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Long Term Debt - Advances of FHLB (Detail) - USD ($)
6 Months Ended
Jun. 30, 2015
Dec. 31, 2014
[1]
May. 31, 2014
Debt Instrument [Line Items]      
Federal Home Loan Bank advances $ 30,000,000 $ 35,000,000  
Federal Home Loan Bank Advances Two      
Debt Instrument [Line Items]      
Federal Home Loan Bank advances     $ 5,000,000
Federal Home Loan Bank Advances Three      
Debt Instrument [Line Items]      
Federal Home Loan Bank advances 5,000,000    
Federal Home Loan Bank Advances Four      
Debt Instrument [Line Items]      
Federal Home Loan Bank advances 5,000,000    
Federal Home Loan Bank Advances Five      
Debt Instrument [Line Items]      
Federal Home Loan Bank advances 5,000,000    
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 2.6559%    
Maturity Date Apr. 13, 2020    
Adjustable Rate Credit | Federal Home Loan Bank Advances Five      
Debt Instrument [Line Items]      
Federal Home Loan Bank advances $ 5,000,000    
Originated Jun. 18, 2015    
Current Interest Rate 0.3008%    
Maturity Date Sep. 19, 2016    
Fixed Rate Credit | Federal Home Loan Bank Advances Two      
Debt Instrument [Line Items]      
Federal Home Loan Bank advances $ 5,000,000    
Originated Oct. 20, 2014    
Current Interest Rate 0.47%    
Maturity Date Apr. 20, 2016    
Fixed Rate Credit | Federal Home Loan Bank Advances Three      
Debt Instrument [Line Items]      
Federal Home Loan Bank advances $ 5,000,000    
Originated Oct. 20, 2014    
Current Interest Rate 0.30%    
Maturity Date Oct. 20, 2015    
Fixed Rate Credit | Federal Home Loan Bank Advances Four      
Debt Instrument [Line Items]      
Federal Home Loan Bank advances $ 5,000,000    
Originated May 20, 2015    
Current Interest Rate 0.37%    
Maturity Date Feb. 22, 2016    
[1] Derived from the audited consolidated financial statements.