Allowance For Loan Losses (Rollforward Of The Allowance For Loan Losses By Portfolio Segment) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014		Mar. 31, 2013		Dec. 31, 2013
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	$ 253,809		$ 276,963
Charge-offs	(24,692)		(36,100)
Recoveries	8,129		9,355
Provision for loan losses	10,000		15,000
Ending Balance	247,246		265,218
Allowance - individually evaluated for impairment	69,782		78,867
Allowance - collectively evaluated for impairment	175,565		186,351
Allowance - purchased credit impaired loans	1,899
Individually evaluated for impairment	377,861		441,265
Collectively evaluated for impairment	14,695,248		15,448,405
Purchase credit impaired loans - recorded investment	46,352
Loans, net of unearned income	15,119,461		15,889,670		15,389,074
Commercial Financial And Industrial Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	86,446		96,191
Charge-offs	(5,807)		(4,436)
Recoveries	1,602		2,496
Provision for loan losses	(9,509)		(8,146)
Ending Balance	72,732		86,105
Allowance - individually evaluated for impairment	5,187		15,463
Allowance - collectively evaluated for impairment	67,477		70,642
Allowance - purchased credit impaired loans	68
Individually evaluated for impairment	54,968		111,036
Collectively evaluated for impairment	7,691,266		7,980,150
Purchase credit impaired loans - recorded investment	6,761
Loans, net of unearned income	7,752,995		8,091,186		7,923,576
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	10,603		19,997
Charge-offs	(627)		(1,381)
Recoveries	279		646
Provision for loan losses	5,268		(4,124)
Ending Balance	15,523		15,138
Allowance - individually evaluated for impairment	1,495		156
Allowance - collectively evaluated for impairment	12,207		14,982
Allowance - purchased credit impaired loans	1,821
Individually evaluated for impairment	26,701		43,501
Collectively evaluated for impairment	1,086,829		1,072,378
Purchase credit impaired loans - recorded investment	38,888
Loans, net of unearned income	1,152,418		1,115,879		1,133,279
Consumer Real Estate Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	126,785		128,949
Charge-offs	(12,264)		(23,996)
Recoveries	4,974		5,504
Provision for loan losses	3,914		20,960
Ending Balance	123,409		131,417
Allowance - individually evaluated for impairment	43,653		40,778
Allowance - collectively evaluated for impairment	79,746		90,639
Allowance - purchased credit impaired loans	10
Individually evaluated for impairment	173,577		165,927
Collectively evaluated for impairment	5,083,734		5,424,253
Purchase credit impaired loans - recorded investment	703
Loans, net of unearned income	5,258,014	[1]	5,590,180	[1]	5,333,371	[1]
Permanent Mortgage Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	22,491		24,928
Charge-offs	(2,218)		(3,387)
Recoveries	578		144
Provision for loan losses	1,670		3,763
Ending Balance	22,521		25,448
Allowance - individually evaluated for impairment	19,211		22,239
Allowance - collectively evaluated for impairment	3,310		3,209
Allowance - purchased credit impaired loans	0
Individually evaluated for impairment	121,843		120,054
Collectively evaluated for impairment	500,399		673,228
Purchase credit impaired loans - recorded investment	0
Loans, net of unearned income	622,242	[2]	793,282	[2]	662,242	[2]
Credit Card And Other Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	7,484		6,898
Charge-offs	(3,776)		(2,900)
Recoveries	696		565
Provision for loan losses	8,657		2,547
Ending Balance	13,061		7,110
Allowance - individually evaluated for impairment	236		231
Allowance - collectively evaluated for impairment	12,825		6,879
Allowance - purchased credit impaired loans	0
Individually evaluated for impairment	772		747
Collectively evaluated for impairment	333,020		298,396
Purchase credit impaired loans - recorded investment	0
Loans, net of unearned income	$ 333,792		$ 299,143		$ 336,606

[1] Balances as of March 31, 2014 and 2013, and December 31, 2013 include $86.7 million, $386.4 million, and $333.8 million of restricted and secured real estate loans, respectively. See Note 14 - Variable Interest Entities for additional information.

[2] Balances as of March 31, 2013, and December 31, 2013 include $13.0 million and $11.2 million of restricted and secured real estate loans, respectively. See Note 14 - Variable Interest Entities for additional information.