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				6 Months Ended
	Jun. 30, 2014		Jun. 30, 2013		Jun. 30, 2014		Jun. 30, 2013		Mar. 31, 2014		Dec. 31, 2013	Mar. 31, 2013		Dec. 31, 2012
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan and Lease Losses, Provision for Loss, Gross	$ (54,416)		$ (21,990)		$ (55,026)		$ (51,025)
Change In Allowance Covered By F D I C Indemnification	(444)		(209)		(1,261)		(7,638)
Allowance for Loan and Lease Losses, Write-offs	(23,400)		(35,099)		(44,195)		(70,566)
Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	736,953		841,781		746,291		896,087
Net loan and lease charge-offs	(6,186)		(5,670)		(14,097)		(23,512)
Balance at end of period	95,472		104,082		95,472		104,082		88,693		89,705	100,455		106,809
Allowance for loan losses	675,907		813,912		675,907		813,912
Reserve for unfunded lending commitments	95,472		104,082		95,472		104,082		88,693		89,705	100,455		106,809
Total allowance for credit losses	771,379		917,994		771,379		917,994
Allowance for Loan and Lease Losses, Recoveries of Bad Debts	17,214		29,429		30,098		47,054
Provision for Unfunded Lending Commitments	6,779		3,627		5,767		(2,727)
Balance at end of period	675,907		813,912		675,907		813,912
Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan and Lease Losses, Provision for Loss, Gross	(29,878)		(5,182)		(18,196)		(8,411)
Change In Allowance Covered By F D I C Indemnification			0				0
Allowance for Loan and Lease Losses, Write-offs	(15,003)		(18,508)		(24,127)		(36,608)
Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	474,548		496,930		465,145		510,908
Net loan and lease charge-offs	(4,436)		(5,395)		(6,715)		(16,144)
Balance at end of period	52,801		63,272		52,801		63,272		49,870		48,345	65,632		67,374
Allowance for loan losses	440,234		486,353		440,234		486,353
Reserve for unfunded lending commitments	52,801		63,272		52,801		63,272		49,870		48,345	65,632		67,374
Total allowance for credit losses	493,035		549,625		493,035		549,625
Allowance for Loan and Lease Losses, Recoveries of Bad Debts	10,567		13,113		17,412		20,464
Provision for Unfunded Lending Commitments	2,931		(2,360)		4,456		(4,102)
Balance at end of period	440,234		486,353		440,234		486,353
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan and Lease Losses, Provision for Loss, Gross	(19,348)		(11,222)		(20,915)		(29,850)
Change In Allowance Covered By F D I C Indemnification			0				0
Allowance for Loan and Lease Losses, Write-offs	(2,961)		(6,107)		(10,815)		(13,331)
Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	206,546		256,421		213,363		276,976
Net loan and lease charge-offs	63		6,079		(5,187)		4,152
Balance at end of period	38,689		39,454		38,689		39,454		35,273		37,485	33,240		37,852
Allowance for loan losses	187,261		251,278		187,261		251,278
Reserve for unfunded lending commitments	38,689		39,454		38,689		39,454		35,273		37,485	33,240		37,852
Total allowance for credit losses	225,950		290,732		225,950		290,732
Allowance for Loan and Lease Losses, Recoveries of Bad Debts	3,024		12,186		5,628		17,483
Provision for Unfunded Lending Commitments	3,416		6,214		1,204		1,602
Balance at end of period	187,261		251,278		187,261		251,278
Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan and Lease Losses, Provision for Loss, Gross	(5,232)		(8,274)		(14,100)		(13,294)
Change In Allowance Covered By F D I C Indemnification			0				0
Allowance for Loan and Lease Losses, Write-offs	(4,258)		(9,102)		(7,372)		(19,039)
Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	51,080		84,622		60,865		95,656
Net loan and lease charge-offs	(1,313)		(5,982)		(2,230)		(11,996)
Balance at end of period	3,982		1,356		3,982		1,356		3,550		3,875	1,583		1,583
Allowance for loan losses	44,535		70,366		44,535		70,366
Reserve for unfunded lending commitments	3,982		1,356		3,982		1,356		3,550		3,875	1,583		1,583
Total allowance for credit losses	48,517		71,722		48,517		71,722
Allowance for Loan and Lease Losses, Recoveries of Bad Debts	2,945		3,120		5,142		7,043
Provision for Unfunded Lending Commitments	432		(227)		107		(227)
Balance at end of period	44,535		70,366		44,535		70,366
FDIC- Supported [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan and Lease Losses, Provision for Loss, Gross	42	[1]	2,688	[1]	(1,815)		530	[1]
Change In Allowance Covered By F D I C Indemnification	(444)	[1]	(209)	[1]	(1,261)	[1]	(7,638)	[1]
Allowance for Loan and Lease Losses, Write-offs	(1,178)	[1]	(1,382)	[1]	(1,881)	[1]	(1,588)	[1]
Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	4,779	[1]	3,808	[1]	6,918	[1]	12,547	[1]
Net loan and lease charge-offs	(500)	[1]	(372)	[1]	35	[1]	476	[1]
Balance at end of period	0	[1]	0	[1]	0	[1]	0	[1]	0	[1]	0	0	[1]	0	[1]
Allowance for loan losses	3,877	[1]	5,915	[1]	3,877	[1]	5,915	[1]
Reserve for unfunded lending commitments	0	[1]	0	[1]	0	[1]	0	[1]	0	[1]	0	0	[1]	0	[1]
Total allowance for credit losses	3,877	[1]	5,915	[1]	3,877	[1]	5,915	[1]
Allowance for Loan and Lease Losses, Recoveries of Bad Debts	678	[1]	1,010	[1]	1,916	[1]	2,064	[1]
Provision for Unfunded Lending Commitments	0	[1]	0	[1]	0	[1]	0	[1]
Balance at end of period	$ 3,877	[1]	$ 5,915	[1]	$ 3,877	[1]	$ 5,915	[1]

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