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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Schedule of Loan Modifications (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Commercial real estate | Commercial and industrial |  |  |
Financing Receivable, Modified [Line Items] |  |  |
Amortized cost basis |  | $ 646 | $ 1,500
% of Total Class of Financing Receivables |  | 0.64% | 1.26%
Commercial real estate | Agricultural operating |  |  |
Financing Receivable, Modified [Line Items] |  |  |
Amortized cost basis |  | $ 200 |
% of Total Class of Financing Receivables |  | 0.66% |
Commercial real estate | Residential mortgage |  |  |
Financing Receivable, Modified [Line Items] |  |  |
Amortized cost basis | $ 5 | $ 13 | $ 5
% of Total Class of Financing Receivables | 0.00% | 0.01% | 0.00%
Commercial real estate | Other consumer |  |  |
Financing Receivable, Modified [Line Items] |  |  |
Amortized cost basis | $ 1 |  | $ 1
% of Total Class of Financing Receivables | 0.02% |  | 0.02%
Financing Receivable, Other-Than-Insignificant Payment Delay | Commercial and industrial |  |  |
Financing Receivable, Modified [Line Items] |  |  |
Amortized cost basis |  |  | $ 836
% of Total Class of Financing Receivables |  |  | 0.70%
Financing Receivable, Other-Than-Insignificant Payment Delay | Residential mortgage |  |  |
Financing Receivable, Modified [Line Items] |  |  |
Amortized cost basis |  | $ 120 | $ 240
% of Total Class of Financing Receivables |  | 0.10% | 0.18%
Financing Receivable, Other-Than-Insignificant Payment Delay | Commercial real estate |  |  |
Financing Receivable, Modified [Line Items] |  |  |
Amortized cost basis | $ 1,182 | $ 4,263 | $ 1,182
% of Total Class of Financing Receivables | 0.16% | 0.62% | 0.16%
Financing Receivable, Other-Than-Insignificant Payment Delay | Agricultural real estate |  |  |
Financing Receivable, Modified [Line Items] |  |  |
Amortized cost basis |  | $ 197 |
% of Total Class of Financing Receivables |  | 0.31% |
Financing Receivable, Other-Than-Insignificant Payment Delay | Other consumer |  |  |
Financing Receivable, Modified [Line Items] |  |  |
Amortized cost basis |  | $ 1 |
% of Total Class of Financing Receivables |  | 0.02% |

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