CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (Unaudited) - USD ($) $ in Thousands	Total	MSB Financial Corporation [Member]	Cumulative Effect Period Of Adoption Adjustment [Member]	Common Stock [Member]	Paid-in Capital [Member]	Retained Earnings [Member]	Retained Earnings [Member] Cumulative Effect Period Of Adoption Adjustment [Member]	Unearned ESOP Shares [Member]	Accumulated Other Comprehensive Income [Member]
Balance (in value) at Jun. 30, 2020	$ 1,084,177			$ 837	$ 722,871	$ 387,911		$ (28,699)	$ 1,257
Balance (in shares) at Jun. 30, 2020				83,663
Cumulative effect of change in accounting principle for the adoption of ASU 2017-08 at Jun. 30, 2020			$ (14,239)				$ (14,239)
Balance - July 1, 2020 as adjusted for change in accounting principle at Jun. 30, 2020	1,069,938			$ 837	722,871	373,672		(28,699)	1,257
Net Income	44,750					44,750
Other comprehensive income (loss), net of income tax	100								100
Accretion Amortization Of ESOP Award	1,435				(25)			1,460
Stock option exercise	373				373
Stock option exercise (in shares)				41
Stock repurchases (in value)	(80,567)			$ (74)	(80,493)
Stock repurchases (in shares)				(7,535)
Stock-based compensation expense	4,281				4,281
Cancellation of shares issued for restricted stock awards (in value)	(803)			$ (1)	(802)
Cancellation of shares issued for restricted stock awards (in shares)				(80)
Shares issued in conjunction with the acquisition of MSB Financial Corp (Share).				5,854
Shares issued in conjunction with the acquisition of MSB Financial Corp.	45,133			$ 58	45,075
Cash dividends declared		$ (20,828)				20,828
Balance (in value) at Mar. 31, 2021	1,063,812			$ 820	691,280	397,594		(27,239)	1,357
Balance (in shares) at Mar. 31, 2021				81,943
Balance (in value) at Dec. 31, 2020	1,092,341			$ 849	724,389	388,376		(27,726)	6,453
Balance (in shares) at Dec. 31, 2020				84,938
Net Income	16,423					16,423
Other comprehensive income (loss), net of income tax	(5,096)								(5,096)
Accretion Amortization Of ESOP Award	574				87			487
Stock option exercise	373				373
Stock option exercise (in shares)				41
Stock repurchases (in value)	(34,863)			$ (29)	(34,834)
Stock repurchases (in shares)				(3,026)
Stock-based compensation expense	1,379				1,379
Cancellation of shares issued for restricted stock awards (in value)	(114)				(114)
Cancellation of shares issued for restricted stock awards (in shares)				(10)
Cash dividends declared	(7,205)					7,205
Balance (in value) at Mar. 31, 2021	1,063,812			$ 820	691,280	397,594		(27,239)	1,357
Balance (in shares) at Mar. 31, 2021				81,943
Balance (in value) at Jun. 30, 2021	$ 1,042,944			$ 790	654,396	408,367		(26,753)	6,144
Balance (in shares) at Jun. 30, 2021	78,964,859			78,965
Net Income	$ 56,177					56,177
Other comprehensive income (loss), net of income tax	(29,093)								29,093
Accretion Amortization Of ESOP Award	1,945				486			1,459
Stock repurchases (in value)	(95,967)			$ (75)	(95,892)
Stock repurchases (in shares)				(7,468)
Stock-based compensation expense	3,117				3,117
Cancellation of shares issued for restricted stock awards (in value)	(932)			$ (1)	(931)
Cancellation of shares issued for restricted stock awards (in shares)				(73)
Cash dividends declared	(23,022)					23,022
Balance (in value) at Mar. 31, 2022	955,169			$ 714	561,176	441,522		(25,294)	(22,949)
Balance (in shares) at Mar. 31, 2022				71,424
Balance (in value) at Dec. 31, 2021	995,470			$ 735	587,392	431,549		(25,780)	1,574
Balance (in shares) at Dec. 31, 2021				73,453
Net Income	17,693					17,693
Other comprehensive income (loss), net of income tax	(24,523)								24,523
Accretion Amortization Of ESOP Award	666				180			486
Stock repurchases (in value)	(26,969)			$ (21)	(26,948)
Stock repurchases (in shares)				(2,020)
Stock-based compensation expense	676				676
Cancellation of shares issued for restricted stock awards (in value)	(124)				(124)
Cancellation of shares issued for restricted stock awards (in shares)				(9)
Cash dividends declared	(7,720)					7,720
Balance (in value) at Mar. 31, 2022	$ 955,169			$ 714	$ 561,176	$ 441,522		$ (25,294)	$ (22,949)
Balance (in shares) at Mar. 31, 2022				71,424