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Other Income and Other Expense - Major Income Classifications Included in Other Income Under Non Interest Income on Income Statement (Detail) - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Component Of Other Expense Income Nonoperating [Line Items]      
Other income $ 2,159,407 $ 2,118,435 $ 1,554,454
BOLI Insurance      
Component Of Other Expense Income Nonoperating [Line Items]      
Other income 568,000 562,732 657,273
Mortgage loan origination fees      
Component Of Other Expense Income Nonoperating [Line Items]      
Other income 362,611 342,765 367,573
Other income      
Component Of Other Expense Income Nonoperating [Line Items]      
Other income $ 1,228,546 $ 1,212,938 $ 529,608