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Earnings Per Share - Calculation of Basic Earnings Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019
Earnings Per Share [Abstract]
Net income	$ 4,804	$ 4,105	$ 6,180	$ 3,224	$ 8,909	$ 9,404
Less: distributed earnings allocated to participating securities	(13)		(11)		(26)	(23)
Less: undistributed earnings allocated to participating securities	(22)		(33)		(40)	(45)
Net earnings available to common shareholders	$ 4,769		$ 6,136		$ 8,843	$ 9,336
Weighted average common shares outstanding including participating securities	11,129,341		11,106,367		11,132,105	11,098,149
Less: average unvested restricted shares	(80,062)		(77,304)		(82,397)	(80,343)
Weighted average common shares outstanding	11,049,279		11,029,063		11,049,708	11,017,806
Basic and diluted earnings per share	$ 0.43		$ 0.56		$ 0.80	$ 0.85

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