Goodwill And Other Intangible Assets (Goodwill and Other Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008
Impairment			$ (111,952)
Amortization	(4,948)	(5,389)	(6,165)
Community Banking [Member]
Goodwill, Gross	765,316	765,113	719,255	719,336
Goodwill, Impaired, Accumulated Impairment Loss	(111,952)	(111,952)	(111,952)
Goodwill	653,364	653,161	607,303	719,336
Net additions	247	45,954
Reductions	(44)	(96)	(81)
Impairment			(111,952)
Wealth Management [Member]
Goodwill, Gross	3,697	3,697	3,697	3,697
Goodwill, Impaired, Accumulated Impairment Loss	(982)	(982)	(982)	(982)
Goodwill	2,715	2,715	2,715	2,715
Other Intagible Assets [Member]
Reductions		(5,150)
Impairment			(804)
Amortization	(4,948)	(5,389)	(5,361)
Finite-Lived Intangible Assets, Gross	58,079	58,079	56,213	56,213
Other intangible net additions		7,016
Finite-Lived Intangible Assets, Accumulated Amortization	(36,934)	(31,986)	(26,597)	(20,432)
Finite-Lived Intangible Assets, Net	$ 21,145	$ 26,093	$ 29,616	$ 35,781