Earnings per Share ("EPS") ( Earnings per Share Basic and Diluted) (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Schedule Of Computation Of Basic And Diluted Earnings Per Common Share [Line Items]
Net Income Applicable To Common Shareholders	$ 45,648	$ 37,793	$ 88,047	$ 61,266
Weighted Average Common Shares Outstanding	186,812	187,616	186,710	179,471
Basic Earnings Per Common Share	$ 0.24	$ 0.20	$ 0.47	$ 0.34
Net Income Available To Common Shareholders	$ 45,648	$ 37,793	$ 88,047	$ 61,266
Weighted Average Common Shares Outstanding	186,812	187,616	186,710	179,471
Dilutive Potential Common Shares	911	685	902	685
Total Diluted Average Common Shares Outstanding	187,723	188,301	187,612	180,156
Diluted Earnings Per Common Share	$ 0.24	$ 0.20	$ 0.47	$ 0.34
Antidilutive Potential Common Stock Equivalents/Options	1,490	2,075	1,530	2,173