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Servicing Rights - Summary of Loans serviced for Freddie Mac (Details) - Freddie Mac - USD ($) $ in Thousands | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
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Servicing Assets at Fair Value [Line Items] |  |  |
Loans serviced for Freddie Mac, Principal amount | $ 386,357 | $ 370,928 | $ 358,173
Loans serviced for SBA, Principal amount | $ 12,765 | $ 754 | $ 697

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