Loan Servicing Rights - Summary of Loans serviced for Freddie Mac (Details) - Freddie Mac - USD ($) $ in Thousands	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Servicing Assets at Fair Value [Line Items]
Loans serviced for Freddie Mac, Principal amount	$ 419,675	$ 418,559	$ 386,357
Loans serviced for SBA, Principal amount	$ 6,761	$ 8,022	$ 12,765

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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