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, 2019			17,984,105
Balance at beginning of period at Jun. 30, 2019	$ 408,896		$ 180	$ 190,315	$ 224,545		$ (6,877)	$ 733
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	8,804				8,804
Cash dividends declared on common stock, $0.07/common share	(1,034)				(1,034)
Shares repurchased (in shares)			(189,160)
Stock repurchased	$ (4,800)		$ (2)	(4,798)
Forfeited restricted stock (in shares)			(3,200)
Granted restricted stock (in shares)			13,000
Exercised stock options (in shares)	13,400		13,400
Exercised stock options	$ 194			194
Stock option expense	198			198
Restricted stock expense	245			245
ESOP shares allocated	338			205			133
Other comprehensive income	227							227
Balance at end of period (in shares) at Sep. 30, 2019			17,818,145
Balance at end of period at Sep. 30, 2019	413,068		$ 178	186,359	232,315		(6,744)	960
Balance at beginning of period (in shares) at Jun. 30, 2019			17,984,105
Balance at beginning of period at Jun. 30, 2019	$ 408,896		$ 180	190,315	224,545		(6,877)	733
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201613Member
Balance at end of period (in shares) at Jun. 30, 2020	17,021,357		17,021,357
Balance at end 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	$ 5,753				5,753
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201613Member
Cash dividends declared on common stock, $0.07/common share	$ (1,148)				(1,148)
Retired stock (in shares)			(633)
Retired stock	(9)			(9)
Stock option expense	164			164
Restricted stock expense	342			342
ESOP shares allocated	191			59			132
Other comprehensive income	$ 153							153
Balance at end of period (in shares) at Sep. 30, 2020	17,020,724		17,020,724
Balance at end of period at Sep. 30, 2020	$ 400,351		$ 170	$ 170,204	$ 234,023		$ (6,216)	$ 2,170