Loans (Schedule Of Loans By Portfolio Segment) (Details) - USD ($) $ in Thousands		Sep. 30, 2016	Jun. 30, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	[1]	$ 19,555,787		$ 17,686,502	$ 16,725,492
Allowance for loan losses		201,557	$ 199,807	210,242	210,814	$ 221,351	$ 232,448
Total net loans		19,354,230		17,476,260	16,514,678
Commercial Financial And Industrial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income		12,118,298		10,436,390	9,610,295
Allowance for loan losses		86,866	80,972	73,637	71,463	78,750	67,011
Commercial Real Estate Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income		2,065,595		1,674,935	1,488,044
Allowance for loan losses		32,420	30,264	25,159	25,348	21,492	18,574
Consumer Real Estate Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	[2]	4,578,371		4,766,518	4,813,936
Allowance for loan losses		53,235	59,081	80,614	82,472	85,457	113,011
Permanent Mortgage Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income		436,100		454,123	463,893
Allowance for loan losses		16,589	17,600	18,947	20,076	22,377	19,122
Credit Card And Other Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income		357,423		354,536	349,324
Allowance for loan losses		12,447	$ 11,890	11,885	11,455	$ 13,275	$ 14,730
Restricted And Secured Consumer Real Estate Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income		$ 38,500		$ 52,800	$ 59,300

[1] September 30 , 2016 and 2015 and December 31, 2015 include $30.3 million, $30.7 million and $29.7 million, respectively, of held-to-maturity consumer mortgage loans secured by residential real estate properties in pr ocess of foreclosure.

[2] Balances as of September 3 0 , 2016 and 2015, and December 31, 2015, include $ 38.5 million, $ 59 . 3 million, and $ 52.8 million of restricted real estate loans, respectively. See Note 13 - Variable Interest Entities for additional information.