LOANS AND ALLOWANCE FOR CREDIT LOSSES - Schedule of Nonaccrual loans (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Financing Receivable, Past Due [Line Items]
Total Nonaccrual Loans	$ 8,413	$ 10,410	$ 13,184
Nonaccrual with no Allowance for Credit Losses	7,821	3,109	12,939
Interest Income Not Recorded for Nonaccrual loans	205	165	734
Commercial/Agricultural Real Estate \| Commercial real estate
Financing Receivable, Past Due [Line Items]
Total Nonaccrual Loans	5,340	5,514	10,359
Nonaccrual with no Allowance for Credit Losses	5,125	636	10,347
Interest Income Not Recorded for Nonaccrual loans	124	20	497
Commercial/Agricultural Real Estate \| Agricultural real estate
Financing Receivable, Past Due [Line Items]
Total Nonaccrual Loans	382	2,496	391
Nonaccrual with no Allowance for Credit Losses	383	1,252	391
Interest Income Not Recorded for Nonaccrual loans	7	69
Interest Income Not Recorded for Nonaccrual loans			46
Commercial/Agricultural Real Estate \| Construction and land development
Financing Receivable, Past Due [Line Items]
Total Nonaccrual Loans			54
Nonaccrual with no Allowance for Credit Losses			54
Interest Income Not Recorded for Nonaccrual loans			1
C&I/Agricultural operating: \| Commercial and industrial
Financing Receivable, Past Due [Line Items]
Total Nonaccrual Loans	440	452
Nonaccrual with no Allowance for Credit Losses	289	15
Interest Income Not Recorded for Nonaccrual loans	8	8
C&I/Agricultural operating: \| Agricultural operating
Financing Receivable, Past Due [Line Items]
Total Nonaccrual Loans	1,106	794	1,180
Nonaccrual with no Allowance for Credit Losses	1,106	358	1,180
Interest Income Not Recorded for Nonaccrual loans	34	55	120
Residential mortgage: \| Residential mortgage
Financing Receivable, Past Due [Line Items]
Total Nonaccrual Loans	1,127	1,131	1,167
Nonaccrual with no Allowance for Credit Losses	900	825	934
Interest Income Not Recorded for Nonaccrual loans	32	12	68
Consumer installment: \| Originated indirect paper
Financing Receivable, Past Due [Line Items]
Total Nonaccrual Loans	17	21	15
Nonaccrual with no Allowance for Credit Losses	17	21	15
Interest Income Not Recorded for Nonaccrual loans	0	1	1
Consumer installment: \| Other consumer
Financing Receivable, Past Due [Line Items]
Total Nonaccrual Loans	1	2	18
Nonaccrual with no Allowance for Credit Losses	1	2	18
Interest Income Not Recorded for Nonaccrual loans	$ 0	$ 0	$ 1

Financing Receivable, Nonaccrual, Including Adjustments

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Amortized cost excluding accrued interest, of financing receivable on nonaccrual status. Excludes net investment in lease.

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-Topic 326
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Amortized cost excluding accrued interest, of financing receivable on nonaccrual status with no allowance for credit loss. Excludes net investment in lease.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Amount of interest income on financing receivable on nonaccrual status.

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