$EWBC
EAST WEST BANCORP INC Stock $ewbc

$ewbc Overview Financials Valuation SEC Filings Company Website

2011 Q4 Form 10-K Financial Statement

#000110465913016095 Filed on February 28, 2013

Income Statement

Concept	2011 Q4	2011 Q3	2011 Q2
Revenue	$268.9M	$282.7M	$274.5M
YoY Change
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	$18.70M	-$16.67M	$15.30M
YoY Change	98.94%	-214.18%	-12.57%
% of Gross Profit
Operating Expenses
YoY Change
Operating Profit
YoY Change
Interest Expense	$39.83M	$44.96M	$47.13M
YoY Change
% of Operating Profit
Other Income/Expense, Net
YoY Change
Pretax Income	$103.3M	$97.69M	$95.73M
YoY Change	20.58%	32.9%	63.08%
Income Tax	$37.13M	$35.25M	$35.21M
% Of Pretax Income	35.93%	36.09%	36.78%
Net Earnings	$66.21M	$62.43M	$60.53M
YoY Change	17.6%	32.83%	66.74%
Net Earnings / Revenue	24.62%	22.08%	22.05%
Basic Earnings Per Share	$0.44	$0.41	$0.40
Diluted Earnings Per Share	$0.43	$0.41	$0.39
COMMON SHARES
Basic Shares Outstanding		147.2M shares	147.0M shares
Diluted Shares Outstanding		153.5M shares

Balance Sheet

Concept	2011 Q4	2011 Q3	2011 Q2
SHORT-TERM ASSETS
Cash & Short-Term Investments
YoY Change
Cash & Equivalents	$1.431B	$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	$118.9M	$119.0M	$117.0M
YoY Change	-12.5%
Goodwill	$337.4M	$337.4M
YoY Change	0.0%
Intangibles
YoY Change
Long-Term Investments	$94.87M	$172.0M	$178.0M
YoY Change	-38.79%
Other Assets
YoY Change
Total Long-Term Assets
YoY Change
TOTAL ASSETS
Total Short-Term Assets
Total Long-Term Assets
Total Assets	$21.97B	$21.81B	$21.87B
YoY Change	6.13%	6.84%	9.55%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable
YoY Change
Accrued Expenses	$318.0M	$232.0M	$371.0M
YoY Change	14.39%	-43.0%	1.64%
Deferred Revenue
YoY Change
Short-Term Debt	$1.020B	$1.025B	$1.053B
YoY Change	-5.9%	-4.56%	0.19%
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$318.0M	$232.0M	$371.0M
YoY Change	14.39%	-43.0%	1.64%
LONG-TERM LIABILITIES
Long-Term Debt	$212.0M	$304.0M	$336.0M
YoY Change	-28.38%	28.81%	23.99%
Other Long-Term Liabilities
YoY Change
Total Long-Term Liabilities	$212.0M	$304.0M	$336.0M
YoY Change	-28.38%	28.81%	23.99%
TOTAL LIABILITIES
Total Short-Term Liabilities	$318.0M	$232.0M	$371.0M
Total Long-Term Liabilities	$212.0M	$304.0M	$336.0M
Total Liabilities	$19.66B	$19.55B	$19.64B
YoY Change	5.76%	8.43%	11.43%
SHAREHOLDERS EQUITY
Retained Earnings	$934.6M
YoY Change	29.79%
Common Stock
YoY Change
Preferred Stock
YoY Change
Treasury Stock (at cost)	$116.0M
YoY Change	4.26%
Treasury Stock Shares	7.470M shares
Shareholders Equity	$2.312B	$2.261B	$2.229B
YoY Change
Total Liabilities & Shareholders Equity	$21.97B	$21.81B	$21.87B
YoY Change	6.13%	6.84%	9.55%

Cashflow Statement

Concept	2011 Q4	2011 Q3	2011 Q2
OPERATING ACTIVITIES
Net Income	$66.21M	$62.43M	$60.53M
YoY Change	17.6%	32.83%	66.74%
Depreciation, Depletion And Amortization	$18.70M	-$16.67M	$15.30M
YoY Change	98.94%	-214.18%	-12.57%
Cash From Operating Activities	$55.80M	-$140.5M	$181.7M
YoY Change	-69.42%	-179.83%	-27.17%
INVESTING ACTIVITIES
Capital Expenditures	-$3.000M	-$5.300M	-$1.200M
YoY Change	275.0%	-31.17%	-52.0%
Acquisitions
YoY Change
Other Investing Activities	$146.9M	-$369.6M	-$484.9M
YoY Change	-178.85%	-55.6%	-172.58%
Cash From Investing Activities	$143.9M	-$374.9M	-$486.1M
YoY Change	-176.87%	-55.37%	-173.04%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	125.6M	22.70M	410.0M
YoY Change	-49.17%	-93.67%	-145.54%
NET CHANGE
Cash From Operating Activities	55.80M	-140.5M	181.7M
Cash From Investing Activities	143.9M	-374.9M	-486.1M
Cash From Financing Activities	125.6M	22.70M	410.0M
Net Change In Cash	325.3M	-492.7M	105.6M
YoY Change	34.2%	61.28%	623.29%
FREE CASH FLOW
Cash From Operating Activities	$55.80M	-$140.5M	$181.7M
Capital Expenditures	-$3.000M	-$5.300M	-$1.200M
Free Cash Flow	$58.80M	-$135.2M	$182.9M
YoY Change	-67.92%	-173.6%	-27.42%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2012Q4	us-gaap	Loans And Leases Receivable Net Reported Amount Covered And Not Covered LoansAndLeasesReceivableNetReportedAmountCoveredAndNotCovered	14645785000	USD
CY2012	dei	Entity Registrant Name EntityRegistrantName	EAST WEST BANCORP INC
CY2012	dei	Entity Central Index Key EntityCentralIndexKey	0001069157
CY2012	dei	Document Type DocumentType	10-K
CY2012	dei	Document Period End Date DocumentPeriodEndDate	2012-12-31
CY2012	dei	Amendment Flag AmendmentFlag	false
CY2012	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2012	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2012	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2012	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2012	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2012Q2	dei	Entity Public Float EntityPublicFloat	3309819520	USD
CY2013Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	140126005	shares
CY2012	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2012
CY2012	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2012Q4	us-gaap	Other Real Estate And Foreclosed Assets OtherRealEstateAndForeclosedAssets	59719000	USD
CY2012Q4	us-gaap	Deposits Deposits	18309354000	USD
CY2012Q4	us-gaap	Liabilities Liabilities	20153988000	USD
CY2012Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2011Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2012Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	22536110000	USD
CY2011Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	1431185000	USD
CY2011Q4	us-gaap	Short Term Investments ShortTermInvestments	61834000	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 LoansAndLeasesReceivableNetReportedAmount	10061788000	USD
CY2011Q4	us-gaap	Loans And Leases Receivable Net Reported Amount Covered LoansAndLeasesReceivableNetReportedAmountCovered	3923142000	USD
CY2011Q4	us-gaap	Loans And Leases Receivable Net Reported Amount Covered And Not Covered LoansAndLeasesReceivableNetReportedAmountCoveredAndNotCovered	13984930000	USD
CY2011Q4	us-gaap	Fdic Indemnification Asset FDICIndemnificationAsset	511135000	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	us-gaap	Federal Home Loan Bank Stock FederalHomeLoanBankStock	136897000	USD
CY2011Q4	us-gaap	Federal Reserve Bank Stock FederalReserveBankStock	47512000	USD
CY2011Q4	ewbc	Investment In Affordable Housing Partnerships InvestmentInAffordableHousingPartnerships	144445000	USD
CY2011Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	118926000	USD
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
CY2011Q4	us-gaap	Cash Surrender Value Of Life Insurance CashSurrenderValueOfLifeInsurance	107486000	USD
CY2011Q4	us-gaap	Other Assets OtherAssets	500640000	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
CY2011Q4	ewbc	Accrued Interest Payable Accrued Expenses And Other Liabilities AccruedInterestPayableAccruedExpensesAndOtherLiabilities	317511000	USD
CY2011Q4	us-gaap	Liabilities Liabilities	19656924000	USD
CY2011Q4	us-gaap	Preferred Stock Value PreferredStockValue	83027000	USD
CY2011Q4	us-gaap	Common Stock Value Outstanding CommonStockValueOutstanding	157000	USD
CY2011Q4	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	1443883000	USD
CY2011Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	934617000	USD
CY2011Q4	us-gaap	Treasury Stock Value TreasuryStockValue	116001000	USD
CY2011Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-33940000	USD
CY2011Q4	us-gaap	Stockholders Equity StockholdersEquity	2311743000	USD
CY2011Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	21968667000	USD
CY2012Q4	us-gaap	Available For Sale Securities Amortized Cost AvailableForSaleSecuritiesAmortizedCost	2599018000	USD
CY2011Q4	us-gaap	Available For Sale Securities Amortized Cost AvailableForSaleSecuritiesAmortizedCost	3132968000	USD
CY2012Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	229382000	USD
CY2011Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	209876000	USD
CY2012Q4	us-gaap	Loans And Leases Receivable Allowance Covered LoansAndLeasesReceivableAllowanceCovered	5153000	USD
CY2011Q4	us-gaap	Loans And Leases Receivable Allowance Covered LoansAndLeasesReceivableAllowanceCovered	6647000	USD
CY2011Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.001
CY2011Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	200000000	shares
CY2011Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	156798011	shares
CY2011Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	149327907	shares
CY2011Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	7470104	shares
CY2012Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	16866101	shares
CY2012Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.001
CY2012Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	200000000	shares
CY2012Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	157160193	shares
CY2012Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	140294092	shares
CY2012	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	1051095000	USD
CY2011	us-gaap	Interest And Fee Income Loans And Leases InterestAndFeeIncomeLoansAndLeases	945798000	USD
CY2010	us-gaap	Interest And Fee Income Loans And Leases InterestAndFeeIncomeLoansAndLeases	998589000	USD
CY2011	us-gaap	Interest And Dividend Income Securities InterestAndDividendIncomeSecurities	89469000	USD
CY2010	us-gaap	Interest And Dividend Income Securities InterestAndDividendIncomeSecurities	70052000	USD
CY2011	us-gaap	Interest Income Securities Purchased Under Agreements To Resell InterestIncomeSecuritiesPurchasedUnderAgreementsToResell	19216000	USD
CY2010	us-gaap	Interest Income Securities Purchased Under Agreements To Resell InterestIncomeSecuritiesPurchasedUnderAgreementsToResell	14208000	USD
CY2011	ewbc	Investment In Federal Home Loan Bank Stock InvestmentInFederalHomeLoanBankStock	550000	USD
CY2010	ewbc	Investment In Federal Home Loan Bank Stock InvestmentInFederalHomeLoanBankStock	597000	USD
CY2011	ewbc	Investment In Federal Reserve Bank Stock InvestmentInFederalReserveBankStock	2840000	USD
CY2010	ewbc	Investment In Federal Reserve Bank Stock InvestmentInFederalReserveBankStock	2751000	USD
CY2011	ewbc	Short Term Investments As Presented In Statements Of Income ShortTermInvestmentsAsPresentedInStatementsOfIncome	22575000	USD
CY2010	ewbc	Short Term Investments As Presented In Statements Of Income ShortTermInvestmentsAsPresentedInStatementsOfIncome	9634000	USD
CY2011	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	1080448000	USD
CY2010	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	1095831000	USD
CY2011	us-gaap	Interest Expense Deposits InterestExpenseDeposits	107110000	USD
CY2010	us-gaap	Interest Expense Deposits InterestExpenseDeposits	116737000	USD
CY2011	us-gaap	Interest Expense Federal Home Loan Bank And Federal Reserve Bank Advances Long Term InterestExpenseFederalHomeLoanBankAndFederalReserveBankAdvancesLongTerm	15461000	USD
CY2010	us-gaap	Interest Expense Federal Home Loan Bank And Federal Reserve Bank Advances Long Term InterestExpenseFederalHomeLoanBankAndFederalReserveBankAdvancesLongTerm	26641000	USD
CY2011	us-gaap	Interest Expense Securities Sold Under Agreements To Repurchase InterestExpenseSecuritiesSoldUnderAgreementsToRepurchase	48561000	USD
CY2010	us-gaap	Interest Expense Securities Sold Under Agreements To Repurchase InterestExpenseSecuritiesSoldUnderAgreementsToRepurchase	48993000	USD
CY2011	us-gaap	Interest Expense Other Long Term Debt InterestExpenseOtherLongTermDebt	5832000	USD
CY2010	us-gaap	Interest Expense Other Long Term Debt InterestExpenseOtherLongTermDebt	6420000	USD
CY2011	ewbc	Other Borrowings Interest Expense OtherBorrowingsInterestExpense	458000	USD
CY2010	ewbc	Other Borrowings Interest Expense OtherBorrowingsInterestExpense	2326000	USD
CY2011	us-gaap	Interest Expense InterestExpense	177422000	USD
CY2010	us-gaap	Interest Expense InterestExpense	201117000	USD
CY2011	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	903026000	USD
CY2010	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	894714000	USD
CY2011	ewbc	Provision For Loan Lease And Other Losses Noncovered ProvisionForLoanLeaseAndOtherLossesNoncovered	92584000	USD
CY2010	ewbc	Provision For Loan Lease And Other Losses Noncovered ProvisionForLoanLeaseAndOtherLossesNoncovered	195934000	USD
CY2011	ewbc	Provision For Loan Lease And Other Losses Covered ProvisionForLoanLeaseAndOtherLossesCovered	-2422000	USD
CY2010	ewbc	Provision For Loan Lease And Other Losses Covered ProvisionForLoanLeaseAndOtherLossesCovered	-4225000	USD
CY2011	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	808020000	USD
CY2010	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	694555000	USD
CY2012	us-gaap	Interest Expense InterestExpense	132168000	USD
CY2012	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	918927000	USD
CY2012	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	853743000	USD
CY2010	us-gaap	Gain On Purchase Of Business GainOnPurchaseOfBusiness	22874000	USD
CY2011	us-gaap	Other Than Temporary Impairment Losses Investments Availableforsale Securities OtherThanTemporaryImpairmentLossesInvestmentsAvailableforsaleSecurities	5736000	USD
CY2010	us-gaap	Other Than Temporary Impairment Losses Investments Availableforsale Securities OtherThanTemporaryImpairmentLossesInvestmentsAvailableforsaleSecurities	32127000	USD
CY2011	us-gaap	Other Than Temporary Impairment Losses Investments Portion In Other Comprehensive Income Loss Before Tax Portion Attributable To Parent Availableforsale Securities OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParentAvailableforsaleSecurities	5103000	USD
CY2010	us-gaap	Other Than Temporary Impairment Losses Investments Portion In Other Comprehensive Income Loss Before Tax Portion Attributable To Parent Availableforsale Securities OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParentAvailableforsaleSecurities	15458000	USD
CY2011	us-gaap	Other Than Temporary Impairment Losses Investments Portion Recognized In Earnings Net Availableforsale Securities OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetAvailableforsaleSecurities	633000	USD
CY2010	us-gaap	Other Than Temporary Impairment Losses Investments Portion Recognized In Earnings Net Availableforsale Securities OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetAvailableforsaleSecurities	16669000	USD
CY2011	ewbc	Decrease In Fdic Indemnification Asset Receivable DecreaseInFdicIndemnificationAssetReceivable	-100141000	USD
CY2010	ewbc	Decrease In Fdic Indemnification Asset Receivable DecreaseInFdicIndemnificationAssetReceivable	-83213000	USD
CY2011	ewbc	Branch Fees BranchFees	33776000	USD
CY2010	ewbc	Branch Fees BranchFees	32634000	USD
CY2011	us-gaap	Gain Loss On Sale Of Securities Net GainLossOnSaleOfSecuritiesNet	9703000	USD
CY2010	us-gaap	Gain Loss On Sale Of Securities Net GainLossOnSaleOfSecuritiesNet	31237000	USD
CY2011	us-gaap	Fees And Commissions Other FeesAndCommissionsOther	13997000	USD
CY2010	us-gaap	Fees And Commissions Other FeesAndCommissionsOther	11816000	USD
CY2011	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	9143000	USD
CY2010	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	3171000	USD
CY2011	us-gaap	Servicing Fees Net ServicingFeesNet	8350000	USD
CY2010	us-gaap	Servicing Fees Net ServicingFeesNet	8526000	USD
CY2011	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	4031000	USD
CY2010	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	4083000	USD
CY2011	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	20185000	USD
CY2010	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	18515000	USD
CY2011	us-gaap	Gain Loss On Disposition Of Assets GainLossOnDispositionOfAssets	2274000	USD
CY2010	us-gaap	Gain Loss On Disposition Of Assets GainLossOnDispositionOfAssets	-189000	USD
CY2011	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	10239000	USD
CY2010	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	6485000	USD
CY2011	us-gaap	Noninterest Income NoninterestIncome	10924000	USD
CY2010	us-gaap	Noninterest Income NoninterestIncome	39270000	USD
