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Summary of Significant Accounting Policies (Earnings Per Share) (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Accounting Policies [Abstract]
Net income	$ 26,575	$ 22,906	$ 74,466	$ 65,235
Basic earnings per share:
Income available to common stockholders, basic	$ 26,575	$ 22,906	$ 74,466	$ 65,235
Weighted average common shares outstanding, basic (in shares)	64,454,684	63,728,393	64,327,640	63,545,065
Income available to common stockholders, per share amount, basic (usd per share)	$ 0.41	$ 0.36	$ 1.16	$ 1.03
Diluted earnings per share:
Income available to common stockholders, diluted	$ 26,575	$ 22,906	$ 74,466	$ 65,235
Dilutive shares (in shares)	190,594	206,493	192,070	182,658
Weighted average common shares outstanding, diluted (in shares)	64,645,278	63,934,886	64,519,710	63,727,723
Income available to common stockholders, per share amount, diluted (usd per share)	$ 0.41	$ 0.36	$ 1.15	$ 1.02

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