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Summary of Significant Accounting Policies - Changes from ASU Adoption (Details) - USD ($) | Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022
--- | --- | --- | --- | ---
Assets |  |  |  |
ACL on investment securities | $ 36,000 | $ 60,000 | $ 0 |
ACL on loans |  |  | 15,817,000 |
Net deferred tax asset |  |  | (26,000) |
Liabilities |  |  |  |
ACL on unfunded commitments | 432,000 | 327,000 | 332,000 |
Total equity: | $ 262,614,000 | 245,413,000 | 233,073,000 | $ 218,569,000
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) | (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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