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Commitments and Contingencies - Additional Information (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Jun. 30, 2024
Loss Contingencies [Line Items] |  |  |
Unfunded loan related commitments | $ 64,200,000 |  | $ 72,100,000
Unfunded loan related commitments expiration period | 3 months |  | 3 months
Liability for credit losses for unfunded commitments | $ 41,000 |  | $ 0
Unfunded commitments expense | 41,000 | $ 0 |
Unused Equity Lines of Credit |  |  |
Loss Contingencies [Line Items] |  |  |
Unfunded loan related commitments | 36,100,000 |  | 36,100,000
Originate and Purchase Loans |  |  |
Loss Contingencies [Line Items] |  |  |
Unfunded loan related commitments | $ 28,100,000 |  | $ 36,000,000

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