Loans (Period-End Balances And Various Asset Quality Attributes By Origination Vintage For The HELOC) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	$ 16,197,046	$ 16,708,582	$ 16,185,763
Home Equity [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
HELOC - Period End Balance	3,015,880		3,488,330
Avg orig FICO	740		740
Avg Refreshed FICO	730		730
Home Equity [Member] | Origination Vintage Period Pre2003 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
HELOC - Period End Balance	98,178		153,428
Avg orig FICO	712		721
Avg Refreshed FICO	702		715
Home Equity [Member] | Origination Vintage Period 2003 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
HELOC - Period End Balance	186,941		249,536
Avg orig FICO	730		733
Avg Refreshed FICO	719		724
Home Equity [Member] | Origination Vintage Period 2004 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
HELOC - Period End Balance	447,817		546,681
Avg orig FICO	727		728
Avg Refreshed FICO	718		719
Home Equity [Member] | Origination Vintage Period Two Thousand Five [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
HELOC - Period End Balance	572,954		679,687
Avg orig FICO	733		734
Avg Refreshed FICO	720		720
Home Equity [Member] | Origination Vintage Period Two Thousand Six [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
HELOC - Period End Balance	421,023		500,840
Avg orig FICO	740		741
Avg Refreshed FICO	726		726
Home Equity [Member] | Origination Vintage Period Two Thousand Seven [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
HELOC - Period End Balance	441,879		521,706
Avg orig FICO	744		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	240,776		279,200
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	126,901		163,683
Avg orig FICO	751		753
Avg Refreshed FICO	743		750
Home Equity [Member] | Origination Vintage Period 2010 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
HELOC - Period End Balance	128,058		159,522
Avg orig FICO	753		754
Avg Refreshed FICO	750		753
Home Equity [Member] | Origination Vintage Period 2011 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
HELOC - Period End Balance	124,889		155,018
Avg orig FICO	759		759
Avg Refreshed FICO	755		757
Home Equity [Member] | Origination Vintage Period 2012 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
HELOC - Period End Balance	153,692		79,029
Avg orig FICO	759		761
Avg Refreshed FICO	759		760
Home Equity [Member] | Origination Vintage Period 2013 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
HELOC - Period End Balance	$ 72,772
Avg orig FICO	760
Avg Refreshed FICO	759