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Loan Servicing Rights - Summary of Fair Values (Details) - Freddie Mac - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023
Servicing Assets at Fair Value [Line Items] |  |  |
Mortgage servicing rights (MSR), fair value | $ 4,634 | $ 4,655 | $ 5,469
Mortgage servicing rights (MSR), average discount rates for estimating fair value | 9.00% | 10.00% | 9.50%
Mortgage servicing rights (MSR), average conditional prepayment rates for estimating fair value | 0.0737 | 0.0703 | 0.0623

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