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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Schedule of Term Extensions (Details) - Extended Maturity - 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] |  |  |
Weighted average term increase from modification |  | 13 months | 11 months
Commercial real estate | Agricultural operating |  |  |
Financing Receivable, Modified [Line Items] |  |  |
Weighted average term increase from modification |  | 8 months |
Commercial real estate | Residential mortgage |  |  |
Financing Receivable, Modified [Line Items] |  |  |
Weighted average term increase from modification | 36 months | 61 months | 36 months
Commercial real estate | Other consumer |  |  |
Financing Receivable, Modified [Line Items] |  |  |
Weighted average term increase from modification | 12 months |  | 12 months
Financing Receivable, Other-Than-Insignificant Payment Delay | Commercial and industrial |  |  |
Financing Receivable, Modified [Line Items] |  |  |
Weighted average term increase from modification |  |  | 3 months
Financing Receivable, Other-Than-Insignificant Payment Delay | Residential mortgage |  |  |
Financing Receivable, Modified [Line Items] |  |  |
Weighted average term increase from modification |  | 3 months | 3 months
Financing Receivable, Other-Than-Insignificant Payment Delay | Commercial real estate |  |  |
Financing Receivable, Modified [Line Items] |  |  |
Weighted average term increase from modification | 3 months | 3 months | 3 months
Financing Receivable, Other-Than-Insignificant Payment Delay | Agricultural real estate |  |  |
Financing Receivable, Modified [Line Items] |  |  |
Weighted average term increase from modification |  | 9 months |
Term Extension And Principal Forgiveness | Other consumer |  |  |
Financing Receivable, Modified [Line Items] |  |  |
Weighted average term increase from modification |  | 3 months |
Decrease from modification |  | $ 2 |

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