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Earnings Per Share - Calculation of Basic Earnings Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020
Earnings Per Share [Abstract]
Net income	$ 5,920	$ 4,983	$ 4,909	$ 4,410	$ 4,804	$ 4,105	$ 15,812	$ 13,319
Less: distributed earnings allocated to participating securities	(20)			(15)			(49)	(41)
Less: undistributed earnings allocated to participating securities	(31)			(19)			(77)	(59)
Net earnings available to common shareholders	$ 5,869			$ 4,376			$ 15,686	$ 13,219
Weighted average common shares outstanding including participating securities	11,209,732			11,142,797			11,199,309	11,135,695
Less: average unvested restricted shares	(96,197)			(83,257)			(89,075)	(83,445)
Weighted average common shares outstanding	11,113,535			11,059,540			11,110,234	11,052,250
Basic and diluted earnings per share	$ 0.53			$ 0.40			$ 1.41	$ 1.20

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