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Basis of Presentation (Narrative) (Details) - USD ($)
$ in Thousands
6 Months Ended
Jan. 01, 2018
Aug. 23, 2007
Jun. 21, 2005
Jun. 30, 2019
Dec. 31, 2017
Variable Interest Entity [Line Items]          
Equity Securities, FV-NI, Unrealized Gain $ 17,000        
Reclassification out of AOCI as a result of Tax Act $ (2,600)        
Right-of-use assets       $ 17,109  
Lease liabilities       17,619  
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
Revolving Credit Facility B [Member]          
Variable Interest Entity [Line Items]          
Credit facility, amount outstanding       30,000  
Credit facility, fair value       30,200  
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      
Subordinated Debt [Member]          
Variable Interest Entity [Line Items]          
Trust preferred securities, carrying value       55,800  
Trust preferred securities, fair value       $ 42,600  
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