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Basis of Presentation (Details Textual) (USD $)
In Millions, unless otherwise specified
1 Months Ended 3 Months Ended 1 Months Ended
Mar. 31, 2013
Revolving Credit Facility Payable [Member]
Jun. 21, 2005
Hallmark Statutory Trust I [Member]
Aug. 23, 2007
Hallmark Statutory Trust II [Member]
Mar. 31, 2013
Subordinated Debt [Member]
Jun. 21, 2005
Subordinated Debt [Member]
Hallmark Statutory Trust I [Member]
Aug. 23, 2007
Subordinated Debt [Member]
Hallmark Statutory Trust II [Member]
Line of Credit Facility, Amount Outstanding $ 1.5          
Trust Preferred Securities, Carrying Value       56.7    
Trust Preferred Securities, Fair Value       49.0    
Current Yield to Maturity, Percentage       8.00%    
Proceeds from Issuance of Trust Preferred Securities   30.0 25.0      
Payments to Acquire Trust Preferred Investments         $ 30.9 $ 25.8