CY2012	us-gaap	Noninterest Income NoninterestIncome	-5618000	USD
CY2012	us-gaap	Other Than Temporary Impairment Losses Investments Portion Recognized In Earnings Net Availableforsale Securities OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetAvailableforsaleSecurities	99000	USD
CY2011	us-gaap	Labor And Related Expense LaborAndRelatedExpense	160093000	USD
CY2010	us-gaap	Labor And Related Expense LaborAndRelatedExpense	170052000	USD
CY2011	us-gaap	Occupancy Net OccupancyNet	50082000	USD
CY2010	us-gaap	Occupancy Net OccupancyNet	52073000	USD
CY2011	ewbc	Amortization Of Investments In Affordable Housing Partnerships AmortizationOfInvestmentsInAffordableHousingPartnerships	17324000	USD
CY2010	ewbc	Amortization Of Investments In Affordable Housing Partnerships AmortizationOfInvestmentsInAffordableHousingPartnerships	10032000	USD
CY2011	ewbc	Amortization And Impairment Write Downs Of Premiums On Deposits Acquired AmortizationAndImpairmentWriteDownsOfPremiumsOnDepositsAcquired	12327000	USD
CY2010	ewbc	Amortization And Impairment Write Downs Of Premiums On Deposits Acquired AmortizationAndImpairmentWriteDownsOfPremiumsOnDepositsAcquired	13283000	USD
CY2011	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	20531000	USD
CY2010	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	25201000	USD
CY2011	us-gaap	Loan Processing Fee LoanProcessingFee	19379000	USD
CY2010	us-gaap	Loan Processing Fee LoanProcessingFee	21070000	USD
CY2011	us-gaap	Foreclosed Real Estate Expense ForeclosedRealEstateExpense	40435000	USD
CY2010	us-gaap	Foreclosed Real Estate Expense ForeclosedRealEstateExpense	61568000	USD
CY2011	us-gaap	Legal Fees LegalFees	21327000	USD
CY2010	us-gaap	Legal Fees LegalFees	19577000	USD
CY2011	ewbc	Prepayment Penalty For Fhlb Advances And Other Borrowings PrepaymentPenaltyForFhlbAdvancesAndOtherBorrowings	12281000	USD
CY2010	ewbc	Prepayment Penalty For Fhlb Advances And Other Borrowings PrepaymentPenaltyForFhlbAdvancesAndOtherBorrowings	13832000	USD
CY2011	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	8598000	USD
CY2010	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	10615000	USD
CY2011	ewbc	Deposit Related Expenses DepositRelatedExpenses	5699000	USD
CY2010	ewbc	Deposit Related Expenses DepositRelatedExpenses	4750000	USD
CY2011	us-gaap	Professional Fees ProfessionalFees	7151000	USD
CY2010	us-gaap	Professional Fees ProfessionalFees	7984000	USD
CY2011	us-gaap	Other Noninterest Expense OtherNoninterestExpense	60383000	USD
CY2010	us-gaap	Other Noninterest Expense OtherNoninterestExpense	67879000	USD
CY2011	us-gaap	Noninterest Expense NoninterestExpense	435610000	USD
CY2010	us-gaap	Noninterest Expense NoninterestExpense	477916000	USD
CY2011	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	383334000	USD
CY2010	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	255909000	USD
CY2011	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	138100000	USD
CY2010	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	91345000	USD
CY2011	us-gaap	Net Income Loss NetIncomeLoss	245234000	USD
CY2010	us-gaap	Net Income Loss NetIncomeLoss	164564000	USD
CY2011	us-gaap	Preferred Stock Dividends And Other Adjustments PreferredStockDividendsAndOtherAdjustments	6857000	USD
CY2010	us-gaap	Preferred Stock Dividends And Other Adjustments PreferredStockDividendsAndOtherAdjustments	43126000	USD
CY2011	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	238377000	USD
CY2012	us-gaap	Noninterest Expense NoninterestExpense	422533000	USD
CY2010	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	121438000	USD
CY2012	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	274793000	USD
CY2012	us-gaap	Net Income Loss NetIncomeLoss	281650000	USD
CY2011	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	147093000	shares
CY2010	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	137478000	shares
CY2011	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	153467000	shares
CY2010	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	147102000	shares
CY2011	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.16
CY2010	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.04
CY2011	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.62
CY2011	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.60
CY2010	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.88
CY2010	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.83
CY2012	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	38609000	USD
CY2012	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	320259000	USD
CY2011	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-12333000	USD
CY2010	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	12554000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment For Sale Of Securities Included In Net Income Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentForSaleOfSecuritiesIncludedInNetIncomeNetOfTax	-439000	USD
CY2011	us-gaap	Other Than Temporary Impairment Losses Investments Portion In Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent Availableforsale Securities OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParentAvailableforsaleSecurities	2960000	USD
CY2010	us-gaap	Other Than Temporary Impairment Losses Investments Portion In Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent Availableforsale Securities OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParentAvailableforsaleSecurities	8966000	USD
CY2012	ewbc	Other Asset Investments Change In Net Unrealized Holding Gain Loss Net Of Tax OtherAssetInvestmentsChangeInNetUnrealizedHoldingGainLossNetOfTax	31000	USD
CY2011	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent	-764000	USD
CY2010	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent	1693000	USD
CY2011	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-21526000	USD
CY2010	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-13013000	USD
CY2011	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	223708000	USD
CY2010	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	151551000	USD
CY2012	us-gaap	Adjustments To Reconcile Net Income Loss To Cash Provided By Used In Operating Activities AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities	5876000	USD
CY2012	us-gaap	Net Cash Provided By Used In Operating Activities Continuing Operations NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	287526000	USD
CY2012	us-gaap	Net Cash Provided By Used In Investing Activities Continuing Operations NetCashProvidedByUsedInInvestingActivitiesContinuingOperations	-758905000	USD
CY2012	us-gaap	Net Cash Provided By Used In Financing Activities Continuing Operations NetCashProvidedByUsedInFinancingActivitiesContinuingOperations	364200000	USD
CY2012	us-gaap	Net Cash Provided By Used In Continuing Operations NetCashProvidedByUsedInContinuingOperations	-108079000	USD
CY2011	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	67460000	USD
CY2010	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	57593000	USD
CY2011	ewbc	Accretion Amortization Of Discount And Premiums Loans And Other Assets AccretionAmortizationOfDiscountAndPremiumsLoansAndOtherAssets	210868000	USD
CY2010	ewbc	Accretion Amortization Of Discount And Premiums Loans And Other Assets AccretionAmortizationOfDiscountAndPremiumsLoansAndOtherAssets	235988000	USD
CY2011	ewbc	Decrease In Fdic Indemnification Asset And Receivable DecreaseInFdicIndemnificationAssetAndReceivable	-100141000	USD
CY2010	ewbc	Decrease In Fdic Indemnification Asset And Receivable DecreaseInFdicIndemnificationAssetAndReceivable	-83213000	USD
CY2011	us-gaap	Share Based Compensation ShareBasedCompensation	13543000	USD
CY2010	us-gaap	Share Based Compensation ShareBasedCompensation	8761000	USD
CY2011	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	189497000	USD
CY2010	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	12377000	USD
CY2011	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	95006000	USD
CY2010	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	200159000	USD
CY2011	us-gaap	Impairment Of Real Estate ImpairmentOfRealEstate	29266000	USD
CY2010	us-gaap	Impairment Of Real Estate ImpairmentOfRealEstate	49669000	USD
CY2011	ewbc	Net Gain On Sales Of Investment Securities Loans And Other Assets NetGainOnSalesOfInvestmentSecuritiesLoansAndOtherAssets	30998000	USD
CY2010	ewbc	Net Gain On Sales Of Investment Securities Loans And Other Assets NetGainOnSalesOfInvestmentSecuritiesLoansAndOtherAssets	51776000	USD
CY2011	us-gaap	Payments For Origination And Purchases Of Loans Held For Sale PaymentsForOriginationAndPurchasesOfLoansHeldForSale	72761000	USD
CY2010	us-gaap	Payments For Origination And Purchases Of Loans Held For Sale PaymentsForOriginationAndPurchasesOfLoansHeldForSale	42985000	USD
CY2011	ewbc	Proceeds From Sales Of Loans Originated As Loans Held For Sale ProceedsFromSalesOfLoansOriginatedAsLoansHeldForSale	41388000	USD
CY2010	ewbc	Proceeds From Sales Of Loans Originated As Loans Held For Sale ProceedsFromSalesOfLoansOriginatedAsLoansHeldForSale	42059000	USD
CY2011	ewbc	Net Proceeds From Fdic Shared Loss Agreements NetProceedsFromFdicSharedLossAgreements	159983000	USD
CY2010	ewbc	Net Proceeds From Fdic Shared Loss Agreements NetProceedsFromFdicSharedLossAgreements	331500000	USD
CY2011	ewbc	Net Change In Accrued Interest Receivable And Other Assets NetChangeInAccruedInterestReceivableAndOtherAssets	146911000	USD
CY2010	ewbc	Net Change In Accrued Interest Receivable And Other Assets NetChangeInAccruedInterestReceivableAndOtherAssets	-87009000	USD
CY2011	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	-233868000	USD
CY2010	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	157275000	USD
CY2011	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	-3709000	USD
CY2010	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	-1861000	USD
CY2011	us-gaap	Adjustments To Reconcile Net Income Loss To Cash Provided By Used In Operating Activities AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities	10083000	USD
CY2010	us-gaap	Adjustments To Reconcile Net Income Loss To Cash Provided By Used In Operating Activities AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities	704632000	USD
CY2011	us-gaap	Net Cash Provided By Used In Operating Activities Continuing Operations NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	255317000	USD
CY2010	us-gaap	Net Cash Provided By Used In Operating Activities Continuing Operations NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	869196000	USD
CY2010	us-gaap	Cash Acquired From Acquisition CashAcquiredFromAcquisition	67186000	USD
CY2011	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	934773000	USD
CY2010	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	-498187000	USD
CY2011	us-gaap	Payments For Proceeds From Short Term Investments PaymentsForProceedsFromShortTermInvestments	-81726000	USD
CY2010	us-gaap	Payments For Proceeds From Short Term Investments PaymentsForProceedsFromShortTermInvestments	-103285000	USD
CY2011	us-gaap	Payments For Securities Purchased Under Agreements To Resell PaymentsForSecuritiesPurchasedUnderAgreementsToResell	1292066000	USD
CY2010	us-gaap	Payments For Securities Purchased Under Agreements To Resell PaymentsForSecuritiesPurchasedUnderAgreementsToResell	950000000	USD
CY2011	us-gaap	Payments To Acquire Available For Sale Securities PaymentsToAcquireAvailableForSaleSecurities	2713546000	USD
CY2010	us-gaap	Payments To Acquire Available For Sale Securities PaymentsToAcquireAvailableForSaleSecurities	4207000000	USD
CY2011	us-gaap	Payments To Acquire Loans Receivable PaymentsToAcquireLoansReceivable	675298000	USD
CY2010	us-gaap	Payments To Acquire Loans Receivable PaymentsToAcquireLoansReceivable	861490000	USD
CY2011	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	10507000	USD
CY2010	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	90931000	USD
CY2011	ewbc	Investments In Affordable Housing Partnerships InvestmentsInAffordableHousingPartnerships	36642000	USD
CY2010	ewbc	Investments In Affordable Housing Partnerships InvestmentsInAffordableHousingPartnerships	42833000	USD
CY2011	us-gaap	Proceeds From Sale Of Available For Sale Securities ProceedsFromSaleOfAvailableForSaleSecurities	702616000	USD
CY2010	us-gaap	Proceeds From Sale Of Available For Sale Securities ProceedsFromSaleOfAvailableForSaleSecurities	1338910000	USD
CY2011	us-gaap	Proceeds From Sale Of Loans Receivable ProceedsFromSaleOfLoansReceivable	188407000	USD
CY2010	us-gaap	Proceeds From Sale Of Loans Receivable ProceedsFromSaleOfLoansReceivable	473961000	USD
CY2011	ewbc	Loans Held For Sale Originated For Investment LoansHeldForSaleOriginatedForInvestment	611291000	USD
CY2010	ewbc	Loans Held For Sale Originated For Investment LoansHeldForSaleOriginatedForInvestment	367404000	USD
CY2011	us-gaap	Proceeds From Sale Of Other Real Estate ProceedsFromSaleOfOtherRealEstate	177015000	USD
CY2010	us-gaap	Proceeds From Sale Of Other Real Estate ProceedsFromSaleOfOtherRealEstate	140710000	USD
CY2011	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	9227000	USD
CY2010	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	112000	USD
CY2011	ewbc	Proceeds From Sale Of Investments In Affordable Housing Partnerships ProceedsFromSaleOfInvestmentsInAffordableHousingPartnerships	7100000	USD
CY2010	ewbc	Proceeds From Sale Of Investments In Affordable Housing Partnerships ProceedsFromSaleOfInvestmentsInAffordableHousingPartnerships	2000000	USD
CY2011	us-gaap	Proceeds From Sale Of Other Investments ProceedsFromSaleOfOtherInvestments	2454000	USD
CY2011	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	1780457000	USD
CY2010	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	2564157000	USD
CY2011	ewbc	Proceeds From Paydown Maturities And Termination Of Securities Purchased Under Resale Agreements ProceedsFromPaydownMaturitiesAndTerminationOfSecuritiesPurchasedUnderResaleAgreements	1005632000	USD
CY2010	ewbc	Proceeds From Paydown Maturities And Termination Of Securities Purchased Under Resale Agreements ProceedsFromPaydownMaturitiesAndTerminationOfSecuritiesPurchasedUnderResaleAgreements	680000000	USD
CY2011	us-gaap	Payments For Proceeds From Federal Home Loan Bank Stock PaymentsForProceedsFromFederalHomeLoanBankStock	-25908000	USD
CY2010	us-gaap	Payments For Proceeds From Federal Home Loan Bank Stock PaymentsForProceedsFromFederalHomeLoanBankStock	-20075000	USD
CY2011	us-gaap	Net Cash Provided By Used In Investing Activities Continuing Operations NetCashProvidedByUsedInInvestingActivitiesContinuingOperations	-1071226000	USD
CY2010	us-gaap	Net Cash Provided By Used In Investing Activities Continuing Operations NetCashProvidedByUsedInInvestingActivitiesContinuingOperations	93233000	USD
CY2011	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	1812375000	USD
CY2010	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	254985000	USD
CY2011	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	-63337000	USD
CY2010	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	40095000	USD
CY2010	us-gaap	Proceeds From Federal Home Loan Bank Borrowings ProceedsFromFederalHomeLoanBankBorrowings	550000000	USD
CY2011	us-gaap	Proceeds From Issuance Of Shares Under Incentive And Share Based Compensation Plans Including Stock Options ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions	5726000	USD
CY2010	us-gaap	Proceeds From Issuance Of Shares Under Incentive And Share Based Compensation Plans Including Stock Options ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions	4454000	USD
CY2011	us-gaap	Repayments Of Federal Home Loan Bank Borrowings RepaymentsOfFederalHomeLoanBankBorrowings	760274000	USD
CY2010	us-gaap	Repayments Of Federal Home Loan Bank Borrowings RepaymentsOfFederalHomeLoanBankBorrowings	1198312000	USD
CY2011	us-gaap	Repayments Of Other Long Term Debt RepaymentsOfOtherLongTermDebt	23918000	USD
CY2010	us-gaap	Payments For Repurchase Of Redeemable Preferred Stock PaymentsForRepurchaseOfRedeemablePreferredStock	306546000	USD
