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Summary of Significant Accounting Policies (Details Textual) (USD $)
 1 Months Ended 3 Months Ended 12 Months Ended
Aug. 31, 2012
May 31, 2012
Dec. 31, 2011
Apr. 30, 2004
Dec. 31, 2003
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Jul. 31, 2011
Dec. 31, 2009
Summary of significant accounting policies (Textual) [Abstract]                                    
Assets and revenues                           99.00% 99.00% 99.00%    
Decrease in estimated liability                   $ 15,200,000                
Decrease in premium tax receivable                   7,500,000                
Change in estimated guaranty fund liability                     2,800,000              
Comprehensive income           8,091,000 8,570,000 3,948,000 9,508,000 8,046,000 6,162,000 5,386,000 6,537,000 30,117,000 26,131,000 32,057,000    
Decrease in retained earnings                                   1,385,000
Original maturity of cash equivalent                           3 months        
As adjusted to deferred policy acquisition costs     16,578,000     18,419,000       16,578,000       18,419,000 16,578,000      
Experience rated commission and other operating costs                           11,100,000 5,700,000 9,500,000    
Advertising expenses                           444,000 421,000 413,000    
Premium tax benefit                           3,400,000 3,300,000      
Assessment Related premium Payment period                           1 year        
Assessment Related loss Payment period                           1 year        
Proceeds from issuance of trust preferred securities       25,000,000 10,000,000                          
Purchase of subordinated debt securities       25,800,000 10,300,000                       10,300,000  
Redemption of debt securities 12,900,000 12,900,000                                
Reduction of deferred policy acquisition costs     2,200,000                              
Decrease in deferred income tax liabilities     800,000             800,000         800,000      
Decrease to shareholders' equity     1,400,000             1,400,000         1,400,000      
Reduction in book value per share     $ 0.08             $ 0.08         $ 0.08      
As adjusted
                                    
Summary of significant accounting policies (Textual) [Abstract]                                    
Comprehensive income                             26,131,000 32,057,000    
As adjusted to deferred policy acquisition costs     (2,178,000)             (2,178,000)         (2,178,000)      
As Reported [Member]
                                    
Summary of significant accounting policies (Textual) [Abstract]                                    
Comprehensive income                   8,031,000 6,149,000 5,360,000 6,535,000   26,075,000 32,143,000    
As adjusted to deferred policy acquisition costs     $ 18,756,000             $ 18,756,000         $ 18,756,000      
Maximum [Member]
                                    
Summary of significant accounting policies (Textual) [Abstract]                                    
Short-term investments maturity period                           1 year        
Minimum [Member]
                                    
Summary of significant accounting policies (Textual) [Abstract]                                    
Short-term investments maturity period                           3 months        
Other Assets [Member] | Maximum [Member]
                                    
Summary of significant accounting policies (Textual) [Abstract]                                    
Estimated useful life of assets                           7 years        
Other Assets [Member] | Minimum [Member]
                                    
Summary of significant accounting policies (Textual) [Abstract]                                    
Estimated useful life of assets                           3 years        
Land and office building [Member]
                                    
Summary of significant accounting policies (Textual) [Abstract]                                    
Estimated useful life of assets                           39 years