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Computation of Basic and Diluted EPS (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
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income available to common shareholders	$ 89,039	$ 99,147	$ 178,409	$ 197,492
Less: Dividends paid on and earnings allocated to participating securities	(1,055)	(1,267)	(2,177)	(2,524)
Earnings applicable to common stock	$ 87,984	$ 97,880	$ 176,232	$ 194,968
Weighted average common shares outstanding	465,351,586	488,530,527	465,422,251	488,336,395
Basic earnings per common share	$ 0.19	$ 0.20	$ 0.38	$ 0.40
Potential dilutive common shares	289,851	0	145,727	0
Total shares for diluted earnings per common share computation	465,641,437	488,530,527	465,567,978	488,336,395
Diluted earnings per common share and common share equivalents	$ 0.19	$ 0.20	$ 0.38	$ 0.40

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