Loans (Period-End Balances And Various Asset Quality Attributes By Origination Vintage For Permanent Mortgage Classes Of Loans) (Details)	Sep. 30, 2015 USD ($) number		Dec. 31, 2014 USD ($)	Sep. 30, 2014 USD ($) number
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income | $	$ 16,725,492,000	[1]	$ 16,230,166,000	$ 15,812,017,000
Permanent Mortgage Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Permanent Mortgage - Period End Balance | $	$ 463,893,000			$ 572,789,000
Avg orig FICO	730			730
Avg Refreshed FICO	716			731
Loans, net of unearned income | $	$ 463,893,000		$ 538,961,000	$ 572,789,000
Permanent Mortgage Portfolio Segment [Member] | Origination Vintage Period Pre2004 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Permanent Mortgage - Period End Balance | $	$ 120,411,000			$ 161,037,000
Avg orig FICO	722			724
Avg Refreshed FICO	718			723
Permanent Mortgage Portfolio Segment [Member] | Origination Vintage Period 2004 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Permanent Mortgage - Period End Balance | $	$ 14,003,000			$ 18,190,000
Avg orig FICO	711			713
Avg Refreshed FICO	709			713
Permanent Mortgage Portfolio Segment [Member] | Origination Vintage Period 2005 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Permanent Mortgage - Period End Balance | $	$ 30,637,000			$ 35,503,000
Avg orig FICO	736			737
Avg Refreshed FICO	733			733
Permanent Mortgage Portfolio Segment [Member] | Origination Vintage Period 2006 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Permanent Mortgage - Period End Balance | $	$ 49,011,000			$ 65,722,000
Avg orig FICO	732			731
Avg Refreshed FICO	722			734
Permanent Mortgage Portfolio Segment [Member] | Origination Vintage Period 2007 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Permanent Mortgage - Period End Balance | $	$ 168,663,000			$ 201,640,000
Avg orig FICO	734			734
Avg Refreshed FICO	713			735
Permanent Mortgage Portfolio Segment [Member] | Origination Vintage Period 2008 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Permanent Mortgage - Period End Balance | $	$ 81,168,000			$ 90,697,000
Avg orig FICO	741			742
Avg Refreshed FICO	712			736

[1] September 30, 2015 includes $30.7 million of held-to-maturity consumer mortgage loans secured by residential real estate in process of foreclosure.