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Loans, Allowance for Credit Losses, and Asset Quality Information - Summary of Catastrophic Event Impact (Details) - Hurricane - USD ($) $ in Thousands | Jun. 30, 2025 | Sep. 30, 2024
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Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Total loans | $ 702,538 | $ 755,000
Commercial and industrial |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Total loans | 15,997 |
Real estate, commercial | Construction, development & other land loans |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Total loans | 15,933 |
Real estate, commercial | Commercial real estate - owner occupied |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Total loans | 91,485 |
Real estate, commercial | Commercial real estate - non owner occupied |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Total loans | 270,597 |
Real estate, commercial | Multi-family real estate |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Total loans | 24,838 |
Real estate, mortgage | Residential 1-4 family real estate |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Total loans | 247,503 |
Real estate, mortgage | Home equity loans/lines of credit |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Total loans | $ 36,185 |

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