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SECURITIES - Narrative (Details)	6 Months Ended
	Mar. 31, 2026 USD ($) security	Mar. 31, 2025 USD ($)	Sep. 30, 2025 USD ($)
Debt Securities, Available-for-sale [Line Items]
AFS number of securities in an unrealized loss position (in securities) | security	146
Federal reserve bank stock	$ 19,700,000		$ 19,700,000
Federal home loan bank stock	5,800,000		5,000,000.0
Impairment recognized	0	$ 0
Marketable
Debt Securities, Available-for-sale [Line Items]
Equity securities	4,600,000		3,800,000
Unrealized gain (loss)	0	(100,000)
Non-marketable
Debt Securities, Available-for-sale [Line Items]
Equity securities	13,600,000		13,200,000
Unrealized gain (loss)	0	800,000
Equity securities without readily determinable fair value, amount	$ 12,600,000		$ 12,000,000.0
Number of equity securities sold | security	0
Non-marketable | Visa
Debt Securities, Available-for-sale [Line Items]
Equity securities		0
Realized gain on equity securities		$ 400,000

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