Earnings Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2021	Sep. 30, 2020
Earnings Per Share [Abstract]
Net Income (Loss)	$ (6,190)	$ 1,601	$ 2,224	$ 2,273	$ (3,503)	$ 1,454	$ 1,908	$ 785	$ (92)	$ 644
Weighted average shares outstanding									7,616,151	7,690,675
Average unearned ESOP shares									(78,743)	(93,147)
Basic weighted average shares outstanding	7,548,958	7,545,371	7,529,408	7,525,808	7,522,199	7,538,375	7,663,771	7,665,842	7,537,408	7,597,528
Plus: effect of dilutive options and restricted stock									708	198
Diluted weighted average common shares outstanding	7,550,766	7,546,200	7,530,151	7,526,376	7,522,360	7,538,375	7,663,771	7,665,842	7,538,116	7,597,726
Earnings (loss) per share:
Basic	$ (0.82)	$ 0.21	$ 0.30	$ 0.30	$ 0.46	$ 0.19	$ 0.25	$ 0.10	$ 0.01	$ 0.08
Diluted	$ (0.82)	$ 0.21	$ 0.30	$ 0.30	$ 0.46	$ 0.19	$ 0.25	$ 0.10	$ 0.01	$ 0.08