Earnings Per Share ("EPS") - Factors Used in Earnings Per Common Share Computation (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Earnings Per Share [Abstract]
Net income	$ 1,331	$ 1,100
Basic weighted average shares outstanding	3,240,376	3,533,275
Less: Average unallocated ESOP shares	(209,289)	(228,534)
Basic average shares outstanding	3,031,087	3,304,741
Diluted effect of restricted stock awards and stock options	10,101	52,155
Diluted average shares outstanding	3,041,188	3,356,896
Basic earnings per common share	$ 0.44	$ 0.33
Diluted earnings per common share	$ 0.44	$ 0.33