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Allowance for Loan Losses - Loan losses by portfolio segment (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Balance at Beginning of Period $ 8,102 $ 9,521 $ 8,671 $ 10,214
Charge-Offs (37) (152) (341) (1,095)
Recoveries 55 70 190 220
Provision (Credit) 225 0 (175) 100
Balance at End of Period 8,345 9,439 8,345 9,439
Commercial [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Balance at Beginning of Period 2,538 3,566 3,057 4,298
Charge-Offs (1) 0 (1) (574)
Recoveries 8 17 13 29
Provision (Credit) 464 175 (60) 5
Balance at End of Period 3,009 3,758 3,009 3,758
Commercial Loans Secured by Nonowner Occupied Real Estate[Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Balance at Beginning of Period 3,425 3,686 3,389 3,666
Charge-Offs 0 0 (63) 0
Recoveries 12 12 36 38
Provision (Credit) (81) (310) (6) (316)
Balance at End of Period 3,356 3,388 3,356 3,388
Real estate - residential mortgage [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Balance at Beginning of Period 1,218 1,253 1,235 1,102
Charge-Offs 0 (123) (71) (340)
Recoveries 25 34 101 111
Provision (Credit) (46) 75 (68) 366
Balance at End of Period 1,197 1,239 1,197 1,239
Consumer [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Balance at Beginning of Period 124 125 127 128
Charge-Offs (36) (29) (206) (181)
Recoveries 10 7 40 42
Provision (Credit) 28 25 165 139
Balance at End of Period 126 128 126 128
Allocation for General Risk [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Balance at Beginning of Period 797 891 863 1,020
Charge-Offs 0 0 0 0
Recoveries 0 0 0 0
Provision (Credit) (140) 35 (206) (94)
Balance at End of Period $ 657 $ 926 $ 657 $ 926