LOANS, Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Allowance for credit losses [Roll Forward]
Beginning balance	$ 15,379	$ 13,631	$ 15,416	$ 12,356	$ 12,356
Provision for (reversal of) loan losses	(1,800)	800	(1,500)	2,250	3,050
Charge-offs	(42)	0	(395)	(197)	(227)
Recoveries	464	25	480	47	237
Net (charge-offs) recoveries	422	25	85	(150)	10
Ending balance	14,001	14,456	14,001	14,456	15,416
Period-end amount allocated to [Abstract]
Loans individually evaluated for impairment	910	251	910	251	2,347
Loans collectively evaluated for impairment	13,091	14,205	13,091	14,205	13,069
Ending balance	14,001	14,456	14,001	14,456	15,416
Loans individually and collectively evaluated for impairment [Abstract]
Loans individually evaluated for impairment	12,839	18,106	12,839	18,106	17,471
Loans collectively evaluated for impairment	826,649	965,867	826,649	965,867	875,743
Ending balance	839,488	983,973	839,488	983,973	893,214
Commercial [Member]
Allowance for credit losses [Roll Forward]
Beginning balance	1,555	2,338	2,252	2,354	2,354
Provision for (reversal of) loan losses	119	(5)	(239)	151	(91)
Charge-offs	(36)	0	(383)	(184)	(212)
Recoveries	415	1	423	13	201
Net (charge-offs) recoveries	379	1	40	(171)	(11)
Ending balance	2,053	2,334	2,053	2,334	2,252
Period-end amount allocated to [Abstract]
Loans individually evaluated for impairment	0	16	0	16	11
Loans collectively evaluated for impairment	2,053	2,318	2,053	2,318	2,241
Ending balance	2,053	2,334	2,053	2,334	2,252
Loans individually and collectively evaluated for impairment [Abstract]
Loans individually evaluated for impairment	33	1,109	33	1,109	1,024
Loans collectively evaluated for impairment	165,628	330,336	165,628	330,336	254,902
Ending balance	165,661	331,445	165,661	331,445	255,926
Commercial Real Estate [Member]
Allowance for credit losses [Roll Forward]
Beginning balance	7,338	7,434	7,915	6,846	6,846
Provision for (reversal of) loan losses	797	1,075	220	1,663	1,069
Charge-offs	0	0	0	0	0
Recoveries	0	0	0	0	0
Net (charge-offs) recoveries	0	0	0	0	0
Ending balance	8,135	8,509	8,135	8,509	7,915
Period-end amount allocated to [Abstract]
Loans individually evaluated for impairment	0	0	0	0	0
Loans collectively evaluated for impairment	8,135	8,509	8,135	8,509	7,915
Ending balance	8,135	8,509	8,135	8,509	7,915
Loans individually and collectively evaluated for impairment [Abstract]
Loans individually evaluated for impairment	2,022	5,390	2,022	5,390	4,875
Loans collectively evaluated for impairment	482,818	450,847	482,818	450,847	449,178
Ending balance	484,840	456,237	484,840	456,237	454,053
Agriculture [Member]
Allowance for credit losses [Roll Forward]
Beginning balance	5,259	1,655	3,834	2,054	2,054
Provision for (reversal of) loan losses	(3,227)	225	(1,802)	(174)	1,780
Charge-offs	0	0	0	0	0
Recoveries	0	0	0	0	0
Net (charge-offs) recoveries	0	0	0	0	0
Ending balance	2,032	1,880	2,032	1,880	3,834
Period-end amount allocated to [Abstract]
Loans individually evaluated for impairment	818	0	818	0	2,093
Loans collectively evaluated for impairment	1,214	1,880	1,214	1,880	1,741
Ending balance	2,032	1,880	2,032	1,880	3,834
Loans individually and collectively evaluated for impairment [Abstract]
Loans individually evaluated for impairment	9,130	9,130	9,130	9,130	9,130
Loans collectively evaluated for impairment	81,691	92,915	81,691	92,915	85,918
Ending balance	90,821	102,045	90,821	102,045	95,048
Residential Mortgage [Member]
Allowance for credit losses [Roll Forward]
Beginning balance	634	540	635	466	466
Provision for (reversal of) loan losses	91	133	90	207	169
Charge-offs	0	0	0	0	0
Recoveries	0	0	0	0	0
Net (charge-offs) recoveries	0	0	0	0	0
Ending balance	725	673	725	673	635
Period-end amount allocated to [Abstract]
Loans individually evaluated for impairment	82	162	82	162	159
Loans collectively evaluated for impairment	643	511	643	511	476
Ending balance	725	673	725	673	635
Loans individually and collectively evaluated for impairment [Abstract]
Loans individually evaluated for impairment	663	1,047	663	1,047	1,036
Loans collectively evaluated for impairment	74,537	66,193	74,537	66,193	63,461
Ending balance	75,200	67,240	75,200	67,240	64,497
Residential Construction [Member]
Allowance for credit losses [Roll Forward]
Beginning balance	55	245	128	201	201
Provision for (reversal of) loan losses	26	(99)	(47)	(55)	(73)
Charge-offs	0	0	0	0	0
Recoveries	0	0	0	0	0
Net (charge-offs) recoveries	0	0	0	0	0
Ending balance	81	146	81	146	128
Period-end amount allocated to [Abstract]
Loans individually evaluated for impairment	7	72	7	72	83
Loans collectively evaluated for impairment	74	74	74	74	45
Ending balance	81	146	81	146	128
Loans individually and collectively evaluated for impairment [Abstract]
Loans individually evaluated for impairment	246	661	246	661	652
Loans collectively evaluated for impairment	4,928	5,949	4,928	5,949	3,571
Ending balance	5,174	6,610	5,174	6,610	4,223
Consumer [Member]
Allowance for credit losses [Roll Forward]
Beginning balance	186	224	214	236	236
Provision for (reversal of) loan losses	(55)	(24)	(85)	(33)	(43)
Charge-offs	(6)	0	(12)	(13)	(15)
Recoveries	49	24	57	34	36
Net (charge-offs) recoveries	43	24	45	21	21
Ending balance	174	224	174	224	214
Period-end amount allocated to [Abstract]
Loans individually evaluated for impairment	3	1	3	1	1
Loans collectively evaluated for impairment	171	223	171	223	213
Ending balance	174	224	174	224	214
Loans individually and collectively evaluated for impairment [Abstract]
Loans individually evaluated for impairment	745	769	745	769	754
Loans collectively evaluated for impairment	17,047	19,627	17,047	19,627	18,713
Ending balance	17,792	20,396	17,792	20,396	19,467
Unallocated [Member]
Allowance for credit losses [Roll Forward]
Beginning balance	352	1,195	438	199	199
Provision for (reversal of) loan losses	449	(505)	363	491	239
Charge-offs	0	0	0	0	0
Recoveries	0	0	0	0	0
Net (charge-offs) recoveries	0	0	0	0	0
Ending balance	801	690	801	690	438
Period-end amount allocated to [Abstract]
Loans individually evaluated for impairment	0	0	0	0	0
Loans collectively evaluated for impairment	801	690	801	690	438
Ending balance	$ 801	$ 690	$ 801	$ 690	$ 438