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Derivatives and Hedging Activities - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Minimum
Derivative [Line Items]
Derivative, maturities	1 year		1 year
Maximum
Derivative [Line Items]
Derivative, maturities	7 years		7 years
Weighted average
Derivative [Line Items]
Derivative, maturities	3 years 7 months 6 days		3 years 7 months 6 days
Credit Risk Contract
Derivative [Line Items]
Notional amount	$ 69,665		$ 69,665
Interest rate contracts
Derivative [Line Items]
Derivative instruments not designated as hedging instruments, gain (loss), net	$ (12)	$ 56	$ 392	$ 126