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Fair Value of Financial Instruments - Additional Information (Detail) - USD ($)
9 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Carrying value of an impaired loan $ 12,495,636 $ 10,243,082
Impaired loans, allowance for loan losses 2,792,962 2,024,754
Other Real Estate Owned [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Other real estate owned 681,314 2,874,173
Other real estate owned ("OREO") acquired and sold during period 252,262  
Additional write downs on OREO previously acquired $ 0  
Real Estate Investment Property, at Cost   $ 694,207