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Earnings per Share - Computation of Basic 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
Basic weighted-average shares outstanding									11,292	11,029	10,950
Basic EPS	$ 0.18	$ 0.26	$ 0.26	$ 0.17	$ 0.21	$ 0.18	$ 0.54	$ 0.09	$ 0.87	$ 1.01	$ 0.61

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