Estimated Fair Values (Tables)

3 Months Ended

Mar. 31, 2012

Estimated Fair Values [Abstract]

Estimated Fair Values For Certain Financial Assets And Financial Liabilities

For all other financial assets and financial liabilities, the carrying value is a reasonable estimate of the fair value as of March 31, 2012, December 31, 2011 and March 31, 2011. The carrying value and fair value for these assets and liabilities are equivalent because they are relatively short term in nature and there is no interest rate or credit risk relating to them that would cause the fair value to differ from carrying value.

	March 31, 2012				December 31, 2011				March 31, 2011
	Carrying Value		Fair Value		Carrying Value		Fair Value		Carrying Value		Fair Value
Cash and due from banks	$	552,663	$	552,663	$	590,801	$	590,801	$	406,252	$	406,252
Overnight investments	752,334		752,334		434,975		434,975		585,286		585,286
Investment securities available for sale	4,457,739		4,457,739		4,056,423		4,056,423		4,202,016		4,202,016
Investment securities held to maturity	1,688		1,844		1,822		1,980		2,341		2,537
Loans held for sale	73,457		75,342		92,539		93,235		48,222		48,222
Loans covered by loss share agreements, net of allowance for loan and lease losses	2,097,752		2,055,797		2,272,891		2,236,343		2,603,505		2,590,214
Loans and leases not covered by loss share agreements, net of allowance for loan and lease losses	11,303,146		11,171,217		11,400,754		11,312,900		11,214,383		11,062,010
Receivable from FDIC for loss share agreements (1)	410,351		297,963		539,511		446,172		624,322		557,356
Income earned not collected	52,406		52,406		42,216		42,216		98,501		98,501
Stock issued by:
Federal Home Loan Bank of Atlanta	41,043		41,043		41,042		41,042		47,123		47,123
Federal Home Loan Bank of San Francisco	12,356		12,356		12,976		12,976		14,875		14,875
Federal Home Loan Bank of Seattle	4,490		4,490		4,490		4,490		4,490		4,490
Deposits	17,759,492		17,810,831		17,577,274		17,638,359		17,811,736		17,862,769
Short-term borrowings	677,993		677,993		615,222		615,222		666,417		666,417
Long-term obligations	649,818		679,727		687,599		719,999		801,081		813,652
Accrued interest payable	21,486		21,486		23,719		23,719		27,930		27,930
Interest rate swap	10,325		10,325		10,714		10,714		7,775		7,775

Assets And Liabilities Carried At Fair Value On A Recurring Basis

For assets and liabilities carried at fair value on a recurring basis, the following table provides fair value information as of March 31, 2012, December 31, 2011 and March 31, 2011:

			Fair value measurements using:
Description	Fair value		Quoted prices in active markets for identical assets and liabilities (Level 1 inputs)		Quoted prices for similar assets and liabilities (Level 2 inputs)		Significant unobservable inputs (Level  3 inputs)
March 31, 2012
Assets measured at fair value
Investment securities available for sale
U.S. Treasury	$	1,065,036	$	1,065,036	$	—	$	—
Government agency	2,855,385		2,855,385		—		—
Corporate bonds	226,428		226,428		—		—
Residential mortgage-backed securities	290,908		—		290,908		—
Equity securities	18,943		18,943		—		—
State, county, municipal	1,039		—		1,039		—
Total	$	4,457,739	$	4,165,792	$	291,947	$	—
Liabilities measured at fair value
Interest rate swaps accounted for as cash flow hedges	$	10,325	$	—	$	10,325	$	—
December 31, 2011
Assets measured at fair value
Investment securities available for sale
U.S. Treasury	$	887,819	$	887,819	$	—	$	—
Government agency	2,592,209		2,592,209		—		—
Corporate bonds	252,820		252,820		—		—
Residential mortgage-backed securities	307,221		—		307,221		—
Equity securities	15,313		15,313		—		—
State, county, municipal	1,041		—		1,041		—
Total	$	4,056,423	$	3,748,161	$	308,262	$	—
Liabilities measured at fair value
Interest rate swaps accounted for as cash flow hedges	$	10,714	$	—	$	10,714	$	—
March 31, 2011
Assets measured at fair value
Investment securities available for sale
U.S. Treasury	$	3,565,503	$	3,565,503	$	—	$	—
Government agency	—		—		—		—
Corporate bonds	459,717		459,717		—		—
Residential mortgage-backed securities	155,922		—		155,922		—
Equity securities	19,621		19,621		—		—
State, county, municipal	1,253		—		1,253		—
Total	$	4,202,016	$	4,044,841	$	157,175	$	—
Liabilities measured at fair value
Interest rate swaps accounted for as cash flow hedges	$	7,775	$	—	$	7,775	$	—

Assets And Liabilities Carried At Fair Value On A Nonrecurring Basis

For assets and liabilities carried at fair value on a nonrecurring basis, the following table provides fair value information as of March 31, 2012, December 31, 2011 and March 31, 2011:

			Fair value measurements using:
Description	Fair value		Quoted prices in active markets for identical assets and liabilities (Level 1 inputs)		Quoted prices for similar assets and liabilities (Level 2 inputs)		Significant nonobservable inputs (Level 3 inputs)
March 31, 2012
Loans held for sale	$	45,146	$	—	$	45,146	$	—
Impaired loans not covered by loss share agreements	82,882		—		—		82,882
December 31, 2011
Loans held for sale	63,470		—		63,470		—
Impaired loans not covered by loss share agreements	128,365		—		—		128,365
March 31, 2011
Loans held for sale	48,222		—		48,222		—
Impaired loans not covered by loss share agreements	101,245		—		—		101,245

Schedule of Fair Value Measurements Of Other Real Estate Opportunites [Table Text Block]

The following table provides information regarding OREO for the three month periods ended March 31, 2012 and 2011.

	Three Months Ended March 31
	2012		2011
Current year foreclosures:
Covered under loss share agreements	$	20,532	$	40,800
Not covered under loss share agreements	6,308		6,129
Loan charge-offs recorded due to the measurement and initial recognition of OREO:
Covered under loss share agreements	959		3,787
Not covered under loss share agreements	458		668
Write-downs recorded subsequent to foreclosure for OREO:
Covered under loss share agreements	122		4,566
Not covered under loss share agreements	483		749
Fair value of OREO remeasured in current year:
Covered under loss share agreements	21,344		48,016
Not covered under loss share agreements	8,048		10,705