LOANS AND ALLOWANCE FOR LOAN LOSSES - Activity in allowance for loan losses (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Beginning balance	$ 7,334	$ 6,772	$ 7,005	$ 6,745	$ 6,745
Charge-offs	(57)	(34)	(118)	(151)	(204)
Recoveries	8	7	10	13	14
Provision (credit)	294	175	682	313	450
Ending Balance	7,579	6,920	7,579	6,920	7,005
Ending balance: individually evaluated for impairment	2	1	2	1	1
Ending balance: collectively evaluated for impairment	7,577	6,919	7,577	6,919	7,004
Ending Balance	704,040	631,185	704,040	631,185	647,732
Ending balance: individually evaluated for impairment	13,972	13,164	13,972	13,164	12,954
Ending balance: collectively evaluated for impairment	690,068	618,021	690,068	618,021	634,778
Commercial and Industrial [Member]
Beginning balance	823	643	634	724	724
Charge-offs	(15)	0	(39)	0	0
Recoveries	4	5	4	6	6
Provision (credit)	22	(18)	235	(100)	(96)
Ending Balance	834	630	834	630	634
Ending balance: individually evaluated for impairment	0	0	0	0	0
Ending balance: collectively evaluated for impairment	834	630	834	630	634
Ending Balance	100,297	85,738	100,297	85,738	86,712
Ending balance: individually evaluated for impairment	1,101	1,095	1,101	1,095	1,084
Ending balance: collectively evaluated for impairment	99,196	84,643	99,196	84,643	85,628
Commercial Real Estate [Member]
Beginning balance	4,215	3,899	4,116	3,700	3,700
Charge-offs	(16)	0	(31)	(64)	(64)
Recoveries	0	0	0	0	0
Provision (credit)	266	150	380	413	480
Ending Balance	4,465	4,049	4,465	4,049	4,116
Ending balance: individually evaluated for impairment	1	1	1	1	1
Ending balance: collectively evaluated for impairment	4,464	4,048	4,464	4,048	4,115
Ending Balance	441,095	379,665	441,095	379,665	395,801
Ending balance: individually evaluated for impairment	11,775	11,264	11,775	11,264	11,158
Ending balance: collectively evaluated for impairment	429,320	368,401	429,320	368,401	384,643
Residential Real Estate [Member]
Beginning balance	1,608	1,641	1,665	1,650	1,650
Charge-offs	(13)	(16)	(13)	(44)	(69)
Recoveries	0	0	0	2	2
Provision (credit)	37	16	(20)	33	82
Ending Balance	1,632	1,641	1,632	1,641	1,665
Ending balance: individually evaluated for impairment	1	0	1	0	0
Ending balance: collectively evaluated for impairment	1,631	1,641	1,631	1,641	1,665
Ending Balance	157,539	159,897	157,539	159,897	159,350
Ending balance: individually evaluated for impairment	1,096	805	1,096	805	712
Ending balance: collectively evaluated for impairment	156,443	159,092	156,443	159,092	158,638
Consumer [Member]
Beginning balance	106	111	114	117	117
Charge-offs	(13)	(18)	(35)	(43)	(71)
Recoveries	4	2	6	5	6
Provision (credit)	4	15	16	31	62
Ending Balance	101	110	101	110	114
Ending balance: individually evaluated for impairment	0	0	0	0	0
Ending balance: collectively evaluated for impairment	101	110	101	110	114
Ending Balance	5,109	5,885	5,109	5,885	5,869
Ending balance: individually evaluated for impairment	0	0	0	0	0
Ending balance: collectively evaluated for impairment	5,109	5,885	5,109	5,885	5,869
Unallocated Financing Receivables [Member]
Beginning balance	582	478	476	554	554
Charge-offs	0	0	0	0	0
Recoveries	0	0	0	0	0
Provision (credit)	(35)	12	71	(64)	(78)
Ending Balance	547	490	547	490	476
Ending balance: individually evaluated for impairment	0	0	0	0	0
Ending balance: collectively evaluated for impairment	547	490	547	490	476
Ending Balance	0	0	0	0	0
Ending balance: individually evaluated for impairment	0	0	0	0	0
Ending balance: collectively evaluated for impairment	$ 0	$ 0	$ 0	$ 0	$ 0