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Loans (Details Textual) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable, Recorded Investment, Nonaccrual Status $ 2,402,000 $ 3,718,000 $ 7,478,000
Financing Receivable, Allowance for Credit Losses 97,000 370,000 1,087,000
Impaired Financing Receivable, Interest Income, Cash Basis Method, Total 119,000 146,000 $ 224,000
Loans Pledged as Collateral 27,073,000 7,891,000  
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Liability $ 3,219,000 $ 1,375,000  
Percentages Of Principal And Accrued Interest Covered By Guarantee 98.00%