Intangible Assets (Summary Of Gross Goodwill And Accumulated Impairment Losses And Write-Offs Detailed By Reportable Segments) (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014	Dec. 31, 2013
Goodwill [Line Items]
Gross goodwill	$ 345,927,000	$ 341,938,000	$ 345,927,000	$ 341,938,000
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	145,932,000	141,943,000	145,932,000	141,943,000
Additions	0	0
Impairments	0	0
Divestitures	0	0
Net change in goodwill	0	0
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	47,928,000	43,939,000	47,928,000	43,939,000
Accumulated impairments	0	0	0	0
Accumulated divestiture related write-offs	0	0	0	0
Goodwill	47,928,000	43,939,000	47,928,000	43,939,000
Additions	0	0
Impairments	0	0
Divestitures	0	0
Net change in goodwill	0	0
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