Loans (Schedule Of Loans By Portfolio Segment) (Details) - USD ($) $ in Thousands		Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	[1]	$ 18,589,337		$ 17,686,502	$ 16,936,772
Allowance for loan losses		199,807	$ 204,034	210,242	221,351	$ 228,328	$ 232,448
Total net loans		18,389,530		17,476,260	16,715,421
Commercial Financial And Industrial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income		11,179,445		10,436,390	9,832,563
Allowance for loan losses		80,972	80,887	73,637	78,750	67,652	67,011
Commercial Real Estate Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income		1,969,412		1,674,935	1,400,715
Allowance for loan losses		30,264	25,626	25,159	21,492	17,665	18,574
Consumer Real Estate Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	[2]	4,640,779		4,766,518	4,870,271
Allowance for loan losses		59,081	67,321	80,614	85,457	109,245	113,011
Permanent Mortgage Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income		439,014		454,123	487,679
Allowance for loan losses		17,600	18,754	18,947	22,377	20,186	19,122
Credit Card And Other Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income		360,687		354,536	345,544
Allowance for loan losses		11,890	$ 11,446	11,885	13,275	$ 13,580	$ 14,730
Restricted And Secured Consumer Real Estate Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income		$ 43,500		$ 52,800	$ 66,400

[1] June 30 , 2016 and 2015 and December 31, 2015 include $31.1 million, $28.3 million and $29.7 million, respectively, of held-to-maturity consumer mortgage loans secured by residential real estate properties in process of f oreclosure.

[2] Balances as of June 3 0 , 2016 and 2015, and December 31, 2015, include $ 43.5 million, $ 66 . 4 million, and $ 52.8 million of restricted real estate loans, respectively. See Note 13 - Variable Interest Entities for additional information.