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Loans Composition of Net 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]            
Loans $ 536,200   $ 533,290      
Allowance for loan losses (5,168) $ (5,192) (5,247) $ (5,226) $ (5,125) $ (5,201)
Net deferred loan costs 708   649      
Net loans 531,740   528,692      
Residential Real Estate [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans 175,322   172,727      
Allowance for loan losses (1,387) (1,372) (1,399) (1,382) (1,386) (1,419)
Construction Real Estate [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans 40,735   34,189      
Commercial Real Estate [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans 252,354   249,063      
Allowance for loan losses (2,753) (2,661) (2,687) (2,837) (2,729) (2,792)
Commercial [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans 46,598   41,999      
Allowance for loan losses (362) (346) (342) (240) (218) (209)
Consumer [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans 3,537   3,962      
Allowance for loan losses (24) (24) (26) (27) (25) (28)
Municipal [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans 17,654   31,350      
Allowance for loan losses $ (26) $ (42) $ (40) $ (26) $ (47) $ (38)