Accounting Pronouncements - Additional Information (Details) - USD ($)	Jun. 30, 2024	Sep. 30, 2023
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for credit losses	$ 15,298,000	$ 18,525,000
Unfunded commitments	52,000
Retained earnings	160,770,000	$ 151,856,000
ASU 2016-13 [Member] | Cumulative Effect of Adoption [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for credit losses	2,755,000
Unfunded commitments	2,083,000
Retained earnings, before tax	672,000
Retained earnings	$ 530,000