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Reinsurance (Details Textual) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2012
Standard Commercial Segment [Member]
Dec. 31, 2012
Excess and Umbrella Business Unit [Member]
Jun. 30, 2009
Excess and Umbrella Business Unit [Member]
Jun. 01, 2012
E&S Commercial [Member]
Dec. 31, 2012
E&S Commercial [Member]
Prior To June 1, 2012 [Member]
Jun. 01, 2012
E&S Commercial [Member]
Prior To June 1, 2012 [Member]
Dec. 31, 2012
Hallmark County Mutual [Member]
Dec. 31, 2012
Catastrophe [Member]
Dec. 31, 2012
Commercial Property Risk [Member]
Dec. 31, 2011
Commercial Property Risk [Member]
Dec. 31, 2012
Aircraft Hull [Member]
Dec. 31, 2012
Liability Loss [Member]
Dec. 31, 2012
Airport Liability Loss [Member]
Dec. 31, 2012
Workers Compensation Loss [Member]
Dec. 31, 2011
Workers Compensation Loss [Member]
Dec. 31, 2012
Commercial Umbrella and Excess Liability Risks [Member]
Dec. 31, 2011
Commercial Umbrella and Excess Liability Risks [Member]
Dec. 31, 2012
Commercial Liability Risk [Member]
Reinsurance Receivables $ 1.0 $ 0.7                                    
Retention for Reinsurance Losses                   6.0 1.0   1.0 1.0 1.0 1.0       1.0
Reinsurers Reimbursement Percentage 87.50%                 100.00%           100.00%        
Reinsurers Reimbursement Retention Maximum Limit                   25.0                    
Commercial Property Risk Value                   15.0   6.0                
Reinsurers Reimbursement Retention Aggregate Limit                   50.0   30.0         28.0      
Reinsurers Reimbursement Retention for Each Disaster Occurrence                   9.0   5.0 5.5 5.5 4.0   14.0     5.0
Reinsurers Reimbursement Retention for Any One Disaster Occurrence                   6.0   10.0         10.0      
Proportional Reinsurance Cede Risk Percentage     100.00%         60.00%                   10.00%    
Proportional Reinsurance Retention Percentage       20.00%   50.00% 10.00% 40.00% 100.00%                 10.00%    
Proportional Reinsurance Assumed Risk Percentage         35.00%                              
Concentration of Ceded Credit Risk Percentage       80.00%   50.00%                       100.00% 90.00%  
Reinsurance Effect on Claims and Benefits Incurred, Amount Ceded                                   $ 1.0