Loans And Allowance For Credit Losses (Summary Of Changes In The Allowance For Credit Losses) (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, 2012	Jun. 30, 2012	Mar. 31, 2012		Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Allowance for Credit Losses [Roll Forward]
Balance at beginning of period					$ 896,087						$ 1,051,685		$ 896,087		$ 1,051,685
Provision for loan losses	(30,538)		(5,573)	(21,990)	(29,035)		(10,401)		(1,889)	10,853	15,664		(87,136)		14,227		74,532
Adjustment for FDIC-supported loans													(11,237)		(14,542)
Gross loan and lease charge-offs													(130,797)		(267,189)
Recoveries													(79,374)		111,906	[1]
Net loan and lease charge-offs													(51,423)		(155,283)
Balance at end of period	746,291						896,087						746,291		896,087		1,051,685
Balance at beginning of period					106,809						102,422		106,809		102,422
Provision charged (credited) to earnings													(17,104)		4,387
Balance at end of period	89,705						106,809						89,705		106,809		102,422
Allowance for loan losses	746,291						896,087						746,291		896,087		1,051,685
Reserve for unfunded lending commitments	89,705						106,809						89,705		106,809		102,422
Total allowance for credit losses	835,996						1,002,896						835,996		1,002,896
Commercial [Member]
Allowance for Credit Losses [Roll Forward]
Balance at beginning of period					510,908						561,351		510,908		561,351
Provision for loan losses													(5,640)		16,808
Adjustment for FDIC-supported loans													0		0
Gross loan and lease charge-offs													(75,434)		(117,506)
Recoveries													(35,311)		50,255	[1]
Net loan and lease charge-offs													(40,123)		(67,251)
Balance at end of period	465,145						510,908						465,145		510,908
Balance at beginning of period					67,374						77,232		67,374		77,232
Provision charged (credited) to earnings													(19,029)		(9,858)
Balance at end of period	48,345						67,374						48,345		67,374
Allowance for loan losses	465,145						510,908						465,145		510,908
Reserve for unfunded lending commitments	48,345						67,374						48,345		67,374
Total allowance for credit losses	513,490						578,282						513,490		578,282
Commercial Real Estate [Member]
Allowance for Credit Losses [Roll Forward]
Balance at beginning of period					276,976						343,747		276,976		343,747
Provision for loan losses													(63,544)		(18,982)
Adjustment for FDIC-supported loans													0		0
Gross loan and lease charge-offs													(24,609)		(82,944)
Recoveries													(24,540)		35,155	[1]
Net loan and lease charge-offs													(69)		(47,789)
Balance at end of period	213,363						276,976						213,363		276,976
Balance at beginning of period					37,852						23,572		37,852		23,572
Provision charged (credited) to earnings													(367)		14,280
Balance at end of period	37,485						37,852						37,485		37,852
Allowance for loan losses	213,363						276,976						213,363		276,976
Reserve for unfunded lending commitments	37,485						37,852						37,485		37,852
Total allowance for credit losses	250,848						314,828						250,848		314,828
Consumer [Member]
Allowance for Credit Losses [Roll Forward]
Balance at beginning of period					95,656						123,115		95,656		123,115
Provision for loan losses													(19,100)		18,389
Adjustment for FDIC-supported loans													0		0
Gross loan and lease charge-offs													(28,960)		(60,273)
Recoveries													(13,269)		14,425	[1]
Net loan and lease charge-offs													(15,691)		(45,848)
Balance at end of period	60,865						95,656						60,865		95,656
Balance at beginning of period					1,583						1,618		1,583		1,618
Provision charged (credited) to earnings													2,292		(35)
Balance at end of period	3,875						1,583						3,875		1,583
Allowance for loan losses	60,865						95,656						60,865		95,656
Reserve for unfunded lending commitments	3,875						1,583						3,875		1,583
Total allowance for credit losses	64,740						97,239						64,740		97,239
FDIC- Supported [Member]
Allowance for Credit Losses [Roll Forward]
Balance at beginning of period					12,547	[1]					23,472	[1]	12,547	[1]	23,472	[1]
Provision for loan losses													1,148	[1]	(1,988)	[1]
Adjustment for FDIC-supported loans													(11,237)	[1]	(14,542)	[1]
Gross loan and lease charge-offs													(1,794)	[1]	(6,466)	[1]
Recoveries													(6,254)	[1]	12,071	[1]
Net loan and lease charge-offs													4,460	[1]	5,605	[1]
Balance at end of period	6,918	[1]					12,547	[1]					6,918	[1]	12,547	[1]
Balance at beginning of period					0	[1]					0	[1]	0	[1]	0	[1]
Provision charged (credited) to earnings													0	[1]	0	[1]
Balance at end of period	0	[1]					0	[1]					0	[1]	0	[1]
Allowance for loan losses	6,918	[1]					12,547	[1]					6,918	[1]	12,547	[1]
Reserve for unfunded lending commitments	0	[1]					0	[1]					0	[1]	0	[1]
Total allowance for credit losses	$ 6,918	[1]					$ 12,547	[1]					$ 6,918	[1]	$ 12,547	[1]

[1] The Purchased Loans section following contains further discussion related to FDIC-supported loans.