Loans (Schedule Of Loans By Portfolio Segment) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012		Jun. 30, 2012	Dec. 31, 2011		Sep. 30, 2011		Jun. 30, 2011	Dec. 31, 2010
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	$ 16,523,783	[1],[2]		$ 16,397,127		$ 16,241,402	[1],[2]
Allowance for loan losses	281,744	[1],[2]	321,051	384,351		449,645	[1],[2]	524,091	664,799
Total net loans	16,242,039			16,012,776		15,791,757
Commercial Financial And Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	8,466,450					7,705,749
Consumer Real Estate Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	5,735,904					5,928,310
Permanent Mortgage Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	805,511	[3]				880,459	[4]
Credit Card And Other Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	286,063					298,544
Commercial Portfolio Segment [Member] | Commercial Financial And Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	8,466,450			8,014,927		7,705,749
Commercial Portfolio Segment [Member] | Income C R E [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	1,160,866			1,257,497		1,286,683
Commercial Portfolio Segment [Member] | Residential C R E [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	68,989			120,913		141,657
Retail [Member] | Consumer Real Estate Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	5,318,898			5,291,364		5,305,005
Retail [Member] | Permanent Mortgage Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	791,271			787,597		838,020
Retail [Member] | Credit Card And Other Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	286,063			284,051		298,544
Retail [Member] | Restricted Real Estate Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	431,246	[5]		640,778	[5]	665,744	[5]
Restricted Consumer Real Estate Loans And Secured Borrowings [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	417,000			600,200		623,300
Allowance for loan losses	14,700
Restricted Permanent Mortgage Real Estate Loans And Secured Borrowings [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	14,200			40,600		42,400
Allowance for loan losses	$ 600					$ 5,500

[1] Balances as of September 30, 2012 and 2011 include $14.7 million and $26.9 million of reserves, respectively, and $417.0 million and $623.3 million of balances in restricted consumer real estate loans and secured borrowings, respectively.

[2] Balances as of September 30, 2012 and 2011 include $.6 million and $5.5 million of reserves, respectively, and $14.2 million and $42.4 million of balances in restricted permanent mortgage loans and secured borrowings, respectively.

[3] Includes restricted real estate loans and secured borrowings.

[4] Includes restricted real estate loans and secured borrowings

[5] Balances as of September 30, 2012 and 2011, and December 31, 2011, include $417.0 million, $623.3 million, and $600.2 million of consumer real estate loans and $14.2 million, $42.4 million, and $40.6 million of permanent mortgage loans, respectively.