LOANS AND ALLOWANCE FOR LOAN LOSSES - Activity in allowance for loan losses (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Beginning balance	$ 8,680	$ 7,933	$ 7,933
Charge-offs	(2)	(23)	(158)
Recoveries	40	2	45
Credit (provision)	219	135	860
Ending Balance	8,937	8,047	8,680
Ending balance: individually evaluated for impairment		5	0
Ending balance: collectively evaluated for impairment	8,937	8,042	8,680
Ending Balance	779,028	722,989	752,841
Ending balance: individually evaluated for impairment	13,373	15,365	13,673
Ending balance: collectively evaluated for impairment	765,655	707,624	739,168
Commercial and Industrial [Member]
Beginning balance	681	787	787
Charge-offs		(13)	(13)
Recoveries	1		0
Credit (provision)	(17)	16	(93)
Ending Balance	665	790	681
Ending balance: individually evaluated for impairment			0
Ending balance: collectively evaluated for impairment	665	790	681
Ending Balance	81,831	91,296	82,526
Ending balance: individually evaluated for impairment	1,005	1,059	1,017
Ending balance: collectively evaluated for impairment	80,826	90,237	81,509
Commercial Real Estate
Beginning balance	5,408	4,762	4,762
Charge-offs			(29)
Recoveries	38		30
Credit (provision)	313	24	645
Ending Balance	5,759	4,786	5,408
Ending balance: individually evaluated for impairment		5	0
Ending balance: collectively evaluated for impairment	5,759	4,781	5,408
Ending Balance	549,921	472,989	521,654
Ending balance: individually evaluated for impairment	11,519	13,049	11,803
Ending balance: collectively evaluated for impairment	538,402	459,940	509,851
Residential Real Estate
Beginning balance	1,539	1,643	1,643
Charge-offs			(80)
Recoveries	1		4
Credit (provision)	(2)	(37)	(28)
Ending Balance	1,538	1,606	1,539
Ending balance: individually evaluated for impairment			0
Ending balance: collectively evaluated for impairment	1,538	1,606	1,539
Ending Balance	141,990	153,627	143,383
Ending balance: individually evaluated for impairment	849	1,257	853
Ending balance: collectively evaluated for impairment	141,141	152,370	142,530
Consumer [Member]
Beginning balance	84	94	94
Charge-offs	(2)	(10)	(36)
Recoveries		2	11
Credit (provision)	(4)	7	15
Ending Balance	78	93	84
Ending balance: individually evaluated for impairment			0
Ending balance: collectively evaluated for impairment	78	93	84
Ending Balance	5,286	5,077	5,278
Ending balance: individually evaluated for impairment			0
Ending balance: collectively evaluated for impairment	5,286	5,077	5,278
Unallocated Financing Receivables [Member]
Beginning balance	968	647	647
Charge-offs			0
Recoveries			0
Credit (provision)	(71)	125	321
Ending Balance	897	772	968
Ending balance: individually evaluated for impairment			0
Ending balance: collectively evaluated for impairment	$ 897	$ 772	968
Ending Balance			0
Ending balance: individually evaluated for impairment			0
Ending balance: collectively evaluated for impairment			$ 0