Loans (Schedule Of Loans By Portfolio Segment) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014		Dec. 31, 2013		Mar. 31, 2013		Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	$ 15,119,461		$ 15,389,074		$ 15,889,670
Allowance for loan losses	247,246		253,809		265,218		276,963
Total net loans	14,872,215		15,135,265		15,624,452
Commercial Financial And Industrial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	7,752,995		7,923,576		8,091,186
Allowance for loan losses	72,732		86,446		86,105		96,191
Commercial Real Estate Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	1,152,418		1,133,279		1,115,879
Allowance for loan losses	15,523		10,603		15,138		19,997
Consumer Real Estate Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	5,258,014	[1]	5,333,371	[1]	5,590,180	[1]
Allowance for loan losses	123,409		126,785		131,417		128,949
Permanent Mortgage Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	622,242	[2]	662,242	[2]	793,282	[2]
Allowance for loan losses	22,521		22,491		25,448		24,928
Credit Card And Other Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	333,792		336,606		299,143
Allowance for loan losses	13,061		7,484		7,110		6,898
Restricted And Secured Consumer Real Estate Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	86,700		333,800		386,400
Restricted And Secured Permanent Mortgage Real Estate Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income			$ 11,200		$ 13,000

[1] Balances as of March 31, 2014 and 2013, and December 31, 2013 include $86.7 million, $386.4 million, and $333.8 million of restricted and secured real estate loans, respectively. See Note 14 - Variable Interest Entities for additional information.

[2] Balances as of March 31, 2013, and December 31, 2013 include $13.0 million and $11.2 million of restricted and secured real estate loans, respectively. See Note 14 - Variable Interest Entities for additional information.