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Basis of Presentation (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
9 Months Ended 0 Months Ended 9 Months Ended 0 Months Ended
Sep. 30, 2013
Sep. 30, 2013
Revolving Credit Facility Payable [Member]
Jun. 21, 2005
Hallmark Statutory Trust I [Member]
Aug. 23, 2007
Hallmark Statutory Trust II [Member]
Sep. 30, 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]
Variable Interest Entity [Line Items]              
Line of credit facility, amount outstanding   $ 1.5          
Trust preferred securities, carrying value         56.7    
Trust preferred securities, fair value         51.9    
Current yield to maturity percentage 9.80%       8.00%    
Proceeds from issuance of trust preferred securities     30.0 25.0      
Payments to acquire trust preferred investments           $ 30.9 $ 25.8