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Loan Servicing Rights - Summary of Loans serviced for Freddie Mac (Details) - Freddie Mac - USD ($) $ in Thousands | Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2020
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Servicing Assets at Fair Value [Line Items] |  |  |
Loans serviced for Freddie Mac, Principal amount | $ 406,727 | $ 419,675 | $ 418,559
Loans serviced for SBA, Principal amount | $ 3,560 | $ 6,761 | $ 8,022

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