Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands	Total	Cumulative-effect adjustment due to the adoption of ASU 2016-13	Common Stock	Additional Paid In Capital	Retained Earnings	Retained Earnings Cumulative-effect adjustment due to the adoption of ASU 2016-13	Unearned ESOP Shares	Accumulated Other Comprehensive Income
Balance at beginning of period (in shares) at Jun. 30, 2020			17,021,357
Balance at beginning of period at Jun. 30, 2020	$ 408,263	$ (13,358)	$ 170	$ 169,648	$ 242,776	$ (13,358)	$ (6,348)	$ 2,017
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	23,083				23,083
Cash dividends declared on common stock	(3,734)				(3,734)
Shares repurchased (in shares)			(566,455)
Common stock repurchased	(11,723)		$ (6)	(11,717)
Forfeited restricted stock (in shares)			(6,575)
Retired stock (in shares)			(9,106)
Retired stock	$ (204)			(204)
Granted restricted stock (in shares)			43,260
Exercised stock options (in shares)	172,866		172,866
Exercised stock options	$ 2,490		$ 3	2,487
Share-based compensation expense	1,449			1,449
ESOP compensation expense	744			347			397
Other comprehensive income (loss)	(558)							(558)
Balance at end of period (in shares) at Mar. 31, 2021			16,655,347
Balance at end of period at Mar. 31, 2021	406,452		$ 167	162,010	248,767		(5,951)	1,459
Balance at beginning of period (in shares) at Dec. 31, 2020			16,791,027
Balance at beginning of period at Dec. 31, 2020	404,724		$ 168	166,352	242,182		(6,083)	2,105
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	7,869				7,869
Cash dividends declared on common stock	(1,284)				(1,284)
Shares repurchased (in shares)			(289,333)
Common stock repurchased	(6,544)		$ (3)	(6,541)
Retired stock (in shares)			(8,473)
Retired stock	(195)			(195)
Granted restricted stock (in shares)			43,260
Exercised stock options (in shares)			118,866
Exercised stock options	1,714		$ 2	1,712
Share-based compensation expense	489			489
ESOP compensation expense	325			193			132
Other comprehensive income (loss)	(646)							(646)
Balance at end of period (in shares) at Mar. 31, 2021			16,655,347
Balance at end of period at Mar. 31, 2021	$ 406,452		$ 167	162,010	248,767		(5,951)	1,459
Balance at beginning of period (in shares) at Jun. 30, 2021	16,636,483		16,636,483
Balance at beginning of period at Jun. 30, 2021	$ 396,519		$ 167	160,582	240,075		(5,819)	1,514
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	29,628				29,628
Cash dividends declared on common stock	(4,094)				(4,094)
Shares repurchased (in shares)			(1,095,763)
Common stock repurchased	(32,318)		$ (11)	(32,307)
Forfeited restricted stock (in shares)			(12,000)
Retired stock (in shares)			(11,335)
Retired stock	$ (345)			(345)
Granted restricted stock (in shares)			40,123
Stock issued for RSUs (in shares)			7,118
Exercised stock options (in shares)	413,636		413,636
Exercised stock options	$ 6,081		$ 4	6,077
Share-based compensation expense	1,407			1,407
ESOP compensation expense	1,164			767			397
Other comprehensive income (loss)	$ (2,911)							(2,911)
Balance at end of period (in shares) at Mar. 31, 2022	15,978,262		15,978,262
Balance at end of period at Mar. 31, 2022	$ 395,131		$ 160	136,181	265,609		(5,422)	(1,397)
Balance at beginning of period (in shares) at Dec. 31, 2021			16,303,461
Balance at beginning of period at Dec. 31, 2021	401,746		$ 163	147,552	258,986		(5,555)	600
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	8,023				8,023
Cash dividends declared on common stock	(1,400)				(1,400)
Shares repurchased (in shares)			(419,931)
Common stock repurchased	(12,915)		$ (4)	(12,911)
Forfeited restricted stock (in shares)			(2,600)
Retired stock (in shares)			(8,627)
Retired stock	(270)			(270)
Granted restricted stock (in shares)			40,123
Exercised stock options (in shares)			65,836
Exercised stock options	1,039		$ 1	1,038
Share-based compensation expense	507			507
ESOP compensation expense	398			265			133
Other comprehensive income (loss)	$ (1,997)							(1,997)
Balance at end of period (in shares) at Mar. 31, 2022	15,978,262		15,978,262
Balance at end of period at Mar. 31, 2022	$ 395,131		$ 160	$ 136,181	$ 265,609		$ (5,422)	$ (1,397)