Intangible Assets (Summary Of Gross Goodwill And Accumulated Impairment Losses And Write-Offs Detailed By Reportable Segments) (Details) (USD $)	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013	Dec. 31, 2012
Goodwill [Line Items]
Gross goodwill	$ 341,938,000	$ 340,474,000	$ 341,938,000	$ 334,237,000
Accumulated impairments	(114,123,000)	(114,123,000)	(114,123,000)	(114,123,000)
Accumulated divestiture related write-offs	(85,872,000)	(85,872,000)	(85,872,000)	(85,872,000)
Goodwill	141,943,000	140,479,000	141,943,000	134,242,000
Additions	0	6,237,000
Impairments	0	0
Divestitures	0	0
Net change in goodwill	0	6,237,000
Non Strategic [Member]
Goodwill [Line Items]
Gross goodwill	199,995,000	199,995,000	199,995,000	199,995,000
Accumulated impairments	(114,123,000)	(114,123,000)	(114,123,000)	(114,123,000)
Accumulated divestiture related write-offs	(85,872,000)	(85,872,000)	(85,872,000)	(85,872,000)
Goodwill	0	0	0	0
Additions	0	0
Impairments	0	0
Divestitures	0	0
Net change in goodwill	0	0
Regional Banking [Member]
Goodwill [Line Items]
Gross goodwill	43,939,000	42,475,000	43,939,000	36,238,000
Accumulated impairments	0	0	0	0
Accumulated divestiture related write-offs	0	0	0	0
Goodwill	43,939,000	42,475,000	43,939,000	36,238,000
Additions	0	6,237,000
Impairments	0	0
Divestitures	0	0
Net change in goodwill	0	6,237,000
Capital Markets [Member]
Goodwill [Line Items]
Gross goodwill	98,004,000	98,004,000	98,004,000	98,004,000
Accumulated impairments	0	0	0	0
Accumulated divestiture related write-offs	0	0	0	0
Goodwill	98,004,000	98,004,000	98,004,000	98,004,000
Additions	0	0
Impairments	0	0
Divestitures	0	0
Net change in goodwill	$ 0	$ 0