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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								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Numerator
Net income	$ 5,624	$ 7,951	$ 7,904	$ 1,824	$ 5,264	$ 9,054	$ 6,735	$ 5,528	$ 23,303	$ 26,581	$ 12,654
Determination of shares (in thousands)
Weighted-average common shares outstanding									5,031	5,032	5,102
Dilutive effect - share-based awards									56	75	31
Diluted weighted-average common shares outstanding									5,087	5,107	5,133
Earnings per common share
Basic	$ 1.12	$ 1.58	$ 1.57	$ 0.36	$ 1.05	$ 1.80	$ 1.34	$ 1.10	$ 4.63	$ 5.28	$ 2.48
Diluted	$ 1.09	$ 1.55	$ 1.56	$ 0.36	$ 1.02	$ 1.76	$ 1.33	$ 1.09	$ 4.58	$ 5.21	$ 2.47

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