Loans (Period-End Balances And Various Asset Quality Attributes By Origination Vintage For The HELOC) (Details)		Mar. 31, 2016 USD ($) number	Dec. 31, 2015 USD ($)	Mar. 31, 2015 USD ($) number
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income | $	[1]	$ 17,574,994,000	$ 17,686,502,000	$ 16,732,123,000
Home Equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
HELOC - Period End Balance | $		$ 1,989,080,000		$ 2,364,810,000
Avg orig FICO		743		742
Avg Refreshed FICO		734		732
Loans, net of unearned income | $		$ 1,989,080,000		$ 2,364,810,000
Home Equity | Origination Vintage Period Pre 2003
Accounts, Notes, Loans and Financing Receivable [Line Items]
HELOC - Period End Balance | $		$ 35,875,000		$ 51,626,000
Avg orig FICO		708		707
Avg Refreshed FICO		704		700
Home Equity | Origination Vintage Period 2003
Accounts, Notes, Loans and Financing Receivable [Line Items]
HELOC - Period End Balance | $		$ 67,315,000		$ 95,043,000
Avg orig FICO		718		721
Avg Refreshed FICO		711		707
Home Equity | Origination Vintage Period 2004
Accounts, Notes, Loans and Financing Receivable [Line Items]
HELOC - Period End Balance | $		$ 184,785,000		$ 258,974,000
Avg orig FICO		721		723
Avg Refreshed FICO		710		707
Home Equity | Origination Vintage Period 2005
Accounts, Notes, Loans and Financing Receivable [Line Items]
HELOC - Period End Balance | $		$ 276,596,000		$ 421,315,000
Avg orig FICO		728		731
Avg Refreshed FICO		711		720
Home Equity | Origination Vintage Period 2006
Accounts, Notes, Loans and Financing Receivable [Line Items]
HELOC - Period End Balance | $		$ 246,861,000		$ 321,702,000
Avg orig FICO		737		739
Avg Refreshed FICO		725		726
Home Equity | Origination Vintage Period 2007
Accounts, Notes, Loans and Financing Receivable [Line Items]
HELOC - Period End Balance | $		$ 286,148,000		$ 342,531,000
Avg orig FICO		744		744
Avg Refreshed FICO		730		728
Home Equity | Origination Vintage Period 2008
Accounts, Notes, Loans and Financing Receivable [Line Items]
HELOC - Period End Balance | $		$ 164,166,000		$ 188,111,000
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 | $		$ 80,993,000		$ 97,279,000
Avg orig FICO		751		751
Avg Refreshed FICO		745		742
Home Equity | Origination Vintage Period 2010
Accounts, Notes, Loans and Financing Receivable [Line Items]
HELOC - Period End Balance | $		$ 76,987,000		$ 92,777,000
Avg orig FICO		753		753
Avg Refreshed FICO		746		749
Home Equity | Origination Vintage Period 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]
HELOC - Period End Balance | $		$ 74,531,000		$ 92,484,000
Avg orig FICO		759		758
Avg Refreshed FICO		750		753
Home Equity | Origination Vintage Period 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
HELOC - Period End Balance | $		$ 91,976,000		$ 112,955,000
Avg orig FICO		759		760
Avg Refreshed FICO		758		758
Home Equity | Origination Vintage Period 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]
HELOC - Period End Balance | $		$ 117,405,000		$ 142,772,000
Avg orig FICO		756		757
Avg Refreshed FICO		756		756
Home Equity | Origination Vintage Period 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
HELOC - Period End Balance | $		$ 107,725,000		$ 121,991,000
Avg orig FICO		761		762
Avg Refreshed FICO		763		763
Home Equity | Origination Vintage Period 2015 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
HELOC - Period End Balance | $		$ 151,444,000		$ 25,250,000
Avg orig FICO		761		759
Avg Refreshed FICO		760		756
Home Equity | Origination Vintage Period 2016 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
HELOC - Period End Balance | $		$ 26,273,000		$ 0
Avg orig FICO		764		0
Avg Refreshed FICO		760		0

[1] March 31, 2016 and 2015 and December 31, 2015 include $31.2 million , $28.0 million and $29.7 million, respectively, of held-to-maturity consumer mortgage loans secured by residential real estate properties in process of foreclosure.