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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		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Basic earnings per share
Net income	$ 14,115	$ 9,072	$ 26,919	$ 17,296
Weighted average common shares outstanding	38,347,612	33,264,697	38,327,118	33,263,997
Basic Earnings Per Share	$ 0.37	$ 0.27	$ 0.70	$ 0.52
Diluted earnings per share
Net income available to common shareholders	$ 14,115	$ 9,072	$ 26,919	$ 17,296
Weighted average common shares outstanding	38,347,612	33,264,697	38,327,118	33,263,997
Effect of dilutive securities:
Weighted average common shares outstanding	38,519,401	33,483,584	38,484,321	33,486,779
Diluted Earnings Per Share	$ 0.37	$ 0.27	$ 0.70	$ 0.51
Restricted Stock [Member]
Effect of dilutive securities:
Effect of dilutive securities	47,307	45,136	37,383	49,807
Stock Options [Member]
Effect of dilutive securities:
Effect of dilutive securities	124,482	173,751	119,820	172,975

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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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