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Subordinated Debt Securities (Summary of the Nature and Terms of the Junior Subordinated Debt and Trust) (Details) - Junior subordinated debt
shares in Thousands, $ in Thousands
12 Months Ended
Aug. 23, 2007
USD ($)
shares
Jun. 21, 2005
USD ($)
shares
Dec. 31, 2020
item
Subordinated Borrowing [Line Items]      
Debt Instrument Covenant, Debt To Capital Ratio     35.00%
Interest Payment Extension Period Elected | item     20
Hallmark Statutory Trust I [Member]      
Subordinated Borrowing [Line Items]      
Issue date   Jun. 21, 2005  
Principal amount of trust preferred securities   $ 30,000  
Principal amount of junior subordinated debt securities   $ 30,928  
Maturity date of junior subordinated debt securities   Jun. 15, 2035  
Trust common stock | shares   928  
Interest rate, per annum   Three Month LIBOR + 3.25%  
Current interest rate     3.47%
Hallmark Statutory Trust I [Member] | London Interbank Offered Rate (LIBOR) [Member]      
Subordinated Borrowing [Line Items]      
Debt instrument, basis spread on variable rate   3.25%  
Hallmark Statutory Trust II [Member]      
Subordinated Borrowing [Line Items]      
Issue date Aug. 23, 2007    
Principal amount of trust preferred securities $ 25,000    
Principal amount of junior subordinated debt securities $ 25,774    
Maturity date of junior subordinated debt securities Sep. 15, 2037    
Trust common stock | shares 774    
Interest rate, per annum Three Month LIBOR + 2.90%    
Current interest rate     3.12%
Hallmark Statutory Trust II [Member] | London Interbank Offered Rate (LIBOR) [Member]      
Subordinated Borrowing [Line Items]      
Debt instrument, basis spread on variable rate 2.90%