Loans And Allowance For Loan Losses (Schedule Of Allowances For Loan Losses And Recorded Investment In Loans) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended										12 Months Ended
	Dec. 31, 2013		Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012		Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance, allowance					$ 373,405					$ 703,547	$ 373,405		$ 536,494		$ 703,547
Charge-offs											(179,953)		(556,775)		(639,714)
Recoveries											44,510		73,317		53,866
Provision for loan losses	14,064		6,761	13,077	35,696	146,526		63,572	44,222	66,049	69,598		320,369		418,795
Ending balance, allowance	307,560					373,405					307,560		373,405		536,494
Ending balance: individually evaluated for impairment, allowance	67,997					84,775					67,997		84,775		109,484
Ending balance: collectively evaluated for impairment	239,563					288,630					239,563		288,630		427,010
Ending balance: total loans	20,086,660	[1]				19,562,063	[2]				20,086,660	[1]	19,562,063	[2]	20,091,799	[3]
Ending balance: individually evaluated for impairment, loans	836,554					1,062,520					836,554		1,062,520		1,307,572
Ending balance: individually evaluated for impairment	19,250,106					18,499,543					19,250,106		18,499,543		18,784,227
Deferred fees and costs, net	28,862					20,373					28,862		20,373		12,000
Commercial Real Estate [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance, allowance					167,926					353,923	167,926		249,094		353,923
Charge-offs											(86,990)		(316,699)		(384,297)
Recoveries											17,068		36,576		25,604
Provision for loan losses											29,008		198,955		253,864
Ending balance, allowance	127,012					167,926					127,012		167,926		249,094
Ending balance: individually evaluated for impairment, allowance	46,737					58,948					46,737		58,948		64,447
Ending balance: collectively evaluated for impairment	80,275					108,978					80,275		108,978		184,647
Ending balance: total loans	6,437,752	[1]				6,497,864	[2]				6,437,752	[1]	6,497,864	[2]	7,282,420	[3]
Ending balance: individually evaluated for impairment, loans	537,736					685,078					537,736		685,078		870,157
Ending balance: individually evaluated for impairment	5,900,016					5,812,786					5,900,016		5,812,786		6,412,263
Commercial And Industrial [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance, allowance					138,495					223,981	138,495		187,409		223,981
Charge-offs											(58,977)		(184,811)		(179,717)
Recoveries											19,918		27,745		19,768
Provision for loan losses											16,633		108,152		123,377
Ending balance, allowance	116,069					138,495					116,069		138,495		187,409
Ending balance: individually evaluated for impairment, allowance	20,068					24,678					20,068		24,678		42,600
Ending balance: collectively evaluated for impairment	96,001					113,817					96,001		113,817		144,809
Ending balance: total loans	10,000,675	[1]				9,569,451	[2]				10,000,675	[1]	9,569,451	[2]	9,229,805	[3]
Ending balance: individually evaluated for impairment, loans	243,856					313,876					243,856		313,876		384,455
Ending balance: individually evaluated for impairment	9,756,819					9,255,575					9,756,819		9,255,575		8,845,350
Retail [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance, allowance					38,984					41,555	38,984		51,993		41,555
Charge-offs											(33,986)		(55,265)		(75,700)
Recoveries											7,524		8,996		8,494
Provision for loan losses											28,957		33,260		77,644
Ending balance, allowance	41,479					38,984					41,479		38,984		51,993
Ending balance: individually evaluated for impairment, allowance	1,192					1,149					1,192		1,149		2,437
Ending balance: collectively evaluated for impairment	40,287					37,835					40,287		37,835		49,556
Ending balance: total loans	3,648,233	[1]				3,494,748	[2]				3,648,233	[1]	3,494,748	[2]	3,579,574	[3]
Ending balance: individually evaluated for impairment, loans	54,962					63,566					54,962		63,566		52,960
Ending balance: individually evaluated for impairment	3,593,271					3,431,182					3,593,271		3,431,182		3,526,614
Unallocated [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance, allowance					28,000					84,088	28,000		47,998		84,088
Charge-offs											0		0		0
Recoveries											0		0		0
Provision for loan losses											(5,000)		(19,998)		(36,090)
Ending balance, allowance	23,000					28,000					23,000		28,000		47,998
Ending balance: individually evaluated for impairment, allowance	0					0					0		0		0
Ending balance: collectively evaluated for impairment	23,000					28,000					23,000		28,000		47,998
Ending balance: total loans	0	[1]				0	[2]				0	[1]	0	[2]	0	[3]
Ending balance: individually evaluated for impairment, loans	0					0					0		0		0
Ending balance: individually evaluated for impairment	$ 0					$ 0					$ 0		$ 0		$ 0

[1] Total before net deferred fees and costs of $28.9 million.

[2] Total before net deferred fees and costs of $20.4 million.

[3] Total before net deferred fees and costs of $12.0 million.