$EWBC
EAST WEST BANCORP INC Stock $ewbc

$ewbc Overview Financials Valuation SEC Filings Company Website

2012 Q4 Form 10-Q Financial Statement

#000110465912075416 Filed on November 07, 2012

Income Statement

Concept	2012 Q4	2012 Q3	2011 Q3
Revenue	$276.5M	$254.2M	$282.7M
YoY Change	2.83%	-10.11%
Cost Of Revenue
YoY Change
Gross Profit
YoY Change
Gross Profit Margin
Selling, General & Admin
YoY Change
% of Gross Profit
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$23.50M	$4.669M	-$16.67M
YoY Change	25.67%	-128.01%	-214.18%
% of Gross Profit
Operating Expenses
YoY Change
Operating Profit
YoY Change
Interest Expense	$31.58M	$32.25M	$44.96M
YoY Change	-20.72%	-28.26%
% of Operating Profit
Other Income/Expense, Net
YoY Change
Pretax Income	$108.2M	$105.2M	$97.69M
YoY Change	4.7%	7.7%	32.9%
Income Tax	$36.30M	$34.09M	$35.25M
% Of Pretax Income	33.55%	32.41%	36.09%
Net Earnings	$71.90M	$71.11M	$62.43M
YoY Change	8.6%	13.9%	32.83%
Net Earnings / Revenue	26.0%	27.98%	22.08%
Basic Earnings Per Share	$0.50	$0.49	$0.41
Diluted Earnings Per Share	$0.49	$0.48	$0.41
COMMON SHARES
Basic Shares Outstanding	140.3M shares	139.6M shares	147.2M shares
Diluted Shares Outstanding		145.4M shares	153.5M shares

Balance Sheet

Concept	2012 Q4	2012 Q3	2011 Q3
SHORT-TERM ASSETS
Cash & Short-Term Investments
YoY Change
Cash & Equivalents	$1.323B	$1.816B	$1.106B
Short-Term Investments
Other Short-Term Assets
YoY Change
Inventory
Prepaid Expenses
Receivables
Other Receivables
Total Short-Term Assets
YoY Change
LONG-TERM ASSETS
Property, Plant & Equipment	$107.5M	$114.6M	$119.0M
YoY Change	-9.59%	-3.67%
Goodwill	$337.4M	$337.4M	$337.4M
YoY Change	0.0%	0.0%
Intangibles
YoY Change
Long-Term Investments	$142.5M	$179.0M	$172.0M
YoY Change	50.21%	4.07%
Other Assets
YoY Change
Total Long-Term Assets
YoY Change
TOTAL ASSETS
Total Short-Term Assets
Total Long-Term Assets
Total Assets	$22.54B	$21.81B	$21.81B
YoY Change	2.58%	0.0%	6.84%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable
YoY Change
Accrued Expenses	$351.0M	$303.0M	$232.0M
YoY Change	10.38%	30.6%	-43.0%
Deferred Revenue
YoY Change
Short-Term Debt	$995.0M	$995.0M	$1.025B
YoY Change	-2.45%	-2.93%	-4.56%
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$351.0M	$303.0M	$232.0M
YoY Change	10.38%	30.6%	-43.0%
LONG-TERM LIABILITIES
Long-Term Debt	$157.0M	$137.0M	$304.0M
YoY Change	-25.94%	-54.93%	28.81%
Other Long-Term Liabilities
YoY Change
Total Long-Term Liabilities	$157.0M	$137.0M	$304.0M
YoY Change	-25.94%	-54.93%	28.81%
TOTAL LIABILITIES
Total Short-Term Liabilities	$351.0M	$303.0M	$232.0M
Total Long-Term Liabilities	$157.0M	$137.0M	$304.0M
Total Liabilities	$20.15B	$19.49B	$19.55B
YoY Change	2.53%	-0.29%	8.43%
SHAREHOLDERS EQUITY
Retained Earnings	$1.152B	$1.096B
YoY Change	23.24%
Common Stock	$157.0K
YoY Change
Preferred Stock
YoY Change
Treasury Stock (at cost)	$322.3M	$321.5M
YoY Change	177.84%
Treasury Stock Shares	16.87M shares	16.82M shares
Shareholders Equity	$2.386B	$2.318B	$2.261B
YoY Change
Total Liabilities & Shareholders Equity	$22.54B	$21.81B	$21.81B
YoY Change	2.58%	0.0%	6.84%

