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LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES - Credit Quality Information (Details) | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2020 USD ($) loan | Dec. 31, 2019 USD ($) loan | Sep. 30, 2019 USD ($) | Dec. 31, 2018 USD ($)
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total | $ 274,082,000 | $ 284,738,000 |  |
Non-accrual | 4,964,000 | 4,127,000 | $ 4,229,000 | $ 1,947,000
Troubled debt restructures | $ 39,000 | $ 41,000 |  |
Number of TDRs accounts | loan | 1 | 1 |  |
Non-performing TDRs | 39 | 41,000 |  |
Number of non-performing TDRs accounts | loan | 1 | 1 |  |
Pass |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total | $ 268,692,000 | $ 280,070,000 |  |
Substandard |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total | 5,223,000 | 4,589,000 |  |
Doubtful |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total | 167,000 | 79,000 |  |
Consumer |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total | 12,167,000 | 12,076,000 |  |
Non-accrual | 145,000 | 137,000 | 144,000 | 186,000
Troubled debt restructures | $ 39,000 | $ 41,000 |  |
Number of TDRs accounts | loan | 1 | 1 |  |
Non-performing TDRs | 39 | 41,000 |  |
Number of non-performing TDRs accounts | loan | 1 | 1 |  |
Consumer | Pass |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total | $ 12,084,000 | $ 11,939,000 |  |
Consumer | Substandard |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total | 83,000 | 137,000 |  |
Consumer | Real Estate Loan [Member] |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total | 78,997,000 | 81,033,000 |  |
Non-accrual | 522,000 | 728,000 | 756,000 | 956,000
Consumer | Real Estate Loan [Member] | Pass |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total | 78,475,000 | 80,305,000 |  |
Consumer | Real Estate Loan [Member] | Substandard |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total | 522,000 | 728,000 |  |
Indirect |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total | 80,544,000 | 102,384,000 |  |
Non-accrual | 216,000 | 123,000 | 36,000 | 116,000
Indirect | Pass |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total | 80,328,000 | 102,261,000 |  |
Indirect | Substandard |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total | 49,000 | 44,000 |  |
Indirect | Doubtful |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total | 167,000 | 79,000 |  |
Commercial |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total | 13,683,000 | 11,907,000 |  |
Non-accrual |  |  |  | 27,000
Commercial | Pass |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total | 13,683,000 | 11,907,000 |  |
Commercial | Real Estate Loan [Member] |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total | 69,341,000 | 74,021,000 |  |
Non-accrual | 4,081,000 | 3,139,000 | $ 3,293,000 | $ 662,000
Commercial | Real Estate Loan [Member] | Pass |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total | 64,772,000 | 70,341,000 |  |
Commercial | Real Estate Loan [Member] | Substandard |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total | 4,569,000 | 3,680,000 |  |
Commercial | SBA PPP Loan [Member] |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total | 17,367,000 | 0 |  |
Commercial | SBA PPP Loan [Member] | Pass |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total | 17,367,000 |  |  |
Construction |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total | 1,983,000 | 3,317,000 |  |
Construction | Pass |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total | $ 1,983,000 | $ 3,317,000 |  |

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