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Earnings Per Share - Calculation of Basic Earnings Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Earnings Per Share [Abstract]
Net income	$ 4,909	$ 4,105
Less: distributed earnings allocated to participating securities	(15)	(13)
Less: undistributed earnings allocated to participating securities	(23)	(18)
Net earnings available to common shareholders	$ 4,871	$ 4,074
Weighted average common shares outstanding including participating securities	11,197,012	11,134,870
Less: average unvested restricted shares	(86,595)	(84,732)
Weighted average common shares outstanding	11,110,417	11,050,138
Basic and diluted earnings per share	$ 0.44	$ 0.37

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