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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 | 9 Months Ended | 12 Months Ended
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Jun. 30, 2025 | Sep. 30, 2024
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Notional amount | $ 225,000 | $ 175,000
Weighted-average maturity period (years) | 2 years 10 months 24 days | 3 years 2 months 12 days
Weighted-average received rate | 4.33% | 4.85%
Weighted-average pay rate | 3.80% | 3.83%

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- Definition Average remaining period until maturity of the derivative contract, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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