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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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- Definition

Number of financing receivables accounts that have been modified by troubled debt restructurings within the previous 12 months and for which there was a payment default.

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