Loans (Period-End Balances And Various Asset Quality Attributes By Origination Vintage For Permanent Mortgage Classes Of Loans) (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
Permanent Mortgage Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Permanent Mortgage - Period End Balance | $		$ 442,791,000		$ 511,708,000
Avg orig FICO		730		730
Avg Refreshed FICO		718		717
Loans, net of unearned income | $		$ 442,791,000	$ 454,123,000	$ 511,708,000
Permanent Mortgage Portfolio Segment [Member] | Origination Vintage Period Pre2004 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Permanent Mortgage - Period End Balance | $		$ 105,876,000		$ 136,848,000
Avg orig FICO		721		723
Avg Refreshed FICO		719		718
Permanent Mortgage Portfolio Segment [Member] | Origination Vintage Period 2004 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Permanent Mortgage - Period End Balance | $		$ 12,211,000		$ 16,484,000
Avg orig FICO		709		712
Avg Refreshed FICO		701		715
Permanent Mortgage Portfolio Segment [Member] | Origination Vintage Period 2005 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Permanent Mortgage - Period End Balance | $		$ 27,317,000		$ 32,563,000
Avg orig FICO		738		736
Avg Refreshed FICO		732		732
Permanent Mortgage Portfolio Segment [Member] | Origination Vintage Period 2006 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Permanent Mortgage - Period End Balance | $		$ 47,704,000		$ 59,636,000
Avg orig FICO		732		732
Avg Refreshed FICO		734		726
Permanent Mortgage Portfolio Segment [Member] | Origination Vintage Period 2007 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Permanent Mortgage - Period End Balance | $		$ 157,235,000		$ 183,359,000
Avg orig FICO		733		733
Avg Refreshed FICO		713		719
Permanent Mortgage Portfolio Segment [Member] | Origination Vintage Period 2008 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Permanent Mortgage - Period End Balance | $		$ 74,962,000		$ 82,818,000
Avg orig FICO		741		741
Avg Refreshed FICO		717		712
Permanent Mortgage Portfolio Segment [Member] | Origination Vintage Period 2016 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Permanent Mortgage - Period End Balance | $		$ 17,486,000		$ 0
Avg orig FICO		721		0
Avg Refreshed FICO		721		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.