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Recent Accounting Pronouncements - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Sep. 30, 2023
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") | 82 |  | $ 0
Allowance for credit losses for unfunded loan commitments | 364 |  | 332
Financing Receivable, Allowance for Credit Loss, Writeoff | $ 2 | $ 0 |
Impact of Adopting CECL (ASU 2016-13) |  |  |
Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Line Items] |  |  |
Allowance for Credit Losses ("ACL") |  |  | 92
Allowance for credit losses for unfunded loan commitments |  |  | $ 65

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