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Servicing Rights - Summary of Fair Values (Details) - USD ($) | 12 Months Ended
--- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
Servicing Assets at Fair Value [Line Items] |  |  |
MSRs valuation allowances |  | $ 0 | $ 0
SBA |  |  |
Servicing Assets at Fair Value [Line Items] |  |  |
Mortgage servicing rights (MSR), fair value | $ 202,000 |  |
Mortgage servicing rights (MSR), average discount rates for estimating fair value | 15.00% |  |
Mortgage servicing rights (MSR), average conditional prepayment rates for estimating fair value | 0.1613 |  |
MSRs valuation allowances | $ 4,000 |  |
Freddie Mac |  |  |
Servicing Assets at Fair Value [Line Items] |  |  |
Mortgage servicing rights (MSR), fair value | $ 3,694,000 | $ 4,171,000 | $ 3,556,000
Mortgage servicing rights (MSR), average discount rates for estimating fair value | 9.00% | 8.99% | 9.52%
Mortgage servicing rights (MSR), average conditional prepayment rates for estimating fair value | 0.1131 | 0.0810 | 0.0990

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- Definition -- None. No documentation exists for this element. -- + References No definition available. + Details
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