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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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%