CY2012	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-2550000	USD
CY2012	ewbc	Loans Receivable Nonaccrual Of Interest On Nonaccrual Loans LoansReceivableNonaccrualOfInterestOnNonaccrualLoans	7206000	USD
CY2011	ewbc	Loans Receivable Nonaccrual Of Interest On Nonaccrual Loans LoansReceivableNonaccrualOfInterestOnNonaccrualLoans	9384000	USD
CY2010	ewbc	Loans Receivable Nonaccrual Of Interest On Nonaccrual Loans LoansReceivableNonaccrualOfInterestOnNonaccrualLoans	12689000	USD
CY2012	ewbc	Loans Receivable Interest Recognized On Nonaccrual Loans LoansReceivableInterestRecognizedOnNonaccrualLoans	2269000	USD
CY2011	ewbc	Loans Receivable Interest Recognized On Nonaccrual Loans LoansReceivableInterestRecognizedOnNonaccrualLoans	3519000	USD
CY2010Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	1333949000	USD
CY2009Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	1099084000	USD
CY2011	us-gaap	Payments Of Ordinary Dividends PaymentsOfOrdinaryDividends	30679000	USD
CY2010	us-gaap	Payments Of Ordinary Dividends PaymentsOfOrdinaryDividends	29605000	USD
CY2011	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	68000	USD
CY2010	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-1377000	USD
CY2011	us-gaap	Net Cash Provided By Used In Financing Activities Continuing Operations NetCashProvidedByUsedInFinancingActivitiesContinuingOperations	914211000	USD
CY2010	us-gaap	Net Cash Provided By Used In Financing Activities Continuing Operations NetCashProvidedByUsedInFinancingActivitiesContinuingOperations	-729671000	USD
CY2011	us-gaap	Effect Of Exchange Rate On Cash And Cash Equivalents Continuing Operations EffectOfExchangeRateOnCashAndCashEquivalentsContinuingOperations	-1066000	USD
CY2010	us-gaap	Effect Of Exchange Rate On Cash And Cash Equivalents Continuing Operations EffectOfExchangeRateOnCashAndCashEquivalentsContinuingOperations	2107000	USD
CY2011	us-gaap	Net Cash Provided By Used In Continuing Operations NetCashProvidedByUsedInContinuingOperations	97236000	USD
CY2010	us-gaap	Net Cash Provided By Used In Continuing Operations NetCashProvidedByUsedInContinuingOperations	234865000	USD
CY2011	us-gaap	Interest Paid InterestPaid	175772000	USD
CY2010	us-gaap	Interest Paid InterestPaid	206706000	USD
CY2011	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	326725000	USD
CY2010	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	-60621000	USD
CY2011	us-gaap	Transfer To Other Real Estate TransferToOtherRealEstate	175551000	USD
CY2010	us-gaap	Transfer To Other Real Estate TransferToOtherRealEstate	270995000	USD
CY2011	us-gaap	Conversion Of Stock Amount Converted1 ConversionOfStockAmountConverted1	31000	USD
CY2010	us-gaap	Conversion Of Stock Amount Converted1 ConversionOfStockAmountConverted1	325299000	USD
CY2011	us-gaap	Mortgage Loan Related To Property Sales1 MortgageLoanRelatedToPropertySales1	8882000	USD
CY2010	us-gaap	Mortgage Loan Related To Property Sales1 MortgageLoanRelatedToPropertySales1	15888000	USD
CY2011	us-gaap	Loans Assumed1 LoansAssumed1	27149000	USD
CY2010	us-gaap	Loans Assumed1 LoansAssumed1	45522000	USD
CY2011	ewbc	Loans To Facilitate Sales Of Premises And Equipment LoansToFacilitateSalesOfPremisesAndEquipment	11100000	USD
CY2011	us-gaap	Transfer Of Portfolio Loans And Leases To Held For Sale1 TransferOfPortfolioLoansAndLeasesToHeldForSale1	644915000	USD
CY2010	us-gaap	Transfer Of Portfolio Loans And Leases To Held For Sale1 TransferOfPortfolioLoansAndLeasesToHeldForSale1	563974000	USD
CY2011	us-gaap	Stock Issued1 StockIssued1	520000	USD
CY2010	us-gaap	Stock Issued1 StockIssued1	281000	USD
CY2010	us-gaap	Preferred Stock Accretion Of Redemption Discount PreferredStockAccretionOfRedemptionDiscount	21042000	USD
CY2012	us-gaap	Repayments Of Federal Home Loan Bank Borrowings RepaymentsOfFederalHomeLoanBankBorrowings	100857000	USD
CY2012	us-gaap	Proceeds From Issuance Of Private Placement ProceedsFromIssuanceOfPrivatePlacement	0	USD
CY2011	us-gaap	Payments For Repurchase Of Warrants PaymentsForRepurchaseOfWarrants	14500000	USD
CY2012	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	199950000	USD
CY2012Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	1323106000	USD
CY2012Q4	us-gaap	Stockholders Equity StockholdersEquity	2382122000	USD
CY2010	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	8480000	USD
CY2011	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	13543000	USD
CY2012	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	12668000	USD
CY2010	us-gaap	Adjustment To Additional Paid In Capital Income Tax Effect From Share Based Compensation Net AdjustmentToAdditionalPaidInCapitalIncomeTaxEffectFromShareBasedCompensationNet	-170000	USD
CY2012	us-gaap	Adjustment To Additional Paid In Capital Income Tax Effect From Share Based Compensation Net AdjustmentToAdditionalPaidInCapitalIncomeTaxEffectFromShareBasedCompensationNet	462000	USD
CY2011	us-gaap	Adjustment To Additional Paid In Capital Income Tax Effect From Share Based Compensation Net AdjustmentToAdditionalPaidInCapitalIncomeTaxEffectFromShareBasedCompensationNet	717000	USD
CY2010	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	4454000	USD
CY2011	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	5206000	USD
CY2012	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	3821000	USD
CY2010	ewbc	Stock Issued During Period Value Director Retainer Fee StockIssuedDuringPeriodValueDirectorRetainerFee	281000	USD
CY2012	ewbc	Stock Issued During Period Value Director Retainer Fee StockIssuedDuringPeriodValueDirectorRetainerFee	570000	USD
CY2011	ewbc	Stock Issued During Period Value Director Retainer Fee StockIssuedDuringPeriodValueDirectorRetainerFee	520000	USD
CY2010	us-gaap	Adjustments Related To Tax Withholding For Share Based Compensation AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	1207000	USD
CY2012	us-gaap	Adjustments Related To Tax Withholding For Share Based Compensation AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	3012000	USD
CY2011	us-gaap	Adjustments Related To Tax Withholding For Share Based Compensation AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	649000	USD
CY2010	us-gaap	Dividends Preferred Stock DividendsPreferredStock	22084000	USD
CY2011	us-gaap	Dividends Preferred Stock DividendsPreferredStock	6857000	USD
CY2012	us-gaap	Dividends Preferred Stock DividendsPreferredStock	6857000	USD
CY2010	us-gaap	Dividends Common Stock DividendsCommonStock	5545000	USD
CY2011	us-gaap	Dividends Common Stock DividendsCommonStock	23876000	USD
CY2010	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	306488000	USD
CY2011	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	14500000	USD
CY2012	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	199950000	USD
CY2012	us-gaap	Stock Issued During Period Shares Share Based Compensation Gross StockIssuedDuringPeriodSharesShareBasedCompensationGross	336031	shares
CY2010	us-gaap	Stock Issued During Period Shares Share Based Compensation Gross StockIssuedDuringPeriodSharesShareBasedCompensationGross	1867194	shares
CY2011	us-gaap	Stock Issued During Period Shares Share Based Compensation Gross StockIssuedDuringPeriodSharesShareBasedCompensationGross	1024925	shares
CY2012	ewbc	Stock Issued During Period Shares Director Retainer Fee StockIssuedDuringPeriodSharesDirectorRetainerFee	26151	shares
CY2010	ewbc	Stock Issued During Period Shares Director Retainer Fee StockIssuedDuringPeriodSharesDirectorRetainerFee	17910	shares
CY2011	ewbc	Stock Issued During Period Shares Director Retainer Fee StockIssuedDuringPeriodSharesDirectorRetainerFee	27831	shares
CY2012	us-gaap	Stock Issued During Period Shares Restricted Stock Award Forfeited StockIssuedDuringPeriodSharesRestrictedStockAwardForfeited	190634	shares
CY2010	us-gaap	Stock Issued During Period Shares Restricted Stock Award Forfeited StockIssuedDuringPeriodSharesRestrictedStockAwardForfeited	343029	shares
CY2011	us-gaap	Stock Issued During Period Shares Restricted Stock Award Forfeited StockIssuedDuringPeriodSharesRestrictedStockAwardForfeited	240193	shares
CY2012	us-gaap	Shares Paid For Tax Withholding For Share Based Compensation SharesPaidForTaxWithholdingForShareBasedCompensation	137258	shares
CY2010	us-gaap	Shares Paid For Tax Withholding For Share Based Compensation SharesPaidForTaxWithholdingForShareBasedCompensation	65834	shares
CY2011	us-gaap	Shares Paid For Tax Withholding For Share Based Compensation SharesPaidForTaxWithholdingForShareBasedCompensation	29610	shares
CY2011	us-gaap	Stock Repurchased And Retired During Period Shares StockRepurchasedAndRetiredDuringPeriodShares	1517555	shares
CY2012	us-gaap	Treasury Stock Shares Acquired TreasuryStockSharesAcquired	9068105	shares
CY2012Q4	ewbc	Number Of Wholly Owned Statutory Business Trusts NumberOfWhollyOwnedStatutoryBusinessTrusts	7	trust
CY2012	ewbc	Resale Agreement Term Low End Of Range ResaleAgreementTermLowEndOfRange	P1D
CY2012	ewbc	Resale Agreement Maximum Term To Be Classified As Cash And Cash Equivalents ResaleAgreementMaximumTermToBeClassifiedAsCashAndCashEquivalents	P90D
CY2012	ewbc	Resale Agreement Minimum Term To Be Separately Categorized ResaleAgreementMinimumTermToBeSeparatelyCategorized	P90D
CY2012	ewbc	Loans Receivable Non Accrual Status Number Of Past Due Days LoansReceivableNonAccrualStatusNumberOfPastDueDays	P90D
CY2012	ewbc	Real Estate Owned Maximum Foreclosure Period Within Which Sale Is Recognized At Fair Value RealEstateOwnedMaximumForeclosurePeriodWithinWhichSaleIsRecognizedAtFairValue	P3M
CY2012Q4	us-gaap	Equity Method Investment Ownership Percentage EquityMethodInvestmentOwnershipPercentage	0.05	pure
CY2011	ewbc	Number Of Statutory Business Trusts Dissolved NumberOfStatutoryBusinessTrustsDissolved	2	item
CY2012Q4	ewbc	Number Of Statutory Business Trusts NumberOfStatutoryBusinessTrusts	9	item
CY2012	ewbc	More Likely Than Not Minimum Likelihood Percentage MoreLikelyThanNotMinimumLikelihoodPercentage	0.50	pure
CY2011Q4	us-gaap	Cash And Due From Banks CashAndDueFromBanks	761892000	USD
CY2012Q4	us-gaap	Cash And Due From Banks CashAndDueFromBanks	933050000	USD
CY2012Q4	us-gaap	Other Cash Equivalents At Carrying Value OtherCashEquivalentsAtCarryingValue	386530000	USD
CY2012Q4	ewbc	Short Term Investments Average Outstanding Amount ShortTermInvestmentsAverageOutstandingAmount	242937000	USD
CY2011Q4	ewbc	Short Term Investments Average Outstanding Amount ShortTermInvestmentsAverageOutstandingAmount	107893000	USD
CY2012Q4	us-gaap	Short Term Investments ShortTermInvestments	366378000	USD
CY2012Q4	ewbc	Short Term Investments Maximum Month End Outstanding Amount ShortTermInvestmentsMaximumMonthEndOutstandingAmount	367283000	USD
CY2011Q4	us-gaap	Money Market Funds At Carrying Value MoneyMarketFundsAtCarryingValue	621000	USD
CY2012Q4	us-gaap	Money Market Funds At Carrying Value MoneyMarketFundsAtCarryingValue	3526000	USD
CY2011Q4	us-gaap	Other Cash Equivalents At Carrying Value OtherCashEquivalentsAtCarryingValue	668672000	USD
CY2011Q4	ewbc	Short Term Investments Maximum Month End Outstanding Amount ShortTermInvestmentsMaximumMonthEndOutstandingAmount	141627000	USD
CY2011Q4	ewbc	Short Term Investments Weighted Average Interest Rate ShortTermInvestmentsWeightedAverageInterestRate	0.0134	pure
CY2012Q4	ewbc	Short Term Investments Weighted Average Interest Rate ShortTermInvestmentsWeightedAverageInterestRate	0.0264	pure
CY2012Q4	us-gaap	Securities Purchased Under Agreements To Resell SecuritiesPurchasedUnderAgreementsToResell	1450000000	USD
CY2012	us-gaap	Payments For Securities Purchased Under Agreements To Resell PaymentsForSecuritiesPurchasedUnderAgreementsToResell	1400000000	USD
CY2012	ewbc	Proceeds From Paydown Maturities And Termination Of Securities Purchased Under Resale Agreements ProceedsFromPaydownMaturitiesAndTerminationOfSecuritiesPurchasedUnderResaleAgreements	736434000	USD
CY2012	us-gaap	Interest Income Securities Purchased Under Agreements To Resell InterestIncomeSecuritiesPurchasedUnderAgreementsToResell	20392000	USD
CY2009Q4	us-gaap	Stockholders Equity StockholdersEquity	2284659000	USD
CY2012	ewbc	Percentage Of Companys Liability For Losses Under Shared Loss Agreements PercentageOfCompanysLiabilityForLossesUnderSharedLossAgreements	0.20	pure
CY2011	ewbc	Percentage Of Companys Liability For Losses Under Shared Loss Agreements PercentageOfCompanysLiabilityForLossesUnderSharedLossAgreements	0.20	pure
CY2011	ewbc	Total Eligible Losses Subject To Shared Loss Agreements TotalEligibleLossesSubjectToSharedLossAgreements	2200000	USD
CY2012	ewbc	Companys Liability For Losses Under Shared Loss Agreements CompanysLiabilityForLossesUnderSharedLossAgreements	11200000	USD
CY2012	ewbc	Total Eligible Losses Subject To Shared Loss Agreements TotalEligibleLossesSubjectToSharedLossAgreements	26300000	USD
CY2011	ewbc	Companys Liability For Losses Under Shared Loss Agreements CompanysLiabilityForLossesUnderSharedLossAgreements	5300000	USD
CY2011Q4	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	2235000	USD
CY2012Q4	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	4800000	USD
CY2010Q4	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	9027000	USD
CY2012Q4	us-gaap	Cash Surrender Value Of Life Insurance CashSurrenderValueOfLifeInsurance	110133000	USD
CY2012Q4	us-gaap	Other Assets OtherAssets	517718000	USD
CY2011	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Earnings1 FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1	-6293000	USD
CY2012	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Earnings1 FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1	-99000	USD
CY2011	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Other Comprehensive Income Loss FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss	8567000	USD
CY2012	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Other Comprehensive Income Loss FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss	2711000	USD
CY2011	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Sales FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales	9357000	USD
CY2011	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Settlements FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements	-291000	USD
CY2012	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Settlements FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements	47000	USD
CY2011	us-gaap	Fair Value Assets Measured On Recurring Basis Change In Unrealized Gain Loss Included In Investment Income FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLossIncludedInInvestmentIncome	633000	USD
CY2012	us-gaap	Fair Value Assets Measured On Recurring Basis Change In Unrealized Gain Loss Included In Investment Income FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLossIncludedInInvestmentIncome	99000	USD
CY2012Q4	ewbc	Minimum Number Of Quoted Market Prices Used In Determining Fair Value Of Available For Sale Investment Securities MinimumNumberOfQuotedMarketPricesUsedInDeterminingFairValueOfAvailableForSaleInvestmentSecurities	2	item
CY2012Q4	ewbc	Number Of Trust Preferred Securities Included In Level3 Available For Sale Securities NumberOfTrustPreferredSecuritiesIncludedInLevel3AvailableForSaleSecurities	4	item
CY2012Q4	ewbc	Percentage Of Total Available For Sale Securities Represented By Level3 Available For Sale Securities PercentageOfTotalAvailableForSaleSecuritiesRepresentedByLevel3AvailableForSaleSecurities	0.01	pure
CY2012Q4	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
CY2012	ewbc	Noncovered Other Real Estate Owned Fair Value Disclosure NoncoveredOtherRealEstateOwnedFairValueDisclosure	32900000	USD
CY2012	ewbc	Covered Other Real Estate Owned Fair Value Disclosure CoveredOtherRealEstateOwnedFairValueDisclosure	26800000	USD
CY2011Q4	ewbc	Hedged Value Of Certificates Of Deposit HedgedValueOfCertificatesOfDeposit	50000000	USD
CY2012	ewbc	Maximum Term Of Maturity For Securities Purchased Under Resale Agreements To Be Included In Cash And Cash Equivalents MaximumTermOfMaturityForSecuritiesPurchasedUnderResaleAgreementsToBeIncludedInCashAndCashEquivalents	P90D
