Allowance For Loan Losses (Rollforward Of The Allowance For Loan Losses By Portfolio Segment) (Details) - USD ($)		3 Months Ended
		Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning Balance		$ 210,242,000	$ 232,448,000
Charge-offs		(17,612,000)	(17,999,000)
Recoveries		8,404,000	8,879,000
Provision for loan losses		3,000,000	5,000,000
Ending Balance		204,034,000	228,328,000
Allowance - individually evaluated for impairment		57,876,000	66,361,000
Allowance - collectively evaluated for impairment		145,010,000	158,872,000
Allowance - purchased credit impaired loans		1,148,000	3,095,000
Individually evaluated for impairment		312,762,000	348,158,000
Collectively evaluated for impairment		17,231,978,000	16,351,273,000
Purchase credit impaired loans - recorded investment		30,254,000	32,692,000
Loans, net of unearned income	[1]	17,574,994,000	16,732,123,000	$ 17,686,502,000
Commercial Financial And Industrial Portfolio Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning Balance		73,637,000	67,011,000
Charge-offs		(6,525,000)	(3,555,000)
Recoveries		780,000	1,953,000
Provision for loan losses		12,995,000	2,243,000
Ending Balance		80,887,000	67,652,000
Allowance - individually evaluated for impairment		9,148,000	6,019,000
Allowance - collectively evaluated for impairment		71,615,000	61,440,000
Allowance - purchased credit impaired loans		124,000	193,000
Individually evaluated for impairment		44,465,000	52,697,000
Collectively evaluated for impairment		10,181,677,000	9,580,800,000
Purchase credit impaired loans - recorded investment		13,041,000	4,858,000
Loans, net of unearned income		10,239,183,000	9,638,355,000	10,436,390,000
Commercial Real Estate Portfolio Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning Balance		25,159,000	18,574,000
Charge-offs		(642,000)	(787,000)
Recoveries		222,000	691,000
Provision for loan losses		887,000	(813,000)
Ending Balance		25,626,000	17,665,000
Allowance - individually evaluated for impairment		488,000	611,000
Allowance - collectively evaluated for impairment		24,840,000	14,642,000
Allowance - purchased credit impaired loans		298,000	2,412,000
Individually evaluated for impairment		8,950,000	12,528,000
Collectively evaluated for impairment		1,826,677,000	1,282,944,000
Purchase credit impaired loans - recorded investment		12,942,000	25,425,000
Loans, net of unearned income		1,848,569,000	1,320,897,000	1,674,935,000
Consumer Real Estate Portfolio Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning Balance		80,614,000	113,011,000
Charge-offs		(6,926,000)	(8,537,000)
Recoveries		5,735,000	4,724,000
Provision for loan losses		(12,102,000)	47,000
Ending Balance		67,321,000	109,245,000
Allowance - individually evaluated for impairment		31,119,000	41,737,000
Allowance - collectively evaluated for impairment		35,477,000	67,018,000
Allowance - purchased credit impaired loans		725,000	490,000
Individually evaluated for impairment		162,128,000	171,611,000
Collectively evaluated for impairment		4,523,885,000	4,748,806,000
Purchase credit impaired loans - recorded investment		4,217,000	2,400,000
Loans, net of unearned income	[2]	4,690,230,000	4,922,817,000	4,766,518,000
Permanent Mortgage Portfolio Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning Balance		18,947,000	19,122,000
Charge-offs		(112,000)	(1,184,000)
Recoveries		779,000	618,000
Provision for loan losses		(860,000)	1,630,000
Ending Balance		18,754,000	20,186,000
Allowance - individually evaluated for impairment		16,975,000	17,766,000
Allowance - collectively evaluated for impairment		1,779,000	2,420,000
Allowance - purchased credit impaired loans		0	0
Individually evaluated for impairment		96,874,000	110,838,000
Collectively evaluated for impairment		345,917,000	400,870,000
Purchase credit impaired loans - recorded investment		0	0
Loans, net of unearned income		442,791,000	511,708,000	454,123,000
Credit Card & Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning Balance		11,885,000	14,730,000
Charge-offs		(3,407,000)	(3,936,000)
Recoveries		888,000	893,000
Provision for loan losses		2,080,000	1,893,000
Ending Balance		11,446,000	13,580,000
Allowance - individually evaluated for impairment		146,000	228,000
Allowance - collectively evaluated for impairment		11,299,000	13,352,000
Allowance - purchased credit impaired loans		1,000	0
Individually evaluated for impairment		345,000	484,000
Collectively evaluated for impairment		353,822,000	337,853,000
Purchase credit impaired loans - recorded investment		54,000	9,000
Loans, net of unearned income		$ 354,221,000	$ 338,346,000	$ 354,536,000

[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.

[2] Balances as of March 31, 2016 and 2015, and December 31, 2015, include $ 47.8 million , $ 71 . 6 million, and $ 52 .8 million of restricted real estate loans, respectively. See Note 13 - Variable Interest Entities for additional information.