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Long Term Debt - Advances of Debt (Detail) - USD ($)
9 Months Ended
Sep. 30, 2016
Dec. 31, 2015
[1]
Debt Instrument [Line Items]    
Federal Home Loan Bank advances $ 25,000,000 $ 40,000,000
Federal Home Loan Bank Advances Three    
Debt Instrument [Line Items]    
Federal Home Loan Bank advances $ 5,000,000  
Current Interest Rate 0.49%  
Adjustable Rate Hybrid | Federal Home Loan Bank Advances One    
Debt Instrument [Line Items]    
Federal Home Loan Bank advances $ 10,000,000  
Originated Apr. 12, 2013  
Current Interest Rate 3.0491%  
Maturity Date Apr. 13, 2020  
Fixed Rate Credit | Federal Home Loan Bank Advances Two    
Debt Instrument [Line Items]    
Federal Home Loan Bank advances $ 5,000,000  
Originated Oct. 20, 2015  
Current Interest Rate 0.52%  
Maturity Date Oct. 20, 2016  
Fixed Rate Credit | Federal Home Loan Bank Advances Three    
Debt Instrument [Line Items]    
Federal Home Loan Bank advances $ 5,000,000  
Originated Dec. 21, 2015  
Current Interest Rate 0.99%  
Maturity Date Jun. 15, 2017  
Fixed Rate Credit | Federal Home Loan Bank Advances Four    
Debt Instrument [Line Items]    
Federal Home Loan Bank advances $ 5,000,000  
Originated Dec. 22, 2015  
Current Interest Rate 1.08%  
Maturity Date Sep. 15, 2017  
[1] Derived from Audited December 31, 2015 Financial Statements