LOANS AND ALLOWANCE FOR CREDIT LOSSES - Schedule of Allowance for Credit Losses Loans by Portfolio Segment (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended	12 Months Ended
Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Allowance for Credit Losses - Loans:
Beginning of the period	$ 21,178	$ 23,164	$ 22,908	$ 17,939	$ 17,939
Charge-offs	(54)	(57)	(71)	(154)	(160)
Recoveries	24	218	98	341	611
(Reversals)/additions to ACL - Loans via provision for credit losses charged to operations	(148)	(352)	(1,935)	141	(188)
Ending of the period	21,000	22,973	21,000	22,973	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	17,033	18,933	18,784	14,085	14,085
Charge-offs	(39)	0	(39)	(46)	(46)
Recoveries	5	206	46	236	489
(Reversals)/additions to ACL - Loans via provision for credit losses charged to operations	(76)	(284)	(1,868)	70	(254)
Ending of the period	16,923	18,855	16,923	18,855	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	1,117	1,458	1,105	2,318	2,318
Charge-offs	0	0	0	0	0
Recoveries	10	10	35	41	47
(Reversals)/additions to ACL - Loans via provision for credit losses charged to operations	224	(279)	211	(839)	(929)
Ending of the period	1,351	1,189	1,351	1,189	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	2,784	2,452	2,744	599	599
Charge-offs	(4)	(54)	(4)	(78)	(78)
Recoveries	4	0	7	40	42
(Reversals)/additions to ACL - Loans via provision for credit losses charged to operations	(290)	235	(253)	953	1,062
Ending of the period	2,494	2,633	2,494	2,633	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	244	321	275	129	129
Charge-offs	(11)	(3)	(28)	(30)	(36)
Recoveries	5	2	10	24	33
(Reversals)/additions to ACL - Loans via provision for credit losses charged to operations	(6)	(24)	(25)	(43)	(67)
Ending of the period	$ 232	296	232	296	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
Allowance for Credit Losses - Loans:
Beginning of the period		0	$ 0	808	808
Charge-offs		0		0	0
Recoveries		0		0	0
(Reversals)/additions to ACL - Loans via provision for credit losses charged to operations		0		0	0
Ending of the period		$ 0		0	0
Unallocated \| 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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Amount, excluding accrued interest, of increase in allowance for credit loss on financing receivable from recovery. Excludes net investment in lease.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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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.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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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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