Leases (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Lessee, Lease, Description [Line Items]
Operating lease, renewal term	5 years
Operating lease right-of-use ("ROU") assets	$ 1,475	$ 1,772
Operating lease cost	380	354	$ 371
Short-term lease cost	0	0	0
Total lease cost	380	354	371
Operating cash flows from operating leases	$ 332	$ 316	$ 342
Weighted average remaining lease term-operating leases	5 years 11 months 8 days	6 years 8 months 8 days	7 years 8 months 1 day
Weighted average discount rate-operating leases	2.34%	2.33%	2.25%
Minimum
Lessee, Lease, Description [Line Items]
Operating leases, term of contract	2 years
Maximum
Lessee, Lease, Description [Line Items]
Operating leases, term of contract	7 years