Allowance For Loan Losses (Rollforward Of The Allowance For Loan Losses By Portfolio Segment) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2014		Jun. 30, 2013		Jun. 30, 2014		Jun. 30, 2013		Dec. 31, 2013
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	$ 247,246		$ 265,218		$ 253,809		$ 276,963
Charge-offs	(18,764)		(30,272)		(43,456)		(66,372)
Recoveries	10,146		11,988		18,275		21,343
Provision for loan losses	5,000		15,000		15,000		30,000
Ending Balance	243,628		261,934		243,628		261,934
Allowance - individually evaluated for impairment	68,897		82,111		68,897		82,111
Allowance - collectively evaluated for impairment	172,276		179,823		172,276		179,823
Allowance - purchased credit-impaired loans	2,455				2,455
Individually evaluated for impairment	371,136		460,983		371,136		460,983
Collectively evaluated for impairment	15,381,698		15,687,826	[1]	15,381,698		15,687,826	[1]
Purchased credit-impaired loans - recorded investment	42,875		49,143	[2]	42,875		49,143	[2]
Loans, net of unearned income	15,795,709		16,197,952	[3]	15,795,709		16,197,952	[3]	15,389,074
Commercial Financial And Industrial Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	72,732		86,105		86,446		96,191
Charge-offs	(5,449)		(6,896)		(11,256)		(11,332)
Recoveries	1,517		4,101		3,119		6,597
Provision for loan losses	(209)		10,192		(9,718)		2,046
Ending Balance	68,591		93,502		68,591		93,502
Allowance - individually evaluated for impairment	4,075		16,201		4,075		16,201
Allowance - collectively evaluated for impairment	64,473		77,301		64,473		77,301
Allowance - purchased credit-impaired loans	43				43
Individually evaluated for impairment	51,404		118,081		51,404		118,081
Collectively evaluated for impairment	8,344,652		8,242,238	[1]	8,344,652		8,242,238	[1]
Purchased credit-impaired loans - recorded investment	6,780		7,748	[2]	6,780		7,748	[2]
Loans, net of unearned income	8,402,836		8,368,067	[1]	8,402,836		8,368,067	[1]	7,923,576
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	15,523		15,138		10,603		19,997
Charge-offs	(747)		(716)		(1,374)		(2,097)
Recoveries	1,732		1,470		2,011		2,116
Provision for loan losses	(687)		(1,961)		4,581		(6,085)
Ending Balance	15,821		13,931		15,821		13,931
Allowance - individually evaluated for impairment	1,308		552		1,308		552
Allowance - collectively evaluated for impairment	12,143		13,379		12,143		13,379
Allowance - purchased credit-impaired loans	2,370				2,370
Individually evaluated for impairment	22,857		40,856		22,857		40,856
Collectively evaluated for impairment	1,173,348		1,136,870		1,173,348		1,136,870
Purchased credit-impaired loans - recorded investment	35,308		40,480	[2]	35,308		40,480	[2]
Loans, net of unearned income	1,231,513		1,218,206		1,231,513		1,218,206		1,133,279
Consumer Real Estate Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	123,409		131,417		126,785		128,949
Charge-offs	(8,074)		(18,384)		(20,338)		(42,380)
Recoveries	5,470		5,030		10,444		10,534
Provision for loan losses	(2,768)		2,785		1,146		23,745
Ending Balance	118,037		120,848		118,037		120,848
Allowance - individually evaluated for impairment	43,925		42,393		43,925		42,393
Allowance - collectively evaluated for impairment	74,071		78,455		74,071		78,455
Allowance - purchased credit-impaired loans	41				41
Individually evaluated for impairment	176,885		178,198		176,885		178,198
Collectively evaluated for impairment	5,041,270		5,370,345		5,041,270		5,370,345
Purchased credit-impaired loans - recorded investment	775		897	[2]	775		897	[2]
Loans, net of unearned income	5,218,930	[4]	5,549,440	[4]	5,218,930	[4]	5,549,440	[4]	5,333,371	[4]
Permanent Mortgage Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	22,521		25,448		22,491		24,928
Charge-offs	(879)		(1,824)		(3,097)		(5,211)
Recoveries	694		624		1,272		768
Provision for loan losses	1,391		2,855		3,061		6,618
Ending Balance	23,727		27,103		23,727		27,103
Allowance - individually evaluated for impairment	19,323		22,725		19,323		22,725
Allowance - collectively evaluated for impairment	4,404		4,378		4,404		4,378
Allowance - purchased credit-impaired loans	0				0
Individually evaluated for impairment	119,466		123,131		119,466		123,131
Collectively evaluated for impairment	474,535		623,023		474,535		623,023
Purchased credit-impaired loans - recorded investment	0		0		0		0
Loans, net of unearned income	594,001		746,154	[5]	594,001		746,154	[5]	662,242	[5]
Credit Card And Other Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	13,061		7,110		7,484		6,898
Charge-offs	(3,615)		(2,452)		(7,391)		(5,352)
Recoveries	733		763		1,429		1,328
Provision for loan losses	7,273		1,129		15,930		3,676
Ending Balance	17,452		6,550		17,452		6,550
Allowance - individually evaluated for impairment	266		240		266		240
Allowance - collectively evaluated for impairment	17,185		6,310		17,185		6,310
Allowance - purchased credit-impaired loans	1				1
Individually evaluated for impairment	524		717		524		717
Collectively evaluated for impairment	347,893		315,350		347,893		315,350
Purchased credit-impaired loans - recorded investment	12		18		12		18
Loans, net of unearned income	$ 348,429		$ 316,085		$ 348,429		$ 316,085		$ 336,606

[1] Balance as of June 30, 2013 has been re-presented due to purchase accounting adjustments made in third quarter 2013.

[2] Balance as of June 30, 2013 has been re-presented as the PCI loan population was finalized in third quarter 2013.

[3] June 30, 2013 balance has been re-presented due to purchase accounting adjustments made in third quarter 2013.

[4] Balances as of June 30, 2014 and 2013, and December 31, 2013 include $84.4 million, $367.0 million, and $333.8 million of restricted and secured real estate loans, respectively. See Note 14 - Variable Interest Entities for additional information.

[5] Balances as of June 30, 2013, and December 31, 2013 include $12.4 million and $11.2 million of restricted and secured real estate loans, respectively. See Note 14 - Variable Interest Entities for additional information.