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ALLOWANCE FOR LOAN LOSSES - Loan losses by portfolio segment (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Balance at Beginning of Period | $ 8,671 | $ 10,214 | $ 9,932
Charge-Offs | (432) | (1,205) | (928)
Recoveries | 240 | 262 | 410
Provision (Credit) | 800 | (600) | 800
Balance at End of Period | 9,279 | 8,671 | 10,214
Commercial [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Balance at Beginning of Period | 3,057 | 4,298 | 4,041
Charge-Offs | (9) | (574) | (311)
Recoveries | 22 | 31 | 27
Provision (Credit) | 881 | (698) | 541
Balance at End of Period | 3,951 | 3,057 | 4,298
Commercial loans secured by non-owner occupied real estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Balance at Beginning of Period | 3,389 | 3,666 | 3,584
Charge-Offs | (63) | 0 | (132)
Recoveries | 48 | 51 | 56
Provision (Credit) | (255) | (328) | 158
Balance at End of Period | 3,119 | 3,389 | 3,666
Real estate - residential mortgage [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Balance at Beginning of Period | 1,235 | 1,102 | 1,169
Charge-Offs | (98) | (380) | (313)
Recoveries | 118 | 119 | 207
Provision (Credit) | (96) | 394 | 39
Balance at End of Period | 1,159 | 1,235 | 1,102
Consumer [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Balance at Beginning of Period | 127 | 128 | 151
Charge-Offs | (262) | (251) | (172)
Recoveries | 52 | 61 | 120
Provision (Credit) | 209 | 189 | 29
Balance at End of Period | 126 | 127 | 128
Allocation for General Risk [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Balance at Beginning of Period | 863 | 1,020 | 987
Charge-Offs | 0 | 0 | 0
Recoveries | 0 | 0 | 0
Provision (Credit) | 61 | (157) | 33
Balance at End of Period | $ 924 | $ 863 | $ 1,020

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