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		12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013	Dec. 31, 2012
Goodwill [Line Items]
Gross goodwill	$ 341,938	$ 334,237	$ 341,938	$ 334,237
Accumulated impairments	(114,123)	(114,123)	(114,123)	(114,123)
Accumulated divestiture related write-offs	(85,872)	(85,872)	(85,872)	(85,872)
Goodwill	141,943	134,242	141,943	134,242
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	199,995	199,995	199,995
Accumulated impairments	(114,123)	(114,123)	(114,123)	(114,123)
Accumulated divestiture related write-offs	(85,872)	(85,872)	(85,872)	(85,872)
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	36,238	43,939	36,238
Accumulated impairments	0	0	0	0
Accumulated divestiture related write-offs	0	0	0	0
Goodwill	43,939	36,238	43,939	36,238
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	98,004	98,004	98,004
Accumulated impairments	0	0	0	0
Accumulated divestiture related write-offs	0	0	0	0
Goodwill	98,004	98,004	98,004	98,004
Additions	0	0
Impairments	0	0
Divestitures	0	0
Net change in goodwill	$ 0	$ 0