Loans (Period-End Balances And Various Asset Quality Attributes By Origination Vintage For The HELOC) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	$ 15,408,556	$ 16,708,582	$ 16,523,783
Home Equity [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
HELOC - Period End Balance	2,896,532		3,335,635
Avg orig FICO	741		740
Avg Refreshed FICO	730		731
Loans, net of unearned income	2,896,532		3,335,635
Home Equity [Member] | Origination Vintage Period Pre2003 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
HELOC - Period End Balance	88,416		135,605
Avg orig FICO	711		718
Avg Refreshed FICO	702		710
Home Equity [Member] | Origination Vintage Period 2003 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
HELOC - Period End Balance	163,576		235,546
Avg orig FICO	728		733
Avg Refreshed FICO	714		724
Home Equity [Member] | Origination Vintage Period 2004 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
HELOC - Period End Balance	421,542		514,791
Avg orig FICO	727		728
Avg Refreshed FICO	717		718
Home Equity [Member] | Origination Vintage Period 2005 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
HELOC - Period End Balance	548,756		642,027
Avg orig FICO	733		734
Avg Refreshed FICO	720		719
Home Equity [Member] | Origination Vintage Period 2006 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
HELOC - Period End Balance	400,023		474,706
Avg orig FICO	741		741
Avg Refreshed FICO	725		726
Home Equity [Member] | Origination Vintage Period 2007 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
HELOC - Period End Balance	421,964		498,011
Avg orig FICO	744		745
Avg Refreshed FICO	728		729
Home Equity [Member] | Origination Vintage Period 2008 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
HELOC - Period End Balance	233,642		267,346
Avg orig FICO	754		755
Avg Refreshed FICO	747		748
Home Equity [Member] | Origination Vintage Period 2009 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
HELOC - Period End Balance	121,555		152,687
Avg orig FICO	750		753
Avg Refreshed FICO	744		748
Home Equity [Member] | Origination Vintage Period 2010 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
HELOC - Period End Balance	120,022		150,243
Avg orig FICO	753		754
Avg Refreshed FICO	750		752
Home Equity [Member] | Origination Vintage Period 2011 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
HELOC - Period End Balance	119,553		146,768
Avg orig FICO	758		759
Avg Refreshed FICO	754		758
Home Equity [Member] | Origination Vintage Period 2012 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
HELOC - Period End Balance	145,507		117,905
Avg orig FICO	759		761
Avg Refreshed FICO	759		759
Home Equity [Member] | Origination Vintage Period 2013 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
HELOC - Period End Balance	$ 111,976
Avg orig FICO	762
Avg Refreshed FICO	761