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Derivatives and Hedging Activities - Interest Rate Contracts (Details) - Interest Rate Swaps - Cash flow hedges - Designated as Hedging Instrument - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Mar. 31, 2026	Sep. 30, 2025
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional amount	$ 300,000	$ 225,000
Weighted-average maturity period (years)	1 year 10 months 24 days	2 years 8 months 12 days
Weighted-average received rate	3.66%	4.13%
Weighted-average pay rate	3.76%	3.80%

- Definition

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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