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SECURITIES - Narrative (Details)	6 Months Ended
	Mar. 31, 2025 USD ($) security	Mar. 31, 2024 USD ($)	Sep. 30, 2024 USD ($)
Debt Securities, Available-for-sale [Line Items]
Proceeds from sales of securities available for sale	$ 217,883,000	$ 0
AFS number of securities in an unrealized loss position (in securities) | security	152
Federal reserve bank stock	$ 19,700,000		$ 19,700,000
Federal home loan bank stock	4,600,000		16,300,000
Marketable
Debt Securities, Available-for-sale [Line Items]
Equity securities	3,600,000		3,300,000
Unrealized gain (loss)	(100,000)	0
Non-marketable
Debt Securities, Available-for-sale [Line Items]
Equity securities	12,800,000		11,800,000
Unrealized gain (loss)	800,000	$ 400,000
Equity securities without readily determinable fair value, amount	14,700,000		$ 13,600,000
Realized gain on equity securities	$ 400,000
Number of equity securities sold | security	0

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