Cashflow Statement

Concept	2012 Q4	2012 Q3	2011 Q3
OPERATING ACTIVITIES
Net Income	$71.90M	$71.11M	$62.43M
YoY Change	8.6%	13.9%	32.83%
Depreciation, Depletion And Amortization	$23.50M	$4.669M	-$16.67M
YoY Change	25.67%	-128.01%	-214.18%
Cash From Operating Activities	$93.30M	$168.4M	-$140.5M
YoY Change	67.2%	-219.86%	-179.83%
INVESTING ACTIVITIES
Capital Expenditures	-$4.500M	-$2.400M	-$5.300M
YoY Change	50.0%	-54.72%	-31.17%
Acquisitions
YoY Change
Other Investing Activities	-$1.176B	-$923.6M	-$369.6M
YoY Change	-900.54%	149.89%	-55.6%
Cash From Investing Activities	-$1.181B	-$926.0M	-$374.9M
YoY Change	-920.36%	147.0%	-55.37%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	594.0M	144.7M	22.70M
YoY Change	372.93%	537.44%	-93.67%
NET CHANGE
Cash From Operating Activities	93.30M	168.4M	-140.5M
Cash From Investing Activities	-1.181B	-926.0M	-374.9M
Cash From Financing Activities	594.0M	144.7M	22.70M
Net Change In Cash	-493.2M	-612.9M	-492.7M
YoY Change	-251.61%	24.4%	61.28%
FREE CASH FLOW
Cash From Operating Activities	$93.30M	$168.4M	-$140.5M
Capital Expenditures	-$4.500M	-$2.400M	-$5.300M
Free Cash Flow	$97.80M	$170.8M	-$135.2M
YoY Change	66.33%	-226.33%	-173.6%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
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CY2011Q4	us-gaap	Short Term Investments ShortTermInvestments	61834000	USD
CY2012Q3	us-gaap	Federal Funds Sold FederalFundsSold	20000000	USD
CY2011Q4	us-gaap	Securities Purchased Under Agreements To Resell SecuritiesPurchasedUnderAgreementsToResell	786434000	USD
CY2011Q4	us-gaap	Available For Sale Securities AvailableForSaleSecurities	3072578000	USD
CY2011Q4	us-gaap	Loans Receivable Held For Sale Net LoansReceivableHeldForSaleNet	278603000	USD
CY2011Q4	us-gaap	Loans And Leases Receivable Net Reported Amount Covered LoansAndLeasesReceivableNetReportedAmountCovered	3923142000	USD
CY2012Q2	us-gaap	Fdic Indemnification Asset FDICIndemnificationAsset	409287000	USD
CY2011Q4	ewbc	Other Real Estate Owned Net OtherRealEstateOwnedNet	29350000	USD
CY2011Q4	ewbc	Other Real Estate Owned Covered Net OtherRealEstateOwnedCoveredNet	63624000	USD
CY2011Q4	us-gaap	Other Real Estate And Foreclosed Assets OtherRealEstateAndForeclosedAssets	92974000	USD
CY2011Q4	ewbc	Investment In Affordable Housing Partnerships InvestmentInAffordableHousingPartnerships	144445000	USD
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CY2011Q4	us-gaap	Interest Receivable InterestReceivable	89686000	USD
CY2011Q4	us-gaap	Due From Customer Acceptances DueFromCustomerAcceptances	198774000	USD
CY2011Q4	ewbc	Finite Lived Core Deposits Net FiniteLivedCoreDepositsNet	67190000	USD
CY2012Q3	us-gaap	Goodwill Goodwill	337438000	USD
CY2011Q4	us-gaap	Other Assets OtherAssets	792535000	USD
CY2011Q4	us-gaap	Assets Assets	21968667000	USD
CY2011Q4	us-gaap	Noninterest Bearing Deposit Liabilities NoninterestBearingDepositLiabilities	3492795000	USD
CY2011Q4	us-gaap	Interest Bearing Deposit Liabilities InterestBearingDepositLiabilities	13960207000	USD
CY2011Q4	us-gaap	Deposits Deposits	17453002000	USD
CY2011Q4	us-gaap	Federal Home Loan Bank Advances Long Term FederalHomeLoanBankAdvancesLongTerm	455251000	USD
CY2011Q4	us-gaap	Securities Sold Under Agreements To Repurchase SecuritiesSoldUnderAgreementsToRepurchase	1020208000	USD
CY2011Q4	us-gaap	Bank Acceptances Executed And Outstanding BankAcceptancesExecutedAndOutstanding	198774000	USD
CY2011Q4	us-gaap	Long Term Debt LongTermDebt	212178000	USD
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CY2011Q4	us-gaap	Liabilities Liabilities	19656924000	USD
CY2012Q3	us-gaap	Liabilities Liabilities	19494956000	USD
CY2012Q3	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2011Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2011Q4	us-gaap	Preferred Stock Value PreferredStockValue	83027000	USD
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	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	774574000	USD
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	us-gaap	Interest Expense InterestExpense	100591000	USD
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	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	107642000	USD
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	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	242173000	USD
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	dei	Amendment Flag AmendmentFlag	false
	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
	dei	Entity Registrant Name EntityRegistrantName	EAST WEST BANCORP INC
	dei	Entity Central Index Key EntityCentralIndexKey	0001069157
	dei	Document Type DocumentType	10-Q
	dei	Document Period End Date DocumentPeriodEndDate	2012-09-30
	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2012
	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	Q3
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	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	7647000	USD
CY2011Q3	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	2895000	USD
	us-gaap	Servicing Fees Net ServicingFeesNet	6013000	USD
CY2012Q3	us-gaap	Servicing Fees Net ServicingFeesNet	1817000	USD
	us-gaap	Servicing Fees Net ServicingFeesNet	6122000	USD
CY2011Q3	us-gaap	Servicing Fees Net ServicingFeesNet	2076000	USD
	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	2931000	USD
CY2012Q3	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	982000	USD
	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	3088000	USD
CY2011Q3	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	982000	USD
	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	16900000	USD
CY2012Q3	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	5346000	USD
	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	18753000	USD
CY2011Q3	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	5452000	USD
	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	15231000	USD
CY2012Q3	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	5717000	USD
	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	9789000	USD
CY2011Q3	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	2853000	USD
	us-gaap	Noninterest Income NoninterestIncome	9987000	USD
CY2011Q3	us-gaap	Noninterest Income NoninterestIncome	-13545000	USD
	us-gaap	Labor And Related Expense LaborAndRelatedExpense	129781000	USD
CY2012Q3	us-gaap	Labor And Related Expense LaborAndRelatedExpense	40509000	USD
	us-gaap	Labor And Related Expense LaborAndRelatedExpense	119025000	USD
CY2011Q3	us-gaap	Labor And Related Expense LaborAndRelatedExpense	39885000	USD
	us-gaap	Occupancy Net OccupancyNet	40737000	USD
CY2012Q3	us-gaap	Occupancy Net OccupancyNet	14162000	USD
	us-gaap	Occupancy Net OccupancyNet	37353000	USD
CY2011Q3	us-gaap	Occupancy Net OccupancyNet	12580000	USD
	ewbc	Amortization Of Investments In Affordable Housing Partnerships AmortizationOfInvestmentsInAffordableHousingPartnerships	12269000	USD
CY2012Q3	ewbc	Amortization Of Investments In Affordable Housing Partnerships AmortizationOfInvestmentsInAffordableHousingPartnerships	3378000	USD
	ewbc	Amortization Of Investments In Affordable Housing Partnerships AmortizationOfInvestmentsInAffordableHousingPartnerships	14410000	USD
CY2011Q3	ewbc	Amortization Of Investments In Affordable Housing Partnerships AmortizationOfInvestmentsInAffordableHousingPartnerships	5287000	USD
	ewbc	Amortization And Impairment Write Downs Of Premiums On Deposits Acquired AmortizationAndImpairmentWriteDownsOfPremiumsOnDepositsAcquired	8445000	USD
CY2012Q3	ewbc	Amortization And Impairment Write Downs Of Premiums On Deposits Acquired AmortizationAndImpairmentWriteDownsOfPremiumsOnDepositsAcquired	2734000	USD
	ewbc	Amortization And Impairment Write Downs Of Premiums On Deposits Acquired AmortizationAndImpairmentWriteDownsOfPremiumsOnDepositsAcquired	9403000	USD
CY2011Q3	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.05
	us-gaap	Loan Processing Fee LoanProcessingFee	12591000	USD
CY2011Q3	us-gaap	Loan Processing Fee LoanProcessingFee	5208000	USD
CY2011Q3	ewbc	Amortization And Impairment Write Downs Of Premiums On Deposits Acquired AmortizationAndImpairmentWriteDownsOfPremiumsOnDepositsAcquired	3067000	USD
	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	10776000	USD
CY2012Q3	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	3461000	USD
	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	16454000	USD
CY2011Q3	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	2430000	USD
	us-gaap	Loan Processing Fee LoanProcessingFee	12667000	USD
CY2012Q3	us-gaap	Loan Processing Fee LoanProcessingFee	4011000	USD
	us-gaap	Foreclosed Real Estate Expense ForeclosedRealEstateExpense	29738000	USD
	us-gaap	Foreclosed Real Estate Expense ForeclosedRealEstateExpense	18034000	USD
CY2012Q3	us-gaap	Foreclosed Real Estate Expense ForeclosedRealEstateExpense	2683000	USD
CY2011Q3	us-gaap	Foreclosed Real Estate Expense ForeclosedRealEstateExpense	4489000	USD
	us-gaap	Legal Fees LegalFees	19536000	USD
CY2012Q3	us-gaap	Legal Fees LegalFees	8213000	USD
	us-gaap	Legal Fees LegalFees	16920000	USD
CY2011Q3	us-gaap	Legal Fees LegalFees	6028000	USD
	ewbc	Prepayment Penalty For Fhlb Advances And Other Borrowings PrepaymentPenaltyForFhlbAdvancesAndOtherBorrowings	3699000	USD
CY2012Q3	ewbc	Prepayment Penalty For Fhlb Advances And Other Borrowings PrepaymentPenaltyForFhlbAdvancesAndOtherBorrowings	42000	USD
	ewbc	Prepayment Penalty For Fhlb Advances And Other Borrowings PrepaymentPenaltyForFhlbAdvancesAndOtherBorrowings	12281000	USD
CY2011Q3	ewbc	Prepayment Penalty For Fhlb Advances And Other Borrowings PrepaymentPenaltyForFhlbAdvancesAndOtherBorrowings	3826000	USD
	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	6974000	USD
CY2012Q3	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	2313000	USD
	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	6530000	USD
CY2011Q3	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	1827000	USD
	ewbc	Deposit Related Expenses DepositRelatedExpenses	4472000	USD
CY2012Q3	ewbc	Deposit Related Expenses DepositRelatedExpenses	1388000	USD
	ewbc	Deposit Related Expenses DepositRelatedExpenses	4199000	USD
CY2011Q3	ewbc	Deposit Related Expenses DepositRelatedExpenses	1667000	USD
	us-gaap	Professional Fees ProfessionalFees	5727000	USD
CY2012Q3	us-gaap	Professional Fees ProfessionalFees	2692000	USD
	us-gaap	Professional Fees ProfessionalFees	6098000	USD
CY2011Q3	us-gaap	Professional Fees ProfessionalFees	2094000	USD
	us-gaap	Other Noninterest Expense OtherNoninterestExpense	44210000	USD
CY2012Q3	us-gaap	Other Noninterest Expense OtherNoninterestExpense	15370000	USD
	us-gaap	Other Noninterest Expense OtherNoninterestExpense	43936000	USD
CY2011Q3	us-gaap	Other Noninterest Expense OtherNoninterestExpense	16164000	USD
	us-gaap	Noninterest Expense NoninterestExpense	328938000	USD
CY2011Q3	us-gaap	Noninterest Expense NoninterestExpense	104552000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	279995000	USD
CY2011Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	97685000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	100967000	USD
CY2011Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	35253000	USD
	us-gaap	Net Income Loss NetIncomeLoss	179028000	USD
CY2011Q3	us-gaap	Net Income Loss NetIncomeLoss	62432000	USD
	us-gaap	Preferred Stock Dividends And Other Adjustments PreferredStockDividendsAndOtherAdjustments	5143000	USD
CY2011Q3	us-gaap	Preferred Stock Dividends And Other Adjustments PreferredStockDividendsAndOtherAdjustments	1714000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	173885000	USD
CY2011Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	60718000	USD
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.42
CY2012Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.49
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.18
CY2011Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.41
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.40
CY2012Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.48
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.17
CY2011Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.41
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	142348000	shares
CY2012Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	139621000	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	147013000.	shares
CY2011Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	147162000	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	148051000	shares
CY2012Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	145358000	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	153372000	shares
CY2011Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	153453000	shares
	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.30
CY2012Q3	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.10
	us-gaap	Impairment Of Real Estate ImpairmentOfRealEstate	22440000	USD
	ewbc	Net Gain On Sales Of Investment Securities Loans And Other Assets NetGainOnSalesOfInvestmentSecuritiesLoansAndOtherAssets	29586000	USD
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	36627000	USD
CY2012Q3	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	15355000	USD
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-1446000	USD
CY2011Q3	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-24015000	USD
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment For Sale Of Securities Included In Net Income Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentForSaleOfSecuritiesIncludedInNetIncomeNetOfTax	-375000	USD
CY2012Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment For Sale Of Securities Included In Net Income Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentForSaleOfSecuritiesIncludedInNetIncomeNetOfTax	-54000	USD
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment For Sale Of Securities Included In Net Income Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentForSaleOfSecuritiesIncludedInNetIncomeNetOfTax	-3957000	USD
CY2011Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment For Sale Of Securities Included In Net Income Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentForSaleOfSecuritiesIncludedInNetIncomeNetOfTax	-1850000	USD
	us-gaap	Other Than Temporary Impairment Losses Investments Portion In Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent Availableforsale Securities OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParentAvailableforsaleSecurities	2938000	USD
	us-gaap	Other Than Temporary Impairment Losses Investments Portion In Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent Availableforsale Securities OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParentAvailableforsaleSecurities	2953000	USD
	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent	-900000	USD
CY2012Q3	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent	-900000	USD
