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Debt - Additional Information (Detail)
1 Months Ended 12 Months Ended
Oct. 20, 2015
USD ($)
May. 28, 2015
USD ($)
Jun. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
Loan
May. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Loan
Debt Instrument [Line Items]            
Federal Home Loan Bank advances       $ 40,000,000   $ 35,000,000
Number of FHLB debt advances | Loan       7   6
Repayment on Federal Home Loan Bank advances     $ 5,000,000      
Immediate available credit       $ 40,500,000    
Total line of credit       $ 84,500,000    
Weighted average interest rate       1.17%   0.96%
Federal Home Loan Bank Advances Two            
Debt Instrument [Line Items]            
Federal Home Loan Bank advances         $ 5,000,000  
Advances, Variable rate description       LIBOR-based floating rate    
Federal Home Loan Bank Advances Three            
Debt Instrument [Line Items]            
Federal Home Loan Bank advances       $ 5,000,000    
Advances, Variable rate description       Fixed rate advance    
Federal Home Loan Bank Advances Four            
Debt Instrument [Line Items]            
Federal Home Loan Bank advances     $ 5,000,000 $ 5,000,000    
Advances, Variable rate description       LIBOR-based floating rate advance    
Federal Home Loan Bank Advances Five            
Debt Instrument [Line Items]            
Federal Home Loan Bank advances $ 5,000,000          
Debt instrument, maturity date Oct. 20, 2016          
Current Interest Rate 0.52%          
Federal Home Loan Bank Advances Six            
Debt Instrument [Line Items]            
Federal Home Loan Bank advances       $ 5,000,000    
Federal Home Loan Bank Advances Seven            
Debt Instrument [Line Items]            
Federal Home Loan Bank advances       $ 5,000,000    
Subordinated Debt Due May 2025            
Debt Instrument [Line Items]            
Debt instrument, maturity date   May 28, 2025        
Current Interest Rate   6.50%   6.50%    
Debt instrument, face amount   $ 7,000,000   $ 7,000,000    
Debt instrument, frequency of payment   1st of March and September of each year, commencing September 1, 2015