Leases (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Lessee, Lease, Description [Line Items]
Operating lease, renewal term	5 years
Operating lease right-of-use ("ROU") assets	$ 1,980	$ 2,283
Operating lease cost	371	395	$ 377
Short-term lease cost	0	0	0
Total lease cost	371	395	377
Operating cash flows from operating leases	$ 342	$ 327	$ 318
Weighted average remaining lease term-operating leases	7 years 8 months 1 day	8 years 5 months 8 days	9 years 2 months 26 days
Weighted average discount rate-operating leases	2.25%	2.24%	2.22%
Minimum
Lessee, Lease, Description [Line Items]
Operating leases, term of contract	4 years
Maximum
Lessee, Lease, Description [Line Items]
Operating leases, term of contract	9 years