Consolidated Statements Of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Unearned Compensation ESOP [Member]	Retained Earnings [Member]	AOCI [Member]
Balance at Sep. 30, 2021	$ 1,242,273	$ 1,388	$ 1,189,633	$ (31,387)	$ 98,944	$ (16,305)
Net income	22,186				22,186
Other comprehensive income (loss), net of tax	(7,021)					(7,021)
ESOP activity	487		74	413
Restricted stock activity, net	(3)		(3)
Stock-based compensation	123		123
Cash dividends to stockholders	(41,385)				(41,385)
Balance at Dec. 31, 2021	1,216,660	1,388	1,189,827	(30,974)	79,745	(23,326)
Balance at Sep. 30, 2022	1,096,499	1,388	1,190,213	(29,735)	80,266	(145,633)
Net income	16,240				16,240
Other comprehensive income (loss), net of tax	13,031					13,031
ESOP activity	341		(72)	413
Stock-based compensation	89		89
Repurchase of common stock	(22,196)	(27)	(22,169)
Cash dividends to stockholders	(49,209)				(49,209)
Balance at Dec. 31, 2022	$ 1,054,795	$ 1,361	$ 1,168,061	$ (29,322)	$ 47,297	$ (132,602)