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Summary of Significant Accounting Policies - Changes from ASU Adoption (Details) - USD ($) | Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
--- | --- | --- | --- | ---
Assets |  |  |  |
ACL on investment securities | $ 60,000 | $ 0 |  |
ACL on loans | 17,478,000 | 15,817,000 |  |
Net deferred tax asset |  | (26,000) |  |
Liabilities |  |  |  |
ACL on unfunded commitments | 327,000 | 332,000 |  |
Total equity: | $ 245,413,000 | 233,073,000 | $ 218,569,000 | $ 206,899,000
Impact of Adopting CECL (ASU 2016-13) |  |  |  |
Assets |  |  |  |
ACL on investment securities |  | 92,000 |  |
ACL on loans |  | 461,000 |  |
Net deferred tax asset |  | 130,000 |  |
Liabilities |  |  |  |
ACL on unfunded commitments |  | 65,000 |  |
Total equity: |  | (488,000) |  |
As Reported Under ASU 2016-13 |  |  |  |
Assets |  |  |  |
ACL on investment securities |  | 92,000 |  |
ACL on loans |  | 16,278,000 |  |
Net deferred tax asset |  | 104,000 |  |
Liabilities |  |  |  |
ACL on unfunded commitments |  | 397,000 |  |
Total equity: |  | $ 232,585,000 |  |

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