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Loan Servicing Rights - Summary of Fair Values (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Freddie Mac |  |  |
Servicing Assets at Fair Value [Line Items] |  |  |
Mortgage servicing rights (MSR), fair value | $ 5,469 | $ 5,547 | $ 3,656
Mortgage servicing rights (MSR), average discount rates for estimating fair value | 9.50% | 9.50% | 9.00%
Mortgage servicing rights (MSR), average conditional prepayment rates for estimating fair value | 0.0623 | 0.0631 | 0.1271
SBA |  |  |
Servicing Assets at Fair Value [Line Items] |  |  |
Mortgage servicing rights (MSR), fair value |  | $ 99 |
Mortgage servicing rights (MSR), average discount rates for estimating fair value |  | 15.00% | 15.00%
Mortgage servicing rights (MSR), average conditional prepayment rates for estimating fair value |  | 0.1785 |

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