Loans (Schedule Of Loans By Portfolio Segment) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014		Jun. 30, 2014	Dec. 31, 2013		Sep. 30, 2013		Jun. 30, 2013	Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	$ 15,812,017			$ 15,389,074		$ 15,408,556
Allowance for loan losses	238,641		243,628	253,809		255,710		261,934	276,963
Total net loans	15,573,376			15,135,265		15,152,846
Commercial Financial And Industrial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	8,477,329			7,923,576		7,746,942
Allowance for loan losses	69,870		68,591	86,446		91,380		93,502	96,191
Commercial Real Estate Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	1,278,394			1,133,279		1,173,711
Allowance for loan losses	15,450		15,821	10,603		10,993		13,931	19,997
Consumer Real Estate Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	5,130,988	[1]		5,333,371	[1]	5,458,047	[1]
Allowance for loan losses	118,395		118,037	126,785		120,826		120,848	128,949
Permanent Mortgage Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	572,789			662,242	[2]	697,694	[2]
Allowance for loan losses	20,221		23,727	22,491		25,556		27,103	24,928
Credit Card And Other Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	352,517			336,606		332,162
Allowance for loan losses	14,705		17,452	7,484		6,955		6,550	6,898
Restricted And Secured Consumer Real Estate Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	81,100			333,800		349,300
Restricted And Secured Permanent Mortgage Real Estate Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income				$ 11,200		$ 11,700

[1] Balances as of September 30, 2014 and 2013, and December 31, 2013 include $81.1 million, $349.3 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 September 30, 2013, and December 31, 2013 include $11.7 million and $11.2 million of restricted and secured real estate loans, respectively. See Note 14 - Variable Interest Entities for additional information.