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Loans Composition of Net Loans (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Jun. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans $ 578,902   $ 533,290      
Allowance for loan losses (5,259) $ (5,168) (5,247) $ (5,226) $ (5,226) $ (5,201)
Net deferred loan costs 749   649      
Net loans 574,392   528,692      
Residential Real Estate [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans 176,399   172,727      
Allowance for loan losses (1,379) (1,387) (1,399) (1,393) (1,382) (1,419)
Construction Real Estate [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans 36,796   34,189      
Allowance for loan losses (408) (481) (391) (404) (373) (514)
Commercial Real Estate [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans 257,192   249,063      
Allowance for loan losses (2,790) (2,753) (2,687) (2,773) (2,837) (2,792)
Commercial [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans 48,166   41,999      
Allowance for loan losses (359) (362) (342) (246) (240) (209)
Consumer [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans 3,832   3,962      
Allowance for loan losses (26) (24) (26) (27) (27) (28)
Municipal [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans 56,517   31,350      
Allowance for loan losses $ (65) $ (26) $ (40) $ (46) $ (26) $ (38)