CY2012	ewbc	Term Of Maturity That Securities Purchased Under Resale Agreements Must Exceed To Be Included In Certain Fair Value Calculations TermOfMaturityThatSecuritiesPurchasedUnderResaleAgreementsMustExceedToBeIncludedInCertainFairValueCalculations	P90D
CY2012	ewbc	Maximum Term Of Maturity For Carrying Amount Of Securities Sold Under Repurchase Agreements To Approximate Fair Value MaximumTermOfMaturityForCarryingAmountOfSecuritiesSoldUnderRepurchaseAgreementsToApproximateFairValue	P90D
CY2011Q4	ewbc	Number Of Hedged Certificates Of Deposits NumberOfHedgedCertificatesOfDeposits	4	item
CY2011Q4	us-gaap	Availableforsale Securities Gross Unrealized Gain AvailableforsaleSecuritiesGrossUnrealizedGain	47356000	USD
CY2011Q4	us-gaap	Available For Sale Securities Gross Unrealized Losses1 AvailableForSaleSecuritiesGrossUnrealizedLosses1	107746000	USD
CY2012Q4	us-gaap	Availableforsale Securities Gross Unrealized Gain AvailableforsaleSecuritiesGrossUnrealizedGain	34739000	USD
CY2012Q4	us-gaap	Available For Sale Securities Gross Unrealized Losses1 AvailableForSaleSecuritiesGrossUnrealizedLosses1	26728000	USD
CY2012Q4	us-gaap	Available For Sale Securities AvailableForSaleSecurities	2607029000	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
CY2012	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
CY2012	us-gaap	Available For Sale Securities Gross Realized Gains AvailableForSaleSecuritiesGrossRealizedGains	28200000	USD
CY2012	us-gaap	Available For Sale Securities Gross Realized Losses AvailableForSaleSecuritiesGrossRealizedLosses	27400000	USD
CY2012	us-gaap	Available For Sale Securities Gross Realized Gain Loss Net AvailableForSaleSecuritiesGrossRealizedGainLossNet	757000	USD
CY2012	us-gaap	Available For Sale Securities Gross Realized Gains Losses Sale Proceeds AvailableForSaleSecuritiesGrossRealizedGainsLossesSaleProceeds	1230000000	USD
CY2011	us-gaap	Available For Sale Securities Gross Realized Gains Losses Sale Proceeds AvailableForSaleSecuritiesGrossRealizedGainsLossesSaleProceeds	702600000	USD
CY2011	us-gaap	Available For Sale Securities Gross Realized Gains AvailableForSaleSecuritiesGrossRealizedGains	18100000	USD
CY2011	us-gaap	Available For Sale Securities Gross Realized Losses AvailableForSaleSecuritiesGrossRealizedLosses	8400000	USD
CY2011	us-gaap	Available For Sale Securities Gross Realized Gain Loss Net AvailableForSaleSecuritiesGrossRealizedGainLossNet	9700000	USD
CY2011Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue	1108347000	USD
CY2011Q4	us-gaap	Availableforsale Securities Continuous Unrealized Loss Position Less Than12 Months Aggregate Losses2 AvailableforsaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses2	63558000	USD
CY2011Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue	359776000	USD
CY2011Q4	us-gaap	Availableforsale Securities Continuous Unrealized Loss Position12 Months Or Longer Aggregate Losses2 AvailableforsaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses2	44188000	USD
CY2011Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue	1468123000	USD
CY2011Q4	us-gaap	Availableforsale Securities Continuous Unrealized Loss Position Aggregate Losses2 AvailableforsaleSecuritiesContinuousUnrealizedLossPositionAggregateLosses2	107746000	USD
CY2012Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue	620165000	USD
CY2012Q4	us-gaap	Availableforsale Securities Continuous Unrealized Loss Position Less Than12 Months Aggregate Losses2 AvailableforsaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses2	6989000	USD
CY2012Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue	195271000	USD
CY2012Q4	us-gaap	Availableforsale Securities Continuous Unrealized Loss Position12 Months Or Longer Aggregate Losses2 AvailableforsaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses2	19739000	USD
CY2012Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue	815436000	USD
CY2012Q4	us-gaap	Availableforsale Securities Continuous Unrealized Loss Position Aggregate Losses2 AvailableforsaleSecuritiesContinuousUnrealizedLossPositionAggregateLosses2	26728000	USD
CY2012Q4	ewbc	Number Of Securities In Continuous Unrealized Loss Position For More Than Twelve Months NumberOfSecuritiesInContinuousUnrealizedLossPositionForMoreThanTwelveMonths	13	item
CY2012Q4	ewbc	Number Of Individual Securities With Continuous Unrealized Loss Position NumberOfIndividualSecuritiesWithContinuousUnrealizedLossPosition	77	item
CY2011Q4	ewbc	Number Of Securities In Continuous Unrealized Loss Position For More Than Twelve Months NumberOfSecuritiesInContinuousUnrealizedLossPositionForMoreThanTwelveMonths	24	item
CY2011Q4	ewbc	Number Of Individual Securities With Continuous Unrealized Loss Position NumberOfIndividualSecuritiesWithContinuousUnrealizedLossPosition	116	item
CY2012Q4	us-gaap	Available For Sale Securities Debt Maturities Within One Year Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost	208557000	USD
CY2012Q4	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost	535748000	USD
CY2012Q4	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost	623366000	USD
CY2012Q4	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost	1231347000	USD
CY2012Q4	us-gaap	Available For Sale Securities Debt Maturities Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAmortizedCost	2599018000	USD
CY2012Q4	us-gaap	Available For Sale Securities Debt Maturities Within One Year Fair Value AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue	204931000	USD
CY2012Q4	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	536156000	USD
CY2012Q4	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue	615309000	USD
CY2012Q4	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue	1250633000	USD
CY2012Q4	ewbc	Available For Sale Securities Debt Maturities Fair Value Total AvailableForSaleSecuritiesDebtMaturitiesFairValueTotal	2607029000	USD
CY2012	us-gaap	Proceeds From Sale Of Available For Sale Securities ProceedsFromSaleOfAvailableForSaleSecurities	1230134000	USD
CY2012	us-gaap	Gain Loss On Sale Of Securities Net GainLossOnSaleOfSecuritiesNet	757000	USD
CY2011Q4	ewbc	Available For Sale Securities Tax Expense On Sale Of Investment Securities AvailableForSaleSecuritiesTaxExpenseOnSaleOfInvestmentSecurities	4100000	USD
CY2010Q4	ewbc	Available For Sale Securities Tax Expense On Sale Of Investment Securities AvailableForSaleSecuritiesTaxExpenseOnSaleOfInvestmentSecurities	13100000	USD
CY2012Q4	us-gaap	Deposit Liabilities Collateral Issued Financial Instruments DepositLiabilitiesCollateralIssuedFinancialInstruments	1780000000	USD
CY2011Q4	ewbc	Fdic Loss Sharing Receivable FdicLossSharingReceivable	76600000	USD
CY2012Q4	ewbc	Percentage Of Eligible Losses For Which Fdic Is Obligated To Reimburse PercentageOfEligibleLossesForWhichFdicIsObligatedToReimburse	0.80	pure
CY2012Q4	ewbc	Percentage Of Loan Related And Oreo Expenses Recorded As Non Interest Expense PercentageOfLoanRelatedAndOreoExpensesRecordedAsNonInterestExpense	1.00	pure
CY2012Q4	ewbc	Percentage Of Any Reimbursable Expense Recorded As Noninterest Income PercentageOfAnyReimbursableExpenseRecordedAsNoninterestIncome	0.80	pure
CY2012Q4	ewbc	Percentage Of Actual Expense Paid PercentageOfActualExpensePaid	0.20	pure
CY2012Q4	ewbc	Percentage Of Fdic In Recoveries Received PercentageOfFdicInRecoveriesReceived	0.80	pure
CY2012Q4	ewbc	Other Real Estate Owned Net OtherRealEstateOwnedNet	32911000	USD
CY2012Q4	ewbc	Noncovered Real Estate Acquired Through Foreclosure NoncoveredRealEstateAcquiredThroughForeclosure	40600000	USD
CY2011Q4	ewbc	Noncovered Real Estate Acquired Through Foreclosure NoncoveredRealEstateAcquiredThroughForeclosure	38000000	USD
CY2012	ewbc	Write Downs Recorded Related To Real Estate Acquired Through Foreclosure WriteDownsRecordedRelatedToRealEstateAcquiredThroughForeclosure	5100000	USD
CY2011	ewbc	Write Downs Recorded Related To Real Estate Acquired Through Foreclosure WriteDownsRecordedRelatedToRealEstateAcquiredThroughForeclosure	3000000	USD
CY2012	ewbc	Number Of Other Real Estate Owned Properties Sold NumberOfOtherRealEstateOwnedPropertiesSold	47	item
CY2011	ewbc	Number Of Other Real Estate Owned Properties Sold NumberOfOtherRealEstateOwnedPropertiesSold	51	item
CY2010	ewbc	Number Of Other Real Estate Owned Properties Sold NumberOfOtherRealEstateOwnedPropertiesSold	79	item
CY2012	ewbc	Proceeds From Sale Of Non Covered Other Real Estate Owned ProceedsFromSaleOfNonCoveredOtherRealEstateOwned	34100000	USD
CY2011	ewbc	Proceeds From Sale Of Non Covered Other Real Estate Owned ProceedsFromSaleOfNonCoveredOtherRealEstateOwned	26600000	USD
CY2012	ewbc	Gains Losses On Sales Of Other Real Estate Noncovered GainsLossesOnSalesOfOtherRealEstateNoncovered	232000	USD
CY2011	ewbc	Gains Losses On Sales Of Other Real Estate Noncovered GainsLossesOnSalesOfOtherRealEstateNoncovered	-151000	USD
CY2010	ewbc	Gains Losses On Sales Of Other Real Estate Noncovered GainsLossesOnSalesOfOtherRealEstateNoncovered	-145000	USD
CY2010	ewbc	Non Covered Other Real Estate Owned Charges Against Allowance For Loan Losses NonCoveredOtherRealEstateOwnedChargesAgainstAllowanceForLoanLosses	2600000	USD
CY2011	ewbc	Non Covered Other Real Estate Owned Charges Against Allowance For Loan Losses NonCoveredOtherRealEstateOwnedChargesAgainstAllowanceForLoanLosses	780000	USD
CY2012	ewbc	Minimum Compliance Period To Fully Utilize Tax Credits MinimumCompliancePeriodToFullyUtilizeTaxCredits	P15Y
CY2012Q4	ewbc	Investments In Affordable Housing Partnerships Amount InvestmentsInAffordableHousingPartnershipsAmount	185600000	USD
CY2011Q4	ewbc	Investments In Affordable Housing Partnerships Amount InvestmentsInAffordableHousingPartnershipsAmount	144400000	USD
CY2012Q4	ewbc	Investments In Affordable Housing Partnerships Other InvestmentsInAffordableHousingPartnershipsOther	45900000	USD
CY2011Q4	ewbc	Investments In Affordable Housing Partnerships Other InvestmentsInAffordableHousingPartnershipsOther	49700000	USD
CY2012Q4	us-gaap	Fair Value Investments Entities That Calculate Net Asset Value Per Share Unfunded Committments FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareUnfundedCommittments	84600000	USD
CY2011Q4	us-gaap	Fair Value Investments Entities That Calculate Net Asset Value Per Share Unfunded Committments FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareUnfundedCommittments	86000000	USD
CY2012Q4	us-gaap	Equity Method Investments EquityMethodInvestments	142507000	USD
CY2011Q4	us-gaap	Deposit Liabilities Collateral Issued Financial Instruments DepositLiabilitiesCollateralIssuedFinancialInstruments	2170000000	USD
CY2012Q4	us-gaap	Loans And Leases Receivable Net Reported Amount Covered LoansAndLeasesReceivableNetReportedAmountCovered	2935595000	USD
CY2012Q4	ewbc	Additional Advances Under Shared Loss Agreements AdditionalAdvancesUnderSharedLossAgreements	431700000	USD
CY2012Q4	ewbc	Allowance Allocated To Additional Advances AllowanceAllocatedToAdditionalAdvances	5200000	USD
CY2012Q4	ewbc	Percentage Of Allowance Allocated To Additional Advances PercentageOfAllowanceAllocatedToAdditionalAdvances	0.022	pure
CY2011Q4	ewbc	Covered Nonaccrual Loans CoveredNonaccrualLoans	194506000	USD
CY2012Q4	ewbc	Covered Nonaccrual Loans CoveredNonaccrualLoans	204310000	USD
CY2011Q4	ewbc	Total Nonperforming Loans TotalNonperformingLoans	194506000	USD
CY2012Q4	ewbc	Total Nonperforming Loans TotalNonperformingLoans	204310000	USD
CY2012Q4	ewbc	Other Real Estate Owned Covered Net OtherRealEstateOwnedCoveredNet	26808000	USD
CY2011Q4	ewbc	Total Covered Nonperforming Assets TotalCoveredNonperformingAssets	258130000	USD
CY2012Q4	ewbc	Total Covered Nonperforming Assets TotalCoveredNonperformingAssets	231118000	USD
CY2012Q4	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield	556986000	USD
CY2011Q4	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield	785165000	USD
CY2010Q4	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield	1153272000	USD
CY2012	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield Accretion CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldAccretion	193591000	USD
CY2011	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield Accretion CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldAccretion	208887000	USD
CY2012	ewbc	Changes In Expected Cash Flows ChangesInExpectedCashFlows	34588000	USD
CY2011	ewbc	Changes In Expected Cash Flows ChangesInExpectedCashFlows	159220000	USD
CY2012	ewbc	Amount Of Loans Removed From Covered Loans AmountOfLoansRemovedFromCoveredLoans	924700000	USD
CY2011	ewbc	Amount Of Loans Removed From Covered Loans AmountOfLoansRemovedFromCoveredLoans	932200000	USD
CY2010	ewbc	Amount Of Loans Removed From Covered Loans AmountOfLoansRemovedFromCoveredLoans	1330000000	USD
CY2012Q4	us-gaap	Fdic Indemnification Asset FDICIndemnificationAsset	316313000	USD
CY2010Q4	us-gaap	Fdic Indemnification Asset FDICIndemnificationAsset	785035000	USD
CY2012	ewbc	Reductions Reductions	143988000	USD
CY2011	ewbc	Reductions Reductions	210365000	USD
CY2012	ewbc	Fdic Repayments FdicRepayments	17019000	USD
CY2011	ewbc	Fdic Repayments FdicRepayments	3606000	USD
CY2012Q4	ewbc	Fdic Loss Sharing Receivable FdicLossSharingReceivable	73100000	USD
CY2012Q4	us-gaap	Cost Method Investments CostMethodInvestments	42591000	USD
CY2011	ewbc	Number Of Equity Method Investments NumberOfEquityMethodInvestments	26	item
CY2011	ewbc	Number Of Cost Method Investments NumberOfCostMethodInvestments	17	item
CY2011	ewbc	Number Of Investments In Affordable Housing Partnerships NumberOfInvestmentsInAffordableHousingPartnerships	43	item
CY2012Q4	ewbc	Investment In Affordable Housing Partnerships InvestmentInAffordableHousingPartnerships	185645000	USD
CY2012Q4	ewbc	Aggregate Tax Credit Partnerships AggregateTaxCreditPartnerships	185098000	USD
CY2012Q4	ewbc	Tax Exempt Bonds TaxExemptBonds	547000	USD
CY2012	ewbc	Number Of Equity Method Investments NumberOfEquityMethodInvestments	35	item
CY2012	ewbc	Number Of Cost Method Investments NumberOfCostMethodInvestments	16	item
CY2012	ewbc	Number Of Investments In Affordable Housing Partnerships NumberOfInvestmentsInAffordableHousingPartnerships	51	item
CY2011Q4	us-gaap	Equity Method Investments EquityMethodInvestments	94874000	USD
CY2011Q4	us-gaap	Cost Method Investments CostMethodInvestments	48587000	USD
CY2011Q4	ewbc	Aggregate Tax Credit Partnerships AggregateTaxCreditPartnerships	143461000	USD
CY2011Q4	ewbc	Tax Exempt Bonds TaxExemptBonds	984000	USD
CY2011Q4	ewbc	Noncovered Loans Receivable Gross NoncoveredLoansReceivableGross	10288426000	USD
CY2012Q4	ewbc	Noncovered Loans Receivable Gross NoncoveredLoansReceivableGross	11958873000	USD
CY2011Q4	us-gaap	Unamortized Loan Commitment And Origination Fees And Unamortized Discounts Or Premiums UnamortizedLoanCommitmentAndOriginationFeesAndUnamortizedDiscountsOrPremiums	-16762000	USD
CY2012Q4	us-gaap	Unamortized Loan Commitment And Origination Fees And Unamortized Discounts Or Premiums UnamortizedLoanCommitmentAndOriginationFeesAndUnamortizedDiscountsOrPremiums	-19301000	USD
CY2012Q4	us-gaap	Loans And Leases Receivable Net Reported Amount LoansAndLeasesReceivableNetReportedAmount	11710190000	USD
CY2011Q4	ewbc	Accrued Interest On Loans Receivable AccruedInterestOnLoansReceivable	68500000	USD
CY2012Q4	ewbc	Accrued Interest On Loans Receivable AccruedInterestOnLoansReceivable	76800000	USD
CY2011Q4	us-gaap	Loans Pledged As Collateral LoansPledgedAsCollateral	8650000000	USD
CY2012Q4	us-gaap	Loans Pledged As Collateral LoansPledgedAsCollateral	8880000000	USD
CY2012Q4	ewbc	Noncovered Commercial Real Estate Loans And Noncovered Residential Loans Secured By Real Properties Located In California Concentration Risk Percentage NoncoveredCommercialRealEstateLoansAndNoncoveredResidentialLoansSecuredByRealPropertiesLocatedInCaliforniaConcentrationRiskPercentage	0.89	pure
CY2012	ewbc	Loans Acquired During Period LoansAcquiredDuringPeriod	591200000	USD
CY2012	ewbc	Carrying Amount Of Loans Acquired CarryingAmountOfLoansAcquired	564800000	USD
