Loans and Allowance for Loan Losses (Schedule Of Allowances For Loan Losses And Recorded Investment In Loans) (Details) (USD $)	3 Months Ended				6 Months Ended
	Jun. 30, 2012		Jun. 30, 2011		Jun. 30, 2012		Jun. 30, 2011		Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance, allowance	$ 507,794,000		$ 678,426,000		$ 536,494,000		$ 703,547,000
Charge-offs	(110,489,000)		(181,642,000)		(215,978,000)		362,417,000
Recoveries	11,798,000		14,458,000		22,538,000		28,366,000
Provision for loan losses	44,222,000		120,159,000		110,271,000		(261,905,000)
Ending balance, allowance	453,325,000		631,401,000		453,325,000		631,401,000
Ending balance: individually evaluated for impairment, allowance	94,949,000		92,920,000		94,949,000		92,920,000
Ending balance: collectively evaluated for impairment, allowance	358,376,000		538,481,000		358,376,000		538,481,000
Total loans	19,693,445,000	[1],[2]	20,513,597,000	[3]	19,693,445,000	[1],[2]	20,513,597,000	[3]	20,091,799,000	[1],[4]
Ending balance: individually evaluated for impairment, loans	1,217,494,000		1,183,839,000		1,217,494,000		1,183,839,000
Ending balance: collectively evaluated for impairment, loans	18,475,951,000		19,329,758,000		18,475,951,000		19,329,758,000
Deferred fees and costs, net	13,300,000		8,800,000		13,300,000		8,800,000		12,000,000
Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance, allowance	239,974,000		337,130,000		249,094,000		353,923,000
Charge-offs	(60,457,000)		(99,215,000)		(112,919,000)		214,328,000
Recoveries	6,106,000		8,462,000		10,611,000		15,415,000
Provision for loan losses	24,585,000		98,980,000		63,422,000		(190,347,000)
Ending balance, allowance	210,208,000		345,357,000		210,208,000		345,357,000
Ending balance: individually evaluated for impairment, allowance	57,474,000		62,631,000		57,474,000		62,631,000
Ending balance: collectively evaluated for impairment, allowance	152,734,000		282,726,000		152,734,000		282,726,000
Total loans	6,884,277,000		7,795,352,000		6,884,277,000		7,795,352,000
Ending balance: individually evaluated for impairment, loans	791,924,000		849,172,000		791,924,000		849,172,000
Ending balance: collectively evaluated for impairment, loans	6,092,353,000		6,946,180,000		6,092,353,000		6,946,180,000
Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance, allowance	178,200,000		216,363,000		184,888,000		222,058,000
Charge-offs	(37,814,000)		(61,874,000)		(75,240,000)		104,275,000
Recoveries	3,929,000		3,499,000		7,551,000		7,570,000
Provision for loan losses	8,910,000		39,303,000		36,026,000		(71,938,000)
Ending balance, allowance	153,225,000		197,291,000		153,225,000		197,291,000
Ending balance: individually evaluated for impairment, allowance	36,623,000		29,842,000		36,623,000		29,842,000
Ending balance: collectively evaluated for impairment, allowance	116,602,000		167,449,000		116,602,000		167,449,000
Total loans	8,884,633,000		8,846,592,000		8,884,633,000		8,846,592,000
Ending balance: individually evaluated for impairment, loans	365,487,000		302,309,000		365,487,000		302,309,000
Ending balance: collectively evaluated for impairment, loans	8,519,146,000		8,544,283,000		8,519,146,000		8,544,283,000
Retail [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance, allowance	51,620,000		43,042,000		54,514,000		43,478,000
Charge-offs	(12,218,000)		(20,553,000)		(27,819,000)		43,814,000
Recoveries	1,763,000		2,497,000		4,376,000		5,381,000
Provision for loan losses	10,727,000		15,804,000		20,821,000		(35,745,000)
Ending balance, allowance	51,892,000		40,790,000		51,892,000		40,790,000
Ending balance: individually evaluated for impairment, allowance	852,000		447,000		852,000		447,000
Ending balance: collectively evaluated for impairment, allowance	51,040,000		40,343,000		51,040,000		40,343,000
Total loans	3,924,535,000		3,871,653,000		3,924,535,000		3,871,653,000
Ending balance: individually evaluated for impairment, loans	60,083,000		32,358,000		60,083,000		32,358,000
Ending balance: collectively evaluated for impairment, loans	3,864,452,000		3,839,295,000		3,864,452,000		3,839,295,000
Unallocated [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance, allowance	38,000,000		81,891,000		47,998,000		84,088,000
Charge-offs	0		0		0		0
Recoveries	0		0		0		0
Provision for loan losses	0		(33,928,000)		(9,998,000)		36,125,000
Ending balance, allowance	38,000,000		47,963,000		38,000,000		47,963,000
Ending balance: individually evaluated for impairment, allowance	0		0		0		0
Ending balance: collectively evaluated for impairment, allowance	38,000,000		47,963,000		38,000,000		47,963,000
Total loans	0		0		0		0
Ending balance: individually evaluated for impairment, loans	0		0		0		0
Ending balance: collectively evaluated for impairment, loans	$ 0		$ 0		$ 0		$ 0

[1] Loan balances in each category expressed as a component of total loans, excluding deferred fees and costs.

[2] Total excludes $13.3 million in net deferred fees and costs

[3] Total excludes $8.8 million in net deferred fees and costs

[4] Total excludes $12.0 million in net deferred fees and costs