LOANS AND ALLOWANCE FOR CREDIT LOSSES - Schedule of Allowance for Credit Losses Loans by Portfolio Segment (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Allowance for Credit Losses - Loans:
Beginning of the period	$ 22,908	$ 17,939	$ 17,939
Charge-offs	(5)	(57)	(160)
Recoveries	58	34	611
(Reversals)/additions to ACL - Loans via provision for credit losses charged to operations	(525)	57	(188)
Ending of the period	22,436	22,679	22,908
Cumulative Change in Accounting Principal for Adoption \| Accounting Standards Update 2016-13
Allowance for Credit Losses - Loans:
Beginning of the period		4,706	4,706
Commercial/Agricultural Real Estate
Allowance for Credit Losses - Loans:
Beginning of the period	18,784	14,085	14,085
Charge-offs	0	(32)	(46)
Recoveries	39	3	489
(Reversals)/additions to ACL - Loans via provision for credit losses charged to operations	(568)	(70)	(254)
Ending of the period	18,255	18,496	18,784
Commercial/Agricultural Real Estate \| Cumulative Change in Accounting Principal for Adoption \| Accounting Standards Update 2016-13
Allowance for Credit Losses - Loans:
Beginning of the period		4,510	4,510
C&I/Agricultural operating:
Allowance for Credit Losses - Loans:
Beginning of the period	1,105	2,318	2,318
Charge-offs	0	0	0
Recoveries	15	15	47
(Reversals)/additions to ACL - Loans via provision for credit losses charged to operations	46	(154)	(929)
Ending of the period	1,166	1,848	1,105
C&I/Agricultural operating: \| Cumulative Change in Accounting Principal for Adoption \| Accounting Standards Update 2016-13
Allowance for Credit Losses - Loans:
Beginning of the period		(331)	(331)
Residential mortgage:
Allowance for Credit Losses - Loans:
Beginning of the period	2,744	599	599
Charge-offs	0	(14)	(78)
Recoveries	1	4	42
(Reversals)/additions to ACL - Loans via provision for credit losses charged to operations	20	292	1,062
Ending of the period	2,765	2,000	2,744
Residential mortgage: \| Cumulative Change in Accounting Principal for Adoption \| Accounting Standards Update 2016-13
Allowance for Credit Losses - Loans:
Beginning of the period		1,119	1,119
Consumer installment:
Allowance for Credit Losses - Loans:
Beginning of the period	275	129	129
Charge-offs	(5)	(11)	(36)
Recoveries	3	12	33
(Reversals)/additions to ACL - Loans via provision for credit losses charged to operations	(23)	(11)	(67)
Ending of the period	250	335	275
Consumer installment: \| Cumulative Change in Accounting Principal for Adoption \| Accounting Standards Update 2016-13
Allowance for Credit Losses - Loans:
Beginning of the period		216	216
Unallocated Financing Receivables [Member]
Allowance for Credit Losses - Loans:
Beginning of the period	$ 0	808	808
Charge-offs		0	0
Recoveries		0	0
(Reversals)/additions to ACL - Loans via provision for credit losses charged to operations		0	0
Ending of the period		0	0
Unallocated Financing Receivables [Member] \| Cumulative Change in Accounting Principal for Adoption \| Accounting Standards Update 2016-13
Allowance for Credit Losses - Loans:
Beginning of the period		$ (808)	$ (808)

Amount excluding accrued interest, of allowance for credit loss on financing receivable. Excludes net investment in lease.

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-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479344/326-20-45-1

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Amount, excluding accrued interest, of increase in allowance for credit loss on financing receivable from recovery. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
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-Publisher FASB
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Amount, excluding accrued interest, of decrease in allowance for credit loss on financing receivable from writeoff. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-6

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Amount of expense related loan transactions, lease transactions, credit loss from transactions other than loan and lease transactions, and other loss based on assessment of uncollectability from the counterparty to reduce the account to their net realizable value.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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