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Recent Accounting Pronouncements - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Mar. 31, 2024 | Sep. 30, 2023 | Mar. 31, 2023 | Sep. 30, 2022
Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |
Adjustment to retained earnings, net of deferred tax; - adoption of ASU 2016-13 |  | $ 488 | $ 0 |  |  |  |
Adjustment to opening balance |  | 461 |  |  |  |  |
Allowance for Credit Losses ("ACL") |  | 72 |  | $ 85 | $ 0 |  |
Allowance for credit losses for unfunded loan commitments | $ 327 | 267 | 327 | 276 | 332 | $ 320 | $ 305
Financing Receivable, Allowance for Credit Loss, Writeoff | $ 1 | $ 87 | $ 7 |  |  |  |
Impact of Adopting CECL (ASU 2016-13) |  |  |  |  |  |  |
Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |
Allowance for Credit Losses ("ACL") |  |  |  | $ 0 | 92 |  |
Allowance for credit losses for unfunded loan commitments |  |  |  |  | $ 65 |  | $ 0

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