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Loans - Major classifications of loans (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans $ 267,899 $ 263,973    
Net deferred loan origination costs (22) (1)    
Less: Allowance for loan losses (1,336) (1,261) $ (1,042) $ (990)
Loans receivable, net 266,541 262,711    
Real estate loans:        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans 263,700 260,224    
Real estate loans: | Secured by one-to-four family residences        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans 211,265 206,894    
Less: Allowance for loan losses (742) (816) (661) (584)
Real estate loans: | Secured by multi-family residences        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans 10,499 10,650    
Less: Allowance for loan losses (79) (80) (45) (38)
Real estate loans: | Construction        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans 8,401 10,750    
Less: Allowance for loan losses (42) (54) (31) (31)
Real estate loans: | Commercial real estate        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans 16,713 14,803    
Less: Allowance for loan losses (205) (148) (107) (84)
Real estate loans: | Home equity lines of credit        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans 16,822 17,127    
Less: Allowance for loan losses (105) (107) (114) (112)
Other Loans Portfolio Segment | Commercial and industrial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans 4,142 3,679    
Less: Allowance for loan losses (53) (47) (28) (28)
Other Loans Portfolio Segment | Other loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans 57 70    
Less: Allowance for loan losses $ (110) $ (9) $ (56) $ (113)