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Financial Instruments with Off-Balance-Sheet Risk - Additional Information (Detail) - USD ($)
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Financial Instruments With Off Balance Sheet Risk [Abstract]      
Outstanding irrevocable letters of credit $ 1,919,678 $ 1,879,678 $ 3,059,011
Unused loan commitments amount outstanding 41,935,725 66,663,320 68,171,024
Fixed rate commitments amount outstanding $ 30,601,000 $ 35,753,000 $ 38,324,000