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, 2013		Jun. 30, 2012	Jun. 30, 2013		Jun. 30, 2012	Dec. 31, 2012
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance, allowance	$ 351,772,000		$ 507,794,000	$ 373,405,000		$ 536,494,000
Charge-offs	47,916,000		110,489,000	115,035,000		215,978,000
Recoveries	17,947,000		11,798,000	27,737,000		22,538,000
Provision for loan losses	(13,077,000)		(44,222,000)	(48,773,000)		(110,271,000)
Ending balance, allowance	334,880,000		453,325,000	334,880,000		453,325,000
Ending balance: individually evaluated for impairment, allowance	76,011,000		94,949,000	76,011,000		94,949,000
Ending balance: collectively evaluated for impairment, allowance	258,869,000		358,376,000	258,869,000		358,376,000
Total loans	19,632,050,000	[1]	19,693,445,000	19,632,050,000	[1]	19,693,445,000	19,562,063,000	[2]
Ending balance: individually evaluated for impairment, loans	967,452,000		1,217,494,000	967,452,000		1,217,494,000
Ending balance: collectively evaluated for impairment, loans	18,664,598,000		18,475,951,000	18,664,598,000		18,475,951,000
Deferred fees and costs, net	23,800,000		13,300,000	23,800,000		13,300,000	20,400,000
Commercial Real Estate [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance, allowance	145,991,000		239,974,000	167,926,000		249,094,000
Charge-offs	28,075,000		60,457,000	64,351,000		112,919,000
Recoveries	5,493,000		6,106,000	9,095,000		10,611,000
Provision for loan losses	(14,920,000)		(24,585,000)	(25,659,000)		(63,422,000)
Ending balance, allowance	138,329,000		210,208,000	138,329,000		210,208,000
Ending balance: individually evaluated for impairment, allowance	47,039,000		57,474,000	47,039,000		57,474,000
Ending balance: collectively evaluated for impairment, allowance	91,290,000		152,734,000	91,290,000		152,734,000
Total loans	6,342,329,000		6,884,277,000	6,342,329,000		6,884,277,000
Ending balance: individually evaluated for impairment, loans	624,402,000		791,924,000	624,402,000		791,924,000
Ending balance: collectively evaluated for impairment, loans	5,717,927,000		6,092,353,000	5,717,927,000		6,092,353,000
Commercial and Industrial [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance, allowance	122,758,000		178,200,000	126,847,000		184,888,000
Charge-offs	10,474,000		37,814,000	27,364,000		75,240,000
Recoveries	10,551,000		3,929,000	14,802,000		7,551,000
Provision for loan losses	(1,043,000)		(8,910,000)	(9,593,000)		(36,026,000)
Ending balance, allowance	123,878,000		153,225,000	123,878,000		153,225,000
Ending balance: individually evaluated for impairment, allowance	27,552,000		36,623,000	27,552,000		36,623,000
Ending balance: collectively evaluated for impairment, allowance	96,326,000		116,602,000	96,326,000		116,602,000
Total loans	9,231,499,000		8,884,633,000	9,231,499,000		8,884,633,000
Ending balance: individually evaluated for impairment, loans	280,717,000		365,487,000	280,717,000		365,487,000
Ending balance: collectively evaluated for impairment, loans	8,950,782,000		8,519,146,000	8,950,782,000		8,519,146,000
Retail [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance, allowance	55,023,000		51,620,000	50,632,000		54,514,000
Charge-offs	9,367,000		12,218,000	23,320,000		27,819,000
Recoveries	1,903,000		1,763,000	3,840,000		4,376,000
Provision for loan losses	(2,114,000)		(10,727,000)	(18,521,000)		(20,821,000)
Ending balance, allowance	49,673,000		51,892,000	49,673,000		51,892,000
Ending balance: individually evaluated for impairment, allowance	1,420,000		852,000	1,420,000		852,000
Ending balance: collectively evaluated for impairment, allowance	48,253,000		51,040,000	48,253,000		51,040,000
Total loans	4,058,222,000		3,924,535,000	4,058,222,000		3,924,535,000
Ending balance: individually evaluated for impairment, loans	62,333,000		60,083,000	62,333,000		60,083,000
Ending balance: collectively evaluated for impairment, loans	3,995,889,000		3,864,452,000	3,995,889,000		3,864,452,000
Unallocated [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance, allowance	28,000,000		38,000,000	28,000,000		47,998,000
Charge-offs	0		0	0		0
Recoveries	0		0	0		0
Provision for loan losses	5,000,000		0	5,000,000		9,998,000
Ending balance, allowance	23,000,000		38,000,000	23,000,000		38,000,000
Ending balance: individually evaluated for impairment, allowance	0		0	0		0
Ending balance: collectively evaluated for impairment, allowance	23,000,000		38,000,000	23,000,000		38,000,000
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] Total before net deferred fees and costs of $23.8 million

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