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Loans - Additional Information (Detail) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Financing Receivable, Recorded Investment [Line Items]          
Percentage of loan portfolio to earning assets     72.80%   69.90%
Loan to value ratio 80.00%   80.00%    
Troubled debt restructurings, balance $ 6,800,000   $ 6,800,000   $ 6,800,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 3,133,976   3,133,976   $ 3,480,190
Foreclosed Real Estate Expense     1,500,000    
Financing Receivable [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Non- Accrual 123,000 $ 1,000 322,000 $ 98,000  
Residential Real Estate [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Mortgage Loans on Real Estate, Commercial and Consumer, Net, Total $ 100,000   $ 100,000