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Subordinated Debt Securities (Narrative) (Details) - USD ($)
$ in Millions
6 Months Ended
Aug. 23, 2007
Jun. 21, 2005
Jun. 30, 2019
Hallmark Statutory Trust I [Member] | Subordinated Debt Due In 2035 [Member]      
Subordinated Borrowing [Line Items]      
Long-term debt, gross   $ 30.9 $ 30.9
Proceeds from issuance of trust preferred securities   30.0  
Proceeds from issuance of common stock   $ 0.9  
Subordinated borrowing, interest rate   7.725% 5.66%
Debt instrument, interest rate fixed to floating date   Jun. 15, 2015  
Debt instrument, maturity date   Jun. 15, 2015  
Debt instrument, description of variable rate basis     interest adjusts quarterly to the three-month LIBOR rate plus 3.25 percentage points
Hallmark Statutory Trust II [Member] | Subordinated Debt Due In 2037 [Member]      
Subordinated Borrowing [Line Items]      
Long-term debt, gross $ 25.8   $ 25.8
Proceeds from issuance of trust preferred securities 25.0    
Proceeds from issuance of common stock $ 0.8    
Subordinated borrowing, interest rate 8.28%   5.31%
Debt instrument, interest rate fixed to floating date Sep. 15, 2017    
Debt instrument, maturity date Sep. 15, 2017    
Debt instrument, description of variable rate basis     three-month LIBOR rate plus 2.90 percentage points
London Interbank Offered Rate (LIBOR) [Member] | Hallmark Statutory Trust I [Member] | Subordinated Debt Due In 2035 [Member]      
Subordinated Borrowing [Line Items]      
Debt instrument, basis spread on variable rate     3.25%
London Interbank Offered Rate (LIBOR) [Member] | Hallmark Statutory Trust II [Member] | Subordinated Debt Due In 2037 [Member]      
Subordinated Borrowing [Line Items]      
Subordinated borrowing, interest rate     2.90%