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Fair Value (Details Textual) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
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 $ 920       $ 1,897       920 1,897  
Impaired loans, allowance 61       276       61 276  
Provision for loan losses 600 $ 550 $ 750 $ 550 525 $ 950 $ 750 $ 775 2,450 3,000 $ 3,350
Troubled debt restructurings 4,600       5,500       4,600 5,500  
Other real estate owned measured at fair value less costs to sell 0               0    
Write down of other real estate owned                 $ 68    
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 583       694       $ 583 694  
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 208       1,100       208 1,100  
Impaired loans, allowance $ 13       $ 227       13 227  
Provision for loan losses                 $ 134 $ 180