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Federal Home Loan Bank Advances - Additional Information (Details) - USD ($)
6 Months Ended 12 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Dec. 31, 2012
Securities Pledged As Collateral [Line Items]        
Long-term Federal Home Loan Bank Advances $ 47,027,000   $ 54,321,000  
Maximum borrowing capacity of the Bank 71,389,000      
Cash management line of credit 40,000,000      
Cash Management Line Of Credit Outstanding 0   0  
Prepayments For Federal Home Loan Bank Advances     $ 27,500,000  
Federal Home Loan Bank advances, Activity for Year, average interest rate     2.47%  
Federal Home Loan Bank advances, contractual average interest rate     0.88%  
Deferred FHLB prepayment penalty 106,000 $ 105,000   $ 1,017,000
Minimum [Member]        
Securities Pledged As Collateral [Line Items]        
Federal Home Loan Bank advances, remaining maturity     12 months  
Federal Home Loan Bank advances, fixed rate, remaining maturity     49 months  
Maximum [Member]        
Securities Pledged As Collateral [Line Items]        
Federal Home Loan Bank advances, remaining maturity     31 months  
Federal Home Loan Bank advances, fixed rate, remaining maturity     67 months  
Multi-family mortgage loans [Member]        
Securities Pledged As Collateral [Line Items]        
Investment securities 98,714,000      
Residential real estate mortgage loans [Member]        
Securities Pledged As Collateral [Line Items]        
Investment securities $ 5,040,000