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Servicing Rights - Summary of Loans serviced for Freddie Mac (Details) - Freddie Mac - USD ($) $ in Thousands | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018
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Servicing Assets at Fair Value [Line Items] |  |  |
Loans serviced for Freddie Mac, Principal amount | $ 418,559 | $ 386,357 | $ 370,928
Loans serviced for SBA, Principal amount | $ 8,022 | $ 12,765 | $ 754

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