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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
	Mar. 31, 2018	Mar. 31, 2017
Basic earnings per share
Net income	$ 12,804	$ 8,224
Weighted average common shares outstanding	25,537,597	22,175,526
Basic Earnings Per Share	$ 0.50	$ 0.37
Diluted earnings per share
Net income available to common shareholders	$ 12,804	$ 8,224
Weighted average common shares outstanding	25,537,597	22,175,526
Effect of dilutive securities:
Weighted average common shares outstanding	25,645,874	22,326,071
Diluted Earnings Per Share	$ 0.50	$ 0.37
Restricted Stock [Member]
Effect of dilutive securities:
Effect of dilutive securities	23,571	36,336
Stock Options [Member]
Effect of dilutive securities:
Effect of dilutive securities	84,706	114,209

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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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