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Available-for-Sale Securities - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2013
Security
Dec. 31, 2012
Security
Dec. 31, 2011
Security
Schedule of Available-for-sale Securities [Line Items]      
Number of securities having unrealized holding losses with aggregate depreciation 11 9  
Unrealized holding losses depreciation 3.20% 1.90%  
Repurchase agreements   $ 7,000,000  
Gross proceeds from the sales 0 45,226,033 26,349,070
Gross gains   910,591 1,109,305
Gross losses   9,651  
Number of sales of available-for-sale securities     10
Municipal Deposits Securities [Member]
      
Schedule of Available-for-sale Securities [Line Items]      
Carrying value of available-for-sale securities pledged to secure obligations under municipal deposits 5,758,916 6,913,797  
Repurchase agreements $ 0 $ 9,088,000