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Earnings per Share - Computation of Diluted EPS (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Earnings Per Share [Abstract]
Net income	$ 2,025	$ 2,998	$ 2,969	$ 1,869	$ 2,274	$ 1,949	$ 5,958	$ 964	$ 9,861	$ 11,145	$ 6,691
Diluted weighted-average shares outstanding									11,950	11,232	11,161
Diluted EPS	$ 0.17	$ 0.25	$ 0.25	$ 0.16	$ 0.20	$ 0.17	$ 0.53	$ 0.09	$ 0.83	$ 0.99	$ 0.60

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