Loans And Allowance For Credit Losses (Changes In The Allowance For Credit Losses) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011		Dec. 31, 2010	Dec. 31, 2009
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of year	$ 1,440,341		$ 1,531,332	$ 686,999
Provision for loan losses	74,407		852,138	2,016,927
Adjustment for FDIC-supported loans	(8,851)		39,824	2,303
Gross loan and lease charge-offs	(560,157)		(1,073,813)	(1,255,652)
Recoveries	104,218		90,860	80,755
Net loan and lease charge-offs	(455,939)		(982,953)	(1,174,897)
Balance at end of year	1,049,958		1,440,341	1,531,332
Balance at beginning of year	111,708		116,445	50,934
Provision charged (credited) to earnings	(9,286)		(4,737)	65,511
Balance at end of year	102,422		111,708	116,445
Allowance for loan losses	1,049,958		1,440,341	1,531,332
Reserve for unfunded lending commitments	102,422		111,708	116,445
Total allowance for credit losses	1,152,380		1,552,049	1,647,777
Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of year	761,107
Provision for loan losses	46,432
Gross loan and lease charge-offs	(228,026)
Recoveries	48,312
Net loan and lease charge-offs	(179,714)
Balance at end of year	627,825
Balance at beginning of year	83,352
Provision charged (credited) to earnings	(6,120)
Balance at end of year	77,232
Allowance for loan losses	627,825
Reserve for unfunded lending commitments	77,232
Total allowance for credit losses	705,057
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of year	487,235
Provision for loan losses	(21,940)
Gross loan and lease charge-offs	(223,974)
Recoveries	34,225
Net loan and lease charge-offs	(189,749)
Balance at end of year	275,546
Balance at beginning of year	26,373
Provision charged (credited) to earnings	(2,801)
Balance at end of year	23,572
Allowance for loan losses	275,546
Reserve for unfunded lending commitments	23,572
Total allowance for credit losses	299,118
Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of year	154,326
Provision for loan losses	42,720
Gross loan and lease charge-offs	(88,660)
Recoveries	14,729
Net loan and lease charge-offs	(73,931)
Balance at end of year	123,115
Balance at beginning of year	1,983
Provision charged (credited) to earnings	(365)
Balance at end of year	1,618
Allowance for loan losses	123,115
Reserve for unfunded lending commitments	1,618
Total allowance for credit losses	124,733
FDIC- Supported [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of year	37,673	[1]
Provision for loan losses	7,195	[1]
Adjustment for FDIC-supported loans	(8,851)	[1]
Gross loan and lease charge-offs	(19,497)	[1]
Recoveries	6,952	[1]
Net loan and lease charge-offs	(12,545)	[1]
Balance at end of year	23,472	[1]
Allowance for loan losses	23,472	[1]
Total allowance for credit losses	$ 23,472	[1]

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