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, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Earnings Per Share [Abstract]
Net Income Applicable To Common Shareholders	$ 33,468	$ 44,291	$ 114,124	$ 132,338
Average Common Shares Outstanding	184,985	187,096	186,683	186,840
Basic Earnings Per Common Share	$ 0.18	$ 0.24	$ 0.61	$ 0.71
Net Income Available To Common Shareholders	$ 33,468	$ 44,291	$ 114,124	$ 132,338
Average Common Shares Outstanding	184,985	187,096	186,683	186,840
Dilutive Potential Common Shares	739	1,013	762	976
Total Diluted Average Common Shares Outstanding	185,724	188,109	187,445	187,816
Diluted Earnings Per Common Share	$ 0.18	$ 0.24	$ 0.61	$ 0.70
Antidilutive Potential Common Stock Equivalents/Options	1,191	1,455	1,181	1,494