	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent	-736000	USD
CY2011Q3	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent	57000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	32423000	USD
CY2012Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	14406000	USD
CY2011Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-26025000	USD
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	169847000	USD
CY2011Q3	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	36407000	USD
	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	48823000	USD
	ewbc	Accretion Amortization Of Discount And Premiums Loans And Other Assets AccretionAmortizationOfDiscountAndPremiumsLoansAndOtherAssets	162319000	USD
	ewbc	Decrease In Fdic Indemnification Asset And Receivable DecreaseInFdicIndemnificationAssetAndReceivable	-79700000	USD
	us-gaap	Share Based Compensation ShareBasedCompensation	9850000	USD
	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	64398000	USD
	us-gaap	Payments For Origination And Purchases Of Loans Held For Sale PaymentsForOriginationAndPurchasesOfLoansHeldForSale	40193000	USD
	ewbc	Proceeds From Sales Of Loans Originated As Loans Held For Sale ProceedsFromSalesOfLoansOriginatedAsLoansHeldForSale	30180000	USD
	ewbc	Net Proceeds From Fdic Shared Loss Agreements NetProceedsFromFdicSharedLossAgreements	147121000	USD
	ewbc	Net Change In Accrued Interest Receivable And Other Assets NetChangeInAccruedInterestReceivableAndOtherAssets	134500000	USD
	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	-100393000	USD
	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	-2383000	USD
	us-gaap	Adjustments To Reconcile Net Income Loss To Cash Provided By Used In Operating Activities AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities	20425000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities Continuing Operations NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	199453000	USD
	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	720348000	USD
	us-gaap	Payments For Proceeds From Short Term Investments PaymentsForProceedsFromShortTermInvestments	-77551000	USD
	us-gaap	Increase Decrease In Federal Funds Sold IncreaseDecreaseInFederalFundsSold	-30000000	USD
	us-gaap	Payments For Securities Purchased Under Agreements To Resell PaymentsForSecuritiesPurchasedUnderAgreementsToResell	1119711000	USD
	us-gaap	Payments To Acquire Available For Sale Securities PaymentsToAcquireAvailableForSaleSecurities	2464002000	USD
	us-gaap	Payments To Acquire Loans Receivable PaymentsToAcquireLoansReceivable	569946000	USD
	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	7460000	USD
	ewbc	Investments In Affordable Housing Partnerships InvestmentsInAffordableHousingPartnerships	22756000	USD
	us-gaap	Proceeds From Sale Of Available For Sale Securities ProceedsFromSaleOfAvailableForSaleSecurities	602625000	USD
	us-gaap	Proceeds From Sale Of Loans Receivable ProceedsFromSaleOfLoansReceivable	151961000	USD
	ewbc	Loans Held For Sale Originated For Investment LoansHeldForSaleOriginatedForInvestment	607291000	USD
	us-gaap	Proceeds From Sale Of Other Real Estate ProceedsFromSaleOfOtherRealEstate	135461000	USD
	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	9200000	USD
	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	1447842000	USD
	ewbc	Proceeds From Paydown Maturities And Termination Of Securities Purchased Under Resale Agreements ProceedsFromPaydownMaturitiesAndTerminationOfSecuritiesPurchasedUnderResaleAgreements	667887000	USD
	us-gaap	Payments For Proceeds From Federal Home Loan Bank Stock PaymentsForProceedsFromFederalHomeLoanBankStock	-19424000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities Continuing Operations NetCashProvidedByUsedInInvestingActivitiesContinuingOperations	-1215080000	USD
	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	1668073000	USD
	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	-58596000	USD
	us-gaap	Proceeds From Issuance Of Shares Under Incentive And Share Based Compensation Plans Including Stock Options ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions	3663000	USD
	us-gaap	Repayments Of Federal Home Loan Bank Borrowings RepaymentsOfFederalHomeLoanBankBorrowings	760274000	USD
	us-gaap	Repayments Of Other Long Term Debt RepaymentsOfOtherLongTermDebt	21918000	USD
	us-gaap	Repayments Of Notes Payable RepaymentsOfNotesPayable	6250000	USD
	us-gaap	Payments For Repurchase Of Warrants PaymentsForRepurchaseOfWarrants	14500000	USD
	us-gaap	Payments Of Ordinary Dividends PaymentsOfOrdinaryDividends	21512000	USD
	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-73000	USD
	us-gaap	Net Cash Provided By Used In Financing Activities Continuing Operations NetCashProvidedByUsedInFinancingActivitiesContinuingOperations	788613000	USD
	us-gaap	Effect Of Exchange Rate On Cash And Cash Equivalents Continuing Operations EffectOfExchangeRateOnCashAndCashEquivalentsContinuingOperations	-1047000	USD
	us-gaap	Net Cash Provided By Used In Continuing Operations NetCashProvidedByUsedInContinuingOperations	-228061000	USD
	us-gaap	Interest Paid InterestPaid	135037000	USD
	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	262988000	USD
	us-gaap	Adjustment To Additional Paid In Capital Income Tax Effect From Share Based Compensation Net AdjustmentToAdditionalPaidInCapitalIncomeTaxEffectFromShareBasedCompensationNet	461000	USD
	us-gaap	Mortgage Loan Related To Property Sales1 MortgageLoanRelatedToPropertySales1	8792000	USD
	us-gaap	Loans Assumed1 LoansAssumed1	21637000	USD
	ewbc	Loans To Facilitate Sales Of Premises And Equipment LoansToFacilitateSalesOfPremisesAndEquipment	11100000	USD
CY2010Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	1333949000	USD
CY2012Q3	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	1816372000	USD
CY2011Q3	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	1105888000	USD
CY2010Q4	us-gaap	Stockholders Equity StockholdersEquity	2113931000	USD
	us-gaap	Transfer To Other Real Estate TransferToOtherRealEstate	140987000	USD
CY2011Q3	us-gaap	Stockholders Equity StockholdersEquity	2261169000	USD
	us-gaap	Transfer To Other Real Estate TransferToOtherRealEstate	62862000	USD
CY2012Q3	ewbc	Number Of Wholly Owned Statutory Business Trusts NumberOfWhollyOwnedStatutoryBusinessTrusts	7	trust
	ewbc	More Likely Than Not Minimum Likelihood Percentage MoreLikelyThanNotMinimumLikelihoodPercentage	0.50	pure
CY2012Q3	ewbc	Percentage Of Losses Absorbed By Fdic Under Shared Loss Agreements PercentageOfLossesAbsorbedByFDICUnderSharedLossAgreements	0.80	pure
	ewbc	Percentage Of Losses Absorbed By Fdic Under Shared Loss Agreements PercentageOfLossesAbsorbedByFDICUnderSharedLossAgreements	0.80	pure
CY2012Q3	ewbc	Percentage Of Companys Liability For Losses Under Shared Loss Agreements PercentageOfCompanysLiabilityForLossesUnderSharedLossAgreements	0.20	pure
CY2011Q3	ewbc	Percentage Of Companys Liability For Losses Under Shared Loss Agreements PercentageOfCompanysLiabilityForLossesUnderSharedLossAgreements	0.20	pure
	ewbc	Percentage Of Companys Liability For Losses Under Shared Loss Agreements PercentageOfCompanysLiabilityForLossesUnderSharedLossAgreements	0.20	pure
	ewbc	Percentage Of Companys Liability For Losses Under Shared Loss Agreements PercentageOfCompanysLiabilityForLossesUnderSharedLossAgreements	0.20	pure
	ewbc	Companys Liability For Losses Under Shared Loss Agreements CompanysLiabilityForLossesUnderSharedLossAgreements	1900000	USD
	ewbc	Companys Liability For Losses Under Shared Loss Agreements CompanysLiabilityForLossesUnderSharedLossAgreements	3700000	USD
	ewbc	Total Eligible Losses Subject To Shared Loss Agreements TotalEligibleLossesSubjectToSharedLossAgreements	9300000	USD
	ewbc	Total Eligible Losses Subject To Shared Loss Agreements TotalEligibleLossesSubjectToSharedLossAgreements	18700000	USD
CY2011Q3	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	2355000	USD
CY2011Q2	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	2453000	USD
CY2012Q3	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	3849000	USD
CY2012Q2	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	2422000	USD
CY2011Q4	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	2235000	USD
CY2010Q4	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	9027000	USD
	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Earnings1 FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1	-6124000	USD
	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Earnings1 FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1	-99000	USD
CY2012Q3	ewbc	Available For Sale Securities Debt Maturities Fair Value Total AvailableForSaleSecuritiesDebtMaturitiesFairValueTotal	2237848000	USD
CY2011Q3	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Other Comprehensive Income Loss FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss	-90000	USD
CY2012Q3	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Other Comprehensive Income Loss FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss	1428000	USD
	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Other Comprehensive Income Loss FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss	8756000	USD
	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Other Comprehensive Income Loss FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss	1758000	USD
	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Sales FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales	9357000	USD
CY2011Q3	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Settlements FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements	8000	USD
CY2012Q3	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Settlements FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements	1000	USD
	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Settlements FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements	-53000	USD
	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Settlements FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements	45000	USD
	us-gaap	Fair Value Assets Measured On Recurring Basis Change In Unrealized Gain Loss Included In Investment Income FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLossIncludedInInvestmentIncome	464000	USD
	us-gaap	Fair Value Assets Measured On Recurring Basis Change In Unrealized Gain Loss Included In Investment Income FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLossIncludedInInvestmentIncome	99000	USD
CY2012Q3	ewbc	Minimum Number Of Quoted Market Prices Used In Determining Fair Value Of Available For Sale Investment Securities MinimumNumberOfQuotedMarketPricesUsedInDeterminingFairValueOfAvailableForSaleInvestmentSecurities	2	item
CY2012Q3	ewbc	Number Of Trust Preferred Securities Included In Level3 Available For Sale Securities NumberOfTrustPreferredSecuritiesIncludedInLevel3AvailableForSaleSecurities	4	item
CY2012Q3	ewbc	Percentage Of Total Available For Sale Securities Represented By Level3 Available For Sale Securities PercentageOfTotalAvailableForSaleSecuritiesRepresentedByLevel3AvailableForSaleSecurities	0.01	pure
CY2012Q3	ewbc	Number Of Quoted Market Prices Traditionally Used In Determining Fair Value Of Private Label Mortgage Backed Securities And Pooled Trust Preferred Securities NumberOfQuotedMarketPricesTraditionallyUsedInDeterminingFairValueOfPrivateLabelMortgageBackedSecuritiesAndPooledTrustPreferredSecurities	2	item
	ewbc	Noncovered Other Real Estate Owned Fair Value Disclosure NoncoveredOtherRealEstateOwnedFairValueDisclosure	40000000	USD
	ewbc	Covered Other Real Estate Owned Fair Value Disclosure CoveredOtherRealEstateOwnedFairValueDisclosure	27600000	USD
	ewbc	Maximum Term Of Maturity For Securities Purchased Under Resale Agreements To Be Included In Cash And Cash Equivalents MaximumTermOfMaturityForSecuritiesPurchasedUnderResaleAgreementsToBeIncludedInCashAndCashEquivalents	P90D
	ewbc	Term Of Maturity That Securities Purchased Under Resale Agreements Must Exceed To Be Included In Certain Fair Value Calculations TermOfMaturityThatSecuritiesPurchasedUnderResaleAgreementsMustExceedToBeIncludedInCertainFairValueCalculations	P90D
	ewbc	Maximum Term Of Maturity For Carrying Amount Of Securities Sold Under Repurchase Agreements To Approximate Fair Value MaximumTermOfMaturityForCarryingAmountOfSecuritiesSoldUnderRepurchaseAgreementsToApproximateFairValue	P90D
	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	11600000	USD
CY2012Q3	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	3800000	USD
CY2011Q3	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	3800000	USD
	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	9300000	USD
	us-gaap	Allocated Share Based Compensation Expense Net Of Tax AllocatedShareBasedCompensationExpenseNetOfTax	6700000	USD
CY2012Q3	us-gaap	Allocated Share Based Compensation Expense Net Of Tax AllocatedShareBasedCompensationExpenseNetOfTax	2200000	USD
CY2011Q3	us-gaap	Allocated Share Based Compensation Expense Net Of Tax AllocatedShareBasedCompensationExpenseNetOfTax	2200000	USD
	us-gaap	Allocated Share Based Compensation Expense Net Of Tax AllocatedShareBasedCompensationExpenseNetOfTax	5400000	USD
CY2012Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Grant ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant	4402750	shares
CY2012Q3	us-gaap	Available For Sale Securities Debt Maturities Within One Year Fair Value AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue	234661000	USD
CY2012Q3	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	435116000	USD
CY2012Q3	us-gaap	Available For Sale Securities Gross Realized Gains AvailableForSaleSecuritiesGrossRealizedGains	102000	USD
CY2011Q3	us-gaap	Available For Sale Securities Gross Realized Gains AvailableForSaleSecuritiesGrossRealizedGains	3200000	USD
	us-gaap	Available For Sale Securities Gross Realized Gains AvailableForSaleSecuritiesGrossRealizedGains	28100000	USD
	us-gaap	Available For Sale Securities Gross Realized Gains AvailableForSaleSecuritiesGrossRealizedGains	15100000	USD
CY2012Q3	us-gaap	Available For Sale Securities Gross Realized Losses AvailableForSaleSecuritiesGrossRealizedLosses	9000	USD
	us-gaap	Available For Sale Securities Gross Realized Losses AvailableForSaleSecuritiesGrossRealizedLosses	27400000	USD
	us-gaap	Available For Sale Securities Gross Realized Losses AvailableForSaleSecuritiesGrossRealizedLosses	8300000	USD
CY2012Q3	us-gaap	Available For Sale Securities Gross Realized Gain Loss Net AvailableForSaleSecuritiesGrossRealizedGainLossNet	93000	USD
CY2011Q3	us-gaap	Available For Sale Securities Gross Realized Gain Loss Net AvailableForSaleSecuritiesGrossRealizedGainLossNet	3200000	USD
CY2011Q4	us-gaap	Availableforsale Securities Gross Unrealized Gain AvailableforsaleSecuritiesGrossUnrealizedGain	47356000	USD
