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Accounting Policies - Summary of Computation of Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Basic earnings per share
Net income	$ 13,065	$ 8,171	$ 39,984	$ 25,467
Weighted average common shares outstanding	38,365,379	33,870,240	38,340,012	33,489,681
Basic Earnings Per Share	$ 0.34	$ 0.24	$ 1.04	$ 0.76
Diluted earnings per share
Net income available to common shareholders	$ 13,065	$ 8,171	$ 39,984	$ 25,467
Weighted average common shares outstanding	38,365,379	33,870,240	38,340,012	33,489,681
Effect of dilutive securities:
Weighted average common shares outstanding	38,534,970	34,072,909	38,503,403	33,683,696
Diluted Earnings Per Share	$ 0.34	$ 0.24	$ 1.04	$ 0.75
Restricted Stock [Member]
Effect of dilutive securities:
Effect of dilutive securities	47,603	55,123	43,926	50,686
Stock Options [Member]
Effect of dilutive securities:
Effect of dilutive securities	121,988	147,546	119,465	143,329

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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