Loans (Schedule Of Loans By Portfolio Segment) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012		Dec. 31, 2011		Mar. 31, 2011		Dec. 31, 2010
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	$ 15,971,330	[1],[2]	$ 16,397,127		$ 15,972,372	[1],[2]
Allowance for loan losses	346,016	[1],[2]	384,351		589,128	[1],[2]	664,799
Total net loans	15,625,314		16,012,776		15,383,244
Commercial, Financial, And Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	7,705,153				6,808,163
Consumer Real Estate Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	5,858,821				6,159,774
Permanent Mortgage Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	788,700	[3]			1,087,524	[3]
Credit Card & Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	271,730				298,057
Commercial [Member] | Commercial, Financial, And Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	7,705,153		8,014,927		6,808,163
Commercial [Member] | Income CRE [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	1,247,089		1,257,497		1,397,741
Commercial [Member] | Residential CRE [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	99,837		120,913		221,113
Retail [Member] | Consumer Real Estate Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	5,391,801		5,291,364		5,487,370
Retail [Member] | Permanent Mortgage Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	750,723		787,597		1,037,611
Retail [Member] | Credit Card & Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	271,730		284,051		298,057
Retail [Member] | Restricted Real Estate Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	504,997	[4]	640,778	[4]	722,317	[4]
Restricted Consumer Real Estate Loans And Secured Borrowings [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	467,000				672,400
Allowance for loan losses	20,100				36,500
Restricted Consumer Real Estate Loans And Secured Borrowings [Member] | Consumer Real Estate Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	467,000		600,200		672,400
Restricted Permanent Mortgage Real Estate Loans And Secured Borrowings [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	38,000				49,900
Allowance for loan losses	5,400				3,300
Restricted Permanent Mortgage Real Estate Loans And Secured Borrowings [Member] | Permanent Mortgage Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	$ 38,000		$ 40,600		$ 49,900

[1] Balances as of March 31, 2012 and 2011 include $20.1 million and $36.5 million of reserves, respectively, and $467.0 million and $672.4 million of balances in restricted consumer real estate loans and secured borrowings, respectively.

[2] Balances as of March 31, 2012 and 2011 include $5.4 million and $3.3 million of reserves, respectively, and $38.0 million and $49.9 million of balances in restricted permanent mortgage loans and secured borrowings, respectively.

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

[4] Balances as of March 31, 2012 and 2011, and December 31, 2011, include $467.0 million, $672.4 million, and $600.2 million of consumer real estate loans and $38.0 million, $49.9 million, and $40.6 million of permanent mortgage loans, respectively.