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Earnings Per Common Share - Basic and Diluted Earnings Per Common Share (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Earnings Per Share [Abstract]
Net income	$ 77,615	$ 60,444	$ 205,273	$ 175,295
Less: Preferred stock dividends	2,016	2,015	6,047	4,703
Net income available to common shareholders	75,599	58,429	199,226	170,592
Less: Earnings allocated to participating securities	286	214	758	621
Net earnings allocated to common stock	75,313	58,215	198,468	169,971
Distributed earnings allocated to common stock	32,113	30,202	94,534	88,935
Undistributed earnings allocated to common stock	43,200	28,013	103,934	81,036
Net earnings allocated to common stock	$ 75,313	$ 58,215	$ 198,468	$ 169,971
Weighted-average shares outstanding for basic earnings per common share	62,939,149	60,339,509	61,738,831	60,313,274
Dilutive effect of stock compensation	933,479	866,616	913,774	724,039
Weighted-average shares outstanding for diluted earnings per common share	63,872,628	61,206,125	62,652,605	61,037,313

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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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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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