LOANS AND ALLOWANCE FOR LOAN LOSSES - Activity in allowance for loan losses (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Beginning balance	$ 7,179	$ 6,762	$ 7,005	$ 6,745	$ 6,745
Charge-offs	(41)	(38)	(61)	(117)	(204)
Recoveries	2	2	2	6	14
Provision (credit)	194	46	388	138	450
Ending Balance	7,334	6,772	7,334	6,772	7,005
Ending balance: individually evaluated for impairment	4	3	4	3	1
Ending balance: collectively evaluated for impairment	7,330	6,769	7,330	6,769	7,004
Ending Balance	676,914	612,081	676,914	612,081	647,732
Ending balance: individually evaluated for impairment	13,700	13,272	13,700	13,272	12,954
Ending balance: collectively evaluated for impairment	663,214	598,809	663,214	598,809	634,778
Commercial and Industrial [Member]
Beginning balance	663	732	634	724	724
Charge-offs	(20)	0	(24)	0	0
Recoveries	0	0	0	1	6
Provision (credit)	180	(89)	213	(82)	(96)
Ending Balance	823	643	823	643	634
Ending balance: individually evaluated for impairment	0	0	0	0	0
Ending balance: collectively evaluated for impairment	823	643	823	643	634
Ending Balance	100,293	81,553	100,293	81,553	86,712
Ending balance: individually evaluated for impairment	1,062	1,105	1,062	1,105	1,084
Ending balance: collectively evaluated for impairment	99,231	80,448	99,231	80,448	85,628
Commercial Real Estate [Member]
Beginning balance	4,328	3,865	4,116	3,700	3,700
Charge-offs	(15)	0	(15)	(64)	(64)
Recoveries	0	0	0	0	0
Provision (credit)	(98)	34	114	263	480
Ending Balance	4,215	3,899	4,215	3,899	4,116
Ending balance: individually evaluated for impairment	3	0	3	0	1
Ending balance: collectively evaluated for impairment	4,212	3,899	4,212	3,899	4,115
Ending Balance	416,480	364,390	416,480	364,390	395,801
Ending balance: individually evaluated for impairment	11,531	11,333	11,531	11,333	11,158
Ending balance: collectively evaluated for impairment	404,949	353,057	404,949	353,057	384,643
Residential Real Estate [Member]
Beginning balance	1,643	1,641	1,665	1,650	1,650
Charge-offs	0	(28)	0	(28)	(69)
Recoveries	0	0	0	2	2
Provision (credit)	(35)	28	(57)	17	82
Ending Balance	1,608	1,641	1,608	1,641	1,665
Ending balance: individually evaluated for impairment	1	3	1	3	0
Ending balance: collectively evaluated for impairment	1,607	1,638	1,607	1,638	1,665
Ending Balance	154,794	160,362	154,794	160,362	159,350
Ending balance: individually evaluated for impairment	1,107	834	1,107	834	712
Ending balance: collectively evaluated for impairment	153,687	159,528	153,687	159,528	158,638
Consumer [Member]
Beginning balance	113	110	114	117	117
Charge-offs	(6)	(10)	(22)	(25)	(71)
Recoveries	2	2	2	3	6
Provision (credit)	(3)	9	12	16	62
Ending Balance	106	111	106	111	114
Ending balance: individually evaluated for impairment	0	0	0	0	0
Ending balance: collectively evaluated for impairment	106	111	106	111	114
Ending Balance	5,347	5,776	5,347	5,776	5,869
Ending balance: individually evaluated for impairment	0	0	0	0	0
Ending balance: collectively evaluated for impairment	5,347	5,776	5,347	5,776	5,869
Unallocated Financing Receivables [Member]
Beginning balance	432	414	476	554	554
Charge-offs	0	0	0	0	0
Recoveries	0	0	0	0	0
Provision (credit)	150	64	106	(76)	(78)
Ending Balance	582	478	582	478	476
Ending balance: individually evaluated for impairment	0	0	0	0	0
Ending balance: collectively evaluated for impairment	582	478	582	478	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