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Investment Securities (Details 2) (USD $)
Jun. 30, 2012
Dec. 31, 2011
Contractual maturity of amortized cost and fair value of debt securities    
Amortized cost, Due in one year or less $ 1,938,269  
Amortized cost, Due after one year through five years 80,295,955  
Amortized cost, Due after five years through ten years 22,326,908  
Amortized cost, Due after ten years 750,792  
Amortized cost, Maturity period 105,311,924  
Amortized cost, Asset-backed securities 117,286,545  
Amortized cost, Total 222,598,469  
Fair value, Due in one year or less 1,957,432  
Fair value, Due after one year through five years 81,442,563  
Fair value, Due after five years through ten years 23,169,861  
Fair value, Due after ten years 810,588  
Fair value, Maturity period 107,380,444  
Fair value, Asset-backed securities 120,889,297  
Fair value, Total $ 228,269,741 $ 213,806,001