Loans (Schedule Of Loans By Portfolio Segment) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013		Mar. 31, 2013	Dec. 31, 2012		Jun. 30, 2012		Mar. 31, 2012	Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	$ 16,197,046			$ 16,708,582		$ 16,185,763
Allowance for loan losses	261,934		265,218	276,963		321,051		346,016	384,351
Total net loans	15,935,112			16,431,619		15,864,712
Commercial Financial And Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	8,367,161					7,981,365
Consumer Real Estate Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	5,549,440					5,855,564
Permanent Mortgage Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	746,154					755,707
Credit Card And Other Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	316,085					278,958
Commercial Portfolio Segment [Member] | Commercial Financial And Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	8,367,161			8,796,956		7,981,365
Commercial Portfolio Segment [Member] | Income C R E [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	1,171,901			1,109,930		1,224,944
Commercial Portfolio Segment [Member] | Residential C R E [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	46,305			58,305		89,225
Retail [Member] | Consumer Real Estate Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	5,549,440	[1]		5,688,703	[1]	5,855,564	[1]
Retail [Member] | Permanent Mortgage Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	746,154	[2]		765,583	[2]	755,707	[2]
Retail [Member] | Credit Card And Other Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	316,085			289,105		278,958
Restricted Consumer Real Estate Loans And Secured Borrowings [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	367,000			402,400		447,500
Restricted Permanent Mortgage Real Estate Loans And Secured Borrowings [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	$ 12,400			$ 13,200		$ 16,900

[1] Balances as of June 30, 2013 and 2012, and December 31, 2012 include $367.0 million, $447.5 million and $402.4 million of restricted and secured real estate loans, respectively. See Note 13 - Variable Interest Entities for additional information.

[2] Balances as of June 30, 2013 and 2012, and December 31, 2012 include $12.4 million, $16.9 million and $13.2 million of restricted and secured real estate loans, respectively. See Note 13 - Variable Interest Entities for additional information.