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Loans Composition of Net Loans (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans $ 533,290 $ 500,506    
Allowance for loan losses (5,247) (5,201) $ (4,694) $ (4,647)
Net deferred loan costs 649 515    
Net loans 528,692 495,820    
Residential Real Estate [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans 172,727 165,396    
Allowance for loan losses (1,399) (1,419) (1,330) (1,251)
Construction Real Estate [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans 34,189 42,889    
Allowance for loan losses (391) (514) (439) (390)
Commercial Real Estate [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans 249,063 230,442    
Allowance for loan losses (2,687) (2,792) (2,417) (2,644)
Commercial [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans 41,999 21,397    
Allowance for loan losses (342) (209) (176) (163)
Consumer [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans 3,962 3,963    
Allowance for loan losses (26) (28) (27) (23)
Municipal [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans 31,350 36,419    
Allowance for loan losses $ (40) $ (38) $ (42) $ (35)