CY2012Q3	us-gaap	Availableforsale Securities Gross Unrealized Gain AvailableforsaleSecuritiesGrossUnrealizedGain	36205000	USD
CY2011Q4	us-gaap	Available For Sale Securities Gross Unrealized Losses1 AvailableForSaleSecuritiesGrossUnrealizedLosses1	107746000	USD
CY2012Q3	us-gaap	Available For Sale Securities Gross Unrealized Losses1 AvailableForSaleSecuritiesGrossUnrealizedLosses1	38853000	USD
CY2012Q3	us-gaap	Available For Sale Securities AvailableForSaleSecurities	2237848000	USD
	us-gaap	Incremental Common Shares Attributable To Call Options And Warrants IncrementalCommonSharesAttributableToCallOptionsAndWarrants	33000	shares
	us-gaap	Available For Sale Securities Gross Realized Gain Loss Net AvailableForSaleSecuritiesGrossRealizedGainLossNet	6800000	USD
	us-gaap	Available For Sale Securities Gross Realized Gain Loss Net AvailableForSaleSecuritiesGrossRealizedGainLossNet	647000	USD
CY2012Q3	us-gaap	Available For Sale Securities Gross Realized Gains Losses Sale Proceeds AvailableForSaleSecuritiesGrossRealizedGainsLossesSaleProceeds	32800000	USD
CY2011Q3	us-gaap	Available For Sale Securities Gross Realized Gains Losses Sale Proceeds AvailableForSaleSecuritiesGrossRealizedGainsLossesSaleProceeds	74800000	USD
	us-gaap	Available For Sale Securities Gross Realized Gains Losses Sale Proceeds AvailableForSaleSecuritiesGrossRealizedGainsLossesSaleProceeds	1130000000	USD
	us-gaap	Available For Sale Securities Gross Realized Gains Losses Sale Proceeds AvailableForSaleSecuritiesGrossRealizedGainsLossesSaleProceeds	602600000	USD
CY2011Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue	1108347000	USD
CY2012Q3	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue	235165000	USD
CY2011Q4	us-gaap	Availableforsale Securities Continuous Unrealized Loss Position Less Than12 Months Aggregate Losses2 AvailableforsaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses2	63558000	USD
CY2012Q3	us-gaap	Availableforsale Securities Continuous Unrealized Loss Position Less Than12 Months Aggregate Losses2 AvailableforsaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses2	5595000	USD
CY2011Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue	359776000	USD
CY2012Q3	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue	326664000	USD
CY2011Q4	us-gaap	Availableforsale Securities Continuous Unrealized Loss Position12 Months Or Longer Aggregate Losses2 AvailableforsaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses2	44188000	USD
CY2012Q3	us-gaap	Availableforsale Securities Continuous Unrealized Loss Position12 Months Or Longer Aggregate Losses2 AvailableforsaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses2	33258000	USD
CY2011Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue	1468123000	USD
CY2012Q3	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue	561829000	USD
CY2011Q4	us-gaap	Availableforsale Securities Continuous Unrealized Loss Position Aggregate Losses2 AvailableforsaleSecuritiesContinuousUnrealizedLossPositionAggregateLosses2	107746000	USD
CY2012Q3	us-gaap	Availableforsale Securities Continuous Unrealized Loss Position Aggregate Losses2 AvailableforsaleSecuritiesContinuousUnrealizedLossPositionAggregateLosses2	38853000	USD
CY2012Q3	ewbc	Number Of Securities In Continuous Unrealized Loss Position For More Than Twelve Months NumberOfSecuritiesInContinuousUnrealizedLossPositionForMoreThanTwelveMonths	19	item
CY2012Q3	ewbc	Number Of Individual Securities With Continuous Unrealized Loss Position NumberOfIndividualSecuritiesWithContinuousUnrealizedLossPosition	20	item
CY2012Q3	us-gaap	Available For Sale Securities Debt Maturities Within One Year Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost	238822000	USD
CY2012Q3	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost	435042000	USD
CY2012Q3	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost	541958000	USD
CY2012Q3	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost	1024674000	USD
CY2012Q3	us-gaap	Available For Sale Securities Debt Maturities Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAmortizedCost	2240496000	USD
CY2012Q3	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue	523140000	USD
CY2012Q3	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue	1044931000	USD
CY2011Q4	ewbc	Number Of Hedged Certificates Of Deposits NumberOfHedgedCertificatesOfDeposits	4	item
CY2011Q4	ewbc	Hedged Value Of Certificates Of Deposit HedgedValueOfCertificatesOfDeposit	50000000	USD
CY2012Q3	ewbc	Percentage Of Eligible Losses For Which Fdic Is Obligated To Reimburse PercentageOfEligibleLossesForWhichFdicIsObligatedToReimburse	0.80	pure
CY2012Q3	ewbc	Percentage Of Excess PercentageOfExcess	0.50	pure
CY2012Q3	ewbc	Percentage Of Intrinsic Loss Estimate PercentageOfIntrinsicLossEstimate	0.20	pure
CY2012Q3	ewbc	Percentage Of Asset Discount PercentageOfAssetDiscount	0.25	pure
CY2012Q3	ewbc	Percentage Of Cumulative Shared Loss Payments PercentageOfCumulativeSharedLossPayments	0.25	pure
CY2012Q3	ewbc	Estimated Liability That Will Be Due To Fdic For Specific Thresholds Of Losses Not Being Reached EstimatedLiabilityThatWillBeDueToFdicForSpecificThresholdsOfLossesNotBeingReached	20500000	USD
CY2011Q4	ewbc	Estimated Liability That Will Be Due To Fdic For Specific Thresholds Of Losses Not Being Reached EstimatedLiabilityThatWillBeDueToFdicForSpecificThresholdsOfLossesNotBeingReached	10700000	USD
CY2012Q3	ewbc	Additional Advances Under Shared Loss Agreements AdditionalAdvancesUnderSharedLossAgreements	466900000	USD
CY2011Q3	ewbc	Changes In Expected Cash Flows ChangesInExpectedCashFlows	49581000	USD
	ewbc	Changes In Expected Cash Flows ChangesInExpectedCashFlows	110481000	USD
	ewbc	Amount Of Loans Removed From Covered Loans AmountOfLoansRemovedFromCoveredLoans	684200000	USD
	ewbc	Loan Discount Related To Loans Removed LoanDiscountRelatedToLoansRemoved	80600000	USD
CY2012Q3	us-gaap	Fdic Indemnification Asset FDICIndemnificationAsset	368473000	USD
CY2011Q2	us-gaap	Fdic Indemnification Asset FDICIndemnificationAsset	630437000	USD
CY2011Q3	us-gaap	Fdic Indemnification Asset FDICIndemnificationAsset	569157000	USD
CY2012Q3	ewbc	Allowance Allocated To Additional Advances AllowanceAllocatedToAdditionalAdvances	5900000	USD
CY2012Q3	ewbc	Percentage Of Allowance Allocated To Additional Advances PercentageOfAllowanceAllocatedToAdditionalAdvances	0.026	pure
CY2011Q4	us-gaap	Loans And Leases Receivable Gross Carrying Amount Covered LoansAndLeasesReceivableGrossCarryingAmountCovered	4718084000	USD
CY2012Q3	us-gaap	Loans And Leases Receivable Gross Carrying Amount Covered LoansAndLeasesReceivableGrossCarryingAmountCovered	3767007000	USD
CY2011Q4	ewbc	Covered Discount CoveredDiscount	788295000	USD
CY2012Q3	ewbc	Covered Discount CoveredDiscount	582545000	USD
CY2011Q4	ewbc	Net Valuation Of Loans NetValuationOfLoans	3929789000	USD
CY2012Q3	ewbc	Net Valuation Of Loans NetValuationOfLoans	3184462000	USD
CY2012Q3	us-gaap	Loans And Leases Receivable Net Reported Amount Covered LoansAndLeasesReceivableNetReportedAmountCovered	3178585000	USD
CY2012Q3	ewbc	Covered Nonaccrual Loans CoveredNonaccrualLoans	215522000	USD
CY2011Q4	ewbc	Covered Nonaccrual Loans CoveredNonaccrualLoans	194506000	USD
CY2011Q4	ewbc	Total Nonperforming Loans TotalNonperformingLoans	194506000	USD
CY2012Q3	ewbc	Total Nonperforming Loans TotalNonperformingLoans	215522000	USD
CY2012Q3	ewbc	Other Real Estate Owned Covered Net OtherRealEstateOwnedCoveredNet	27613000	USD
CY2011Q4	ewbc	Total Covered Nonperforming Assets TotalCoveredNonperformingAssets	258130000	USD
CY2012Q3	ewbc	Total Covered Nonperforming Assets TotalCoveredNonperformingAssets	243135000	USD
CY2010Q4	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield	1153272000	USD
CY2011Q2	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield	980932000	USD
CY2011Q3	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield	880044000	USD
CY2012Q2	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield	620468000	USD
CY2012Q3	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield	538216000	USD
CY2012Q3	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield Accretion CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldAccretion	48332000	USD
CY2011Q4	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield	785165000	USD
	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield Accretion CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldAccretion	128968000	USD
CY2011Q3	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield Accretion CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldAccretion	51307000	USD
	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield Accretion CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldAccretion	162747000	USD
CY2012Q3	ewbc	Changes In Expected Cash Flows ChangesInExpectedCashFlows	33920000	USD
	ewbc	Changes In Expected Cash Flows ChangesInExpectedCashFlows	117981000	USD
CY2010Q4	us-gaap	Fdic Indemnification Asset FDICIndemnificationAsset	785035000	USD
CY2012Q3	ewbc	Accretion Accretion	-7060000	USD
	ewbc	Accretion Accretion	-24918000	USD
CY2011Q3	ewbc	Accretion Accretion	-14325000	USD
	ewbc	Accretion Accretion	-48034000	USD
CY2012Q3	ewbc	Reductions Reductions	30918000	USD
	ewbc	Reductions Reductions	107936000	USD
CY2011Q3	ewbc	Reductions Reductions	43349000	USD
	ewbc	Reductions Reductions	164238000	USD
CY2012Q3	ewbc	Fdic Repayments FdicRepayments	2836000	USD
	ewbc	Fdic Repayments FdicRepayments	9808000	USD
CY2011Q4	ewbc	Fdic Loss Sharing Receivable FdicLossSharingReceivable	76600000	USD
CY2012Q3	ewbc	Percentage Of Loan Related And Oreo Expenses Recorded As Non Interest Expense PercentageOfLoanRelatedAndOreoExpensesRecordedAsNonInterestExpense	1.00	pure
CY2012Q3	ewbc	Percentage Of Any Reimbursable Expense Recorded As Noninterest Income PercentageOfAnyReimbursableExpenseRecordedAsNoninterestIncome	0.80	pure
CY2012Q3	ewbc	Percentage Of Actual Expense Paid PercentageOfActualExpensePaid	0.20	pure
CY2012Q3	ewbc	Percentage Of Fdic In Recoveries Received PercentageOfFdicInRecoveriesReceived	0.80	pure
	ewbc	Minimum Compliance Period To Fully Utilize Tax Credits MinimumCompliancePeriodToFullyUtilizeTaxCredits	P15Y
CY2012Q3	ewbc	Investments In Affordable Housing Partnerships Amount InvestmentsInAffordableHousingPartnershipsAmount	179000000	USD
CY2011Q4	ewbc	Investments In Affordable Housing Partnerships Amount InvestmentsInAffordableHousingPartnershipsAmount	144400000	USD
CY2011Q3	us-gaap	Other Comprehensive Income Foreign Currency Translation Adjustment Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTranslationAdjustmentTaxPortionAttributableToParent	-41000	USD
CY2012Q3	ewbc	Investments In Affordable Housing Partnerships Other InvestmentsInAffordableHousingPartnershipsOther	49800000	USD
CY2011Q4	ewbc	Investments In Affordable Housing Partnerships Other InvestmentsInAffordableHousingPartnershipsOther	49700000	USD
CY2012Q3	us-gaap	Fair Value Investments Entities That Calculate Net Asset Value Per Share Unfunded Committments FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareUnfundedCommittments	87300000	USD
CY2011Q4	us-gaap	Fair Value Investments Entities That Calculate Net Asset Value Per Share Unfunded Committments FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareUnfundedCommittments	86000000	USD
CY2011Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	178600000	USD
CY2012Q3	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	-66500000	USD
CY2011Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	-59700000	USD
CY2012Q3	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	114627000	USD
CY2011Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	118926000	USD
CY2011Q4	us-gaap	Goodwill Goodwill	337438000	USD
CY2011Q3	us-gaap	Goodwill Goodwill	337438000	USD
CY2012Q3	ewbc	Market Capitalization MarketCapitalization	3090000000	USD
CY2012Q3	ewbc	Noncovered Loans Receivable Gross NoncoveredLoansReceivableGross	11155208000	USD
CY2011Q4	ewbc	Noncovered Loans Receivable Gross NoncoveredLoansReceivableGross	10288426000	USD
CY2012Q3	us-gaap	Unamortized Loan Commitment And Origination Fees And Unamortized Discounts Or Premiums UnamortizedLoanCommitmentAndOriginationFeesAndUnamortizedDiscountsOrPremiums	-15185000	USD
CY2011Q4	us-gaap	Unamortized Loan Commitment And Origination Fees And Unamortized Discounts Or Premiums UnamortizedLoanCommitmentAndOriginationFeesAndUnamortizedDiscountsOrPremiums	-16762000	USD
CY2011Q4	ewbc	Accrued Interest On Loans Receivable AccruedInterestOnLoansReceivable	68500000	USD
CY2012Q3	ewbc	Accrued Interest On Loans Receivable AccruedInterestOnLoansReceivable	73300000	USD
CY2011Q4	us-gaap	Loans Pledged As Collateral LoansPledgedAsCollateral	8650000000	USD
CY2012Q3	us-gaap	Loans Pledged As Collateral LoansPledgedAsCollateral	8820000000	USD
CY2012Q3	ewbc	Noncovered Commercial Real Estate Loans And Noncovered Residential Loans Secured By Real Properties Located In California Concentration Risk Percentage NoncoveredCommercialRealEstateLoansAndNoncoveredResidentialLoansSecuredByRealPropertiesLocatedInCaliforniaConcentrationRiskPercentage	0.90	pure
	ewbc	Loans Acquired During Period LoansAcquiredDuringPeriod	451700000	USD
	ewbc	Carrying Amount Of Loans Acquired CarryingAmountOfLoansAcquired	429800000	USD
CY2012Q3	ewbc	Percentage Of Purchased Loans Classified As Student Loans PercentageOfPurchasedLoansClassifiedAsStudentLoans	0.98	pure
CY2012Q3	us-gaap	Loans Receivable Held For Sale Net LoansReceivableHeldForSaleNet	157869000	USD
CY2012Q3	ewbc	Percentage Of Loans Held For Sale That Were Originally Classified As Student Loans PercentageOfLoansHeldForSaleThatWereOriginallyClassifiedAsStudentLoans	0.94	pure
	us-gaap	Proceeds From Sale Of Loans Held For Sale ProceedsFromSaleOfLoansHeldForSale	338000000	USD
	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	-100082000	USD
	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	-49343000	USD
	us-gaap	Proceeds From Sale Of Loans Held For Sale ProceedsFromSaleOfLoansHeldForSale	637500000	USD
	us-gaap	Gain Loss On Sale Of Loans And Leases GainLossOnSaleOfLoansAndLeases	14600000	USD
	us-gaap	Gain Loss On Sale Of Loans And Leases GainLossOnSaleOfLoansAndLeases	14500000	USD
CY2012Q3	ewbc	Number Of Grades Risk Rating System NumberOfGradesRiskRatingSystem	8	item
	ewbc	Maximum Term Loan Graded Special Mention MaximumTermLoanGradedSpecialMention	P6M
CY2011Q4	ewbc	Financing Receivable Recorded Investment Non Covered Loans And Loans Held For Sale Net FinancingReceivableRecordedInvestmentNonCoveredLoansAndLoansHeldForSaleNet	10550267000	USD
CY2012Q3	ewbc	Financing Receivable Recorded Investment Non Covered Loans And Loans Held For Sale Net FinancingReceivableRecordedInvestmentNonCoveredLoansAndLoansHeldForSaleNet	11297892000	USD
CY2011Q4	us-gaap	Financing Receivable Recorded Investment30 To59 Days Past Due FinancingReceivableRecordedInvestment30To59DaysPastDue	33117000	USD
