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Fair Value (Details Textual) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
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 $ 1,897       $ 1,636       1,897 1,636  
Impaired loans, allowance 276       162       276 162  
Provision for loan losses 525 $ 950 $ 750 $ 775 400 $ 950 $ 950 $ 1,050 3,000 3,350 $ 3,870
Troubled debt restructurings 5,500       5,000       $ 5,500 5,000  
Other real estate owned measured at fair value less costs to sell         0         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 694       763       $ 694 763  
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 1,100       851       1,100 851 727
Impaired loans, allowance $ 227       $ 109       227 109 173
Provision for loan losses                 $ 180 $ 272 $ 139