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, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Earnings Per Share [Abstract]
Net Income Applicable To Common Shareholders	$ 43,494	$ 45,648	$ 80,656	$ 88,047
Average Common Shares Outstanding	187,637	186,812	187,547	186,710
Basic Earnings Per Common Share	$ 0.23	$ 0.24	$ 0.43	$ 0.47
Net Income Available To Common Shareholders	$ 43,494	$ 45,648	$ 80,656	$ 88,047
Average Common Shares Outstanding	187,637	186,812	187,547	186,710
Dilutive Potential Common Shares	658	911	749	902
Total Diluted Average Common Shares Outstanding	188,295	187,723	188,296	187,612
Diluted Earnings Per Common Share	$ 0.23	$ 0.24	$ 0.43	$ 0.47
Antidilutive Potential Common Stock Equivalents/Options	1,226	1,490	1,219	1,530