Loans (Schedule Of Loans By Portfolio Segment) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013		Jun. 30, 2013	Dec. 31, 2012		Sep. 30, 2012		Jun. 30, 2012	Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	$ 15,408,556			$ 16,708,582		$ 16,523,783
Allowance for loan losses	255,710		261,934	276,963		281,744		321,051	384,351
Total net loans	15,152,846			16,431,619		16,242,039
Commercial Financial And Industrial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	7,746,942			8,796,956		8,466,450
Allowance for loan losses	91,380		93,502	96,191		106,541		110,645	130,413
Commercial Real Estate Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	1,173,711			1,168,235		1,229,855
Allowance for loan losses	10,993		13,931	19,997		27,349		41,546	55,586
Consumer Real Estate Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	5,458,047	[1]		5,688,703	[1]	5,735,904	[1]
Allowance for loan losses	120,826		120,848	128,949		115,949		133,421	165,077
Permanent Mortgage Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	697,694	[2]		765,583	[2]	805,511	[2]
Allowance for loan losses	25,556		27,103	24,928		25,557		29,112	26,194
Credit Card And Other Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	332,162			289,105		286,063
Allowance for loan losses	6,955		6,550	6,898		6,348		6,327	7,081
Restricted Consumer Real Estate Loans And Secured Borrowings [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	349,300			402,400		417,000
Restricted Permanent Mortgage Real Estate Loans And Secured Borrowings [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	$ 11,700			$ 13,200		$ 14,200

[1] Balances as of September 30, 2013 and 2012, and December 31, 2012 include $349.3 million, $417.0 million and $402.4 million of restricted and secured real estate loans, respectively. See Note 14 - Variable Interest Entities for additional information.

[2] Balances as of September 30, 2013 and 2012, and December 31, 2012 include $11.7 million, $14.2 million and $13.2 million of restricted and secured real estate loans, respectively. See Note 14 - Variable Interest Entities for additional information.