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, 2014		Jun. 30, 2013	Jun. 30, 2014		Jun. 30, 2013	Dec. 31, 2013
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance, allowance	$ 300,871,000		$ 351,772,000	$ 307,560,000		$ 373,405,000
Allowance for loan losses of sold branches				(1,019,000)
Charge-offs	(42,081,000)		(47,916,000)	(64,356,000)		(115,035,000)
Recoveries	6,709,000		17,947,000	13,803,000		27,737,000
Provision for loan losses	12,284,000		13,077,000	21,795,000		48,773,000
Ending balance, allowance	277,783,000		334,880,000	277,783,000		334,880,000
Ending balance: individually evaluated for impairment, allowance	41,484,000		76,011,000	41,484,000		76,011,000
Ending balance: collectively evaluated for impairment, allowance	236,299,000		258,869,000	236,299,000		258,869,000
Total loans	20,484,718,000	[1]	19,632,050,000	20,484,718,000	[1]	19,632,050,000	20,086,660,000	[2]
Ending balance: individually evaluated for impairment, loans	585,494,000		967,452,000	585,494,000		967,452,000
Ending balance: collectively evaluated for impairment, loans	19,899,224,000		18,664,598,000	19,899,224,000		18,664,598,000
Deferred fees and costs, net	29,000,000		23,800,000	29,000,000		23,800,000	28,900,000
Commercial Real Estate [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance, allowance	126,955,000		145,991,000	127,012,000		167,926,000
Allowance for loan losses of sold branches				(281,000)
Charge-offs	(27,960,000)		(28,075,000)	(35,906,000)		(64,351,000)
Recoveries	2,989,000		5,493,000	5,216,000		9,095,000
Provision for loan losses	240,000		14,920,000	6,183,000		25,659,000
Ending balance, allowance	102,224,000		138,329,000	102,224,000		138,329,000
Ending balance: individually evaluated for impairment, allowance	21,470,000		47,039,000	21,470,000		47,039,000
Ending balance: collectively evaluated for impairment, allowance	80,754,000		91,290,000	80,754,000		91,290,000
Total loans	6,467,993,000	[1]	6,414,750,000	6,467,993,000	[1]	6,414,750,000
Ending balance: individually evaluated for impairment, loans	331,414,000		624,402,000	331,414,000		624,402,000
Ending balance: collectively evaluated for impairment, loans	6,136,579,000		5,790,348,000	6,136,579,000		5,790,348,000
Commercial and Industrial [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance, allowance	128,346,000		134,657,000	116,069,000		138,495,000
Allowance for loan losses of sold branches				(398,000)
Charge-offs	(7,554,000)		(11,014,000)	(15,590,000)		(30,232,000)
Recoveries	2,355,000		10,696,000	4,308,000		15,114,000
Provision for loan losses	9,827,000		(1,149,000)	28,585,000		9,813,000
Ending balance, allowance	132,974,000		133,190,000	132,974,000		133,190,000
Ending balance: individually evaluated for impairment, allowance	19,053,000		27,775,000	19,053,000		27,775,000
Ending balance: collectively evaluated for impairment, allowance	113,921,000		105,415,000	113,921,000		105,415,000
Total loans	10,247,790,000	[1]	9,727,959,000	10,247,790,000	[1]	9,727,959,000
Ending balance: individually evaluated for impairment, loans	202,899,000		284,559,000	202,899,000		284,559,000
Ending balance: collectively evaluated for impairment, loans	10,044,891,000		9,443,400,000	10,044,891,000		9,443,400,000
Retail [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance, allowance	45,570,000		43,124,000	41,479,000		38,984,000
Allowance for loan losses of sold branches				(340,000)
Charge-offs	(6,567,000)		(8,827,000)	(12,860,000)		(20,452,000)
Recoveries	1,365,000		1,758,000	4,279,000		3,528,000
Provision for loan losses	2,217,000		4,306,000	10,027,000		18,301,000
Ending balance, allowance	42,585,000		40,361,000	42,585,000		40,361,000
Ending balance: individually evaluated for impairment, allowance	961,000		1,197,000	961,000		1,197,000
Ending balance: collectively evaluated for impairment, allowance	41,624,000		39,164,000	41,624,000		39,164,000
Total loans	3,768,935,000	[1]	3,489,341,000	3,768,935,000	[1]	3,489,341,000
Ending balance: individually evaluated for impairment, loans	51,181,000		58,491,000	51,181,000		58,491,000
Ending balance: collectively evaluated for impairment, loans	3,717,754,000		3,430,850,000	3,717,754,000		3,430,850,000
Unallocated [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance, allowance	0		28,000,000	23,000,000		28,000,000
Allowance for loan losses of sold branches				0
Charge-offs	0		0	0		0
Recoveries	0		0	0		0
Provision for loan losses	0		(5,000,000)	(23,000,000)		(5,000,000)
Ending balance, allowance	0		23,000,000	0		23,000,000
Ending balance: individually evaluated for impairment, allowance	0		0	0		0
Ending balance: collectively evaluated for impairment, allowance	0		23,000,000	0		23,000,000
Total loans	0	[1]	0	0	[1]	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 $29.0 million.

[2] Total before net deferred fees and costs of