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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, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Basic earnings per share
Net income	$ 20,537	$ 13,065	$ 47,995	$ 39,984
Weighted average common shares outstanding	45,038,021	38,365,379	42,995,082	38,340,012
Basic Earnings Per Share	$ 0.46	$ 0.34	$ 1.12	$ 1.04
Diluted earnings per share
Net income available to common shareholders	$ 20,537	$ 13,065	$ 47,995	$ 39,984
Weighted average common shares outstanding	45,038,021	38,365,379	42,995,082	38,340,012
Effect of dilutive securities:
Weighted average common shares outstanding	45,113,730	38,534,970	43,070,095	38,503,403
Diluted Earnings Per Share	$ 0.46	$ 0.34	$ 1.11	$ 1.04
Restricted Stock [Member]
Effect of dilutive securities:
Effect of dilutive securities		47,603		43,926
Stock Options [Member]
Effect of dilutive securities:
Effect of dilutive securities	75,709	121,988	75,013	119,465

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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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