Loans (Period-End Balances And Various Asset Quality Attributes By Origination Vintage For Permanent Mortgage Classes Of Loans) (Details) (USD $)	Sep. 30, 2014	Dec. 31, 2013		Sep. 30, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	$ 15,812,017,000	$ 15,389,074,000		$ 15,408,556,000
Permanent Mortgage Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Permanent Mortgage - Period End Balance	572,789,000			697,694,000
Avg orig FICO	730			731
Avg Refreshed FICO	731			713
Loans, net of unearned income	572,789,000	662,242,000	[1]	697,694,000	[1]
Permanent Mortgage Portfolio Segment [Member] | Origination Vintage Period Pre2004 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Permanent Mortgage - Period End Balance	161,037,000			205,111,000
Avg orig FICO	724			725
Avg Refreshed FICO	723			725
Permanent Mortgage Portfolio Segment [Member] | Origination Vintage Period 2004 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Permanent Mortgage - Period End Balance	18,190,000			24,595,000
Avg orig FICO	713			712
Avg Refreshed FICO	713			693
Permanent Mortgage Portfolio Segment [Member] | Origination Vintage Period 2005 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Permanent Mortgage - Period End Balance	35,503,000			41,643,000
Avg orig FICO	737			738
Avg Refreshed FICO	733			712
Permanent Mortgage Portfolio Segment [Member] | Origination Vintage Period 2006 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Permanent Mortgage - Period End Balance	65,722,000			81,932,000
Avg orig FICO	731			731
Avg Refreshed FICO	734			711
Permanent Mortgage Portfolio Segment [Member] | Origination Vintage Period 2007 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Permanent Mortgage - Period End Balance	201,640,000			236,819,000
Avg orig FICO	734			733
Avg Refreshed FICO	735			710
Permanent Mortgage Portfolio Segment [Member] | Origination Vintage Period 2008 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Permanent Mortgage - Period End Balance	$ 90,697,000			$ 107,594,000
Avg orig FICO	742			741
Avg Refreshed FICO	736			714

[1] Balances as of September 30, 2013, and December 31, 2013 include $11.7 million and $11.2 million of restricted and secured real estate loans, respectively. See Note 14 - Variable Interest Entities for additional information.