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, 2025 |
Sep. 30, 2024 |
Mar. 31, 2024 |
|
| Derivative Instruments and Hedging Activities Disclosures [Line Items] | |||
| Notional amount | $ 225,000 | $ 175,000 | |
| Weighted-average maturity period (years) | 3 years 2 months 12 days | 3 years 2 months 12 days | |
| Weighted-average received rate | 4.32% | 4.85% | |
| Weighted-average pay rate | 3.80% | 3.83% |