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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

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