Leases - Supplemental Balance Sheet Information (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Sep. 30, 2022
Finance Leases
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Premises, Furniture and Equipment, Net	Premises, Furniture and Equipment, Net
Premises, Furniture and Equipment, Net	$ 1,700	$ 1,910
Finance Lease, Liability, Statement of Financial Position [Extensible Enumeration]	Other Borrowings	Other Borrowings
Other Borrowings	$ 2,699	$ 2,908
Operating Leases
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Accrued Interest Receivable and Other Assets	Accrued Interest Receivable and Other Assets
Operating Lease Right-of-Use Assets	$ 5,449	$ 6,195
Operating Lease, Liability, Statement of Financial Position [Extensible Enumeration]	Accrued Interest Payable and Other Liabilities	Accrued Interest Payable and Other Liabilities
Operating Lease Liabilities	$ 5,598	$ 6,338