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Fair Value (Details Textual) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Fair value assets liabilities transfers amount between level 1 and level 2 $ 0 $ 0  
Impaired loans, unpaid principal balance with allowance recorded 1,710   $ 1,636
Impaired loans, allowance 210   162
Provision for loan losses 775 1,050  
Troubled debt restructurings $ 5,300   5,000
Maximum maturity period of short term borrowings 90 days    
Measured Using Present Value of Cash Flows      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Troubled debt restructurings $ 781   763
Collateral Dependent Impaired Loans      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Impaired loans, unpaid principal balance with allowance recorded 896   851
Impaired loans, allowance 157   $ 109
Provision for loan losses $ 66 $ 4