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Loans Composition of Net Loans (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans $ 657,916   $ 642,461      
Allowance for loan losses (5,808) $ (5,676) (5,739) $ (5,610) $ (5,553) $ (5,408)
Net deferred loan costs 988   938      
Net loans 653,096   637,660      
Residential Real Estate [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans 192,617   187,320      
Allowance for loan losses (1,409) (1,396) (1,368) (1,408) (1,375) (1,361)
Construction Real Estate [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans 63,245   55,322      
Allowance for loan losses (689) (646) (617) (602) (556) (488)
Commercial Real Estate [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans 284,271   276,500      
Allowance for loan losses (3,167) (3,011) (2,933) (2,876) (2,855) (2,707)
Commercial [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans 44,536   47,228      
Allowance for loan losses (326) (313) (354) (364) (374) (395)
Consumer [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans 3,566   3,241      
Allowance for loan losses (25) (23) (23) (23) (26) (30)
Municipal [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans 69,681   72,850      
Allowance for loan losses $ (78) $ (33) $ (82) $ (81) $ (30) $ (64)