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Summary of Significant Accounting Policies - Changes from ASU Adoption (Details) - USD ($)	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Assets
ACL on investment securities	$ 36,000	$ 60,000	$ 0
ACL on loans			15,817,000
Net deferred tax asset			(26,000)
Liabilities
ACL on unfunded commitments	432,000	327,000	332,000
Total equity:	$ 262,614,000	245,413,000	233,073,000	$ 218,569,000
Impact of Adopting CECL (ASU 2016-13)
Assets
ACL on investment securities			92,000
ACL on loans			461,000
Net deferred tax asset			130,000
Liabilities
ACL on unfunded commitments			65,000
Total equity:		$ (488,000)	(488,000)
As Reported Under ASU 2016-13
Assets
ACL on investment securities			92,000
ACL on loans			16,278,000
Net deferred tax asset			104,000
Liabilities
ACL on unfunded commitments			397,000
Total equity:			$ 232,585,000

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