Loans (Period-End Balances And Various Asset Quality Attributes By Origination Vintage For The HELOC) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	$ 15,889,670	$ 16,708,582	$ 15,971,330
Home Equity [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
HELOC - Period End Balance	3,108,574		3,582,454
Avg orig FICO	740		740
Avg Refreshed FICO	729		729
Home Equity [Member] | Origination Vintage Period Pre2003 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
HELOC - Period End Balance	108,054		167,660
Avg orig FICO	714		722
Avg Refreshed FICO	705		715
Home Equity [Member] | Origination Vintage Period 2003 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
HELOC - Period End Balance	208,233		259,437
Avg orig FICO	732		733
Avg Refreshed FICO	723		724
Home Equity [Member] | Origination Vintage Period 2004 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
HELOC - Period End Balance	469,608		565,929
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	592,322		704,568
Avg orig FICO	734		734
Avg Refreshed FICO	719		720
Home Equity [Member] | Origination Vintage Period 2006 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
HELOC - Period End Balance	437,889		523,464
Avg orig FICO	740		741
Avg Refreshed FICO	725		724
Home Equity [Member] | Origination Vintage Period 2007 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
HELOC - Period End Balance	460,916		542,266
Avg orig FICO	745		746
Avg Refreshed FICO	728		731
Home Equity [Member] | Origination Vintage Period 2008 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
HELOC - Period End Balance	250,427		286,454
Avg orig FICO	754		755
Avg Refreshed FICO	747		749
Home Equity [Member] | Origination Vintage Period 2009 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
HELOC - Period End Balance	134,294		170,186
Avg orig FICO	752		754
Avg Refreshed FICO	745		751
Home Equity [Member] | Origination Vintage Period 2010 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
HELOC - Period End Balance	133,917		167,914
Avg orig FICO	753		755
Avg Refreshed FICO	749		755
Home Equity [Member] | Origination Vintage Period 2011 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
HELOC - Period End Balance	129,303		159,368
Avg orig FICO	759		760
Avg Refreshed FICO	756		757
Home Equity [Member] | Origination Vintage Period 2012 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
HELOC - Period End Balance	155,758		35,208
Avg orig FICO	760		762
Avg Refreshed FICO	758		758
Home Equity [Member] | Origination Vintage Period 2013 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
HELOC - Period End Balance	$ 27,853
Avg orig FICO	756
Avg Refreshed FICO	754