Intangible Assets (Summary Of Gross Goodwill And Accumulated Impairment Losses And Write-Offs Detailed By Reportable Segments) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended			12 Months Ended
	Jun. 30, 2011	Sep. 30, 2012	Sep. 30, 2011		Dec. 31, 2011	Dec. 31, 2010
Indefinite-lived Intangible Assets by Segment [Line Items]
Gross goodwill		$ 334,237	$ 333,654		$ 333,654	$ 333,654
Accumulated impairments		(114,123)	(114,123)		(114,123)	(104,023)
Accumulated divestiture related write-offs		(85,872)	(85,872)		(85,872)	(67,451)
Goodwill		134,242	133,659		133,659	162,180
Additions		583	0
Impairments		0	(10,100)	[1],[2]
Divestitures	16,400	0	(18,421)	[2]
Net change in goodwill		583	(28,521)
Non Strategic [Member]
Indefinite-lived Intangible Assets by Segment [Line Items]
Gross goodwill		199,995	199,995		199,995	199,995
Accumulated impairments		(114,123)	(114,123)		(114,123)	(104,023)
Accumulated divestiture related write-offs		(85,872)	(85,872)		(85,872)	(67,451)
Goodwill		0	0		0	28,521
Additions		0	0
Impairments		0	(10,100)
Divestitures		0	(18,421)
Net change in goodwill		0	(28,521)
Regional Banking [Member]
Indefinite-lived Intangible Assets by Segment [Line Items]
Gross goodwill		36,238	36,238		36,238	36,238
Accumulated impairments		0	0		0	0
Accumulated divestiture related write-offs		0	0		0	0
Goodwill		36,238	36,238		36,238	36,238
Additions		0	0
Impairments		0	0
Divestitures		0	0
Net change in goodwill		0	0
Capital Markets [Member]
Indefinite-lived Intangible Assets by Segment [Line Items]
Gross goodwill		98,004	97,421		97,421	97,421
Accumulated impairments		0	0		0	0
Accumulated divestiture related write-offs		0	0		0	0
Goodwill		98,004	97,421		97,421	97,421
Additions		583	0
Impairments		0	0
Divestitures		0	0
Net change in goodwill		$ 583	$ 0

[1] See Note 16 – Restructuring, Repositioning, and Efficiency for further details related to goodwill impairments.

[2] See Note 2 – Acquisitions and Divestitures for further details regarding goodwill related to divestitures.