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Computation of Earnings Per Share - Calculation of Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Numerator
Net income	$ 8,869	$ 10,481	$ 16,048	$ 14,179
Determination of shares
Weighted-average common shares outstanding	4,912	4,966	4,914	4,987
Dilutive effect - share-based awards	18	7	21	7
Diluted weighted-average common shares outstanding	4,930	4,973	4,935	4,994
Earnings per common share
Basic	$ 1.81	$ 2.11	$ 3.27	$ 2.84
Diluted	$ 1.80	$ 2.11	$ 3.25	$ 2.84

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