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Loan Servicing Rights - Summary of Fair Values (Details) - USD ($)	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Freddie Mac
Servicing Assets at Fair Value [Line Items]
Mortgage servicing rights (MSR), fair value	$ 5,547,000	$ 3,656,000	$ 3,120,000
Mortgage servicing rights (MSR), average discount rates for estimating fair value	9.50%	9.00%	9.00%
Mortgage servicing rights (MSR), average conditional prepayment rates for estimating fair value	0.0631	0.1271	0.1442
MSRs valuation allowances		$ 119,000	$ 211,000
SBA
Servicing Assets at Fair Value [Line Items]
Mortgage servicing rights (MSR), fair value		$ 99,000	$ 115,000
Mortgage servicing rights (MSR), average discount rates for estimating fair value		15.00%	15.00%
Mortgage servicing rights (MSR), average conditional prepayment rates for estimating fair value		0.1785	0.1629

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