Consolidated Statements Of Stockholders' Equity - USD ($) $ in Thousands	Total	Cumulative effect of adopting Accounting Standards Update ("ASU") 2022-02, net of tax [Member]	Common Stock [Member]	Additional Paid-In Capital [Member]	Unearned Compensation ESOP [Member]	(Accumulated Deficit) / Retained Earnings [Member]	(Accumulated Deficit) / Retained Earnings [Member] Cumulative effect of adopting Accounting Standards Update ("ASU") 2022-02, net of tax [Member]	AOCI [Member]
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)
Balance at Sep. 30, 2022	1,096,499		1,388	1,190,213	(29,735)	80,266		(145,633)
Net income	38,731
Other comprehensive income (loss), net of tax								18,927
Balance at Jun. 30, 2023	1,061,285		1,361	1,167,979	(28,497)	47,148		(126,706)
Balance at Dec. 31, 2022	1,054,795		1,361	1,168,061	(29,322)	47,297		(132,602)
Net income	14,189					14,189
Other comprehensive income (loss), net of tax	13,959							13,959
ESOP activity	336			(76)	412
Stock-based compensation	74			74
Cash dividends to stockholders	(11,319)					(11,319)
Balance at Mar. 31, 2023	1,072,034		1,361	1,168,059	(28,910)	50,167		(118,643)
Net income	8,302					8,302
Other comprehensive income (loss), net of tax	(8,063)							(8,063)
ESOP activity	258			(155)	413
Stock-based compensation	75			75
Cash dividends to stockholders	(11,321)					(11,321)
Balance at Jun. 30, 2023	1,061,285		1,361	1,167,979	(28,497)	47,148		(126,706)
Balance at Sep. 30, 2023	1,044,054		1,359	1,166,643	(28,083)	(104,565)		8,700
Balance (Accounting Standards Update 2022-02 [Member]) at Sep. 30, 2023		$ (27)					$ (27)
Net income	2,543					2,543
Other comprehensive income (loss), net of tax	10,455							10,455
ESOP activity	222			(190)	412
Restricted stock activity, net	(6)			(6)
Stock-based compensation	87			87
Repurchase of common stock	(11,899)		(20)	(11,879)
Cash dividends to stockholders	(11,308)					(11,308)
Balance at Dec. 31, 2023	1,034,121		1,339	1,154,655	(27,671)	(113,357)		19,155
Balance at Sep. 30, 2023	1,044,054		1,359	1,166,643	(28,083)	(104,565)		8,700
Balance (Accounting Standards Update 2022-02 [Member]) at Sep. 30, 2023		$ (27)					$ (27)
Net income	25,953
Other comprehensive income (loss), net of tax								2,683
Balance at Jun. 30, 2024	1,020,676		1,327	1,146,928	(26,844)	(112,118)		11,383
Balance at Dec. 31, 2023	1,034,121		1,339	1,154,655	(27,671)	(113,357)		19,155
Net income	13,762					13,762
Other comprehensive income (loss), net of tax	(4,628)							(4,628)
ESOP activity	245			(168)	413
Restricted stock activity, net	(2)		1	(3)
Stock-based compensation	82			82
Repurchase of common stock	(7,550)		(13)	(7,537)
Cash dividends to stockholders	(11,127)					(11,127)
Balance at Mar. 31, 2024	1,024,903		1,327	1,147,029	(27,258)	(110,722)		14,527
Net income	9,648					9,648
Other comprehensive income (loss), net of tax	(3,144)							(3,144)
ESOP activity	217			(197)	414
Restricted stock activity, net	(1)			(1)
Stock-based compensation	97			97
Cash dividends to stockholders	(11,044)					(11,044)
Balance at Jun. 30, 2024	$ 1,020,676		$ 1,327	$ 1,146,928	$ (26,844)	$ (112,118)		$ 11,383