CY2012Q3	us-gaap	Financing Receivable Recorded Investment30 To59 Days Past Due FinancingReceivableRecordedInvestment30To59DaysPastDue	28302000	USD
CY2011Q4	us-gaap	Financing Receivable Recorded Investment60 To89 Days Past Due FinancingReceivableRecordedInvestment60To89DaysPastDue	7210000	USD
CY2012Q3	us-gaap	Financing Receivable Recorded Investment60 To89 Days Past Due FinancingReceivableRecordedInvestment60To89DaysPastDue	16406000	USD
CY2011Q4	ewbc	Financing Receivable Past Due And Still Accruing FinancingReceivablePastDueAndStillAccruing	40327000	USD
CY2012Q3	ewbc	Financing Receivable Past Due And Still Accruing FinancingReceivablePastDueAndStillAccruing	44708000	USD
CY2011Q4	ewbc	Financing Receivable Less Than90 Days Past Due And Not Accruing FinancingReceivableLessThan90DaysPastDueAndNotAccruing	45786000	USD
CY2012Q3	ewbc	Financing Receivable Less Than90 Days Past Due And Not Accruing FinancingReceivableLessThan90DaysPastDueAndNotAccruing	20821000	USD
CY2011Q4	ewbc	Financing Receivable90 Days Or More Past Due And Not Accruing FinancingReceivable90DaysOrMorePastDueAndNotAccruing	99846000	USD
CY2012Q3	ewbc	Financing Receivable90 Days Or More Past Due And Not Accruing FinancingReceivable90DaysOrMorePastDueAndNotAccruing	83271000	USD
CY2011Q4	ewbc	Financing Receivable Not Accruing FinancingReceivableNotAccruing	145632000	USD
CY2012Q3	ewbc	Financing Receivable Not Accruing FinancingReceivableNotAccruing	104092000	USD
CY2011Q4	us-gaap	Financing Receivable Recorded Investment Current FinancingReceivableRecordedInvestmentCurrent	10381070000	USD
CY2012Q3	us-gaap	Financing Receivable Recorded Investment Current FinancingReceivableRecordedInvestmentCurrent	11164277000	USD
CY2011Q4	ewbc	Financing Receivable Non Covered Loans And Loans Held For Sale Gross FinancingReceivableNonCoveredLoansAndLoansHeldForSaleGross	10567029000	USD
CY2012Q3	ewbc	Financing Receivable Non Covered Loans And Loans Held For Sale Gross FinancingReceivableNonCoveredLoansAndLoansHeldForSaleGross	11313077000	USD
CY2012Q3	ewbc	Loans Receivable Nonaccrual Of Interest On Nonaccrual Loans LoansReceivableNonaccrualOfInterestOnNonaccrualLoans	1497000	USD
	ewbc	Loans Receivable Nonaccrual Of Interest On Nonaccrual Loans LoansReceivableNonaccrualOfInterestOnNonaccrualLoans	4994000	USD
CY2011Q3	ewbc	Loans Receivable Nonaccrual Of Interest On Nonaccrual Loans LoansReceivableNonaccrualOfInterestOnNonaccrualLoans	2360000	USD
	ewbc	Loans Receivable Nonaccrual Of Interest On Nonaccrual Loans LoansReceivableNonaccrualOfInterestOnNonaccrualLoans	7923000	USD
CY2012Q3	ewbc	Loans Receivable Interest Recognized On Nonaccrual Loans LoansReceivableInterestRecognizedOnNonaccrualLoans	633000	USD
	ewbc	Loans Receivable Interest Recognized On Nonaccrual Loans LoansReceivableInterestRecognizedOnNonaccrualLoans	1526000	USD
CY2011Q3	ewbc	Loans Receivable Interest Recognized On Nonaccrual Loans LoansReceivableInterestRecognizedOnNonaccrualLoans	756000	USD
	ewbc	Loans Receivable Interest Recognized On Nonaccrual Loans LoansReceivableInterestRecognizedOnNonaccrualLoans	2267000	USD
CY2012Q3	ewbc	Loans And Leases Receivable Interest Lost On Nonaccrual Loans LoansAndLeasesReceivableInterestLostOnNonaccrualLoans	864000	USD
	ewbc	Loans And Leases Receivable Interest Lost On Nonaccrual Loans LoansAndLeasesReceivableInterestLostOnNonaccrualLoans	3468000	USD
CY2011Q3	ewbc	Loans And Leases Receivable Interest Lost On Nonaccrual Loans LoansAndLeasesReceivableInterestLostOnNonaccrualLoans	1604000	USD
	ewbc	Loans And Leases Receivable Interest Lost On Nonaccrual Loans LoansAndLeasesReceivableInterestLostOnNonaccrualLoans	5656000	USD
	ewbc	Financing Receivable Restructured Note Split Number FinancingReceivableRestructuredNoteSplitNumber	2	item
	ewbc	Financing Receivable Number Of Payment Months Considered Sustained Period Of Performance FinancingReceivableNumberOfPaymentMonthsConsideredSustainedPeriodOfPerformance	P6M
CY2012Q3	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	-4669000	USD
CY2011Q4	us-gaap	Impaired Financing Receivable Unpaid Principal Balance ImpairedFinancingReceivableUnpaidPrincipalBalance	279181000	USD
CY2012Q3	us-gaap	Impaired Financing Receivable Unpaid Principal Balance ImpairedFinancingReceivableUnpaidPrincipalBalance	208761000	USD
CY2012Q3	us-gaap	Impaired Financing Receivable With Related Allowance Recorded Investment ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment	33079000	USD
CY2011Q4	ewbc	Percentage Of Allowance For Loan Losses Allocated To Covered Loans PercentageOfAllowanceForLoanLossesAllocatedToCoveredLoans	0.031	pure
CY2011Q4	us-gaap	Impaired Financing Receivable With No Related Allowance Recorded Investment ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment	189175000	USD
CY2012Q3	us-gaap	Impaired Financing Receivable With No Related Allowance Recorded Investment ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment	141843000	USD
CY2011Q4	us-gaap	Impaired Financing Receivable With Related Allowance Recorded Investment ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment	30405000	USD
CY2012Q3	ewbc	Percentage Of Allowance For Loan Losses Allocated To Covered Loans PercentageOfAllowanceForLoanLossesAllocatedToCoveredLoans	0.026	pure
CY2011Q4	us-gaap	Impaired Financing Receivable Recorded Investment ImpairedFinancingReceivableRecordedInvestment	219580000	USD
CY2012Q3	us-gaap	Impaired Financing Receivable Recorded Investment ImpairedFinancingReceivableRecordedInvestment	174922000	USD
CY2011Q4	us-gaap	Impaired Financing Receivable Related Allowance ImpairedFinancingReceivableRelatedAllowance	13041000	USD
CY2012Q3	us-gaap	Impaired Financing Receivable Related Allowance ImpairedFinancingReceivableRelatedAllowance	10200000	USD
CY2011	us-gaap	Impaired Financing Receivable Average Recorded Investment ImpairedFinancingReceivableAverageRecordedInvestment	252418000	USD
CY2012Q3	us-gaap	Impaired Financing Receivable Average Recorded Investment ImpairedFinancingReceivableAverageRecordedInvestment	182024000	USD
	us-gaap	Impaired Financing Receivable Interest Income Cash Basis Method ImpairedFinancingReceivableInterestIncomeCashBasisMethod	1526000	USD
CY2012Q3	us-gaap	Impaired Financing Receivable Interest Income Cash Basis Method ImpairedFinancingReceivableInterestIncomeCashBasisMethod	633000	USD
	us-gaap	Impaired Financing Receivable Average Recorded Investment ImpairedFinancingReceivableAverageRecordedInvestment	192051000	USD
CY2011	us-gaap	Impaired Financing Receivable Interest Income Cash Basis Method ImpairedFinancingReceivableInterestIncomeCashBasisMethod	3519000	USD
	us-gaap	Number Of Operating Segments NumberOfOperatingSegments	3	Segment
CY2012Q1	ewbc	Modification Cost ModificationCost	37700000	USD
CY2012Q1	ewbc	Federal Home Loan Bank Advances General Debt Obligations Disclosures Interest Rate At Period End Before Modification FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresInterestRateAtPeriodEndBeforeModification	0.0227	pure
CY2012Q1	us-gaap	Federal Home Loan Bank Advances General Debt Obligations Disclosures Interest Rate At Period End FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresInterestRateAtPeriodEnd	0.0136	pure
CY2012Q3	us-gaap	Advances From Federal Home Loan Banks AdvancesFromFederalHomeLoanBanks	363100000	USD
CY2012Q1	ewbc	Federal Home Loan Bank Advances Fixed Rate Modified FederalHomeLoanBankAdvancesFixedRateModified	300000000	USD
CY2011	ewbc	Financing Receivable Allowance For Credit Losses Allowance For Unfunded Loan Commitments And Letters Of Credit FinancingReceivableAllowanceForCreditLossesAllowanceForUnfundedLoanCommitmentsAndLettersOfCredit	1048000	USD
	ewbc	Financing Receivable Allowance For Credit Losses Allowance For Unfunded Loan Commitments And Letters Of Credit FinancingReceivableAllowanceForCreditLossesAllowanceForUnfundedLoanCommitmentsAndLettersOfCredit	2000	USD
CY2012Q3	ewbc	Financing Receivable Allowance For Credit Losses Allowance For Unfunded Loan Commitments And Letters Of Credit FinancingReceivableAllowanceForCreditLossesAllowanceForUnfundedLoanCommitmentsAndLettersOfCredit	-1502000	USD
CY2011	us-gaap	Allowance For Loan And Lease Losses Provision For Loss Gross AllowanceForLoanAndLeaseLossesProvisionForLossGross	124691000	USD
	us-gaap	Allowance For Loan And Lease Losses Provision For Loss Gross AllowanceForLoanAndLeaseLossesProvisionForLossGross	52559000	USD
CY2012Q3	us-gaap	Allowance For Loan And Lease Losses Provision For Loss Gross AllowanceForLoanAndLeaseLossesProvisionForLossGross	20955000	USD
CY2011	us-gaap	Allowance For Loan And Lease Losses Recoveries Of Bad Debts AllowanceForLoanAndLeaseLossesRecoveriesOfBadDebts	12623000	USD
	us-gaap	Allowance For Loan And Lease Losses Recoveries Of Bad Debts AllowanceForLoanAndLeaseLossesRecoveriesOfBadDebts	13452000	USD
CY2012Q3	us-gaap	Allowance For Loan And Lease Losses Recoveries Of Bad Debts AllowanceForLoanAndLeaseLossesRecoveriesOfBadDebts	3840000	USD
	us-gaap	Allowance For Loan And Lease Losses Provision For Loss Net AllowanceForLoanAndLeaseLossesProvisionForLossNet	39107000	USD
CY2011Q4	us-gaap	Financing Receivable Individually Evaluated For Impairment FinancingReceivableIndividuallyEvaluatedForImpairment	220613000	USD
CY2012Q3	us-gaap	Financing Receivable Individually Evaluated For Impairment FinancingReceivableIndividuallyEvaluatedForImpairment	174853000	USD
CY2011	us-gaap	Allowance For Loan And Lease Losses Provision For Loss Net AllowanceForLoanAndLeaseLossesProvisionForLossNet	112068000	USD
CY2012Q3	us-gaap	Allowance For Loan And Lease Losses Provision For Loss Net AllowanceForLoanAndLeaseLossesProvisionForLossNet	17115000	USD
CY2011Q4	us-gaap	Financing Receivable Allowance For Credit Losses Individually Evaluated For Impairment1 FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1	13041000	USD
CY2012Q3	us-gaap	Financing Receivable Allowance For Credit Losses Individually Evaluated For Impairment1 FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1	10200000	USD
CY2011Q4	us-gaap	Financing Receivable Allowance For Credit Losses Collectively Evaluated For Impairment FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment	203482000	USD
CY2012Q3	us-gaap	Financing Receivable Allowance For Credit Losses Collectively Evaluated For Impairment FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment	219314000	USD
CY2011Q4	ewbc	Allowance For Unfunded Loan Commitments Off Balance Sheet Credit Exposures And Recourse Provisions AllowanceForUnfundedLoanCommitmentsOffBalanceSheetCreditExposuresAndRecourseProvisions	11000000	USD
CY2011Q4	us-gaap	Financing Receivable Collectively Evaluated For Impairment FinancingReceivableCollectivelyEvaluatedForImpairment	10651617000	USD
CY2012Q3	us-gaap	Financing Receivable Collectively Evaluated For Impairment FinancingReceivableCollectivelyEvaluatedForImpairment	11442156000	USD
CY2012Q3	ewbc	Allowance For Unfunded Loan Commitments Off Balance Sheet Credit Exposures And Recourse Provisions AllowanceForUnfundedLoanCommitmentsOffBalanceSheetCreditExposuresAndRecourseProvisions	11000000	USD
CY2011Q4	us-gaap	Financing Receivable Acquired With Deteriorated Credit Quality FinancingReceivableAcquiredWithDeterioratedCreditQuality	4134280000	USD
CY2011Q4	us-gaap	Loans And Leases Receivable Gross Carrying Amount LoansAndLeasesReceivableGrossCarryingAmount	15006510000	USD
CY2012Q3	us-gaap	Loans And Leases Receivable Gross Carrying Amount LoansAndLeasesReceivableGrossCarryingAmount	14922215000	USD
CY2011Q4	us-gaap	Qualitative And Quantitative Information Asset Or Liability Transferors Continuing Involvement Securitization Or Assetbacked Financing Principal Amount Outstanding Derecognized Amount QualitativeAndQuantitativeInformationAssetOrLiabilityTransferorsContinuingInvolvementSecuritizationOrAssetbackedFinancingPrincipalAmountOutstandingDerecognizedAmount	2100000000	USD
CY2012Q3	us-gaap	Qualitative And Quantitative Information Asset Or Liability Transferors Continuing Involvement Securitization Or Assetbacked Financing Principal Amount Outstanding Derecognized Amount QualitativeAndQuantitativeInformationAssetOrLiabilityTransferorsContinuingInvolvementSecuritizationOrAssetbackedFinancingPrincipalAmountOutstandingDerecognizedAmount	1740000000	USD
CY2011Q4	ewbc	Portion Of Allowance For Unfunded Loan Commitments Off Balance Sheet Credit Exposures And Recourse Provisions Related To Off Balance Sheet Loans Serviced For Others PortionOfAllowanceForUnfundedLoanCommitmentsOffBalanceSheetCreditExposuresAndRecourseProvisionsRelatedToOffBalanceSheetLoansServicedForOthers	4400000	USD
CY2012Q3	ewbc	Portion Of Allowance For Unfunded Loan Commitments Off Balance Sheet Credit Exposures And Recourse Provisions Related To Off Balance Sheet Loans Serviced For Others PortionOfAllowanceForUnfundedLoanCommitmentsOffBalanceSheetCreditExposuresAndRecourseProvisionsRelatedToOffBalanceSheetLoansServicedForOthers	5300000	USD
CY2011Q4	ewbc	Other Commitments OtherCommitments	86000000	USD
CY2012Q3	ewbc	Other Commitments OtherCommitments	87300000	USD
CY2011Q4	us-gaap	Advances From Federal Home Loan Banks AdvancesFromFederalHomeLoanBanks	455300000	USD
CY2012Q3	ewbc	Number Of Business Divisions NumberOfBusinessDivisions	3	Segment
CY2012Q3	ewbc	Number Of Segment Whom Broad Administrative Support Provided NumberOfSegmentWhomBroadAdministrativeSupportProvided	2	Segment
CY2011Q3	us-gaap	Assets Assets	21813046000	USD
	us-gaap	Treasury Stock Acquired Average Cost Per Share TreasuryStockAcquiredAverageCostPerShare	22.02
CY2012Q3	us-gaap	Income Loss Before Extraordinary Items And Cumulative Effect Of Change In Accounting Principle IncomeLossBeforeExtraordinaryItemsAndCumulativeEffectOfChangeInAccountingPrinciple	71110000	USD
CY2011Q3	us-gaap	Income Loss Before Extraordinary Items And Cumulative Effect Of Change In Accounting Principle IncomeLossBeforeExtraordinaryItemsAndCumulativeEffectOfChangeInAccountingPrinciple	62432000	USD
	us-gaap	Income Loss Before Extraordinary Items And Cumulative Effect Of Change In Accounting Principle IncomeLossBeforeExtraordinaryItemsAndCumulativeEffectOfChangeInAccountingPrinciple	209750000	USD
	us-gaap	Income Loss Before Extraordinary Items And Cumulative Effect Of Change In Accounting Principle IncomeLossBeforeExtraordinaryItemsAndCumulativeEffectOfChangeInAccountingPrinciple	179028000	USD
CY2012Q3	us-gaap	Participating Securities Distributed And Undistributed Earnings ParticipatingSecuritiesDistributedAndUndistributedEarnings	798000	USD
	us-gaap	Participating Securities Distributed And Undistributed Earnings ParticipatingSecuritiesDistributedAndUndistributedEarnings	2518000	USD
CY2012Q3	ewbc	Net Income Loss Available To Common Stockholders Basic After Participating Securities NetIncomeLossAvailableToCommonStockholdersBasicAfterParticipatingSecurities	68598000	USD
