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Loans - Major classifications of loans (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total loans $ 272,016   $ 263,973      
Net deferred loan origination costs (29)   (1)      
Less: Allowance for loan losses (1,411) $ (1,336) (1,261) $ (1,102) $ (1,042) $ (990)
Loans receivable, net 270,576   262,711      
Real estate loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total loans 267,701   260,224      
Real estate loans | Secured by one-to-four family residences            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total loans 217,157   206,894      
Less: Allowance for loan losses (803) (742) (816) (690) (661) (584)
Real estate loans | Secured by multi-family residences            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total loans 10,440   10,650      
Less: Allowance for loan losses (78) (79) (80) (47) (45) (38)
Real estate loans | Construction            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total loans 6,530   10,750      
Less: Allowance for loan losses (33) (42) (54) (49) (31) (31)
Real estate loans | Commercial real estate            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total loans 17,046   14,803      
Less: Allowance for loan losses (211) (205) (148) (106) (107) (84)
Real estate loans | Home equity lines of credit            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total loans 16,528   17,127      
Less: Allowance for loan losses (103) (105) (107) (109) (114) (112)
Other Loans Portfolio Segment | Commercial and industrial loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total loans 4,260   3,679      
Less: Allowance for loan losses (54) (53) (47) (38) (28) (28)
Other Loans Portfolio Segment | Other loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total loans 55   70      
Less: Allowance for loan losses $ (129) $ (110) $ (9) $ (63) $ (56) $ (113)