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Deposits - Composition of Deposits (Detail) - USD ($)
Dec. 31, 2015
Dec. 31, 2014
Banking and Thrift [Abstract]    
Non-interest bearing $ 148,724,257 $ 145,729,932
NOW and money market accounts 323,381,170 268,567,815
Savings deposits 70,534,886 60,253,788
Time deposits, $100,000 or more 116,023,999 121,360,214
Other time deposits 94,740,476 100,182,145
Total deposits $ 753,404,788 $ 696,093,894