CY2011Q3	ewbc	Net Income Loss Available To Common Stockholders Basic After Participating Securities NetIncomeLossAvailableToCommonStockholdersBasicAfterParticipatingSecurities	60718000	USD
	ewbc	Net Income Loss Available To Common Stockholders Basic After Participating Securities NetIncomeLossAvailableToCommonStockholdersBasicAfterParticipatingSecurities	202090000	USD
	ewbc	Net Income Loss Available To Common Stockholders Basic After Participating Securities NetIncomeLossAvailableToCommonStockholdersBasicAfterParticipatingSecurities	173885000	USD
CY2012Q3	ewbc	Amount Of Dilutive Securities Restrictive Stock Awards AmountOfDilutiveSecuritiesRestrictiveStockAwards	14000	USD
CY2011Q3	ewbc	Amount Of Dilutive Securities Restrictive Stock Awards AmountOfDilutiveSecuritiesRestrictiveStockAwards	34000	USD
	ewbc	Amount Of Dilutive Securities Restrictive Stock Awards AmountOfDilutiveSecuritiesRestrictiveStockAwards	29000	USD
	ewbc	Amount Of Dilutive Securities Restrictive Stock Awards AmountOfDilutiveSecuritiesRestrictiveStockAwards	75000	USD
CY2012Q3	ewbc	Amount Of Dilutive Securities Convertible Preferred Stock AmountOfDilutiveSecuritiesConvertiblePreferredStock	1714000	USD
CY2011Q3	ewbc	Amount Of Dilutive Securities Convertible Preferred Stock AmountOfDilutiveSecuritiesConvertiblePreferredStock	1714000	USD
	ewbc	Amount Of Dilutive Securities Convertible Preferred Stock AmountOfDilutiveSecuritiesConvertiblePreferredStock	5142000	USD
	ewbc	Amount Of Dilutive Securities Convertible Preferred Stock AmountOfDilutiveSecuritiesConvertiblePreferredStock	5143000	USD
CY2012Q3	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	70326000	USD
CY2011Q3	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	62466000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	207261000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	179103000	USD
	ewbc	Incremental Common Shares Attributable To Share Based Payment Arrangements Stock Options IncrementalCommonSharesAttributableToShareBasedPaymentArrangementsStockOptions	36000	shares
CY2012Q3	ewbc	Incremental Common Shares Attributable To Share Based Payment Arrangements Stock Options IncrementalCommonSharesAttributableToShareBasedPaymentArrangementsStockOptions	28000	shares
	ewbc	Incremental Common Shares Attributable To Share Based Payment Arrangements Stock Options IncrementalCommonSharesAttributableToShareBasedPaymentArrangementsStockOptions	74000	shares
CY2011Q3	ewbc	Incremental Common Shares Attributable To Share Based Payment Arrangements Stock Options IncrementalCommonSharesAttributableToShareBasedPaymentArrangementsStockOptions	37000	shares
	ewbc	Incremental Common Shares Attributable To Share Based Payment Arrangements Restricted Stock IncrementalCommonSharesAttributableToShareBasedPaymentArrangementsRestrictedStock	96000	shares
CY2012Q3	ewbc	Incremental Common Shares Attributable To Share Based Payment Arrangements Restricted Stock IncrementalCommonSharesAttributableToShareBasedPaymentArrangementsRestrictedStock	138000	shares
	ewbc	Incremental Common Shares Attributable To Share Based Payment Arrangements Restricted Stock IncrementalCommonSharesAttributableToShareBasedPaymentArrangementsRestrictedStock	681000	shares
CY2011Q3	ewbc	Incremental Common Shares Attributable To Share Based Payment Arrangements Restricted Stock IncrementalCommonSharesAttributableToShareBasedPaymentArrangementsRestrictedStock	683000	shares
	us-gaap	Incremental Common Shares Attributable To Conversion Of Preferred Stock IncrementalCommonSharesAttributableToConversionOfPreferredStock	5571000	shares
CY2012Q3	us-gaap	Incremental Common Shares Attributable To Conversion Of Preferred Stock IncrementalCommonSharesAttributableToConversionOfPreferredStock	5571000	shares
	us-gaap	Incremental Common Shares Attributable To Conversion Of Preferred Stock IncrementalCommonSharesAttributableToConversionOfPreferredStock	5571000	shares
CY2011Q3	us-gaap	Incremental Common Shares Attributable To Conversion Of Preferred Stock IncrementalCommonSharesAttributableToConversionOfPreferredStock	5571000	shares
CY2012Q3	us-gaap	Accumulated Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-1500000	USD
CY2011Q3	us-gaap	Accumulated Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-22300000	USD
CY2011Q3	us-gaap	Accumulated Other Comprehensive Income Loss Foreign Currency Translation Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax	928000	USD
CY2010Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-12414000	USD
CY2012Q3	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-1517000	USD
CY2011Q3	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-21595000	USD
	us-gaap	Other Comprehensive Income Loss Before Tax OtherComprehensiveIncomeLossBeforeTax	32423000	USD
CY2012Q3	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	26474000	USD
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	-2493000	USD
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	63150000	USD
CY2011Q3	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	-41405000	USD
CY2012Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment For Sale Of Securities Included In Net Income Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentForSaleOfSecuritiesIncludedInNetIncomeBeforeTax	-93000	USD
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment For Sale Of Securities Included In Net Income Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentForSaleOfSecuritiesIncludedInNetIncomeBeforeTax	-6823000	USD
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment For Sale Of Securities Included In Net Income Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentForSaleOfSecuritiesIncludedInNetIncomeBeforeTax	-647000	USD
CY2011Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment For Sale Of Securities Included In Net Income Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentForSaleOfSecuritiesIncludedInNetIncomeBeforeTax	-3191000	USD
CY2012Q3	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Before Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentBeforeTaxPortionAttributableToParent	26381000	USD
	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Before Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentBeforeTaxPortionAttributableToParent	-9316000	USD
	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Before Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentBeforeTaxPortionAttributableToParent	62503000	USD
CY2011Q3	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Before Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentBeforeTaxPortionAttributableToParent	-44596000	USD
CY2012Q3	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Before Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentBeforeTaxPortionAttributableToParent	-1552000	USD
	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Before Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentBeforeTaxPortionAttributableToParent	-1269000	USD
	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Before Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentBeforeTaxPortionAttributableToParent	-1552000	USD
CY2011Q3	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Before Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentBeforeTaxPortionAttributableToParent	98000	USD
CY2012Q3	us-gaap	Other Comprehensive Income Loss Before Tax Portion Attributable To Parent OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent	24838000	USD
	us-gaap	Other Comprehensive Income Loss Before Tax Portion Attributable To Parent OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent	-15829000	USD
	us-gaap	Other Comprehensive Income Loss Before Tax Portion Attributable To Parent OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent	55901000	USD
CY2011Q3	us-gaap	Other Comprehensive Income Loss Before Tax Portion Attributable To Parent OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent	-44872000	USD
CY2012Q3	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	-11119000	USD
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	1047000	USD
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	-26523000	USD
CY2011Q3	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	17390000	USD
CY2012Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment For Sale Of Securities Included In Net Income Tax OtherComprehensiveIncomeLossReclassificationAdjustmentForSaleOfSecuritiesIncludedInNetIncomeTax	39000	USD
CY2012Q3	us-gaap	Other Comprehensive Income Availableforsale Securities Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesTaxPortionAttributableToParent	-11080000	USD
	us-gaap	Other Comprehensive Income Availableforsale Securities Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesTaxPortionAttributableToParent	3913000	USD
	us-gaap	Other Comprehensive Income Availableforsale Securities Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesTaxPortionAttributableToParent	-26251000	USD
CY2011Q3	us-gaap	Other Comprehensive Income Availableforsale Securities Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesTaxPortionAttributableToParent	18731000	USD
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment For Sale Of Securities Included In Net Income Tax OtherComprehensiveIncomeLossReclassificationAdjustmentForSaleOfSecuritiesIncludedInNetIncomeTax	2866000	USD
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment For Sale Of Securities Included In Net Income Tax OtherComprehensiveIncomeLossReclassificationAdjustmentForSaleOfSecuritiesIncludedInNetIncomeTax	272000	USD
CY2011Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment For Sale Of Securities Included In Net Income Tax OtherComprehensiveIncomeLossReclassificationAdjustmentForSaleOfSecuritiesIncludedInNetIncomeTax	1341000	USD
CY2012Q3	us-gaap	Other Comprehensive Income Foreign Currency Translation Adjustment Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTranslationAdjustmentTaxPortionAttributableToParent	652000	USD
	us-gaap	Other Comprehensive Income Foreign Currency Translation Adjustment Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTranslationAdjustmentTaxPortionAttributableToParent	533000	USD
	us-gaap	Other Comprehensive Income Foreign Currency Translation Adjustment Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTranslationAdjustmentTaxPortionAttributableToParent	652000	USD
CY2012Q3	us-gaap	Other Comprehensive Income Loss Tax Portion Attributable To Parent1 OtherComprehensiveIncomeLossTaxPortionAttributableToParent1	-10432000	USD
	us-gaap	Other Comprehensive Income Loss Tax Portion Attributable To Parent1 OtherComprehensiveIncomeLossTaxPortionAttributableToParent1	6648000	USD
	us-gaap	Other Comprehensive Income Loss Tax Portion Attributable To Parent1 OtherComprehensiveIncomeLossTaxPortionAttributableToParent1	-23478000	USD
CY2011Q3	us-gaap	Other Comprehensive Income Loss Tax Portion Attributable To Parent1 OtherComprehensiveIncomeLossTaxPortionAttributableToParent1	18847000	USD
	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent	36252000	USD
CY2012Q3	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent	15301000	USD
	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent	-5403000	USD
CY2011Q3	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent	-25865000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-9181000	USD
	us-gaap	Other Comprehensive Income Loss Before Tax OtherComprehensiveIncomeLossBeforeTax	-9181000	USD
	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	58978000	USD
	ewbc	Accretion Amortization Of Discount And Premiums Loans And Other Assets AccretionAmortizationOfDiscountAndPremiumsLoansAndOtherAssets	152297000	USD
	ewbc	Decrease In Fdic Indemnification Asset And Receivable DecreaseInFdicIndemnificationAssetAndReceivable	-72520000	USD
	us-gaap	Share Based Compensation ShareBasedCompensation	12137000	USD
	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	12131000	USD
	us-gaap	Impairment Of Real Estate ImpairmentOfRealEstate	13342000	USD
	ewbc	Net Gain On Sales Of Investment Securities Loans And Other Assets NetGainOnSalesOfInvestmentSecuritiesLoansAndOtherAssets	22654000	USD
	us-gaap	Payments For Origination And Purchases Of Loans Held For Sale PaymentsForOriginationAndPurchasesOfLoansHeldForSale	58237000	USD
	ewbc	Prepayment Penalty On Modification Of Federal Home Loan Bank Advances PrepaymentPenaltyOnModificationOfFederalHomeLoanBankAdvances	37678000	USD
	ewbc	Net Proceeds From Fdic Shared Loss Agreements NetProceedsFromFdicSharedLossAgreements	83801000	USD
	ewbc	Net Change In Accrued Interest Receivable And Other Assets NetChangeInAccruedInterestReceivableAndOtherAssets	71753000	USD
	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	-15983000	USD
	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	-3293000	USD
	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	-88965000	USD
	us-gaap	Payments For Proceeds From Short Term Investments PaymentsForProceedsFromShortTermInvestments	285167000	USD
	us-gaap	Increase Decrease In Federal Funds Sold IncreaseDecreaseInFederalFundsSold	-20000000	USD
	us-gaap	Payments For Securities Purchased Under Agreements To Resell PaymentsForSecuritiesPurchasedUnderAgreementsToResell	750000000	USD
	us-gaap	Payments To Acquire Available For Sale Securities PaymentsToAcquireAvailableForSaleSecurities	1250317000	USD
	us-gaap	Payments To Acquire Loans Receivable PaymentsToAcquireLoansReceivable	371352000	USD
	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	5826000	USD
	ewbc	Investments In Affordable Housing Partnerships InvestmentsInAffordableHousingPartnerships	45500000	USD
	us-gaap	Proceeds From Sale Of Available For Sale Securities ProceedsFromSaleOfAvailableForSaleSecurities	1130024000	USD
	us-gaap	Proceeds From Sale Of Loans Receivable ProceedsFromSaleOfLoansReceivable	61979000	USD
	ewbc	Loans Held For Sale Originated For Investment LoansHeldForSaleOriginatedForInvestment	338022000	USD
	us-gaap	Proceeds From Sale Of Other Real Estate ProceedsFromSaleOfOtherRealEstate	76239000	USD
	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	12000	USD
	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	999518000	USD
	ewbc	Proceeds From Paydown Maturities And Termination Of Securities Purchased Under Resale Agreements ProceedsFromPaydownMaturitiesAndTerminationOfSecuritiesPurchasedUnderResaleAgreements	436434000	USD
	us-gaap	Payments For Proceeds From Federal Home Loan Bank Stock PaymentsForProceedsFromFederalHomeLoanBankStock	-18943000	USD
	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	360000	USD
	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	213425000	USD
	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	-25208000	USD
	us-gaap	Proceeds From Issuance Of Shares Under Incentive And Share Based Compensation Plans Including Stock Options ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions	3136000	USD
