Financial Instruments with Off-Balance-Sheet Risk - Additional Information (Detail) - USD ($) |
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
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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 |