Loans And Allowance For Credit Losses (Summary Of Changes In The Allowance For Credit Losses) (Details) (USD $)	3 Months Ended
	Mar. 31, 2014		Mar. 31, 2013		Dec. 31, 2013		Dec. 31, 2012
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan and Lease Losses, Provision for Loss, Gross	$ (610,000)		$ (29,035,000)
Change In Allowance Covered By F D I C Indemnification	(817,000)		(7,429,000)
Allowance for Loan and Lease Losses, Write-offs	(20,795,000)		(35,467,000)
Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	746,291,000		896,087,000
Net loan and lease charge-offs	(7,911,000)		(17,842,000)
Balance at end of period	88,693,000		100,455,000		89,705,000		106,809,000
Allowance for loan losses	736,953,000		841,781,000
Reserve for unfunded lending commitments	88,693,000		100,455,000		89,705,000		106,809,000
Total allowance for credit losses	825,646,000		942,236,000
Allowance for Loan and Lease Losses, Recoveries of Bad Debts	12,884,000		17,625,000
Provision for Unfunded Lending Commitments	(1,012,000)		(6,354,000)
Balance at end of period	736,953,000		841,781,000
Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan and Lease Losses, Provision for Loss, Gross	11,682,000		(3,229,000)
Change In Allowance Covered By F D I C Indemnification	0		0
Allowance for Loan and Lease Losses, Write-offs	(9,124,000)		(18,100,000)
Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	465,145,000		510,908,000
Net loan and lease charge-offs	(2,279,000)		(10,749,000)
Balance at end of period	49,870,000		65,632,000		48,345,000		67,374,000
Allowance for loan losses	474,548,000		496,930,000
Reserve for unfunded lending commitments	49,870,000		65,632,000		48,345,000		67,374,000
Total allowance for credit losses	524,418,000		562,562,000
Allowance for Loan and Lease Losses, Recoveries of Bad Debts	6,845,000		7,351,000
Provision for Unfunded Lending Commitments	1,525,000		(1,742,000)
Balance at end of period	474,548,000		496,930,000
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan and Lease Losses, Provision for Loss, Gross	(1,567,000)		(18,628,000)
Change In Allowance Covered By F D I C Indemnification	0		0
Allowance for Loan and Lease Losses, Write-offs	(7,854,000)		(7,224,000)
Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	213,363,000		276,976,000
Net loan and lease charge-offs	(5,250,000)		(1,927,000)
Balance at end of period	35,273,000		33,240,000		37,485,000		37,852,000
Allowance for loan losses	206,546,000		256,421,000
Reserve for unfunded lending commitments	35,273,000		33,240,000		37,485,000		37,852,000
Total allowance for credit losses	241,819,000		289,661,000
Allowance for Loan and Lease Losses, Recoveries of Bad Debts	2,604,000		5,297,000
Provision for Unfunded Lending Commitments	(2,212,000)		(4,612,000)
Balance at end of period	206,546,000		256,421,000
Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan and Lease Losses, Provision for Loss, Gross	(8,868,000)		(5,020,000)
Change In Allowance Covered By F D I C Indemnification	0		0
Allowance for Loan and Lease Losses, Write-offs	(3,114,000)		(9,937,000)
Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	60,865,000		95,656,000
Net loan and lease charge-offs	(917,000)		(6,014,000)
Balance at end of period	3,550,000		1,583,000		3,875,000		1,583,000
Allowance for loan losses	51,080,000		84,622,000
Reserve for unfunded lending commitments	3,550,000		1,583,000		3,875,000		1,583,000
Total allowance for credit losses	54,630,000		86,205,000
Allowance for Loan and Lease Losses, Recoveries of Bad Debts	2,197,000		3,923,000
Provision for Unfunded Lending Commitments	(325,000)		0
Balance at end of period	51,080,000		84,622,000
Federal Deposit Insurance Corporation Supported [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan and Lease Losses, Provision for Loss, Gross	(1,857,000)	[1]	(2,158,000)	[1]
Change In Allowance Covered By F D I C Indemnification	(817,000)	[1]	(7,429,000)	[1]
Allowance for Loan and Lease Losses, Write-offs	(703,000)	[1]	(206,000)	[1]
Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	6,918,000	[1]	12,547,000	[1]
Net loan and lease charge-offs	535,000	[1]	848,000	[1]
Balance at end of period	0	[1]	0	[1]	0	[1]	0	[1]
Allowance for loan losses	4,779,000	[1]	3,808,000	[1]
Reserve for unfunded lending commitments	0	[1]	0	[1]	0	[1]	0	[1]
Total allowance for credit losses	4,779,000	[1]	3,808,000	[1]
Allowance for Loan and Lease Losses, Recoveries of Bad Debts	1,238,000	[1]	1,054,000	[1]
Provision for Unfunded Lending Commitments	0	[1]	0	[1]
Balance at end of period	$ 4,779,000	[1]	$ 3,808,000	[1]

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