	us-gaap	Repayments Of Federal Home Loan Bank Borrowings RepaymentsOfFederalHomeLoanBankBorrowings	57615000	USD
	us-gaap	Repayments Of Other Long Term Debt RepaymentsOfOtherLongTermDebt	75000000	USD
	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	199950000	USD
	us-gaap	Payments Of Ordinary Dividends PaymentsOfOrdinaryDividends	48472000	USD
	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-2406000	USD
	us-gaap	Interest Paid InterestPaid	104829000	USD
	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	188739000	USD
	us-gaap	Adjustment To Additional Paid In Capital Income Tax Effect From Share Based Compensation Net AdjustmentToAdditionalPaidInCapitalIncomeTaxEffectFromShareBasedCompensationNet	546000	USD
	us-gaap	Mortgage Loan Related To Property Sales1 MortgageLoanRelatedToPropertySales1	3060000	USD
	us-gaap	Loans Assumed1 LoansAssumed1	1018000	USD
	us-gaap	Conversion Of Stock Amount Converted1 ConversionOfStockAmountConverted1	31000	USD
CY2011Q4	us-gaap	Fdic Indemnification Asset FDICIndemnificationAsset	511135000	USD
CY2012Q3	us-gaap	Assets Assets	21813165000	USD
	us-gaap	Transfer Of Portfolio Loans And Leases To Held For Sale1 TransferOfPortfolioLoansAndLeasesToHeldForSale1	631407000	USD
	us-gaap	Transfer Of Portfolio Loans And Leases To Held For Sale1 TransferOfPortfolioLoansAndLeasesToHeldForSale1	148755000	USD
CY2011	us-gaap	Other Than Temporary Impairment Losses Investments Portion In Other Comprehensive Income Loss Before Tax Including Portion Attributable To Noncontrolling Interest Availableforsale Securities OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxIncludingPortionAttributableToNoncontrollingInterestAvailableforsaleSecurities	5100000	USD
	ewbc	Term Of Commercial Loan Shared Loss Agreement TermOfCommercialLoanSharedLossAgreement	P5Y
	ewbc	Term Of Single Family Residential Mortgage Loan Shared Loss Agreement TermOfSingleFamilyResidentialMortgageLoanSharedLossAgreement	P10Y
	ewbc	Term Of Loss Recovery Provisions For Commercial Loans TermOfLossRecoveryProvisionsForCommercialLoans	P8Y
	ewbc	Term Of Loss Recovery Provisions For Single Family Residential Mortgage Loans TermOfLossRecoveryProvisionsForSingleFamilyResidentialMortgageLoans	P10Y
	ewbc	Number Of Days Following Anniversary NumberOfDaysFollowingAnniversary	P45D
CY2011Q4	us-gaap	Loans And Leases Receivable Net Reported Amount Covered And Not Covered LoansAndLeasesReceivableNetReportedAmountCoveredAndNotCovered	13984930000	USD
CY2011Q4	us-gaap	Loans And Leases Receivable Net Reported Amount LoansAndLeasesReceivableNetReportedAmount	10061788000	USD
CY2012Q3	us-gaap	Loans And Leases Receivable Net Reported Amount LoansAndLeasesReceivableNetReportedAmount	10916386000	USD
CY2012Q3	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	229514000	USD
CY2011Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	216523000	USD
CY2010Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	234633000	USD
CY2012Q2	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	226627000	USD
	us-gaap	Other Than Temporary Impairment Losses Investments Portion In Other Comprehensive Income Loss Tax Portion Attributable To Parent Availableforsale Securities OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossTaxPortionAttributableToParentAvailableforsaleSecurities	-2128000	USD
	us-gaap	Other Than Temporary Impairment Losses Investments Portion In Other Comprehensive Income Loss Tax Portion Attributable To Parent Availableforsale Securities OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossTaxPortionAttributableToParentAvailableforsaleSecurities	-2138000	USD
CY2012Q3	us-gaap	Short Term Investments ShortTermInvestments	347001000	USD
CY2012Q3	us-gaap	Securities Purchased Under Agreements To Resell SecuritiesPurchasedUnderAgreementsToResell	1100000000	USD
CY2012Q3	us-gaap	Loans And Leases Receivable Net Reported Amount Covered And Not Covered LoansAndLeasesReceivableNetReportedAmountCoveredAndNotCovered	14094971000	USD
CY2012Q3	ewbc	Other Real Estate Owned Net OtherRealEstateOwnedNet	40007000	USD
CY2012Q3	us-gaap	Other Real Estate And Foreclosed Assets OtherRealEstateAndForeclosedAssets	67620000	USD
CY2012Q3	ewbc	Investment In Affordable Housing Partnerships InvestmentInAffordableHousingPartnerships	178962000	USD
CY2012Q3	us-gaap	Interest Receivable InterestReceivable	88814000	USD
CY2012Q3	us-gaap	Due From Customer Acceptances DueFromCustomerAcceptances	30365000	USD
CY2012Q3	ewbc	Finite Lived Core Deposits Net FiniteLivedCoreDepositsNet	58746000	USD
CY2012Q3	us-gaap	Other Assets OtherAssets	794059000	USD
CY2012Q3	us-gaap	Noninterest Bearing Deposit Liabilities NoninterestBearingDepositLiabilities	4118502000	USD
CY2012Q3	us-gaap	Interest Bearing Deposit Liabilities InterestBearingDepositLiabilities	13547925000	USD
CY2012Q3	us-gaap	Deposits Deposits	17666427000	USD
CY2012Q3	us-gaap	Federal Home Loan Bank Advances Long Term FederalHomeLoanBankAdvancesLongTerm	363119000	USD
CY2012Q3	us-gaap	Securities Sold Under Agreements To Repurchase SecuritiesSoldUnderAgreementsToRepurchase	995000000	USD
CY2012Q3	us-gaap	Bank Acceptances Executed And Outstanding BankAcceptancesExecutedAndOutstanding	30365000	USD
CY2012Q3	us-gaap	Long Term Debt LongTermDebt	137178000	USD
CY2012Q3	ewbc	Accrued Interest Payable Accrued Expenses And Other Liabilities AccruedInterestPayableAccruedExpensesAndOtherLiabilities	302867000	USD
CY2012Q3	us-gaap	Preferred Stock Value PreferredStockValue	83027000	USD
CY2012Q3	us-gaap	Common Stock Value Outstanding CommonStockValueOutstanding	157000	USD
CY2012Q3	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	1462270000	USD
CY2012Q3	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	1095743000	USD
CY2012Q3	us-gaap	Treasury Stock Value TreasuryStockValue	321471000	USD
CY2012Q3	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	221908000	USD
CY2012Q3	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	203408000	USD
CY2011Q3	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	237782000	USD
CY2011Q3	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	215782000	USD
	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	673983000	USD
	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	621883000	USD
	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	673952000	USD
	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	598946000	USD
CY2011Q3	ewbc	Fdic Repayments FdicRepayments	3606000	USD
	ewbc	Fdic Repayments FdicRepayments	3606000	USD
	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	9330000	USD
	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	3663000	USD
	ewbc	Stock Issued During Period Value Director Retainer Fee StockIssuedDuringPeriodValueDirectorRetainerFee	520000	USD
	us-gaap	Adjustments Related To Tax Withholding For Share Based Compensation AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	619000	USD
	us-gaap	Dividends Preferred Stock DividendsPreferredStock	5143000	USD
	us-gaap	Dividends Common Stock DividendsCommonStock	16406000	USD
	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	14500000	USD
	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	11567000	USD
	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	3136000	USD
	ewbc	Stock Issued During Period Value Director Retainer Fee StockIssuedDuringPeriodValueDirectorRetainerFee	570000	USD
	us-gaap	Adjustments Related To Tax Withholding For Share Based Compensation AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	2867000	USD
	us-gaap	Dividends Preferred Stock DividendsPreferredStock	5142000	USD
	us-gaap	Dividends Common Stock DividendsCommonStock	43482000	USD
	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	199950000	USD
CY2012Q3	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	21813165000	USD
	ewbc	Stock Issued During Period Shares Director Retainer Fee StockIssuedDuringPeriodSharesDirectorRetainerFee	27831	shares
CY2012Q3	ewbc	Other Asset Investments Change In Net Unrealized Holding Gain Loss Net Of Tax OtherAssetInvestmentsChangeInNetUnrealizedHoldingGainLossNetOfTax	5000	USD
CY2011Q3	ewbc	Other Asset Investments Change In Net Unrealized Holding Gain Loss Net Of Tax OtherAssetInvestmentsChangeInNetUnrealizedHoldingGainLossNetOfTax	-217000	USD
	ewbc	Other Asset Investments Change In Net Unrealized Holding Gain Loss Net Of Tax OtherAssetInvestmentsChangeInNetUnrealizedHoldingGainLossNetOfTax	9000	USD
	ewbc	Other Asset Investments Change In Net Unrealized Holding Gain Loss Net Of Tax OtherAssetInvestmentsChangeInNetUnrealizedHoldingGainLossNetOfTax	-89000	USD
	ewbc	Amount Of Loans Removed From Covered Loans AmountOfLoansRemovedFromCoveredLoans	709600000	USD
	ewbc	Loan Discount Related To Loans Removed LoanDiscountRelatedToLoansRemoved	74300000	USD
CY2012Q3	ewbc	Charge For Funds Used ChargeForFundsUsed	37954000	USD
CY2011Q3	ewbc	Charge For Funds Used ChargeForFundsUsed	53712000	USD
	ewbc	Charge For Funds Used ChargeForFundsUsed	122606000	USD
	ewbc	Charge For Funds Used ChargeForFundsUsed	180442000	USD
CY2012Q3	ewbc	Interest Spread On Funds Used InterestSpreadOnFundsUsed	216208000	USD
CY2012Q3	ewbc	Credit On Funds Provided CreditOnFundsProvided	37954000	USD
CY2012Q3	ewbc	Interest Spread On Funds Provided InterestSpreadOnFundsProvided	5700000	USD
CY2011Q3	ewbc	Interest Spread On Funds Used InterestSpreadOnFundsUsed	229029000	USD
CY2011Q3	ewbc	Credit On Funds Provided CreditOnFundsProvided	53712000	USD
CY2011Q3	ewbc	Interest Spread On Funds Provided InterestSpreadOnFundsProvided	8753000	USD
	ewbc	Interest Spread On Funds Used InterestSpreadOnFundsUsed	651968000	USD
	ewbc	Credit On Funds Provided CreditOnFundsProvided	122606000	USD
	ewbc	Interest Spread On Funds Provided InterestSpreadOnFundsProvided	22015000	USD
	ewbc	Interest Spread On Funds Used InterestSpreadOnFundsUsed	631102000	USD
	ewbc	Credit On Funds Provided CreditOnFundsProvided	180442000	USD
	ewbc	Interest Spread On Funds Provided InterestSpreadOnFundsProvided	42850000	USD
CY2012Q3	ewbc	Covered Loans Collectively Evaluated For Impairment CoveredLoansCollectivelyEvaluatedForImpairment	5136000	USD
CY2012Q3	ewbc	Covered Loans Acquired With Deteriorated Credit Quality CoveredLoansAcquiredWithDeterioratedCreditQuality	3300070000	USD
CY2012Q3	ewbc	Cost Of Repurchase Of Treasury Shares CostOfRepurchaseOfTreasuryShares	199900000	USD
CY2012Q3	ewbc	Other Asset Investments Change In Net Unrealized Holding Gain Loss Before Tax OtherAssetInvestmentsChangeInNetUnrealizedHoldingGainLossBeforeTax	9000	USD
	ewbc	Other Asset Investments Change In Net Unrealized Holding Gain Loss Before Tax OtherAssetInvestmentsChangeInNetUnrealizedHoldingGainLossBeforeTax	16000	USD
CY2012Q3	ewbc	Other Asset Investments Change In Net Unrealized Holding Gain Loss Adjustment Tax OtherAssetInvestmentsChangeInNetUnrealizedHoldingGainLossAdjustmentTax	-4000	USD
	ewbc	Other Asset Investments Change In Net Unrealized Holding Gain Loss Adjustment Tax OtherAssetInvestmentsChangeInNetUnrealizedHoldingGainLossAdjustmentTax	-7000	USD
CY2011Q3	ewbc	Other Asset Investments Change In Net Unrealized Holding Gain Loss Before Tax OtherAssetInvestmentsChangeInNetUnrealizedHoldingGainLossBeforeTax	-374000	USD
	ewbc	Other Asset Investments Change In Net Unrealized Holding Gain Loss Before Tax OtherAssetInvestmentsChangeInNetUnrealizedHoldingGainLossBeforeTax	-153000	USD
CY2011Q3	ewbc	Other Asset Investments Change In Net Unrealized Holding Gain Loss Adjustment Tax OtherAssetInvestmentsChangeInNetUnrealizedHoldingGainLossAdjustmentTax	157000	USD
	ewbc	Other Asset Investments Change In Net Unrealized Holding Gain Loss Adjustment Tax OtherAssetInvestmentsChangeInNetUnrealizedHoldingGainLossAdjustmentTax	64000	USD
	us-gaap	Other Than Temporary Impairment Losses Investments Portion In Other Comprehensive Income Loss Before Tax Including Portion Attributable To Noncontrolling Interest Availableforsale Securities OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxIncludingPortionAttributableToNoncontrollingInterestAvailableforsaleSecurities	5100000	USD
CY2011Q3	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	-16670000	USD
CY2012Q3	ewbc	Companys Liability For Losses Under Shared Loss Agreements CompanysLiabilityForLossesUnderSharedLossAgreements	319000	USD
CY2011Q3	ewbc	Companys Liability For Losses Under Shared Loss Agreements CompanysLiabilityForLossesUnderSharedLossAgreements	650000	USD
CY2012Q3	ewbc	Total Eligible Losses Subject To Shared Loss Agreements TotalEligibleLossesSubjectToSharedLossAgreements	1600000	USD
CY2011Q3	ewbc	Total Eligible Losses Subject To Shared Loss Agreements TotalEligibleLossesSubjectToSharedLossAgreements	3300000	USD
	us-gaap	Other Than Temporary Impairment Losses Investments Availableforsale Securities OtherThanTemporaryImpairmentLossesInvestmentsAvailableforsaleSecurities	5165000	USD
	us-gaap	Other Than Temporary Impairment Losses Investments Availableforsale Securities OtherThanTemporaryImpairmentLossesInvestmentsAvailableforsaleSecurities	5555000	USD
CY2012Q3	ewbc	Provision For Loan Lease And Other Losses Covered ProvisionForLoanLeaseAndOtherLossesCovered	-5179000	USD
CY2011Q3	ewbc	Provision For Loan Lease And Other Losses Covered ProvisionForLoanLeaseAndOtherLossesCovered	297000	USD
	ewbc	Provision For Loan Lease And Other Losses Covered ProvisionForLoanLeaseAndOtherLossesCovered	-5705000	USD
	ewbc	Provision For Loan Lease And Other Losses Covered ProvisionForLoanLeaseAndOtherLossesCovered	-2209000	USD
CY2012Q3	ewbc	Provision For Loan Lease And Other Losses Noncovered ProvisionForLoanLeaseAndOtherLossesNoncovered	13321000	USD
CY2011Q3	ewbc	Provision For Loan Lease And Other Losses Noncovered ProvisionForLoanLeaseAndOtherLossesNoncovered	22297000	USD
	ewbc	Provision For Loan Lease And Other Losses Noncovered ProvisionForLoanLeaseAndOtherLossesNoncovered	46395000	USD
	ewbc	Provision For Loan Lease And Other Losses Noncovered ProvisionForLoanLeaseAndOtherLossesNoncovered	72797000	USD
CY2011	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	95006000	USD
CY2012Q3	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	18500000	USD
	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	52100000	USD
CY2011Q3	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	22000000	USD
	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	75006000	USD
	us-gaap	Adjustments To Reconcile Net Income Loss To Cash Provided By Used In Operating Activities AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities	-53187000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities Continuing Operations NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	156563000	USD
	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	99000	USD
	ewbc	Financing Receivable Modifications Subsequent Default Recorded Investment Charge Off Or Transferred FinancingReceivableModificationsSubsequentDefaultRecordedInvestmentChargeOffOrTransferred	3500000	USD

