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ALLOWANCE FOR LOAN LOSSES - Investment in impaired loans and related interest income (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Average loan balance: |  |  |
Average investment in impaired loans | $ 607 | $ 240 | $ 1,913
Interest income recognized: |  |  |
Interest income recognized on a cash basis on impaired loans | 30 |  | 12
Commercial [Member] |  |  |
Average loan balance: |  |  |
Average investment in impaired loans | 597 | 228 | 1,075
Interest income recognized: |  |  |
Interest income recognized on a cash basis on impaired loans | 30 |  | 12
Commercial loans secured by non-owner occupied real estate [Member] |  |  |
Average loan balance: |  |  |
Average investment in impaired loans | $ 10 | $ 12 | $ 838

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- Definition Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=118936363&loc=d3e5212-111524 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118936363&loc=d3e5258-111524 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
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- Definition Amount of interest income recognized on a cash-basis method of accounting that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=118936363&loc=d3e5212-111524 + Details
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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