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Basis of Presentation (Narrative) (Details)
$ in Thousands
9 Months Ended
Jan. 01, 2018
USD ($)
Aug. 23, 2007
USD ($)
Jun. 21, 2005
USD ($)
Sep. 30, 2019
USD ($)
Dec. 31, 2017
USD ($)
Variable Interest Entity [Line Items]          
Equity Securities, FV-NI, Unrealized Gain $ 17,000        
Senior unsecured notes due 2029       $ 49,034  
Reclassification out of AOCI as a result of Tax Act $ (2,600)        
Right-of-use assets       16,578  
Lease liabilities       17,485  
Accumulated Other Comprehensive Income (Loss) [Member]          
Variable Interest Entity [Line Items]          
Reclassification out of AOCI as a result of Tax Act         $ 2,619
Retained Earnings [Member]          
Variable Interest Entity [Line Items]          
Reclassification out of AOCI as a result of Tax Act         (2,619)
Accounting Standards Update 2016-01 [Member] | Accumulated Other Comprehensive Income (Loss) [Member]          
Variable Interest Entity [Line Items]          
Cumulative effect of new accounting principle in period of adoption         (16,993)
Accounting Standards Update 2016-01 [Member] | Retained Earnings [Member]          
Variable Interest Entity [Line Items]          
Cumulative effect of new accounting principle in period of adoption         $ 16,993
Hallmark Statutory Trust I [Member]          
Variable Interest Entity [Line Items]          
Proceeds from issuance of trust preferred securities     $ 30,000    
Hallmark Statutory Trust II [Member]          
Variable Interest Entity [Line Items]          
Proceeds from issuance of trust preferred securities   $ 25,000      
Senior Notes [Member]          
Variable Interest Entity [Line Items]          
Notes Payable, Fair Value Disclosure       $ 49,100  
Senior Notes [Member] | Minimum [Member] | Measurement Input, Discount Rate [Member]          
Variable Interest Entity [Line Items]          
Debt Instrument, Measurement Input       6.2  
Senior Notes [Member] | Maximum [Member] | Measurement Input, Discount Rate [Member]          
Variable Interest Entity [Line Items]          
Debt Instrument, Measurement Input       6.8  
Subordinated Debt [Member]          
Variable Interest Entity [Line Items]          
Trust preferred securities, carrying value       $ 55,800  
Trust preferred securities, fair value       $ 39,700  
Current yield to maturity percentage       8.00%  
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 II [Member]          
Variable Interest Entity [Line Items]          
Payments to acquire trust preferred investments   $ 25,800