Files In Submission

Name	View Source	Status
0001104659-12-075416-index-headers.html	Edgar Link	pending
0001104659-12-075416-index.html	Edgar Link	pending
0001104659-12-075416.txt	Edgar Link	pending
0001104659-12-075416-xbrl.zip	Edgar Link	pending
a12-18992_110q.htm	Edgar Link	pending
a12-18992_1ex31d1.htm	Edgar Link	pending
a12-18992_1ex31d2.htm	Edgar Link	pending
a12-18992_1ex32d1.htm	Edgar Link	pending
a12-18992_1ex32d2.htm	Edgar Link	pending
ewbc-20120930.xml	Edgar Link	completed
ewbc-20120930.xsd	Edgar Link	pending
ewbc-20120930_cal.xml	Edgar Link	unprocessable
ewbc-20120930_def.xml	Edgar Link	unprocessable
ewbc-20120930_lab.xml	Edgar Link	unprocessable
ewbc-20120930_pre.xml	Edgar Link	unprocessable
FilingSummary.xml	Edgar Link	unprocessable
Financial_Report.xls	Edgar Link	pending
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$EWBC
EAST WEST BANCORP INC Stock $ewbc

2012 Q4 Form 10-Q Financial Statement

#000110465912075416 Filed on November 07, 2012

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$EWBC EAST WEST BANCORP INC Stock $ewbc

2012 Q4 Form 10-Q Financial Statement

#000110465912075416 Filed on November 07, 2012

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$EWBC
EAST WEST BANCORP INC Stock $ewbc