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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

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