CY2012Q4	ewbc	Percentage Of Purchased Loans Classified As Student Loans PercentageOfPurchasedLoansClassifiedAsStudentLoans	0.94	pure
CY2012Q4	us-gaap	Loans Receivable Held For Sale Net LoansReceivableHeldForSaleNet	174317000	USD
CY2012Q4	ewbc	Percentage Of Loans Held For Sale That Were Originally Classified As Student Loans PercentageOfLoansHeldForSaleThatWereOriginallyClassifiedAsStudentLoans	0.96	pure
CY2012	us-gaap	Proceeds From Sale Of Loans Held For Sale ProceedsFromSaleOfLoansHeldForSale	351900000	USD
CY2012	us-gaap	Transfer Of Portfolio Loans And Leases To Held For Sale1 TransferOfPortfolioLoansAndLeasesToHeldForSale1	144131000	USD
CY2012	us-gaap	Gain Loss On Sale Of Loans And Leases GainLossOnSaleOfLoansAndLeases	14600000	USD
CY2011	us-gaap	Proceeds From Sale Of Loans Held For Sale ProceedsFromSaleOfLoansHeldForSale	652700000	USD
CY2011	us-gaap	Gain Loss On Sale Of Loans And Leases GainLossOnSaleOfLoansAndLeases	14500000	USD
CY2010	us-gaap	Proceeds From Sale Of Loans Held For Sale ProceedsFromSaleOfLoansHeldForSale	409500000	USD
CY2010	us-gaap	Gain Loss On Sale Of Loans And Leases GainLossOnSaleOfLoansAndLeases	18500000	USD
CY2012Q4	ewbc	Number Of Grades Risk Rating System NumberOfGradesRiskRatingSystem	8	item
CY2012	ewbc	Maximum Term Loan Graded Special Mention MaximumTermLoanGradedSpecialMention	P6M
CY2012Q4	ewbc	Increase Decrease In Non Covered Loans Graded Substandard And Doubtful IncreaseDecreaseInNonCoveredLoansGradedSubstandardAndDoubtful	27000000	USD
CY2012Q4	ewbc	Percentage Increase Decrease In Non Covered Loans Graded Substandard And Doubtful PercentageIncreaseDecreaseInNonCoveredLoansGradedSubstandardAndDoubtful	0.05	pure
CY2011Q4	us-gaap	Financing Receivable Recorded Investment30 To59 Days Past Due FinancingReceivableRecordedInvestment30To59DaysPastDue	33117000	USD
CY2012	ewbc	Number Of Days Following Anniversary NumberOfDaysFollowingAnniversary	P45D
CY2012Q4	ewbc	Percentage Of Excess PercentageOfExcess	0.50	pure
CY2012Q4	ewbc	Percentage Of Intrinsic Loss Estimate PercentageOfIntrinsicLossEstimate	0.20	pure
CY2012Q4	ewbc	Percentage Of Asset Discount PercentageOfAssetDiscount	0.25	pure
CY2012Q4	ewbc	Percentage Of Cumulative Shared Loss Payments PercentageOfCumulativeSharedLossPayments	0.25	pure
CY2012Q4	ewbc	Estimated Liability That Will Be Due To Fdic For Specific Thresholds Of Losses Not Being Reached EstimatedLiabilityThatWillBeDueToFdicForSpecificThresholdsOfLossesNotBeingReached	27700000	USD
CY2011Q4	ewbc	Estimated Liability That Will Be Due To Fdic For Specific Thresholds Of Losses Not Being Reached EstimatedLiabilityThatWillBeDueToFdicForSpecificThresholdsOfLossesNotBeingReached	10700000	USD
CY2011Q4	us-gaap	Loans And Leases Receivable Gross Carrying Amount Covered LoansAndLeasesReceivableGrossCarryingAmountCovered	4718084000	USD
CY2011Q4	ewbc	Covered Discount CoveredDiscount	788295000	USD
CY2011Q4	ewbc	Net Valuation Of Loans NetValuationOfLoans	3929789000	USD
CY2012Q4	us-gaap	Loans And Leases Receivable Gross Carrying Amount Covered LoansAndLeasesReceivableGrossCarryingAmountCovered	3450956000	USD
CY2012Q4	ewbc	Covered Discount CoveredDiscount	510208000	USD
CY2012Q4	ewbc	Net Valuation Of Loans NetValuationOfLoans	2940748000	USD
CY2012Q4	us-gaap	Financing Receivable Recorded Investment60 To89 Days Past Due FinancingReceivableRecordedInvestment60To89DaysPastDue	9183000	USD
CY2012Q4	us-gaap	Financing Receivable Recorded Investment30 To59 Days Past Due FinancingReceivableRecordedInvestment30To59DaysPastDue	34414000	USD
CY2011Q4	us-gaap	Financing Receivable Recorded Investment60 To89 Days Past Due FinancingReceivableRecordedInvestment60To89DaysPastDue	7210000	USD
CY2011Q4	ewbc	Financing Receivable Past Due And Still Accruing FinancingReceivablePastDueAndStillAccruing	40327000	USD
CY2012Q4	ewbc	Financing Receivable Past Due And Still Accruing FinancingReceivablePastDueAndStillAccruing	43597000	USD
CY2011Q4	ewbc	Financing Receivable Less Than90 Days Past Due And Not Accruing FinancingReceivableLessThan90DaysPastDueAndNotAccruing	45786000	USD
CY2012Q4	ewbc	Financing Receivable Less Than90 Days Past Due And Not Accruing FinancingReceivableLessThan90DaysPastDueAndNotAccruing	27207000	USD
CY2011Q4	ewbc	Financing Receivable90 Days Or More Past Due And Not Accruing FinancingReceivable90DaysOrMorePastDueAndNotAccruing	99846000	USD
CY2012Q4	ewbc	Financing Receivable90 Days Or More Past Due And Not Accruing FinancingReceivable90DaysOrMorePastDueAndNotAccruing	80902000	USD
CY2011Q4	ewbc	Financing Receivable Not Accruing FinancingReceivableNotAccruing	145632000	USD
CY2012Q4	ewbc	Financing Receivable Not Accruing FinancingReceivableNotAccruing	108109000	USD
CY2011Q4	us-gaap	Financing Receivable Recorded Investment Current FinancingReceivableRecordedInvestmentCurrent	10381070000	USD
CY2012Q4	us-gaap	Financing Receivable Recorded Investment Current FinancingReceivableRecordedInvestmentCurrent	11981484000	USD
CY2011Q4	ewbc	Financing Receivable Non Covered Loans And Loans Held For Sale Gross FinancingReceivableNonCoveredLoansAndLoansHeldForSaleGross	10567029000	USD
CY2012Q4	ewbc	Financing Receivable Non Covered Loans And Loans Held For Sale Gross FinancingReceivableNonCoveredLoansAndLoansHeldForSaleGross	12133190000	USD
CY2011Q4	ewbc	Financing Receivable Recorded Investment Non Covered Loans And Loans Held For Sale Net FinancingReceivableRecordedInvestmentNonCoveredLoansAndLoansHeldForSaleNet	10550267000	USD
CY2012Q4	ewbc	Financing Receivable Recorded Investment Non Covered Loans And Loans Held For Sale Net FinancingReceivableRecordedInvestmentNonCoveredLoansAndLoansHeldForSaleNet	12113889000	USD
CY2010	ewbc	Loans Receivable Interest Recognized On Nonaccrual Loans LoansReceivableInterestRecognizedOnNonaccrualLoans	7880000	USD
CY2012	ewbc	Financing Receivable Restructured Note Split Number FinancingReceivableRestructuredNoteSplitNumber	2	item
CY2012Q4	ewbc	Percentage Of Allowance For Loan Losses Allocated To Covered Loans PercentageOfAllowanceForLoanLossesAllocatedToCoveredLoans	0.022	pure
CY2012Q4	us-gaap	Impaired Financing Receivable Recorded Investment ImpairedFinancingReceivableRecordedInvestment	200496000	USD
CY2011Q4	us-gaap	Impaired Financing Receivable Recorded Investment ImpairedFinancingReceivableRecordedInvestment	219580000	USD
CY2012Q4	us-gaap	Impaired Financing Receivable Unpaid Principal Balance ImpairedFinancingReceivableUnpaidPrincipalBalance	235040000	USD
CY2011Q4	us-gaap	Impaired Financing Receivable Unpaid Principal Balance ImpairedFinancingReceivableUnpaidPrincipalBalance	279181000	USD
CY2011Q4	us-gaap	Impaired Financing Receivable With No Related Allowance Recorded Investment ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment	189175000	USD
CY2012Q4	us-gaap	Impaired Financing Receivable With No Related Allowance Recorded Investment ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment	167147000	USD
CY2012Q4	us-gaap	Impaired Financing Receivable With Related Allowance Recorded Investment ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment	33349000	USD
CY2011Q4	us-gaap	Impaired Financing Receivable With Related Allowance Recorded Investment ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment	30405000	USD
CY2012Q4	us-gaap	Impaired Financing Receivable Related Allowance ImpairedFinancingReceivableRelatedAllowance	11527000	USD
CY2011Q4	us-gaap	Impaired Financing Receivable Related Allowance ImpairedFinancingReceivableRelatedAllowance	13041000	USD
CY2012	us-gaap	Impaired Financing Receivable Average Recorded Investment ImpairedFinancingReceivableAverageRecordedInvestment	213957000	USD
CY2011	us-gaap	Impaired Financing Receivable Average Recorded Investment ImpairedFinancingReceivableAverageRecordedInvestment	252418000	USD
CY2012	us-gaap	Impaired Financing Receivable Interest Income Cash Basis Method ImpairedFinancingReceivableInterestIncomeCashBasisMethod	2269000	USD
CY2011	us-gaap	Impaired Financing Receivable Interest Income Cash Basis Method ImpairedFinancingReceivableInterestIncomeCashBasisMethod	3519000	USD
CY2011Q4	ewbc	Percentage Of Allowance For Loan Losses Allocated To Covered Loans PercentageOfAllowanceForLoanLossesAllocatedToCoveredLoans	0.031	pure
CY2012	ewbc	Provision For Loan Lease And Other Losses Covered ProvisionForLoanLeaseAndOtherLossesCovered	-5016000	USD
CY2012	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	65184000	USD
CY2012	us-gaap	Allowance For Loan And Lease Losses Provision For Loss Net AllowanceForLoanAndLeaseLossesProvisionForLossNet	48735000	USD
CY2011	us-gaap	Allowance For Loan And Lease Losses Provision For Loss Net AllowanceForLoanAndLeaseLossesProvisionForLossNet	112068000	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
CY2012Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	234535000	USD
CY2011	ewbc	Financing Receivable Allowance For Credit Losses Allowance For Unfunded Loan Commitments And Letters Of Credit FinancingReceivableAllowanceForCreditLossesAllowanceForUnfundedLoanCommitmentsAndLettersOfCredit	1048000	USD
CY2012	ewbc	Financing Receivable Allowance For Credit Losses Allowance For Unfunded Loan Commitments And Letters Of Credit FinancingReceivableAllowanceForCreditLossesAllowanceForUnfundedLoanCommitmentsAndLettersOfCredit	-1563000	USD
CY2012	us-gaap	Allowance For Loan And Lease Losses Provision For Loss Gross AllowanceForLoanAndLeaseLossesProvisionForLossGross	64912000	USD
CY2011	us-gaap	Allowance For Loan And Lease Losses Provision For Loss Gross AllowanceForLoanAndLeaseLossesProvisionForLossGross	124691000	USD
CY2012	us-gaap	Allowance For Loan And Lease Losses Recoveries Of Bad Debts AllowanceForLoanAndLeaseLossesRecoveriesOfBadDebts	16177000	USD
CY2011	us-gaap	Allowance For Loan And Lease Losses Recoveries Of Bad Debts AllowanceForLoanAndLeaseLossesRecoveriesOfBadDebts	12623000	USD
CY2012Q4	us-gaap	Financing Receivable Allowance For Credit Losses Individually Evaluated For Impairment1 FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1	11527000	USD
CY2011Q4	us-gaap	Financing Receivable Allowance For Credit Losses Individually Evaluated For Impairment1 FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1	13041000	USD
CY2011Q4	us-gaap	Financing Receivable Allowance For Credit Losses Collectively Evaluated For Impairment FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment	203482000	USD
CY2012Q4	us-gaap	Financing Receivable Allowance For Credit Losses Collectively Evaluated For Impairment FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment	223008000	USD
CY2012Q4	us-gaap	Financing Receivable Individually Evaluated For Impairment FinancingReceivableIndividuallyEvaluatedForImpairment	200496000	USD
CY2011Q4	us-gaap	Financing Receivable Individually Evaluated For Impairment FinancingReceivableIndividuallyEvaluatedForImpairment	220613000	USD
CY2012Q4	ewbc	Covered Loans Collectively Evaluated For Impairment CoveredLoansCollectivelyEvaluatedForImpairment	5237000	USD
CY2012Q4	us-gaap	Financing Receivable Collectively Evaluated For Impairment FinancingReceivableCollectivelyEvaluatedForImpairment	12184825000	USD
CY2011Q4	us-gaap	Financing Receivable Collectively Evaluated For Impairment FinancingReceivableCollectivelyEvaluatedForImpairment	10651617000	USD
CY2012Q4	ewbc	Covered Loans Acquired With Deteriorated Credit Quality CoveredLoansAcquiredWithDeterioratedCreditQuality	3019271000	USD
CY2011Q4	ewbc	Covered Loans Acquired With Deteriorated Credit Quality CoveredLoansAcquiredWithDeterioratedCreditQuality	4134280000	USD
CY2012Q4	us-gaap	Loans And Leases Receivable Gross Carrying Amount LoansAndLeasesReceivableGrossCarryingAmount	15409829000	USD
CY2011Q4	us-gaap	Loans And Leases Receivable Gross Carrying Amount LoansAndLeasesReceivableGrossCarryingAmount	15006510000	USD
CY2012Q4	us-gaap	Qualitative And Quantitative Information Asset Or Liability Transferors Continuing Involvement Securitization Or Assetbacked Financing Principal Amount Outstanding Derecognized Amount QualitativeAndQuantitativeInformationAssetOrLiabilityTransferorsContinuingInvolvementSecuritizationOrAssetbackedFinancingPrincipalAmountOutstandingDerecognizedAmount	1650000000	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
CY2012Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	171720000	USD
CY2011Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	178588000	USD
CY2012Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	64203000	USD
CY2011Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	59662000	USD
CY2012Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	107517000	USD
CY2012	us-gaap	Depreciation Depreciation	13200000	USD
CY2011	us-gaap	Depreciation Depreciation	12100000	USD
CY2010	us-gaap	Depreciation Depreciation	13800000	USD
CY2012Q4	us-gaap	Goodwill Goodwill	337438000	USD
CY2012Q4	ewbc	Market Capitalization MarketCapitalization	3140000000	USD
CY2010Q4	us-gaap	Goodwill Goodwill	337438000	USD
CY2011Q4	us-gaap	Deposit Liabilities Accrued Interest DepositLiabilitiesAccruedInterest	7100000	USD
CY2011	ewbc	Interest Expense Interest Bearing Deposit Checking InterestExpenseInterestBearingDepositChecking	3009000	USD
CY2011	us-gaap	Interest Expense Money Market Deposits InterestExpenseMoneyMarketDeposits	20610000	USD
CY2011	us-gaap	Interest Expense Savings Deposits InterestExpenseSavingsDeposits	2988000	USD
CY2011	us-gaap	Interest Expense Time Deposits Less Than100000 InterestExpenseTimeDepositsLessThan100000	29329000	USD
CY2011	us-gaap	Interest Expense Time Deposits100000 Or More InterestExpenseTimeDeposits100000OrMore	51174000	USD
CY2011Q4	ewbc	Time Deposits Within Certificate Of Deposit Account Registry Service Program TimeDepositsWithinCertificateOfDepositAccountRegistryServiceProgram	580900000	USD
CY2010	ewbc	Interest Expense Interest Bearing Deposit Checking InterestExpenseInterestBearingDepositChecking	2349000	USD
CY2010	us-gaap	Interest Expense Money Market Deposits InterestExpenseMoneyMarketDeposits	29514000	USD
CY2010	us-gaap	Interest Expense Savings Deposits InterestExpenseSavingsDeposits	3986000	USD
CY2010	us-gaap	Interest Expense Time Deposits Less Than100000 InterestExpenseTimeDepositsLessThan100000	34958000	USD
CY2010	us-gaap	Interest Expense Time Deposits100000 Or More InterestExpenseTimeDeposits100000OrMore	45930000	USD
CY2012	ewbc	Interest Expense Interest Bearing Deposit Checking InterestExpenseInterestBearingDepositChecking	3163000	USD
CY2012	us-gaap	Interest Expense Money Market Deposits InterestExpenseMoneyMarketDeposits	16984000	USD
CY2012	us-gaap	Interest Expense Savings Deposits InterestExpenseSavingsDeposits	2795000	USD
CY2012	us-gaap	Interest Expense Time Deposits Less Than100000 InterestExpenseTimeDepositsLessThan100000	20655000	USD
CY2012	us-gaap	Interest Expense Time Deposits100000 Or More InterestExpenseTimeDeposits100000OrMore	32298000	USD
CY2012	us-gaap	Interest Expense Deposits InterestExpenseDeposits	75895000	USD
CY2012Q4	ewbc	Time Deposits Within Certificate Of Deposit Account Registry Service Program TimeDepositsWithinCertificateOfDepositAccountRegistryServiceProgram	260500000	USD
CY2011Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary Average Interest Rate Of Amounts Due Within One Year Of Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryAverageInterestRateOfAmountsDueWithinOneYearOfBalanceSheetDate	0.0443	pure
CY2012Q4	us-gaap	Federal Home Loan Bank Advances General Debt Obligations Disclosures Weighted Average Interest Rate FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresWeightedAverageInterestRate	0.0063	pure
CY2011Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary Due From One To Two Years Of Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryDueFromOneToTwoYearsOfBalanceSheetDate	52656000	USD
CY2011Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary Due From Two To Three Years Of Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryDueFromTwoToThreeYearsOfBalanceSheetDate	21557000	USD
