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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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