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Earnings Per Share - Calculation of Basic Earnings Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Earnings Per Share [Abstract]
Net income	$ 7,683	$ 5,920	$ 4,983	$ 4,909	$ 6,776	$ 4,410	$ 4,804	$ 4,105	$ 23,495	$ 20,095	$ 18,402
Less: distributed earnings allocated to participating securities									(70)	(57)	(51)
Less: undistributed earnings allocated to participating securities									(121)	(96)	(87)
Net earnings available to common shareholders									$ 23,304	$ 19,942	$ 18,264
Weighted average common shares outstanding including participating securities									11,664,852	11,146,270	11,113,810
Less: average unvested restricted shares									(94,634)	(84,879)	(83,369)
Weighted average common shares outstanding	13,046,299	11,209,732	11,191,043	11,197,012	11,177,765	11,142,797	11,129,341	11,134,870	11,570,218	11,061,391	11,030,441
Basic and diluted earnings per share	$ 0.59	$ 0.53	$ 0.44	$ 0.44	$ 0.60	$ 0.40	$ 0.43	$ 0.37	$ 2.01	$ 1.80	$ 1.66

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