v3.22.2.2
Basis of Presentation (Narrative) (Details)
$ in Thousands
Oct. 07, 2022
USD ($)
item
employee
Aug. 23, 2007
USD ($)
Jun. 21, 2005
USD ($)
Sep. 30, 2022
USD ($)
Dec. 31, 2021
USD ($)
Variable Interest Entity [Line Items]          
Senior unsecured notes due 2029, carrying value       $ 49,328 $ 49,254
Valuation allowance       30,400  
Hallmark Statutory Trust I [Member]          
Variable Interest Entity [Line Items]          
Proceeds from issuance of trust preferred securities     $ 30,000    
Hallmark Statutory Trust I I [Member]          
Variable Interest Entity [Line Items]          
Proceeds from issuance of trust preferred securities   $ 25,000      
Senior unsecured notes due 2029 [Member]          
Variable Interest Entity [Line Items]          
Senior unsecured notes due 2029, carrying value       49,300  
Senior unsecured notes due 2029, fair value       43,200  
Subordinated Debt [Member]          
Variable Interest Entity [Line Items]          
Trust preferred securities, carrying value       56,000  
Trust preferred securities, fair value       $ 35,600  
Subordinated Debt [Member] | Hallmark Statutory Trust I [Member]          
Variable Interest Entity [Line Items]          
Payments to acquire trust preferred investments     $ 30,900    
Subordinated Debt [Member] | Hallmark Statutory Trust I I [Member]          
Variable Interest Entity [Line Items]          
Payments to acquire trust preferred investments   $ 25,800      
Discontinued Operations, Held-for-sale or disposed of by sale | E&S [Member] | Subsequent Event [Member]          
Variable Interest Entity [Line Items]          
Cash consideration $ 40,000        
Acquisition costs $ 19,200        
Number of business units | item 9        
Number of employees | employee 200