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Long Term Debt - Additional Information (Detail)
Jun. 30, 2015
USD ($)
Loan
May. 28, 2015
USD ($)
Dec. 31, 2014
USD ($)
May. 31, 2014
USD ($)
Debt Instrument [Line Items]        
Number of FHLB debt advances | Loan 5      
Federal Home Loan Bank advances $ 30,000,000   $ 35,000,000 [1]  
Number of repaid FHLB debt advances | Loan 1      
Immediate available credit $ 44,200,000      
Total line of credit $ 78,200,000      
Weighted average interest rate 1.13%   0.96%  
Subordinated Debt Due May Twenty Twenty Five        
Debt Instrument [Line Items]        
Debt instrument, face amount $ 7,000,000 $ 7,000,000    
Debt instrument, coupon percentage 6.50% 6.50%    
Debt instrument, maturity date   May 28, 2025    
Debt instrument, frequency of payment   1st of March and September of each year, commencing September 1, 2015    
Federal Home Loan Bank Advances Two        
Debt Instrument [Line Items]        
Federal Home Loan Bank advances       $ 5,000,000
Interest rate LIBOR-based floating rate advance       2.69%
Federal Home Loan Bank Advances Three        
Debt Instrument [Line Items]        
Federal Home Loan Bank advances $ 5,000,000      
Advances, Variable rate description Three month LIBOR-based floating rate advance      
Federal Home Loan Bank Advances Four        
Debt Instrument [Line Items]        
Federal Home Loan Bank advances $ 5,000,000      
Advances, Variable rate description Fixed rate advances      
Federal Home Loan Bank Advances Five        
Debt Instrument [Line Items]        
Federal Home Loan Bank advances $ 5,000,000      
Advances, Variable rate description Fixed rate advances      
Federal Home Loan Bank Advances Six        
Debt Instrument [Line Items]        
Federal Home Loan Bank advances $ 5,000,000      
Advances, Variable rate description Fixed rate advances      
Federal Home Loan Bank Advances Seven        
Debt Instrument [Line Items]        
Federal Home Loan Bank advances $ 5,000,000      
Advances, Variable rate description Fixed rate advances      
[1] Derived from the audited consolidated financial statements.