Earnings Per Share ("EPS") - Schedule of Earnings Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended						9 Months Ended
	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Mar. 31, 2022	Mar. 31, 2021
Earnings Per Share [Abstract]
Net income applicable to common stock	$ 3,474	$ 4,288	$ 3,614	$ 3,592	$ 2,694	$ 2,728	$ 11,376	$ 9,014
Average number of common shares outstanding	15,122,502			15,684,763			15,228,422	16,022,046
Less: Average unallocated ESOP shares	(956,727)			(1,053,641)			(981,234)	(1,077,949)
Average number of common shares outstanding used to calculate basic earnings per common share	14,165,775			14,631,122			14,247,188	14,944,097
Effect of equity-based awards	31,941			1,220			53,962	567
Average number of common shares outstanding used to calculate diluted earnings per common share	14,197,716			14,632,342			14,301,150	14,944,664
Earnings per common share:
Basic	$ 0.25			$ 0.25			$ 0.80	$ 0.60
Diluted	$ 0.24			$ 0.25			$ 0.80	$ 0.60