Consolidated Balance Sheets (Parenthetical) - USD ($)	Sep. 30, 2025	Sep. 30, 2024
Statement of Financial Position [Abstract]
ACL	$ 36,000	$ 60,000
Mortgage-backed securities and other investments held to maturity-fair value	132,334,000	166,007,000
Allowance for credit losses	$ 18,091,000	$ 17,478,000
Preferred stock par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock shares authorized (in shares)	1,000,000	1,000,000
Preferred stock shares issued (in shares)	0	0
Common stock par value (in dollars per share)	$ 0.01	$ 0.01
Common stock shares authorized (in shares)	50,000,000	50,000,000
Common stock shares issued (in shares)	7,889,571	7,960,127
Common stock shares outstanding (in shares)	7,889,571	7,960,127