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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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Amount of financing receivable 90 days or more past due and still accruing.

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