Loans (Rollforward Of The Allowance For Loan Losses By Portfolio Segment) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2013		Sep. 30, 2012		Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning Balance	$ 261,934		$ 321,051		$ 276,963		$ 384,351
Charge-offs	(26,046)		(87,022)		(92,418)		(193,833)
Recoveries	9,822		7,715		31,165		28,226
Provision for loan losses	10,000		40,000		40,000		63,000
Ending Balance	255,710		281,744		255,710		281,744
Allowance - individually evaluated for impairment	74,567		81,709		74,567		81,709
Allowance - collectively evaluated for impairment	181,143		200,035		181,143		200,035
Individually evaluated for impairment	448,080		495,332		448,080		495,332
Collectively evaluated for impairment	14,911,712		16,028,451		14,911,712		16,028,451
Purchase credit impaired loans	48,764				48,764
Loans, net of unearned income	15,408,556		16,523,783		15,408,556		16,523,783		16,708,582
Commercial Financial And Industrial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning Balance	93,502		110,645		96,191		130,413
Charge-offs	(4,869)		(7,077)		(16,201)		(23,310)
Recoveries	3,242		1,892		9,839		8,568
Provision for loan losses	(495)		1,081		1,551		(9,130)
Ending Balance	91,380		106,541		91,380		106,541
Allowance - individually evaluated for impairment	15,702		28,672		15,702		28,672
Allowance - collectively evaluated for impairment	75,678		77,869		75,678		77,869
Individually evaluated for impairment	102,729		153,480		102,729		153,480
Collectively evaluated for impairment	7,641,803		8,312,970		7,641,803		8,312,970
Purchase credit impaired loans	2,410				2,410
Loans, net of unearned income	7,746,942		8,466,450		7,746,942		8,466,450		8,796,956
Commercial Real Estate Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning Balance	13,931		41,546		19,997		55,586
Charge-offs	(515)		(4,446)		(2,612)		(18,070)
Recoveries	587		1,240		2,703		2,779
Provision for loan losses	(3,010)		(10,991)		(9,095)		(12,946)
Ending Balance	10,993		27,349		10,993		27,349
Allowance - individually evaluated for impairment	1,581		183		1,581		183
Allowance - collectively evaluated for impairment	9,412		27,166		9,412		27,166
Individually evaluated for impairment	30,266		66,357		30,266		66,357
Collectively evaluated for impairment	1,098,002		1,163,498		1,098,002		1,163,498
Purchase credit impaired loans	45,443				45,443
Loans, net of unearned income	1,173,711		1,229,855		1,173,711		1,229,855		1,168,235
Consumer Real Estate Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning Balance	120,848		133,421		128,949		165,077
Charge-offs	(16,412)		(69,351)		(58,792)		(132,618)
Recoveries	4,398		2,941		14,932		12,255
Provision for loan losses	11,992		48,938		35,737		71,235
Ending Balance	120,826		115,949		120,826		115,949
Allowance - individually evaluated for impairment	38,426		31,629		38,426		31,629
Allowance - collectively evaluated for impairment	82,400		84,320		82,400		84,320
Individually evaluated for impairment	170,401		145,481		170,401		145,481
Collectively evaluated for impairment	5,286,752		5,590,423		5,286,752		5,590,423
Purchase credit impaired loans	894				894
Loans, net of unearned income	5,458,047	[1]	5,735,904	[1]	5,458,047	[1]	5,735,904	[1]	5,688,703	[1]
Permanent Mortgage Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning Balance	27,103		29,112		24,928		26,194
Charge-offs	(1,366)		(2,889)		(6,577)		(10,597)
Recoveries	841		734		1,609		1,905
Provision for loan losses	(1,022)		(1,400)		5,596		8,055
Ending Balance	25,556		25,557		25,556		25,557
Allowance - individually evaluated for impairment	18,646		20,988		18,646		20,988
Allowance - collectively evaluated for impairment	6,910		4,569		6,910		4,569
Individually evaluated for impairment	144,036		129,101		144,036		129,101
Collectively evaluated for impairment	553,658		676,410		553,658		676,410
Purchase credit impaired loans	0				0
Loans, net of unearned income	697,694	[2]	805,511	[2]	697,694	[2]	805,511	[2]	765,583	[2]
Credit Card And Other Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning Balance	6,550		6,327		6,898		7,081
Charge-offs	(2,884)		(3,259)		(8,236)		(9,238)
Recoveries	754		908		2,082		2,719
Provision for loan losses	2,535		2,372		6,211		5,786
Ending Balance	6,955		6,348		6,955		6,348
Allowance - individually evaluated for impairment	212		237		212		237
Allowance - collectively evaluated for impairment	6,743		6,111		6,743		6,111
Individually evaluated for impairment	648		913		648		913
Collectively evaluated for impairment	331,497		285,150		331,497		285,150
Purchase credit impaired loans	17				17
Loans, net of unearned income	$ 332,162		$ 286,063		$ 332,162		$ 286,063		$ 289,105

[1] Balances as of September 30, 2013 and 2012, and December 31, 2012 include $349.3 million, $417.0 million and $402.4 million of restricted and secured real estate loans, respectively. See Note 14 - Variable Interest Entities for additional information.

[2] Balances as of September 30, 2013 and 2012, and December 31, 2012 include $11.7 million, $14.2 million and $13.2 million of restricted and secured real estate loans, respectively. See Note 14 - Variable Interest Entities for additional information.