Leases (Details) $ in Thousands	12 Months Ended
	Sep. 30, 2025 USD ($) lease	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)
Lessee, Lease, Description [Line Items]
Number of operating leases | lease	3
Operating lease, renewal term	15 years
Operating lease right-of-use ("ROU") assets	$ 2,949	$ 1,475
Operating lease cost	417	380	$ 354
Short-term lease cost	0	0	0
Total lease cost	417	380	354
Operating cash flows from operating leases	$ 344	$ 332	$ 316
Weighted average remaining lease term-operating leases	16 years 5 months 8 days	5 years 11 months 8 days	6 years 8 months 8 days
Weighted average discount rate-operating leases	4.07%	2.34%	2.33%
Minimum
Lessee, Lease, Description [Line Items]
Operating leases, term of contract	2 years
Maximum
Lessee, Lease, Description [Line Items]
Operating leases, term of contract	24 years