CY2011Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary Due From Three To Four Years Of Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryDueFromThreeToFourYearsOfBalanceSheetDate	80662000	USD
CY2012Q4	ewbc	Reversal Of Provision For Loan And Lease Losses ReversalOfProvisionForLoanAndLeaseLosses	-689000	USD
CY2012Q3	ewbc	Reversal Of Provision For Loan And Lease Losses ReversalOfProvisionForLoanAndLeaseLosses	5179000	USD
CY2011Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary Average Interest Rate One To Two Years From Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryAverageInterestRateOneToTwoYearsFromBalanceSheetDate	0.0443	pure
CY2011Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary Average Interest Rate Two To Three Years From Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryAverageInterestRateTwoToThreeYearsFromBalanceSheetDate	0.0446	pure
CY2011Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary Average Interest Rate Three To Four Years From Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryAverageInterestRateThreeToFourYearsFromBalanceSheetDate	0.0396	pure
CY2011Q4	us-gaap	Federal Home Loan Bank Advances General Debt Obligations Disclosures Weighted Average Interest Rate FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresWeightedAverageInterestRate	0.0417	pure
CY2011Q4	us-gaap	Federal Home Loan Bank Advances General Debt Obligations Disclosures Amount Of Available Unused Funds FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresAmountOfAvailableUnusedFunds	3610000000	USD
CY2012Q4	us-gaap	Federal Home Loan Bank Advances General Debt Obligations Disclosures Amount Of Available Unused Funds FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresAmountOfAvailableUnusedFunds	3250000000	USD
CY2012	us-gaap	Early Repayment Of Senior Debt EarlyRepaymentOfSeniorDebt	93000000	USD
CY2012	ewbc	Federal Home Loan Bank Advances Additional Prepayment Penalties FederalHomeLoanBankAdvancesAdditionalPrepaymentPenalties	6800000	USD
CY2011	us-gaap	Early Repayment Of Senior Debt EarlyRepaymentOfSeniorDebt	523500000	USD
CY2011	ewbc	Federal Home Loan Bank Advances Additional Prepayment Penalties FederalHomeLoanBankAdvancesAdditionalPrepaymentPenalties	11800000	USD
CY2012Q4	ewbc	Federal Home Loan Bank Advances Additional Available Borrowing Capacity FederalHomeLoanBankAdvancesAdditionalAvailableBorrowingCapacity	1310000000	USD
CY2011Q4	ewbc	Federal Home Loan Bank Advances Additional Available Borrowing Capacity FederalHomeLoanBankAdvancesAdditionalAvailableBorrowingCapacity	1020000000	USD
CY2012Q1	ewbc	Reversal Of Provision For Loan And Lease Losses ReversalOfProvisionForLoanAndLeaseLosses	1621000	USD
CY2012	us-gaap	Schedule Of Repurchase Agreements ScheduleOfRepurchaseAgreements	<div style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"> <p style="MARGIN: 0in 0in 0pt; TEXT-INDENT: 0.5in; TEXT-ALIGN: justify"> </p> <p style="MARGIN: 0in 0in 0pt"> </p> <table style="MARGIN-LEFT: 0.5in; WIDTH: 868px; BORDER-COLLAPSE: collapse; HEIGHT: 177px" cellspacing="0" cellpadding="0" width="868" border="0"> <tr style="HEIGHT: 0px"> <td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; PADDING-BOTTOM: 0in; WIDTH: 35.82%; PADDING-TOP: 0in" valign="bottom" width="35%"> <p style="MARGIN: 0in 0in 0pt"> </p></td> <td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; PADDING-BOTTOM: 0in; WIDTH: 2.4%; PADDING-TOP: 0in" valign="bottom" width="2%"> <p style="MARGIN: 0in 0in 0pt; TEXT-ALIGN: center" align="center"> </p></td> <td style="BORDER-RIGHT: medium none; PADDING-RIGHT: 0in; BORDER-TOP: medium none; PADDING-LEFT: 0in; PADDING-BOTTOM: 0in; BORDER-LEFT: medium none; WIDTH: 1.48%; PADDING-TOP: 0in; BORDER-BOTTOM: windowtext 1pt solid" valign="bottom" width="1%"> <p style="MARGIN: 0in 0in 0pt; TEXT-ALIGN: center" align="center"> </p></td> <td style="BORDER-RIGHT: medium none; PADDING-RIGHT: 0in; BORDER-TOP: medium none; PADDING-LEFT: 0in; PADDING-BOTTOM: 0in; BORDER-LEFT: medium none; WIDTH: 27.34%; PADDING-TOP: 0in; BORDER-BOTTOM: windowtext 1pt solid" valign="bottom" width="27%" colspan="5"> <p style="MARGIN: 0in 0in 0pt; TEXT-ALIGN: center" align="center"><b><font style="FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman" size="2">December 31, 2012</font></b></p></td> <td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; PADDING-BOTTOM: 0in; WIDTH: 3%; PADDING-TOP: 0in" valign="bottom" width="3%"> <p style="MARGIN: 0in 0in 0pt; TEXT-ALIGN: center" align="center"> </p></td> <td style="BORDER-RIGHT: medium none; PADDING-RIGHT: 0in; BORDER-TOP: medium none; PADDING-LEFT: 0in; PADDING-BOTTOM: 0in; BORDER-LEFT: medium none; WIDTH: 1.5%; PADDING-TOP: 0in; BORDER-BOTTOM: windowtext 1pt solid" valign="bottom" width="1%"> <p style="MARGIN: 0in 0in 0pt; TEXT-ALIGN: center" align="center"> </p></td> <td style="BORDER-RIGHT: medium none; PADDING-RIGHT: 0in; BORDER-TOP: medium none; PADDING-LEFT: 0in; PADDING-BOTTOM: 0in; BORDER-LEFT: medium none; WIDTH: 27.38%; PADDING-TOP: 0in; BORDER-BOTTOM: windowtext 1pt solid" valign="bottom" width="27%" colspan="5"> <p style="MARGIN: 0in 0in 0pt; TEXT-ALIGN: center" align="center"><b><font style="FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman" size="2">December 31, 2011</font></b></p></td> <td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; PADDING-BOTTOM: 0in; WIDTH: 1.08%; PADDING-TOP: 0in" valign="bottom" width="1%"> <p style="MARGIN: 0in 0in 0pt; TEXT-ALIGN: center" align="center"> </p></td></tr> <tr style="HEIGHT: 0px"> <td style="BORDER-RIGHT: medium none; PADDING-RIGHT: 0in; BORDER-TOP: medium none; PADDING-LEFT: 0in; PADDING-BOTTOM: 0in; BORDER-LEFT: medium none; WIDTH: 35.82%; PADDING-TOP: 0in; BORDER-BOTTOM: windowtext 1pt solid" valign="bottom" width="35%"> <p style="MARGIN: 0in 0in 0pt"><b><font style="FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman" size="2">Year of Maturity</font></b></p></td> <td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; PADDING-BOTTOM: 0in; WIDTH: 2.4%; PADDING-TOP: 0in" valign="bottom" width="2%"> <p style="MARGIN: 0in 0in 0pt; TEXT-ALIGN: center" align="center"> </p></td> <td style="BORDER-RIGHT: medium none; PADDING-RIGHT: 0in; BORDER-TOP: medium none; PADDING-LEFT: 0in; PADDING-BOTTOM: 0in; BORDER-LEFT: medium none; WIDTH: 1.48%; PADDING-TOP: 0in; BORDER-BOTTOM: windowtext 1pt solid" valign="bottom" width="1%"> <p style="MARGIN: 0in 0in 0pt; TEXT-ALIGN: center" align="center"> </p></td> <td style="BORDER-RIGHT: medium none; PADDING-RIGHT: 0in; BORDER-TOP: medium none; PADDING-LEFT: 0in; PADDING-BOTTOM: 0in; BORDER-LEFT: medium none; WIDTH: 13.22%; PADDING-TOP: 0in; BORDER-BOTTOM: windowtext 1pt solid" valign="bottom" width="13%" colspan="2"> <p style="MARGIN: 0in 0in 0pt; TEXT-ALIGN: center" align="center"><b><font style="FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman" size="2">Amount</font></b></p></td> <td style="BORDER-RIGHT: medium none; PADDING-RIGHT: 0in; BORDER-TOP: medium none; PADDING-LEFT: 0in; PADDING-BOTTOM: 0in; BORDER-LEFT: medium none; WIDTH: 1.5%; PADDING-TOP: 0in; BORDER-BOTTOM: windowtext 1pt solid" valign="bottom" width="1%"> <p style="MARGIN: 0in 0in 0pt; TEXT-ALIGN: center" align="center"> </p></td> <td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; PADDING-BOTTOM: 0in; WIDTH: 3%; PADDING-TOP: 0in" valign="bottom" width="3%"> <p style="MARGIN: 0in 0in 0pt; TEXT-ALIGN: center" align="center"> </p></td> <td style="BORDER-RIGHT: medium none; PADDING-RIGHT: 0in; BORDER-TOP: medium none; PADDING-LEFT: 0in; PADDING-BOTTOM: 0in; BORDER-LEFT: medium none; WIDTH: 9.62%; PADDING-TOP: 0in; BORDER-BOTTOM: windowtext 1pt solid" valign="bottom" width="9%"> <p style="MARGIN: 0in 0in 0pt; TEXT-ALIGN: center" align="center"><b><font style="FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman" size="2">Rate</font></b></p></td> <td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; PADDING-BOTTOM: 0in; WIDTH: 3%; PADDING-TOP: 0in" valign="bottom" width="3%"> <p style="MARGIN: 0in 0in 0pt; TEXT-ALIGN: center" align="center"> </p></td> <td style="BORDER-RIGHT: medium none; PADDING-RIGHT: 0in; BORDER-TOP: medium none; PADDING-LEFT: 0in; PADDING-BOTTOM: 0in; BORDER-LEFT: medium none; WIDTH: 1.5%; PADDING-TOP: 0in; BORDER-BOTTOM: windowtext 1pt solid" valign="bottom" width="1%"> <p style="MARGIN: 0in 0in 0pt; TEXT-ALIGN: center" align="center"> </p></td> <td style="BORDER-RIGHT: medium none; PADDING-RIGHT: 0in; BORDER-TOP: medium none; PADDING-LEFT: 0in; PADDING-BOTTOM: 0in; BORDER-LEFT: medium none; WIDTH: 13.22%; PADDING-TOP: 0in; BORDER-BOTTOM: windowtext 1pt solid" valign="bottom" width="13%" colspan="2"> <p style="MARGIN: 0in 0in 0pt; TEXT-ALIGN: center" align="center"><b><font style="FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman" size="2">Amount</font></b></p></td> <td style="BORDER-RIGHT: medium none; PADDING-RIGHT: 0in; BORDER-TOP: medium none; PADDING-LEFT: 0in; PADDING-BOTTOM: 0in; BORDER-LEFT: medium none; WIDTH: 1.5%; PADDING-TOP: 0in; BORDER-BOTTOM: windowtext 1pt solid" valign="bottom" width="1%"> <p style="MARGIN: 0in 0in 0pt; TEXT-ALIGN: center" align="center"> </p></td> <td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; PADDING-BOTTOM: 0in; WIDTH: 3%; PADDING-TOP: 0in" valign="bottom" width="3%"> <p style="MARGIN: 0in 0in 0pt; TEXT-ALIGN: center" align="center"> </p></td> <td style="BORDER-RIGHT: medium none; PADDING-RIGHT: 0in; BORDER-TOP: medium none; PADDING-LEFT: 0in; PADDING-BOTTOM: 0in; BORDER-LEFT: medium none; WIDTH: 9.66%; PADDING-TOP: 0in; BORDER-BOTTOM: windowtext 1pt solid" valign="bottom" width="9%"> <p style="MARGIN: 0in 0in 0pt; TEXT-ALIGN: center" align="center"><b><font style="FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman" size="2">Rate</font></b></p></td> <td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; PADDING-BOTTOM: 0in; WIDTH: 1.08%; PADDING-TOP: 0in" valign="bottom" width="1%"> <p style="MARGIN: 0in 0in 0pt; TEXT-ALIGN: center" align="center"> </p></td></tr> <tr style="HEIGHT: 0px"> <td style="BORDER-RIGHT: medium none; PADDING-RIGHT: 0in; BORDER-TOP: medium none; PADDING-LEFT: 0in; PADDING-BOTTOM: 0in; BORDER-LEFT: medium none; WIDTH: 35.82%; PADDING-TOP: 0in; BORDER-BOTTOM: medium none" valign="bottom" width="35%"> <p style="MARGIN: 0in 0in 0pt"> </p></td> <td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; PADDING-BOTTOM: 0in; WIDTH: 2.4%; PADDING-TOP: 0in" valign="bottom" width="2%"> <p style="MARGIN: 0in 0in 0pt; TEXT-ALIGN: center" align="center"> </p></td> <td style="BORDER-RIGHT: medium none; PADDING-RIGHT: 0in; BORDER-TOP: medium none; PADDING-LEFT: 0in; PADDING-BOTTOM: 0in; BORDER-LEFT: medium none; WIDTH: 1.48%; PADDING-TOP: 0in; BORDER-BOTTOM: medium none" valign="bottom" width="1%"> <p style="MARGIN: 0in 0in 0pt; TEXT-ALIGN: center" align="center"> </p></td> <td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; PADDING-BOTTOM: 0in; WIDTH: 59.22%; PADDING-TOP: 0in" valign="bottom" width="59%" colspan="12"> <p style="MARGIN: 0in 0in 0pt; TEXT-ALIGN: center" align="center"><i><font style="FONT-SIZE: 9pt; FONT-STYLE: italic; FONT-FAMILY: Times New Roman" size="1">(Dollars in thousands)</font></i></p></td> <td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; PADDING-BOTTOM: 0in; WIDTH: 1.08%; PADDING-TOP: 0in" valign="bottom" width="1%"> <p style="MARGIN: 0in 0in 0pt; TEXT-ALIGN: center" align="center"> </p></td></tr> <tr style="HEIGHT: 0px"> <td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; BACKGROUND: #cceeff; PADDING-BOTTOM: 0in; WIDTH: 35.82%; PADDING-TOP: 0in" valign="bottom" width="35%" bgcolor="#CCEEFF"> <p style="MARGIN: 0in 0in 0pt 10pt; TEXT-INDENT: -10pt"><font style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman" size="2">2012</font></p></td> <td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; BACKGROUND: #cceeff; PADDING-BOTTOM: 0in; WIDTH: 2.4%; PADDING-TOP: 0in" valign="bottom" width="2%" bgcolor="#CCEEFF"> <p style="MARGIN: 0in 0in 0pt"> </p></td> <td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; BACKGROUND: #cceeff; PADDING-BOTTOM: 0in; WIDTH: 1.48%; PADDING-TOP: 0in" valign="bottom" width="1%" bgcolor="#CCEEFF"> <p style="MARGIN: 0in 0in 0pt"> </p></td> <td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; BACKGROUND: #cceeff; PADDING-BOTTOM: 0in; WIDTH: 1.3%; PADDING-TOP: 0in" valign="bottom" width="1%" bgcolor="#CCEEFF"> <p style="MARGIN: 0in 0in 0pt"><font style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman" size="2">$</font></p></td> <td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; BACKGROUND: #cceeff; PADDING-BOTTOM: 0in; WIDTH: 11.92%; PADDING-TOP: 0in" valign="bottom" width="11%" bgcolor="#CCEEFF"> <p style="MARGIN: 0in 0in 0pt; TEXT-ALIGN: right" align="right"><font style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman" size="2">—</font></p></td> <td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; BACKGROUND: #cceeff; PADDING-BOTTOM: 0in; WIDTH: 1.5%; PADDING-TOP: 0in" valign="bottom" width="1%" bgcolor="#CCEEFF"> <p style="MARGIN: 0in 0in 0pt"> </p></td> <td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; BACKGROUND: #cceeff; PADDING-BOTTOM: 0in; WIDTH: 3%; PADDING-TOP: 0in" valign="bottom" width="3%" bgcolor="#CCEEFF"> <p style="MARGIN: 0in 0in 0pt"> </p></td> <td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; BACKGROUND: #cceeff; PADDING-BOTTOM: 0in; WIDTH: 9.62%; PADDING-TOP: 0in" valign="bottom" width="9%" bgcolor="#CCEEFF"> <p style="MARGIN: 0in 1.45pt 0pt 0in; TEXT-ALIGN: right" align="right"><font style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman" size="2">—%</font></p></td> <td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; BACKGROUND: #cceeff; PADDING-BOTTOM: 0in; WIDTH: 3%; PADDING-TOP: 0in" valign="bottom" width="3%" bgcolor="#CCEEFF"> <p style="MARGIN: 0in 0in 0pt"> </p></td> <td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; BACKGROUND: #cceeff; PADDING-BOTTOM: 0in; WIDTH: 1.5%; PADDING-TOP: 0in" valign="bottom" width="1%" bgcolor="#CCEEFF"> <p style="MARGIN: 0in 0in 0pt"> </p></td> <td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; BACKGROUND: #cceeff; PADDING-BOTTOM: 0in; WIDTH: 1.3%; PADDING-TOP: 0in" valign="bottom" width="1%" bgcolor="#CCEEFF"> <p style="MARGIN: 0in 0in 0pt"><font style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman" size="2">$</font></p></td> <td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; BACKGROUND: #cceeff; PADDING-BOTTOM: 0in; WIDTH: 11.92%; PADDING-TOP: 0in" valign="bottom" width="11%" bgcolor="#CCEEFF"> <p style="MARGIN: 0in 0in 0pt; TEXT-ALIGN: right" align="right"><font style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman" size="2">25,208</font></p></td> <td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; BACKGROUND: #cceeff; PADDING-BOTTOM: 0in; WIDTH: 1.5%; PADDING-TOP: 0in" valign="bottom" width="1%" bgcolor="#CCEEFF"> <p style="MARGIN: 0in 0in 0pt"> </p></td> <td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; BACKGROUND: #cceeff; PADDING-BOTTOM: 0in; WIDTH: 3%; PADDING-TOP: 0in" valign="bottom" width="3%" bgcolor="#CCEEFF"> <p style="MARGIN: 0in 0in 0pt"> </p></td> <td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; BACKGROUND: #cceeff; PADDING-BOTTOM: 0in; WIDTH: 9.66%; PADDING-TOP: 0in" valign="bottom" width="9%" bgcolor="#CCEEFF"> <p style="MARGIN: 0in 1.45pt 0pt 0in; TEXT-ALIGN: right" align="right"><font style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman" size="2">0.57%</font></p></td> <td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; BACKGROUND: #cceeff; PADDING-BOTTOM: 0in; WIDTH: 1.08%; PADDING-TOP: 0in" valign="bottom" width="1%" bgcolor="#CCEEFF"> <p style="MARGIN: 0in 0in 0pt"> </p></td></tr> <tr style="HEIGHT: 0px"> <td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; PADDING-BOTTOM: 0in; WIDTH: 35.82%; PADDING-TOP: 0in" valign="bottom" width="35%"> <p style="MARGIN: 0in 0in 0pt 10pt; TEXT-INDENT: -10pt"><font