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Fair Value (Details Textual)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
USD ($)
Property
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
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 1,636 2,710 $ 4,014
Impaired loans, allowance 162 249 497
Provision for loan losses 3,350 3,870 $ 3,510
Troubled debt restructurings $ 5,000 7,000  
Number of properties charged down reflecting updated appraisals | Property 1    
Other real estate owned measured at fair value less costs to sell $ 0    
Write down of other real estate owned $ 23 36  
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 $ 763 2,000  
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 851 727  
Impaired loans, allowance 109 173  
Provision for loan losses $ 272 $ 139