Condensed Consolidated Statements of Financial Condition (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2023	Sep. 30, 2022
STOCKHOLDERS’ EQUITY
Investment securities held to maturity, fair value	$ 35,028	$ 38,171
Preferred stock, shares authorized (in shares)	3,000,000	3,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Treasury stock (in shares)	149,679	90,053
Common Stock
STOCKHOLDERS’ EQUITY
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	90,000,000	90,000,000
Common stock, shares issued (in shares)	27,205,406	28,878,177
Common stock, shares outstanding (in shares)	27,055,727	28,788,124
Common Stock, Nonvoting
STOCKHOLDERS’ EQUITY
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	3,000,000	3,000,000
Common stock, shares issued (in shares)	0	0
Common stock, shares outstanding (in shares)	0	0