style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman" size="2">2015</font></p></td> <td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; PADDING-BOTTOM: 0in; WIDTH: 2.4%; PADDING-TOP: 0in" valign="bottom" width="2%"> <p style="MARGIN: 0in 0in 0pt"> </p></td> <td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; PADDING-BOTTOM: 0in; WIDTH: 1.48%; PADDING-TOP: 0in" valign="bottom" width="1%"> <p style="MARGIN: 0in 0in 0pt"> </p></td> <td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; PADDING-BOTTOM: 0in; WIDTH: 13.22%; PADDING-TOP: 0in" valign="bottom" width="13%" colspan="2"> <p style="MARGIN: 0in 0in 0pt; TEXT-ALIGN: right" align="right"><font style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman" size="2">245,000</font></p></td> <td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; PADDING-BOTTOM: 0in; WIDTH: 1.5%; PADDING-TOP: 0in" valign="bottom" width="1%"> <p style="MARGIN: 0in 0in 0pt"> </p></td> <td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; PADDING-BOTTOM: 0in; WIDTH: 3%; PADDING-TOP: 0in" valign="bottom" width="3%"> <p style="MARGIN: 0in 0in 0pt"> </p></td> <td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; PADDING-BOTTOM: 0in; WIDTH: 9.62%; PADDING-TOP: 0in" valign="bottom" width="9%"> <p style="MARGIN: 0in 1.45pt 0pt 0in; TEXT-ALIGN: right" align="right"><font style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman" size="2">4.49%</font></p></td> <td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; PADDING-BOTTOM: 0in; WIDTH: 3%; PADDING-TOP: 0in" valign="bottom" width="3%"> <p style="MARGIN: 0in 0in 0pt"> </p></td> <td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; PADDING-BOTTOM: 0in; WIDTH: 1.5%; PADDING-TOP: 0in" valign="bottom" width="1%"> <p style="MARGIN: 0in 0in 0pt"> </p></td> <td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; PADDING-BOTTOM: 0in; WIDTH: 13.22%; PADDING-TOP: 0in" valign="bottom" width="13%" colspan="2"> <p style="MARGIN: 0in 0in 0pt; TEXT-ALIGN: right" align="right"><font style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman" size="2">245,000</font></p></td> <td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; PADDING-BOTTOM: 0in; WIDTH: 1.5%; PADDING-TOP: 0in" valign="bottom" width="1%"> <p style="MARGIN: 0in 0in 0pt"> </p></td> <td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; PADDING-BOTTOM: 0in; WIDTH: 3%; PADDING-TOP: 0in" valign="bottom" width="3%"> <p style="MARGIN: 0in 0in 0pt"> </p></td> <td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; PADDING-BOTTOM: 0in; WIDTH: 9.66%; PADDING-TOP: 0in" valign="bottom" width="9%"> <p style="MARGIN: 0in 1.45pt 0pt 0in; TEXT-ALIGN: right" align="right"><font style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman" size="2">4.49%</font></p></td> <td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; PADDING-BOTTOM: 0in; WIDTH: 1.08%; PADDING-TOP: 0in" valign="bottom" width="1%"> <p style="MARGIN: 0in 0in 0pt"> </p></td></tr> <tr style="HEIGHT: 0px"> <td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; BACKGROUND: #cceeff; PADDING-BOTTOM: 0in; WIDTH: 35.82%; PADDING-TOP: 0in" valign="bottom" width="35%" bgcolor="#CCEEFF"> <p style="MARGIN: 0in 0in 0pt 10pt; TEXT-INDENT: -10pt"><font style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman" size="2">2016</font></p></td> <td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; BACKGROUND: #cceeff; PADDING-BOTTOM: 0in; WIDTH: 2.4%; PADDING-TOP: 0in" valign="bottom" width="2%" bgcolor="#CCEEFF"> <p style="MARGIN: 0in 0in 0pt"> </p></td> <td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; BACKGROUND: #cceeff; PADDING-BOTTOM: 0in; WIDTH: 1.48%; PADDING-TOP: 0in" valign="bottom" width="1%" bgcolor="#CCEEFF"> <p style="MARGIN: 0in 0in 0pt"> </p></td> <td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; BACKGROUND: #cceeff; PADDING-BOTTOM: 0in; WIDTH: 13.22%; PADDING-TOP: 0in" valign="bottom" width="13%" bgcolor="#CCEEFF" colspan="2"> <p style="MARGIN: 0in 0in 0pt; TEXT-ALIGN: right" align="right"><font style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman" size="2">350,000</font></p></td> <td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; BACKGROUND: #cceeff; PADDING-BOTTOM: 0in; WIDTH: 1.5%; PADDING-TOP: 0in" valign="bottom" width="1%" bgcolor="#CCEEFF"> <p style="MARGIN: 0in 0in 0pt"> </p></td> <td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; BACKGROUND: #cceeff; PADDING-BOTTOM: 0in; WIDTH: 3%; PADDING-TOP: 0in" valign="bottom" width="3%" bgcolor="#CCEEFF"> <p style="MARGIN: 0in 0in 0pt"> </p></td> <td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; BACKGROUND: #cceeff; PADDING-BOTTOM: 0in; WIDTH: 9.62%; PADDING-TOP: 0in" valign="bottom" width="9%" bgcolor="#CCEEFF"> <p style="MARGIN: 0in 1.45pt 0pt 0in; TEXT-ALIGN: right" align="right"><font style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman" size="2">4.96%</font></p></td> <td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; BACKGROUND: #cceeff; PADDING-BOTTOM: 0in; WIDTH: 3%; PADDING-TOP: 0in" valign="bottom" width="3%" bgcolor="#CCEEFF"> <p style="MARGIN: 0in 0in 0pt"> </p></td> <td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; BACKGROUND: #cceeff; PADDING-BOTTOM: 0in; WIDTH: 1.5%; PADDING-TOP: 0in" valign="bottom" width="1%" bgcolor="#CCEEFF"> <p style="MARGIN: 0in 0in 0pt"> </p></td> <td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; BACKGROUND: #cceeff; PADDING-BOTTOM: 0in; WIDTH: 13.22%; PADDING-TOP: 0in" valign="bottom" width="13%" bgcolor="#CCEEFF" colspan="2"> <p style="MARGIN: 0in 0in 0pt; TEXT-ALIGN: right" align="right"><font style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman" size="2">700,000</font></p></td> <td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; BACKGROUND: #cceeff; PADDING-BOTTOM: 0in; WIDTH: 1.5%; PADDING-TOP: 0in" valign="bottom" width="1%" bgcolor="#CCEEFF"> <p style="MARGIN: 0in 0in 0pt"> </p></td> <td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; BACKGROUND: #cceeff; PADDING-BOTTOM: 0in; WIDTH: 3%; PADDING-TOP: 0in" valign="bottom" width="3%" bgcolor="#CCEEFF"> <p style="MARGIN: 0in 0in 0pt"> </p></td> <td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; BACKGROUND: #cceeff; PADDING-BOTTOM: 0in; WIDTH: 9.66%; PADDING-TOP: 0in" valign="bottom" width="9%" bgcolor="#CCEEFF"> <p style="MARGIN: 0in 1.45pt 0pt 0in; TEXT-ALIGN: right" align="right"><font style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman" size="2">4.91%</font></p></td> <td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; BACKGROUND: #cceeff; PADDING-BOTTOM: 0in; WIDTH: 1.08%; PADDING-TOP: 0in" valign="bottom" width="1%" bgcolor="#CCEEFF"> <p style="MARGIN: 0in 0in 0pt"> </p></td></tr> <tr style="HEIGHT: 0px"> <td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; PADDING-BOTTOM: 0in; WIDTH: 35.82%; PADDING-TOP: 0in" valign="bottom" width="35%"> <p style="MARGIN: 0in 0in 0pt 10pt; TEXT-INDENT: -10pt"><font style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman" size="2">2017</font></p></td> <td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; PADDING-BOTTOM: 0in; WIDTH: 2.4%; PADDING-TOP: 0in" valign="bottom" width="2%"> <p style="MARGIN: 0in 0in 0pt"> </p></td> <td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; PADDING-BOTTOM: 0in; WIDTH: 1.48%; PADDING-TOP: 0in" valign="bottom" width="1%"> <p style="MARGIN: 0in 0in 0pt"> </p></td> <td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; PADDING-BOTTOM: 0in; WIDTH: 13.22%; PADDING-TOP: 0in" valign="bottom" width="13%" colspan="2"> <p style="MARGIN: 0in 0in 0pt; TEXT-ALIGN: right" align="right"><font style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman" size="2">50,000</font></p></td> <td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; PADDING-BOTTOM: 0in; WIDTH: 1.5%; PADDING-TOP: 0in" valign="bottom" width="1%"> <p style="MARGIN: 0in 0in 0pt"> </p></td> <td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; PADDING-BOTTOM: 0in; WIDTH: 3%; PADDING-TOP: 0in" valign="bottom" width="3%"> <p style="MARGIN: 0in 0in 0pt"> </p></td> <td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; PADDING-BOTTOM: 0in; WIDTH: 9.62%; PADDING-TOP: 0in" valign="bottom" width="9%"> <p style="MARGIN: 0in 1.45pt 0pt 0in; TEXT-ALIGN: right" align="right"><font style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman" size="2">4.15%</font></p></td> <td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; PADDING-BOTTOM: 0in; WIDTH: 3%; PADDING-TOP: 0in" valign="bottom" width="3%"> <p style="MARGIN: 0in 0in 0pt"> </p></td> <td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; PADDING-BOTTOM: 0in; WIDTH: 1.5%; PADDING-TOP: 0in" valign="bottom" width="1%"> <p style="MARGIN: 0in 0in 0pt"> </p></td> <td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; PADDING-BOTTOM: 0in; WIDTH: 13.22%; PADDING-TOP: 0in" valign="bottom" width="13%" colspan="2"> <p style="MARGIN: 0in 0in 0pt; TEXT-ALIGN: right" align="right"><font style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman" size="2">50,000</font></p></td> <td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; PADDING-BOTTOM: 0in; WIDTH: 1.5%; PADDING-TOP: 0in" valign="bottom" width="1%"> <p style="MARGIN: 0in 0in 0pt"> </p></td> <td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; PADDING-BOTTOM: 0in; WIDTH: 3%; PADDING-TOP: 0in" valign="bottom" width="3%"> <p style="MARGIN: 0in 0in 0pt"> </p></td> <td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; PADDING-BOTTOM: 0in; WIDTH: 9.66%; PADDING-TOP: 0in" valign="bottom" width="9%"> <p style="MARGIN: 0in 1.45pt 0pt 0in; TEXT-ALIGN: right" align="right"><font style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman" size="2">4.15%</font></p></td> <td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; PADDING-BOTTOM: 0in; WIDTH: 1.08%; PADDING-TOP: 0in" valign="bottom" width="1%"> <p style="MARGIN: 0in 0in 0pt"> </p></td></tr> <tr style="HEIGHT: 0px"> <td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; BACKGROUND: #cceeff; PADDING-BOTTOM: 0in; WIDTH: 35.82%; PADDING-TOP: 0in" valign="bottom" width="35%" bgcolor="#CCEEFF"> <p style="MARGIN: 0in 0in 0pt 10pt; TEXT-INDENT: -10pt"><font style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman" size="2">2022</font></p></td> <td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; BACKGROUND: #cceeff; PADDING-BOTTOM: 0in; WIDTH: 2.4%; PADDING-TOP: 0in" valign="bottom" width="2%" bgcolor="#CCEEFF"> <p style="MARGIN: 0in 0in 0pt"> </p></td> <td style="BORDER-RIGHT: medium none; PADDING-RIGHT: 0in; BORDER-TOP: medium none; PADDING-LEFT: 0in; BACKGROUND: #cceeff; PADDING-BOTTOM: 0in; BORDER-LEFT: medium none; WIDTH: 1.48%; PADDING-TOP: 0in; BORDER-BOTTOM: windowtext 1pt solid" valign="bottom" width="1%" bgcolor="#CCEEFF"> <p style="MARGIN: 0in 0in 0pt"> </p></td> <td style="BORDER-RIGHT: medium none; PADDING-RIGHT: 0in; BORDER-TOP: medium none; PADDING-LEFT: 0in; BACKGROUND: #cceeff; PADDING-BOTTOM: 0in; BORDER-LEFT: medium none; WIDTH: 13.22%; PADDING-TOP: 0in; BORDER-BOTTOM: windowtext 1pt solid" valign="bottom" width="13%" bgcolor="#CCEEFF" colspan="2"> <p style="MARGIN: 0in 0in 0pt; TEXT-ALIGN: right" align="right"><font style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman" size="2">350,000</font></p></td> <td style="BORDER-RIGHT: medium none; PADDING-RIGHT: 0in; BORDER-TOP: medium none; PADDING-LEFT: 0in; BACKGROUND: #cceeff; PADDING-BOTTOM: 0in; BORDER-LEFT: medium none; WIDTH: 1.5%; PADDING-TOP: 0in; BORDER-BOTTOM: windowtext 1pt solid" valign="bottom" width="1%" bgcolor="#CCEEFF"> <p style="MARGIN: 0in 0in 0pt"> </p></td> <td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; BACKGROUND: #cceeff; PADDING-BOTTOM: 0in; WIDTH: 3%; PADDING-TOP: 0in" valign="bottom" width="3%" bgcolor="#CCEEFF"> <p style="MARGIN: 0in 0in 0pt"> </p></td> <td style="BORDER-RIGHT: medium none; PADDING-RIGHT: 0in; BORDER-TOP: medium none; PADDING-LEFT: 0in; BACKGROUND: #cceeff; PADDING-BOTTOM: 0in; BORDER-LEFT: medium none; WIDTH: 9.62%; PADDING-TOP: 0in; BORDER-BOTTOM: windowtext 1pt solid" valign="bottom" width="9%" bgcolor="#CCEEFF"> <p style="MARGIN: 0in 1.45pt 0pt 0in; TEXT-ALIGN: right" align="right"><font style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman" size="2">3.53%</font></p></td> <td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; BACKGROUND: #cceeff; PADDING-BOTTOM: 0in; WIDTH: 3%; PADDING-TOP: 0in" valign="bottom" width="3%" bgcolor="#CCEEFF"> <p style="MARGIN: 0in 0in 0pt"> </p></td> <td style="BORDER-RIGHT: medium none; PADDING-RIGHT: 0in; BORDER-TOP: medium none; PADDING-LEFT: 0in; BACKGROUND: #cceeff; PADDING-BOTTOM: 0in; BORDER-LEFT: medium none; WIDTH: 1.5%; PADDING-TOP: 0in; BORDER-BOTTOM: windowtext 1pt solid" valign="bottom" width="1%" bgcolor="#CCEEFF"> <p style="MARGIN: 0in 0in 0pt"> </p></td> <td style="BORDER-RIGHT: medium none; PADDING-RIGHT: 0in; BORDER-TOP: medium none; PADDING-LEFT: 0in; BACKGROUND: #cceeff; PADDING-BOTTOM: 0in; BORDER-LEFT: medium none; WIDTH: 13.22%; PADDING-TOP: 0in; BORDER-BOTTOM: windowtext 1pt solid" valign="bottom" width="13%" bgcolor="#CCEEFF" colspan="2"> <p style="MARGIN: 0in 0in 0pt; TEXT-ALIGN: right" align="right"><font style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman" size="2">—</font></p></td> <td style="BORDER-RIGHT: medium none; PADDING-RIGHT: 0in; BORDER-TOP: medium none; PADDING-LEFT: 0in; BACKGROUND: #cceeff; PADDING-BOTTOM: 0in; BORDER-LEFT: medium none; WIDTH: 1.5%; PADDING-TOP: 0in; BORDER-BOTTOM: windowtext 1pt solid" valign="bottom" width="1%" bgcolor="#CCEEFF"> <p style="MARGIN: 0in 0in 0pt"> </p></td> <td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; BACKGROUND: #cceeff; PADDING-BOTTOM: 0in; WIDTH: 3%; PADDING-TOP: 0in" valign="bottom" width="3%" bgcolor="#CCEEFF"> <p style="MARGIN: 0in 0in 0pt"> </p></td> <td style="BORDER-RIGHT: medium none; PADDING-RIGHT: 0in; BORDER-TOP: medium none; PADDING-LEFT: 0in; BACKGROUND: #cceeff; PADDING-BOTTOM: 0in; BORDER-LEFT: medium none; WIDTH: 9.66%; PADDING-TOP: 0in; BORDER-BOTTOM: windowtext 1pt solid" valign="bottom" width="9%" bgcolor="#CCEEFF"> <p style="MARGIN: 0in 1.45pt 0pt 0in; TEXT-ALIGN: right" align="right"><font style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman" size="2">—%</font></p></td> <td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; BACKGROUND: #cceeff; PADDING-BOTTOM: 0in; WIDTH: 1.08%; PADDING-TOP: 0in" valign="bottom" width="1%" bgcolor="#CCEEFF"> <p style="MARGIN: 0in 0in 0pt"> </p></td></tr> <tr style="HEIGHT: 0px"> <td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; PADDING-BOTTOM: 0in; WIDTH: 35.82%; PADDING-TOP: 0in" valign="bottom" width="35%"> <p style="MARGIN: 0in 0in 0pt 50pt; TEXT-INDENT: -10pt"><font style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman" size="2">Total</font></p></td> <td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; PADDING-BOTTOM: 0in; WIDTH: 2.4%; PADDING-TOP: 0in" valign="bottom" width="2%"> <p style="MARGIN: 0in 0in 0pt"> </p></td> <td style="BORDER-RIGHT: medium none; PADDING-RIGHT: 0in; BORDER-TOP: medium none; PADDING-LEFT: 0in; PADDING-BOTTOM: 0in; BORDER-LEFT: medium none; WIDTH: 1.48%; PADDING-TOP: 0in; BORDER-BOTTOM: windowtext 2.25pt double" valign="bottom" width="1%"> <p style="MARGIN: 0in 0in 0pt"> </p></td> <td style="BORDER-RIGHT: medium none; PADDING-RIGHT: 0in; BORDER-TOP: medium none; PADDING-LEFT: 0in; PADDING-BOTTOM: 0in; BORDER-LEFT: medium none; WIDTH: 1.3%; PADDING-TOP: 0in; BORDER-BOTTOM: windowtext 2.25pt double" valign="bottom" width="1%"> <p style="MARGIN: 0in 0in 0pt"><font style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman" size="2">$</font></p></td> <td style="BORDER-RIGHT: medium none; PADDING-RIGHT: 0in; BORDER-TOP: medium none; PADDING-LEFT: 0in; PADDING-BOTTOM: 0in; BORDER-LEFT: medium none; WIDTH: 11.92%; PADDING-TOP: 0in; BORDER-BOTTOM: windowtext 2.25pt double" valign="bottom" width="11%"> <p style="MARGIN: 0in 0in 0pt; TEXT-ALIGN: