adjustment Expense [Line Items]    
Prior year development $ (8,067) $ (22,674)
Change in Historical Claim Rate Experience [Member]    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Prior year development (8,100) (22,700)
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) (32,000)
Change in Historical Claim Rate Experience [Member] | Property Insurance [Member]    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Prior year development 8,400 9,300
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 (17,500) (20,000)
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 $ 6,000  
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   $ (7,000)