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Loans - Major classifications of loans (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total loans $ 243,147   $ 227,069      
Net deferred loan origination costs 25   113      
Less: Allowance for loan losses (1,102) $ (1,042) (990) $ (900) $ (855) $ (811)
Loans, net 242,070   226,192      
Real estate loans:            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total loans 240,556   225,047      
Real estate loans: | Secured by one-to-four family residences            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total loans 196,680   188,573      
Less: Allowance for loan losses (690) (661) (584) (569) (539) (524)
Real estate loans: | Secured by multi-family residences            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total loans 6,217   5,103      
Less: Allowance for loan losses (47) (45) (38) (39) (41) (39)
Real estate loans: | Construction            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total loans 9,807   6,134      
Less: Allowance for loan losses (49) (31) (31) (18) (8) (6)
Real estate loans: | Commercial real estate            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total loans 10,608   8,440      
Less: Allowance for loan losses (106) (107) (84) (47) (46) (35)
Real estate loans: | Home equity lines of credit            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total loans 17,244   16,797      
Less: Allowance for loan losses (109) (114) (112) (105) (104) (101)
Other Loans Portfolio Segment | Commercial and industrial            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total loans 2,518   1,947      
Less: Allowance for loan losses (38) (28) (28) (13) (11) (11)
Other Loans Portfolio Segment | Other loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total loans 73   75      
Less: Allowance for loan losses $ (63) $ (56) $ (113) $ (109) $ (106) $ (95)