Loans (Period-End Balances And Various Asset Quality Attributes By Origination Vintage For The HELOC) (Details) (USD $)	Mar. 31, 2015		Dec. 31, 2014	Mar. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	$ 16,732,123,000	[1]	$ 16,230,166,000	$ 15,119,461,000
Home Equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
HELOC - Period End Balance	2,364,810,000			2,747,817,000
Avg orig FICO	742			741
Avg Refreshed FICO	732			731
Loans, net of unearned income	2,364,810,000			2,747,817,000
Home Equity | Origination Vintage Period Pre 2003
Accounts, Notes, Loans and Financing Receivable [Line Items]
HELOC - Period End Balance	51,626,000			73,926,000
Avg orig FICO	707			710
Avg Refreshed FICO	700			703
Home Equity | Origination Vintage Period 2003
Accounts, Notes, Loans and Financing Receivable [Line Items]
HELOC - Period End Balance	95,043,000			130,144,000
Avg orig FICO	721			723
Avg Refreshed FICO	707			709
Home Equity | Origination Vintage Period 2004
Accounts, Notes, Loans and Financing Receivable [Line Items]
HELOC - Period End Balance	258,974,000			375,252,000
Avg orig FICO	723			726
Avg Refreshed FICO	707			715
Home Equity | Origination Vintage Period 2005
Accounts, Notes, Loans and Financing Receivable [Line Items]
HELOC - Period End Balance	421,315,000			517,957,000
Avg orig FICO	731			732
Avg Refreshed FICO	720			721
Home Equity | Origination Vintage Period 2006
Accounts, Notes, Loans and Financing Receivable [Line Items]
HELOC - Period End Balance	321,702,000			375,022,000
Avg orig FICO	739			740
Avg Refreshed FICO	726			727
Home Equity | Origination Vintage Period 2007
Accounts, Notes, Loans and Financing Receivable [Line Items]
HELOC - Period End Balance	342,531,000			396,409,000
Avg orig FICO	744			743
Avg Refreshed FICO	728			728
Home Equity | Origination Vintage Period 2008
Accounts, Notes, Loans and Financing Receivable [Line Items]
HELOC - Period End Balance	188,111,000			217,360,000
Avg orig FICO	753			753
Avg Refreshed FICO	748			748
Home Equity | Origination Vintage Period 2009
Accounts, Notes, Loans and Financing Receivable [Line Items]
HELOC - Period End Balance	97,279,000			113,703,000
Avg orig FICO	751			751
Avg Refreshed FICO	742			746
Home Equity | Origination Vintage Period 2010
Accounts, Notes, Loans and Financing Receivable [Line Items]
HELOC - Period End Balance	92,777,000			110,958,000
Avg orig FICO	753			753
Avg Refreshed FICO	749			748
Home Equity | Origination Vintage Period 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]
HELOC - Period End Balance	92,484,000			110,815,000
Avg orig FICO	758			758
Avg Refreshed FICO	753			754
Home Equity | Origination Vintage Period 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
HELOC - Period End Balance	112,955,000			133,618,000
Avg orig FICO	760			759
Avg Refreshed FICO	758			759
Home Equity | Origination Vintage Period 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]
HELOC - Period End Balance	142,772,000			169,429,000
Avg orig FICO	757			760
Avg Refreshed FICO	756			757
Home Equity | Origination Vintage Period 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
HELOC - Period End Balance	121,991,000			23,224,000
Avg orig FICO	762			756
Avg Refreshed FICO	763			755
Home Equity | Origination Vintage Period 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
HELOC - Period End Balance	$ 25,250,000			$ 0
Avg orig FICO	759			0
Avg Refreshed FICO	756			0

[1] (b) March 31, 2015 includes $28.0 million of held-to-maturity consumer mortgage loans secured by residential real estate properties in process of foreclosure.