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LOANS - Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
LOANS
Allowance for Loan losses				$ 9,836				$ 9,309	$ 9,836	$ 9,309
Allowance for Loan losses, Charge-offs									(2,465)	(379)
Allowance for Loan losses, Recoveries									101	57
Allowance for Loan losses, Provision (Credit)	$ 620	$ 1,941	$ (176)	1,528	$ 652	$ 1,158	$ (4)	(957)	3,913	849
Allowance for Loan losses	11,385				9,836				11,385	9,836
Residential mortgage
LOANS
Allowance for Loan losses				4,182				3,986	4,182	3,986
Allowance for Loan losses, Charge-offs									0	(190)
Allowance for Loan losses, Recoveries									44	12
Allowance for Loan losses, Provision (Credit)									27	374
Allowance for Loan losses	4,253				4,182				4,253	4,182
Residential mortgage | Real estate loan | first liens
LOANS
Allowance for Loan losses				3,405				3,156	3,405	3,156
Allowance for Loan losses, Charge-offs									0	(166)
Allowance for Loan losses, Recoveries									39	4
Allowance for Loan losses, Provision (Credit)									80	411
Allowance for Loan losses	3,524				3,405				3,524	3,405
Residential mortgage | Real estate loan | junior liens
LOANS
Allowance for Loan losses				384				325	384	325
Allowance for Loan losses, Charge-offs									0	(24)
Allowance for Loan losses, Recoveries									1	2
Allowance for Loan losses, Provision (Credit)									(36)	81
Allowance for Loan losses	349				384				349	384
Residential mortgage | Home equity lines of credit
LOANS
Allowance for Loan losses				276				302	276	302
Allowance for Loan losses, Charge-offs									0	0
Allowance for Loan losses, Recoveries									4	5
Allowance for Loan losses, Provision (Credit)									1	(31)
Allowance for Loan losses	281				276				281	276
Residential mortgage | Construction Loans
LOANS
Allowance for Loan losses				117				203	117	203
Allowance for Loan losses, Charge-offs									0	0
Allowance for Loan losses, Recoveries									0	1
Allowance for Loan losses, Provision (Credit)									(18)	(87)
Allowance for Loan losses	99				117				99	117
Commercial
LOANS
Allowance for Loan losses				4,788				4,591	4,788	4,591
Allowance for Loan losses, Charge-offs									(2,343)	(6)
Allowance for Loan losses, Recoveries									16	6
Allowance for Loan losses, Provision (Credit)									3,847	197
Allowance for Loan losses	6,308				4,788				6,308	4,788
Commercial | Real estate loan
LOANS
Allowance for Loan losses				1,921				2,538	1,921	2,538
Allowance for Loan losses, Charge-offs									0	0
Allowance for Loan losses, Recoveries									0	0
Allowance for Loan losses, Provision (Credit)									1,130	(617)
Allowance for Loan losses	3,051				1,921				3,051	1,921
Commercial | Construction Loans
LOANS
Allowance for Loan losses				966				110	966	110
Allowance for Loan losses, Charge-offs									(107)	0
Allowance for Loan losses, Recoveries									0	0
Allowance for Loan losses, Provision (Credit)									(405)	856
Allowance for Loan losses	454				966				454	966
Commercial | Commercial and industrial
LOANS
Allowance for Loan losses				1,391				1,553	1,391	1,553
Allowance for Loan losses, Charge-offs									(2,236)	(6)
Allowance for Loan losses, Recoveries									16	6
Allowance for Loan losses, Provision (Credit)									3,074	(162)
Allowance for Loan losses	2,245				1,391				2,245	1,391
Commercial | Commercial Construction And Land
LOANS
Allowance for Loan losses	454								454
Commercial | Loans secured by farm land
LOANS
Allowance for Loan losses				158				102	158	102
Allowance for Loan losses, Charge-offs									0	0
Allowance for Loan losses, Recoveries									0	0
Allowance for Loan losses, Provision (Credit)									(38)	56
Allowance for Loan losses	120				158				120	158
Commercial | Multi-family (5 or more) residential
LOANS
Allowance for Loan losses				156				114	156	114
Allowance for Loan losses, Charge-offs									0	0
Allowance for Loan losses, Recoveries									0	0
Allowance for Loan losses, Provision (Credit)									80	42
Allowance for Loan losses	236				156				236	156
Commercial | Agricultural loans
LOANS
Allowance for Loan losses				41				46	41	46
Allowance for Loan losses, Charge-offs									0	0
Allowance for Loan losses, Recoveries									0	0
Allowance for Loan losses, Provision (Credit)									(7)	(5)
Allowance for Loan losses	34				41				34	41
Commercial | Other commercial loans
LOANS
Allowance for Loan losses				155				128	155	128
Allowance for Loan losses, Charge-offs									0	0
Allowance for Loan losses, Recoveries									0	0
Allowance for Loan losses, Provision (Credit)									13	27
Allowance for Loan losses	168				155				168	155
Consumer
LOANS
Allowance for Loan losses				281				233	281	233
Allowance for Loan losses, Charge-offs									(122)	(183)
Allowance for Loan losses, Recoveries									41	39
Allowance for Loan losses, Provision (Credit)									39	192
Allowance for Loan losses	239				281				239	281
Unallocated
LOANS
Allowance for Loan losses				$ 585				$ 499	585	499
Allowance for Loan losses, Charge-offs									0	0
Allowance for Loan losses, Recoveries									0	0
Allowance for Loan losses, Provision (Credit)									0	86
Allowance for Loan losses	$ 585				$ 585				$ 585	$ 585

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