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Reinsurance (Details Textual) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Reinsurance and Insurance Operations (Textual) [Abstract]    
Covering certain loss occurrences including hurricanes $ 2,700,000  
Reinsurance and Insurance Operations (Additional Textual) [Abstract]    
In-force policyholder coverage for windstorm exposures 127,000,000,000  
Percentage of premium ceded 45.00% 50.00%
Percentage reduction of premium ceded 5.00%  
Maximum catastrophic event pre-tax liability retained T25 arrangement 91,500,000  
Maximum catastrophic event losses T25 arrangement 1,733,000,000  
Aggregate premium installment payments T25 arrangement 72,981,000  
Option One [Member]
    
Reinsurance and Insurance Operations (Textual) [Abstract]    
Covering certain loss occurrences including hurricanes 75,000,000  
Option One [Member] | Minimum [Member]
    
Reinsurance and Insurance Operations (Textual) [Abstract]    
UPCIC obtained catastrophe covering certain loss occurrences including hurricanes excess 45.00%  
Covering certain loss occurrences including hurricanes 75,000,000  
Option Two [Member]
    
Reinsurance and Insurance Operations (Textual) [Abstract]    
Covering certain loss occurrences including hurricanes 105,000,000  
Option Two [Member] | Minimum [Member]
    
Reinsurance and Insurance Operations (Textual) [Abstract]    
Covering certain loss occurrences including hurricanes $ 45,000,000  
Option Two [Member] | Maximum [Member]
    
Reinsurance and Insurance Operations (Textual) [Abstract]    
UPCIC obtained catastrophe covering certain loss occurrences including hurricanes excess 55.00%