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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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