Earnings per Share ("EPS") ( Earnings per Share Basic and Diluted) (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Earnings Per Share [Abstract]
Net Income Applicable To Common Shareholders	$ 44,291	$ 36,732	$ 132,338	$ 97,998
Weighted Average Common Shares Outstanding	187,096	186,214	186,840	181,735
Basic Earnings Per Common Share	$ 0.24	$ 0.20	$ 0.71	$ 0.54
Net Income Available To Common Shareholders	$ 44,291	$ 36,732	$ 132,338	$ 97,998
Weighted Average Common Shares Outstanding	187,096	186,214	186,840	181,735
Dilutive Potential Common Shares	1,013	790	976	752
Total Diluted Average Common Shares Outstanding	188,109	187,004	187,816	182,487
Diluted Earnings Per Common Share	$ 0.24	$ 0.20	$ 0.70	$ 0.54
Antidilutive Potential Common Stock Equivalents/Options	1,455	1,929	1,494	2,039