Loans (Period-End Balances And Various Asset Quality Attributes By Origination Vintage For Permanent Mortgage Classes Of Loans) (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
Permanent Mortgage Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Permanent Mortgage - Period End Balance	697,694				805,511
Avg orig FICO	731				732
Avg Refreshed FICO	713				712
Loans, net of unearned income	697,694	[1]	765,583	[1]	805,511	[1]
Permanent Mortgage Portfolio Segment [Member] | Origination Vintage Period Pre2004 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Permanent Mortgage - Period End Balance	205,111				220,499
Avg orig FICO	725				726
Avg Refreshed FICO	725				729
Permanent Mortgage Portfolio Segment [Member] | Origination Vintage Period 2004 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Permanent Mortgage - Period End Balance	24,595				31,422
Avg orig FICO	712				715
Avg Refreshed FICO	693				692
Permanent Mortgage Portfolio Segment [Member] | Origination Vintage Period 2005 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Permanent Mortgage - Period End Balance	41,643				52,058
Avg orig FICO	738				739
Avg Refreshed FICO	712				716
Permanent Mortgage Portfolio Segment [Member] | Origination Vintage Period 2006 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Permanent Mortgage - Period End Balance	81,932				94,898
Avg orig FICO	731				734
Avg Refreshed FICO	711				706
Permanent Mortgage Portfolio Segment [Member] | Origination Vintage Period 2007 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Permanent Mortgage - Period End Balance	236,819				275,594
Avg orig FICO	733				734
Avg Refreshed FICO	710				711
Permanent Mortgage Portfolio Segment [Member] | Origination Vintage Period 2008 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Permanent Mortgage - Period End Balance	$ 107,594				$ 131,040
Avg orig FICO	741				742
Avg Refreshed FICO	714				712

[1] Balances as of September 30, 2013 and 2012, and December 31, 2012 include $11.7 million, $14.2 million and $13.2 million of restricted and secured real estate loans, respectively. See Note 14 - Variable Interest Entities for additional information.