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Earnings Per Common Share - Basic and Diluted Earnings Per Common Share (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Earnings Per Share [Abstract]
Net income	$ 75,850	$ 77,381	$ 221,090	$ 205,273
Less: Preferred stock dividends	2,016	2,016	6,047	6,047
Net income available to common shareholders	73,834	75,365	215,043	199,226
Less: Earnings allocated to participating securities	260	285	744	758
Distributed earnings allocated to common stock	33,030	32,113	98,674	94,534
Undistributed earnings allocated to common stock	40,544	42,967	115,625	103,934
Net earnings allocated to common stock	$ 73,574	$ 75,080	$ 214,299	$ 198,468
Weighted-average shares outstanding for basic earnings per common share	62,628,725	62,939,149	62,945,595	61,738,831
Dilutive effect of stock compensation	690,041	933,479	736,197	913,774
Weighted-average shares outstanding for diluted earnings per common share	63,318,766	63,872,628	63,681,792	62,652,605

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Net Income Loss Available To Common Stock After Participating Securities Allocation

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The total amount of dividends declared in the period for each class of stock and the contractual amount of dividends (or interest on participating income bonds) that must be paid for the period (for example, unpaid cumulative dividends). Dividends declared in the current period do not include dividends declared in respect of prior-period unpaid cumulative dividends. Preferred dividends that are cumulative only if earned are deducted only to the extent that they are earned.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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