Goodwill And Other Intangible Assets (Goodwill Assets By Business Segment) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Goodwill [Roll Forward]
Beginning balance	$ 345,401	$ 307,295
Goodwill, Acquired	0
Goodwill, Impairment Loss	0
Ending balance	343,632	307,295
Goodwill, Translation and Purchase Accounting Adjustments	(1,769)
Community Banking [Member]
Goodwill [Roll Forward]
Beginning balance	274,963
Goodwill, Acquired	0
Goodwill, Impairment Loss	0
Ending balance	273,459
Goodwill, Translation and Purchase Accounting Adjustments	(1,504)
Specialty Finance [Member]
Goodwill [Roll Forward]
Beginning balance	38,574
Goodwill, Acquired	0
Goodwill, Impairment Loss	0
Ending balance	38,309
Goodwill, Translation and Purchase Accounting Adjustments	(265)
Wealth Management [Member]
Goodwill [Roll Forward]
Beginning balance	31,864
Goodwill, Acquired	0
Goodwill, Impairment Loss	0
Ending balance	31,864
Goodwill, Translation and Purchase Accounting Adjustments	$ 0