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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, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Basic earnings per share
Net income	$ 16,642	$ 14,115	$ 27,458	$ 26,919
Weighted average common shares outstanding	45,055,117	38,347,612	41,956,047	38,327,118
Basic Earnings Per Share	$ 0.37	$ 0.37	$ 0.65	$ 0.70
Diluted earnings per share
Net income available to common shareholders	$ 16,642	$ 14,115	$ 27,458	$ 26,919
Weighted average common shares outstanding	45,055,117	38,347,612	41,956,047	38,327,118
Effect of dilutive securities:
Weighted average common shares outstanding	45,130,408	38,519,401	42,032,971	38,484,321
Diluted Earnings Per Share	$ 0.37	$ 0.37	$ 0.65	$ 0.70
Restricted Stock [Member]
Effect of dilutive securities:
Effect of dilutive securities		47,307		37,383
Stock Options [Member]
Effect of dilutive securities:
Effect of dilutive securities	75,291	124,482	76,924	119,820

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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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