Allowance For Loan Losses (Rollforward Of The Allowance For Loan Losses By Portfolio Segment) (Details) - USD ($)		3 Months Ended			9 Months Ended
		Sep. 30, 2015		Sep. 30, 2014	Sep. 30, 2015		Sep. 30, 2014	Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning Balance		$ 221,351,000		$ 243,628,000	$ 232,448,000		$ 253,809,000
Charge-offs		(21,809,000)		(23,684,000)	(59,242,000)		(67,140,000)
Recoveries		10,272,000		12,697,000	29,608,000		30,972,000
Provision/(provision credit) for loan losses		1,000,000		6,000,000	8,000,000		21,000,000
Ending Balance		210,814,000		238,641,000	210,814,000		238,641,000
Allowance - individually evaluated for impairment		56,525,000		66,219,000	56,525,000		66,219,000
Allowance - collectively evaluated for impairment		151,370,000		169,583,000	151,370,000		169,583,000
Allowance - purchased credit impaired loans		2,919,000		2,839,000	2,919,000		2,839,000
Individually evaluated for impairment		325,470,000		362,844,000	325,470,000		362,844,000
Collectively evaluated for impairment		16,372,366,000		15,409,050,000	16,372,366,000		15,409,050,000
Purchase credit impaired loans - recorded investment		27,656,000		40,123,000	27,656,000		40,123,000
Loans, net of unearned income		16,725,492,000	[1]	15,812,017,000	16,725,492,000	[1]	15,812,017,000	$ 16,230,166,000
Commercial Financial And Industrial Portfolio Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning Balance		78,750,000		68,591,000	67,011,000		86,446,000
Charge-offs		(8,632,000)		(3,741,000)	(17,163,000)		(14,997,000)
Recoveries		2,264,000		5,219,000	5,143,000		8,338,000
Provision/(provision credit) for loan losses		(919,000)		(199,000)	16,472,000		(9,917,000)
Ending Balance		71,463,000		69,870,000	71,463,000		69,870,000
Allowance - individually evaluated for impairment		6,156,000		6,039,000	6,156,000		6,039,000
Allowance - collectively evaluated for impairment		65,063,000		63,783,000	65,063,000		63,783,000
Allowance - purchased credit impaired loans		244,000		48,000	244,000		48,000
Individually evaluated for impairment		39,659,000		46,862,000	39,659,000		46,862,000
Collectively evaluated for impairment		9,565,626,000		8,425,391,000	9,565,626,000		8,425,391,000
Purchase credit impaired loans - recorded investment		5,010,000		5,076,000	5,010,000		5,076,000
Loans, net of unearned income		9,610,295,000		8,477,329,000	9,610,295,000		8,477,329,000	9,007,286,000
Commercial Real Estate Portfolio Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning Balance		21,492,000		15,821,000	18,574,000		10,603,000
Charge-offs		(533,000)		(1,789,000)	(2,208,000)		(3,163,000)
Recoveries		868,000		312,000	1,712,000		2,323,000
Provision/(provision credit) for loan losses		3,521,000		1,106,000	7,270,000		5,687,000
Ending Balance		25,348,000		15,450,000	25,348,000		15,450,000
Allowance - individually evaluated for impairment		587,000		1,104,000	587,000		1,104,000
Allowance - collectively evaluated for impairment		22,591,000		11,613,000	22,591,000		11,613,000
Allowance - purchased credit impaired loans		2,170,000		2,733,000	2,170,000		2,733,000
Individually evaluated for impairment		10,309,000		22,365,000	10,309,000		22,365,000
Collectively evaluated for impairment		1,457,568,000		1,221,636,000	1,457,568,000		1,221,636,000
Purchase credit impaired loans - recorded investment		20,167,000		34,393,000	20,167,000		34,393,000
Loans, net of unearned income		1,488,044,000		1,278,394,000	1,488,044,000		1,278,394,000	1,277,717,000
Consumer Real Estate Portfolio Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning Balance		85,457,000		118,037,000	113,011,000		126,785,000
Charge-offs		(7,994,000)		(13,465,000)	(23,434,000)		(33,803,000)
Recoveries		5,785,000		5,669,000	18,360,000		16,113,000
Provision/(provision credit) for loan losses		(776,000)		8,154,000	(25,465,000)		9,300,000
Ending Balance		82,472,000		118,395,000	82,472,000		118,395,000
Allowance - individually evaluated for impairment		33,918,000		41,492,000	33,918,000		41,492,000
Allowance - collectively evaluated for impairment		48,050,000		76,845,000	48,050,000		76,845,000
Allowance - purchased credit impaired loans		504,000		58,000	504,000		58,000
Individually evaluated for impairment		170,068,000		174,532,000	170,068,000		174,532,000
Collectively evaluated for impairment		4,641,396,000		4,955,813,000	4,641,396,000		4,955,813,000
Purchase credit impaired loans - recorded investment		2,472,000		643,000	2,472,000		643,000
Loans, net of unearned income	[2]	4,813,936,000		5,130,988,000	4,813,936,000		5,130,988,000	5,048,071,000
Permanent Mortgage Portfolio Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning Balance		22,377,000		23,727,000	19,122,000		22,491,000
Charge-offs		(1,038,000)		(1,047,000)	(3,031,000)		(4,144,000)
Recoveries		229,000		686,000	1,518,000		1,958,000
Provision/(provision credit) for loan losses		(1,492,000)		(3,145,000)	2,467,000		(84,000)
Ending Balance		20,076,000		20,221,000	20,076,000		20,221,000
Allowance - individually evaluated for impairment		15,696,000		17,329,000	15,696,000		17,329,000
Allowance - collectively evaluated for impairment		4,380,000		2,892,000	4,380,000		2,892,000
Allowance - purchased credit impaired loans		0		0	0		0
Individually evaluated for impairment		105,054,000		118,537,000	105,054,000		118,537,000
Collectively evaluated for impairment		358,839,000		454,252,000	358,839,000		454,252,000
Purchase credit impaired loans - recorded investment		0		0	0		0
Loans, net of unearned income		463,893,000		572,789,000	463,893,000		572,789,000	538,961,000
Credit Card & Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning Balance		13,275,000		17,452,000	14,730,000		7,484,000
Charge-offs		(3,612,000)		(3,642,000)	(13,406,000)		(11,033,000)
Recoveries		1,126,000		811,000	2,875,000		2,240,000
Provision/(provision credit) for loan losses		666,000		84,000	7,256,000		16,014,000
Ending Balance		11,455,000		14,705,000	11,455,000		14,705,000
Allowance - individually evaluated for impairment		168,000		255,000	168,000		255,000
Allowance - collectively evaluated for impairment		11,286,000		14,450,000	11,286,000		14,450,000
Allowance - purchased credit impaired loans		1,000		0	1,000		0
Individually evaluated for impairment		380,000		548,000	380,000		548,000
Collectively evaluated for impairment		348,937,000		351,958,000	348,937,000		351,958,000
Purchase credit impaired loans - recorded investment		7,000		11,000	7,000		11,000
Loans, net of unearned income		$ 349,324,000		$ 352,517,000	$ 349,324,000		$ 352,517,000	$ 358,131,000

[1] September 30, 2015 includes $30.7 million of held-to-maturity consumer mortgage loans secured by residential real estate in process of foreclosure.

[2] (a) Balances as of September 30, 2015 and 2014, and December 31, 2014 include $ 59. 3 million, $ 81 . 1 million, and $ 76.8 million of restricted real estate loans, respectively. See Note 13 - Variable Interest Entities for additional information.