Allowance For Loan Losses (Rollforward Of The Allowance For Loan Losses By Portfolio Segment) (Details) - USD ($)		3 Months Ended			6 Months Ended
		Jun. 30, 2015		Jun. 30, 2014	Jun. 30, 2015		Jun. 30, 2014	Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning Balance		$ 228,328,000		$ 247,246,000	$ 232,448,000		$ 253,809,000
Charge-offs		(19,434,000)		(18,764,000)	(37,433,000)		(43,456,000)
Recoveries		10,457,000		10,146,000	19,336,000		18,275,000
Provision/(provision credit) for loan losses		2,000,000		5,000,000	7,000,000		15,000,000
Ending Balance		221,351,000		243,628,000	221,351,000		243,628,000
Allowance - individually evaluated for impairment		72,980,000		68,897,000	72,980,000		68,897,000
Allowance - collectively evaluated for impairment		145,587,000		172,276,000	145,587,000		172,276,000
Allowance - purchased credit impaired loans		2,784,000		2,455,000	2,784,000		2,455,000
Individually evaluated for impairment		347,901,000		371,136,000	347,901,000		371,136,000
Collectively evaluated for impairment		16,559,020,000		15,381,698,000	16,559,020,000		15,381,698,000
Purchase credit impaired loans - recorded investment		29,851,000		42,875,000	29,851,000		42,875,000
Loans, net of unearned income		16,936,772,000	[1]	15,795,709,000	16,936,772,000	[1]	15,795,709,000	$ 16,230,166,000
Commercial Financial And Industrial Portfolio Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning Balance		67,652,000		72,732,000	67,011,000		86,446,000
Charge-offs		(4,976,000)		(5,449,000)	(8,531,000)		(11,256,000)
Recoveries		926,000		1,517,000	2,879,000		3,119,000
Provision/(provision credit) for loan losses		15,148,000		(209,000)	17,391,000		(9,718,000)
Ending Balance		78,750,000		68,591,000	78,750,000		68,591,000
Allowance - individually evaluated for impairment		12,927,000		4,075,000	12,927,000		4,075,000
Allowance - collectively evaluated for impairment		65,646,000		64,473,000	65,646,000		64,473,000
Allowance - purchased credit impaired loans		177,000		43,000	177,000		43,000
Individually evaluated for impairment		55,736,000		51,404,000	55,736,000		51,404,000
Collectively evaluated for impairment		9,771,780,000		8,344,652,000	9,771,780,000		8,344,652,000
Purchase credit impaired loans - recorded investment		5,047,000		6,780,000	5,047,000		6,780,000
Loans, net of unearned income		9,832,563,000		8,402,836,000	9,832,563,000		8,402,836,000	9,007,286,000
Commercial Real Estate Portfolio Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning Balance		17,665,000		15,523,000	18,574,000		10,603,000
Charge-offs		(888,000)		(747,000)	(1,675,000)		(1,374,000)
Recoveries		153,000		1,732,000	844,000		2,011,000
Provision/(provision credit) for loan losses		4,562,000		(687,000)	3,749,000		4,581,000
Ending Balance		21,492,000		15,821,000	21,492,000		15,821,000
Allowance - individually evaluated for impairment		635,000		1,308,000	635,000		1,308,000
Allowance - collectively evaluated for impairment		18,743,000		12,143,000	18,743,000		12,143,000
Allowance - purchased credit impaired loans		2,114,000		2,370,000	2,114,000		2,370,000
Individually evaluated for impairment		12,493,000		22,857,000	12,493,000		22,857,000
Collectively evaluated for impairment		1,365,846,000		1,173,348,000	1,365,846,000		1,173,348,000
Purchase credit impaired loans - recorded investment		22,376,000		35,308,000	22,376,000		35,308,000
Loans, net of unearned income		1,400,715,000		1,231,513,000	1,400,715,000		1,231,513,000	1,277,717,000
Consumer Real Estate Portfolio Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning Balance		109,245,000		123,409,000	113,011,000		126,785,000
Charge-offs		(6,903,000)		(8,074,000)	(15,440,000)		(20,338,000)
Recoveries		7,851,000		5,470,000	12,575,000		10,444,000
Provision/(provision credit) for loan losses		(24,736,000)		(2,768,000)	(24,689,000)		1,146,000
Ending Balance		85,457,000		118,037,000	85,457,000		118,037,000
Allowance - individually evaluated for impairment		41,406,000		43,925,000	41,406,000		43,925,000
Allowance - collectively evaluated for impairment		43,558,000		74,071,000	43,558,000		74,071,000
Allowance - purchased credit impaired loans		493,000		41,000	493,000		41,000
Individually evaluated for impairment		172,097,000		176,885,000	172,097,000		176,885,000
Collectively evaluated for impairment		4,695,754,000		5,041,270,000	4,695,754,000		5,041,270,000
Purchase credit impaired loans - recorded investment		2,420,000		775,000	2,420,000		775,000
Loans, net of unearned income	[2]	4,870,271,000		5,218,930,000	4,870,271,000		5,218,930,000	5,048,071,000
Permanent Mortgage Portfolio Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning Balance		20,186,000		22,521,000	19,122,000		22,491,000
Charge-offs		(809,000)		(879,000)	(1,993,000)		(3,097,000)
Recoveries		671,000		694,000	1,289,000		1,272,000
Provision/(provision credit) for loan losses		2,329,000		1,391,000	3,959,000		3,061,000
Ending Balance		22,377,000		23,727,000	22,377,000		23,727,000
Allowance - individually evaluated for impairment		17,857,000		19,323,000	17,857,000		19,323,000
Allowance - collectively evaluated for impairment		4,520,000		4,404,000	4,520,000		4,404,000
Allowance - purchased credit impaired loans		0		0	0		0
Individually evaluated for impairment		107,157,000		119,466,000	107,157,000		119,466,000
Collectively evaluated for impairment		380,522,000		474,535,000	380,522,000		474,535,000
Purchase credit impaired loans - recorded investment		0		0	0		0
Loans, net of unearned income		487,679,000		594,001,000	487,679,000		594,001,000	538,961,000
Credit Card & Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning Balance		13,580,000		13,061,000	14,730,000		7,484,000
Charge-offs		(5,858,000)		(3,615,000)	(9,794,000)		(7,391,000)
Recoveries		856,000		733,000	1,749,000		1,429,000
Provision/(provision credit) for loan losses		4,697,000		7,273,000	6,590,000		15,930,000
Ending Balance		13,275,000		17,452,000	13,275,000		17,452,000
Allowance - individually evaluated for impairment		155,000		266,000	155,000		266,000
Allowance - collectively evaluated for impairment		13,120,000		17,185,000	13,120,000		17,185,000
Allowance - purchased credit impaired loans		0		1,000	0		1,000
Individually evaluated for impairment		418,000		524,000	418,000		524,000
Collectively evaluated for impairment		345,118,000		347,893,000	345,118,000		347,893,000
Purchase credit impaired loans - recorded investment		8,000		12,000	8,000		12,000
Loans, net of unearned income		$ 345,544,000		$ 348,429,000	$ 345,544,000		$ 348,429,000	$ 358,131,000

[1] June 30, 2015 includes $28.3 million of held-to-maturity consumer mortgage loans secured by residential real estate in process of foreclosure.

[2] (a) Balances as of June 30, 2015 and 2014, and December 31, 2014 include $ 66 .4 million, $ 84.4 million, and $ 76.8 million of restricted real estate loans, respectively. See Note 13 - Variable Interest Entities for additional information.