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LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES - Current, past due, and non-accrual loans by categories of loans and restructured loans (Details) - USD ($) | Sep. 30, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | --- | --- | ---
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Current | $ 268,249,000 | $ 279,768,000 |  |
Past Due | 464,000 |  |  |
Non-accrual | 4,964,000 | 4,127,000 | $ 4,229,000 | $ 1,947,000
Total | 274,082,000 | 284,738,000 |  |
30-89 Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past Due | 851,000 | 822,000 |  |
Financing Receivables, Equal to Greater than 90 Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
90 Days or More and Still Accruing | 18,000 | 21,000 |  |
Consumer |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Current | 11,954,000 | 11,865,000 |  |
Non-accrual | 145,000 | 137,000 | 144,000 | 186,000
Total | 12,167,000 | 12,076,000 |  |
Consumer | 30-89 Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past Due | 68,000 | 74,000 |  |
Consumer | Real Estate Loan [Member] |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Current | 78,202,000 | 80,192,000 |  |
Non-accrual | 522,000 | 728,000 | 756,000 | 956,000
Total | 78,997,000 | 81,033,000 |  |
Consumer | Real Estate Loan [Member] | 30-89 Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past Due | 255,000 | 92,000 |  |
Consumer | Real Estate Loan [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
90 Days or More and Still Accruing | 18,000 | 21,000 |  |
Indirect |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Current | 79,800,000 | 101,605,000 |  |
Non-accrual | 216,000 | 123,000 | 36,000 | 116,000
Total | 80,544,000 | 102,384,000 |  |
Indirect | 30-89 Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past Due | 528,000 | 656,000 |  |
Commercial |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Current | 13,683,000 | 11,907,000 |  |
Non-accrual |  |  |  | 27,000
Total | 13,683,000 | 11,907,000 |  |
Commercial | Real Estate Loan [Member] |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Current | 65,260,000 | 70,882,000 |  |
Non-accrual | 4,081,000 | 3,139,000 | $ 3,293,000 | $ 662,000
Total | 69,341,000 | 74,021,000 |  |
Commercial | SBA PPP Loan [Member] |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Current | 17,367,000 |  |  |
Total | 17,367,000 | 0 |  |
Construction |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Current | 1,983,000 | 3,317,000 |  |
Total | $ 1,983,000 | $ 3,317,000 |  |

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