LOANS AND RELATED ALLOWANCE FOR LOAN LOSSES, Allowance for Loan Losses by Portfolio Segment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	$ 17,304	$ 15,815	$ 13,845
Charge-offs	(472)	(214)	(533)
Recoveries	37	153	103
Provision	1,683	1,550	2,400
Balance at end of period	18,552	17,304	15,815
Individually evaluated for impairment	102	121	510
Collectively evaluated for impairment	18,450	17,183	15,305
Real Estate Loans [Member] | Residential [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	1,147	1,174	1,114
Charge-offs	0	0	0
Recoveries	0	0	14
Provision	(91)	(27)	46
Balance at end of period	1,056	1,147	1,174
Individually evaluated for impairment	4	12	18
Collectively evaluated for impairment	1,052	1,135	1,156
Real Estate Loans [Member] | Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	8,099	6,216	4,549
Charge-offs	0	(54)	(435)
Recoveries	3	89	37
Provision	2,018	1,848	2,065
Balance at end of period	10,120	8,099	6,216
Individually evaluated for impairment	57	61	95
Collectively evaluated for impairment	10,063	8,038	6,121
Real Estate Loans [Member] | Agricultural [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	4,729	4,953	5,022
Charge-offs	0	0	(4)
Recoveries	0	0	19
Provision	(140)	(224)	(84)
Balance at end of period	4,589	4,729	4,953
Individually evaluated for impairment	24	14	83
Collectively evaluated for impairment	4,565	4,715	4,870
Real Estate Loans [Member] | Construction [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	434	122	43
Charge-offs	0	0	0
Recoveries	0	0	0
Provision	367	312	79
Balance at end of period	801	434	122
Individually evaluated for impairment	0	0	0
Collectively evaluated for impairment	801	434	122
Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	262	321	112
Charge-offs	(37)	(27)	(50)
Recoveries	21	21	21
Provision	(111)	(53)	238
Balance at end of period	135	262	321
Individually evaluated for impairment	4	0	0
Collectively evaluated for impairment	131	262	321
Other Commercial Loans [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	1,023	1,226	1,255
Charge-offs	(435)	(133)	(44)
Recoveries	13	43	12
Provision	439	(113)	3
Balance at end of period	1,040	1,023	1,226
Individually evaluated for impairment	13	34	170
Collectively evaluated for impairment	1,027	989	1,056
Other Agricultural Loans [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	558	864	961
Charge-offs	0	0	0
Recoveries	0	0	0
Provision	(69)	(306)	(97)
Balance at end of period	489	558	864
Individually evaluated for impairment	0	0	144
Collectively evaluated for impairment	489	558	720
State and Political Subdivision Loans [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	281	479	536
Charge-offs	0	0	0
Recoveries	0	0	0
Provision	41	(198)	(57)
Balance at end of period	322	281	479
Individually evaluated for impairment	0	0	0
Collectively evaluated for impairment	322	281	479
Unallocated [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	771	460	253
Charge-offs	0	0	0
Recoveries	0	0	0
Provision	(771)	311	207
Balance at end of period	0	771	460
Individually evaluated for impairment	0	0	0
Collectively evaluated for impairment	$ 0	$ 771	$ 460