Estimated Fair Values (Tables)

6 Months Ended

Jun. 30, 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 June 30, 2012, December 31, 2011, and June 30, 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.

	June 30, 2012				December 31, 2011				June 30, 2011
	Carrying Value		Fair Value		Carrying Value		Fair Value		Carrying Value		Fair Value
Cash and due from banks	$	571,004	$	571,004	$	590,801	$	590,801	$	537,717	$	537,717
Overnight investments	984,536		984,536		434,975		434,975		741,654		741,654
Investment securities available for sale	4,634,248		4,634,248		4,056,423		4,056,423		4,014,241		4,014,241
Investment securities held to maturity	1,578		1,715		1,822		1,980		2,098		2,278
Loans held for sale	76,374		78,139		92,539		93,235		56,004		56,004
Loans covered by loss share agreements, net of allowance for loan and lease losses	1,911,554		1,873,323		2,272,891		2,236,343		2,330,303		2,318,304
Loans and leases not covered by loss share agreements, net of allowance for loan and lease losses	11,277,326		11,200,523		11,400,754		11,312,900		11,348,239		11,213,325
Receivable from FDIC for loss share agreements (1)	313,978		297,963		539,511		446,172		522,507		529,514
Income earned not collected	49,743		49,743		42,216		42,216		50,876		50,876
Stock issued by:
Federal Home Loan Bank of Atlanta	38,105		38,105		41,042		41,042		45,002		45,002
Federal Home Loan Bank of San Francisco	11,746		11,746		12,976		12,976		14,238		14,238
Federal Home Loan Bank of Seattle	4,490		4,490		4,490		4,490		4,490		4,490
Deposits	17,801,646		17,854,346		17,577,274		17,638,359		17,662,966		17,711,225
Short-term borrowings	700,299		700,299		615,222		615,222		655,808		655,808
Long-term obligations	644,682		677,372		687,599		719,999		792,661		807,407
Accrued interest payable	23,093		23,093		23,719		23,719		27,930		27,930
Interest rate swap	11,020		11,020		10,714		10,714		9,800		9,800

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 June 30, 2012, December 31, 2011, and June 30, 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)
June 30, 2012
Assets measured at fair value
Investment securities available for sale
U.S. Treasury	$	878,685	$	878,685	$	—	$	—
Government agency	2,978,198		2,978,198		—		—
Corporate bonds	50,446		50,446		—		—
Residential mortgage-backed securities	707,645		—		707,645		—
Equity securities	18,238		18,238		—		—
State, county, municipal	1,036		—		1,036		—
Total	$	4,634,248	$	3,925,567	$	708,681	$	—
Liabilities measured at fair value
Interest rate swaps accounted for as cash flow hedges	$	11,020	$	—	$	11,020	$	—
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	$	—
June 30, 2011
Assets measured at fair value
Investment securities available for sale
U.S. Treasury	$	1,289,282	$	1,289,282	$	—	$	—
Government agency	1,904,843		1,904,843		—		—
Corporate bonds	466,971		466,971		—		—
Residential mortgage-backed securities	333,483		—		333,483		—
Equity securities	18,609		18,609		—		—
State, county, municipal	1,053		—		1,053		—
Total	$	4,014,241	$	3,679,705	$	334,536	$	—
Liabilities measured at fair value
Interest rate swaps accounted for as cash flow hedges	$	9,800	$	—	$	9,800	$	—

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 June 30, 2012, December 31, 2011, and June 30, 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)
June 30, 2012
Loans held for sale	$	49,277	$	—	$	49,277	$	—
Impaired loans not covered by loss share agreements	111,288		—		—		111,288
December 31, 2011
Loans held for sale	63,470		—		63,470		—
Impaired loans not covered by loss share agreements	128,365		—		—		128,365
June 30, 2011
Loans held for sale	56,004		—		56,004		—
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- and six-month periods ended June 30, 2012 and 2011.

	Three Months Ended June 30				Six Months Ended June 30
	2012		2011		2012		2011
Current year foreclosures:
Covered under loss share agreements	$	41,098	$	68,375	$	61,630	$	109,175
Not covered under loss share agreements	12,475		19,765		18,783		13,636
Loan charge-offs recorded due to the measurement and initial recognition of OREO:
Covered under loss share agreements	7,392		7,447		8,351		7,447
Not covered under loss share agreements	130		1,385		588		2,053
Write-downs recorded subsequent to foreclosure for OREO:
Covered under loss share agreements	11,137		11,431		11,259		15,997
Not covered under loss share agreements	2,629		2,433		3,112		1,684
Fair value of OREO remeasured in current period:
Covered under loss share agreements	24,136		7,759		33,697		12,572
Not covered under loss share agreements	9,301		17,272		12,893		6,567