right" align="right"><font style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman" size="2">995,000</font></p></td> <td style="BORDER-RIGHT: medium none; PADDING-RIGHT: 0in; BORDER-TOP: medium none; PADDING-LEFT: 0in; PADDING-BOTTOM: 0in; BORDER-LEFT: medium none; WIDTH: 1.5%; PADDING-TOP: 0in; BORDER-BOTTOM: windowtext 2.25pt double" valign="bottom" width="1%"> <p style="MARGIN: 0in 0in 0pt"> </p></td> <td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; PADDING-BOTTOM: 0in; WIDTH: 3%; PADDING-TOP: 0in" valign="bottom" width="3%"> <p style="MARGIN: 0in 0in 0pt"> </p></td> <td style="BORDER-RIGHT: medium none; PADDING-RIGHT: 0in; BORDER-TOP: medium none; PADDING-LEFT: 0in; PADDING-BOTTOM: 0in; BORDER-LEFT: medium none; WIDTH: 9.62%; PADDING-TOP: 0in; BORDER-BOTTOM: windowtext 2.25pt double" valign="bottom" width="9%"> <p style="MARGIN: 0in 1.45pt 0pt 0in; TEXT-ALIGN: right" align="right"><font style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman" size="2">4.30%</font></p></td> <td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; PADDING-BOTTOM: 0in; WIDTH: 3%; PADDING-TOP: 0in" valign="bottom" width="3%"> <p style="MARGIN: 0in 0in 0pt"> </p></td> <td style="BORDER-RIGHT: medium none; PADDING-RIGHT: 0in; BORDER-TOP: medium none; PADDING-LEFT: 0in; PADDING-BOTTOM: 0in; BORDER-LEFT: medium none; WIDTH: 1.5%; PADDING-TOP: 0in; BORDER-BOTTOM: windowtext 2.25pt double" valign="bottom" width="1%"> <p style="MARGIN: 0in 0in 0pt"> </p></td> <td style="BORDER-RIGHT: medium none; PADDING-RIGHT: 0in; BORDER-TOP: medium none; PADDING-LEFT: 0in; PADDING-BOTTOM: 0in; BORDER-LEFT: medium none; WIDTH: 1.3%; PADDING-TOP: 0in; BORDER-BOTTOM: windowtext 2.25pt double" valign="bottom" width="1%"> <p style="MARGIN: 0in 0in 0pt"><font style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman" size="2">$</font></p></td> <td style="BORDER-RIGHT: medium none; PADDING-RIGHT: 0in; BORDER-TOP: medium none; PADDING-LEFT: 0in; PADDING-BOTTOM: 0in; BORDER-LEFT: medium none; WIDTH: 11.92%; PADDING-TOP: 0in; BORDER-BOTTOM: windowtext 2.25pt double" valign="bottom" width="11%"> <p style="MARGIN: 0in 0in 0pt; TEXT-ALIGN: right" align="right"><font style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman" size="2">1,020,208</font></p></td> <td style="BORDER-RIGHT: medium none; PADDING-RIGHT: 0in; BORDER-TOP: medium none; PADDING-LEFT: 0in; PADDING-BOTTOM: 0in; BORDER-LEFT: medium none; WIDTH: 1.5%; PADDING-TOP: 0in; BORDER-BOTTOM: windowtext 2.25pt double" valign="bottom" width="1%"> <p style="MARGIN: 0in 0in 0pt"> </p></td> <td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; PADDING-BOTTOM: 0in; WIDTH: 3%; PADDING-TOP: 0in" valign="bottom" width="3%"> <p style="MARGIN: 0in 0in 0pt"> </p></td> <td style="BORDER-RIGHT: medium none; PADDING-RIGHT: 0in; BORDER-TOP: medium none; PADDING-LEFT: 0in; PADDING-BOTTOM: 0in; BORDER-LEFT: medium none; WIDTH: 9.66%; PADDING-TOP: 0in; BORDER-BOTTOM: windowtext 2.25pt double" valign="bottom" width="9%"> <p style="MARGIN: 0in 1.45pt 0pt 0in; TEXT-ALIGN: right" align="right"><font style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman" size="2">4.66%</font></p></td> <td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; PADDING-BOTTOM: 0in; WIDTH: 1.08%; PADDING-TOP: 0in" valign="bottom" width="1%"> <p style="MARGIN: 0in 0in 0pt"> </p></td></tr></table></div>
CY2012Q2	ewbc	Reversal Of Provision For Loan And Lease Losses ReversalOfProvisionForLoanAndLeaseLosses	-1095000	USD
CY2012	us-gaap	Investment Tax Credit InvestmentTaxCredit	18700000	USD
CY2012	ewbc	Number Of Statutory Business Trusts Formed For Issuing Debt To Third Party Investors NumberOfStatutoryBusinessTrustsFormedForIssuingDebtToThirdPartyInvestors	7	item
CY2011Q4	us-gaap	Common Stock Held In Trust CommonStockHeldInTrust	4200000	USD
CY2012Q4	us-gaap	Common Stock Held In Trust CommonStockHeldInTrust	4200000	USD
CY2009Q4	ewbc	Minimum Total Consolidated Assets For Exclusion Of Trust Preferred Securities As Tier I Regulatory Capital MinimumTotalConsolidatedAssetsForExclusionOfTrustPreferredSecuritiesAsTierIRegulatoryCapital	15000000000	USD
CY2011Q4	ewbc	Reversal Of Provision For Loan And Lease Losses ReversalOfProvisionForLoanAndLeaseLosses	213000	USD
CY2012Q4	us-gaap	Junior Subordinated Debenture Owed To Unconsolidated Subsidiary Trust JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrust	133000000	USD
CY2011Q4	us-gaap	Junior Subordinated Debenture Owed To Unconsolidated Subsidiary Trust JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrust	133000000	USD
CY2012	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	148572000	USD
CY2011	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	-86157000	USD
CY2010	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	9942000	USD
CY2011	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	34760000	USD
CY2010	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	69026000	USD
CY2012	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	2316000	USD
CY2012	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	5704000	USD
CY2012	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	156592000	USD
CY2011	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	-51397000	USD
CY2010	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	78968000	USD
CY2012	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-38749000	USD
CY2011	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	193834000	USD
CY2010	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	55083000	USD
CY2011	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-7706000	USD
CY2010	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-48273000	USD
CY2012	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	26099000	USD
CY2011	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	3369000	USD
CY2010	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	5567000	USD
CY2012	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-12650000	USD
CY2012	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	143942000	USD
CY2012	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.350	pure
CY2011	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.350	pure
CY2010	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.350	pure
CY2012	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.043	pure
CY2011	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.043	pure
CY2010	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.053	pure
CY2012	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits EffectiveIncomeTaxRateReconciliationTaxCredits	-0.053	pure
CY2011	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits EffectiveIncomeTaxRateReconciliationTaxCredits	-0.027	pure
CY2010	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits EffectiveIncomeTaxRateReconciliationTaxCredits	-0.048	pure
CY2012	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	-0.002	pure
CY2011	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	-0.006	pure
CY2010	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	0.002	pure
CY2012	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.338	pure
CY2011	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.360	pure
CY2010	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.357	pure
CY2011Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets	24853000	USD
CY2011Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	27945000	USD
CY2011Q4	ewbc	Deferred Tax Liabilities Federal Home Loan Bank Stock DeferredTaxLiabilitiesFederalHomeLoanBankStock	30962000	USD
CY2011Q4	us-gaap	Deferred Tax Liabilities Tax Deferred Income DeferredTaxLiabilitiesTaxDeferredIncome	3885000	USD
CY2011Q4	ewbc	Deferred Tax Liabilities Purchased Loan Discounts DeferredTaxLiabilitiesPurchasedLoanDiscounts	204000	USD
CY2011Q4	ewbc	Deferred Tax Liabilities State Taxes DeferredTaxLiabilitiesStateTaxes	10749000	USD
CY2011Q4	us-gaap	Deferred Tax Liabilities Mortgage Servicing Rights DeferredTaxLiabilitiesMortgageServicingRights	3271000	USD
CY2011Q4	ewbc	Deferred Tax Liabilities Section597 Gain DeferredTaxLiabilitiesSection597Gain	146522000	USD
CY2011Q4	ewbc	Deferred Tax Liabilities Fdic Receivable DeferredTaxLiabilitiesFDICReceivable	380363000	USD
CY2011Q4	us-gaap	Deferred Tax Liabilities Financing Arrangements DeferredTaxLiabilitiesFinancingArrangements	12124000	USD
CY2011Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	5141000	USD
CY2011Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	665014000	USD
CY2012Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets	20257000	USD
CY2012Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	21490000	USD
CY2012Q4	ewbc	Deferred Tax Liabilities Federal Home Loan Bank Stock DeferredTaxLiabilitiesFederalHomeLoanBankStock	26810000	USD
CY2012Q4	us-gaap	Deferred Tax Liabilities Tax Deferred Income DeferredTaxLiabilitiesTaxDeferredIncome	3242000	USD
CY2012Q4	ewbc	Deferred Tax Liabilities Purchased Loan Discounts DeferredTaxLiabilitiesPurchasedLoanDiscounts	162000	USD
CY2012Q4	ewbc	Deferred Tax Liabilities State Taxes DeferredTaxLiabilitiesStateTaxes	7894000	USD
CY2012Q4	us-gaap	Deferred Tax Liabilities Mortgage Servicing Rights DeferredTaxLiabilitiesMortgageServicingRights	2329000	USD
CY2012Q4	ewbc	Deferred Tax Liabilities Section597 Gain DeferredTaxLiabilitiesSection597Gain	96915000	USD
CY2012Q4	ewbc	Deferred Tax Liabilities Fdic Receivable DeferredTaxLiabilitiesFDICReceivable	328146000	USD
CY2012Q4	us-gaap	Deferred Tax Liabilities Financing Arrangements DeferredTaxLiabilitiesFinancingArrangements	12173000	USD
CY2012Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	-23000	USD
CY2012Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	539953000	USD
CY2012Q4	ewbc	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Provision For Loan Losses And Reo Reserves DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLossesAndREOReserves	111985000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits	23475000	USD
CY2012Q4	ewbc	Deferred Tax Assets Purchased Loan Premium DeferredTaxAssetsPurchasedLoanPremium	624000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Unrealized Losses On Availablefor Sale Securities Gross DeferredTaxAssetsUnrealizedLossesOnAvailableforSaleSecuritiesGross	60383000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	698000	USD
CY2012Q4	ewbc	Deferred Tax Assets Acquired Loans And Re Os DeferredTaxAssetsAcquiredLoansAndREOs	516578000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	12295000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	726038000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	372000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	185713000	USD
CY2011Q4	ewbc	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Provision For Loan Losses And Reo Reserves DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLossesAndREOReserves	92605000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits	18634000	USD
CY2011Q4	ewbc	Deferred Tax Assets Purchased Loan Premium DeferredTaxAssetsPurchasedLoanPremium	1063000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Unrealized Losses On Availablefor Sale Securities Gross DeferredTaxAssetsUnrealizedLossesOnAvailableforSaleSecuritiesGross	89506000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	35447000	USD
CY2011Q4	ewbc	Deferred Tax Assets Acquired Loans And Re Os DeferredTaxAssetsAcquiredLoansAndREOs	615855000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	14390000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	867500000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	603000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	201883000	USD
CY2011Q3	ewbc	Reversal Of Provision For Loan And Lease Losses ReversalOfProvisionForLoanAndLeaseLosses	-297000	USD
CY2010Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	4952000	USD
CY2011Q4	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	287000	USD
CY2010Q4	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	796000	USD
CY2012Q4	us-gaap	Income Tax Examination Penalties And Interest Accrued IncomeTaxExaminationPenaltiesAndInterestAccrued	2700000	USD
CY2011Q4	us-gaap	Income Tax Examination Penalties And Interest Accrued IncomeTaxExaminationPenaltiesAndInterestAccrued	1500000	USD
CY2012	us-gaap	Sharebased Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Outstanding Options Weighted Average Remaining Contractual Term2 SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageRemainingContractualTerm2	P1Y5M26D
CY2012Q4	us-gaap	Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Number Of Exercisable Options ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions	663206	shares
CY2011	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	794000	USD
CY2011	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	3208000	USD
CY2011	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	794000	USD
CY2011Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	3332000	USD
CY2012Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	3457000	USD
CY2012	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	1060000	USD
CY2012	ewbc	Unrecognized Tax Benefits Increases Or Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsIncreasesOrDecreasesResultingFromSettlementsWithTaxingAuthorities	-935000	USD
CY2012	ewbc	Increase In Unrecognized Tax Benefits Reserve For Enterprise Zone Net Interest Deduction IncreaseInUnrecognizedTaxBenefitsReserveForEnterpriseZoneNetInterestDeduction	1100000	USD
CY2011	ewbc	Decrease In Unrecognized Tax Benefits Reserve For Enterprise Zone Net Interest Deduction DecreaseInUnrecognizedTaxBenefitsReserveForEnterpriseZoneNetInterestDeduction	3200000	USD
CY2012Q4	ewbc	Accounting For Uncertainty In Income Taxes Asc74010 Liability AccountingForUncertaintyInIncomeTaxesASC74010Liability	6100000	USD
CY2011Q4	ewbc	Accounting For Uncertainty In Income Taxes Asc74010 Liability AccountingForUncertaintyInIncomeTaxesASC74010Liability	4800000	USD
CY2012Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	2200000	USD
CY2011Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	2200000	USD
CY2012Q4	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	1200000	USD
CY2012Q4	ewbc	Allowance For Unfunded Loan Commitments And Off Balance Sheet Credit Exposures And Recourse Provision AllowanceForUnfundedLoanCommitmentsAndOffBalanceSheetCreditExposuresAndRecourseProvision	9400000	USD
CY2011Q4	ewbc	Allowance For Unfunded Loan Commitments And Off Balance Sheet Credit Exposures And Recourse Provision AllowanceForUnfundedLoanCommitmentsAndOffBalanceSheetCreditExposuresAndRecourseProvision	11000000	USD
CY2012	us-gaap	Operating Leases Rent Expense Net OperatingLeasesRentExpenseNet	25800000	USD
CY2011	us-gaap	Operating Leases Rent Expense Net OperatingLeasesRentExpenseNet	22800000	USD
CY2010	us-gaap	Operating Leases Rent Expense Net OperatingLeasesRentExpenseNet	23200000	USD
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Due Current OperatingLeasesFutureMinimumPaymentsDueCurrent	26437000	USD
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Due In Two Years OperatingLeasesFutureMinimumPaymentsDueInTwoYears	24105000	USD
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Due In Three Years OperatingLeasesFutureMinimumPaymentsDueInThreeYears	20027000	USD
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Due In Four Years OperatingLeasesFutureMinimumPaymentsDueInFourYears	15555000	USD
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Due In Five Years OperatingLeasesFutureMinimumPaymentsDueInFiveYears	12052000	USD
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Due Thereafter OperatingLeasesFutureMinimumPaymentsDueThereafter	31309000	USD
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Due OperatingLeasesFutureMinimumPaymentsDue	129485000	USD
CY2012Q4	us-gaap	Sharebased Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Exercisable Options Weighted Average Exercise Price1 SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1	28.88
CY2012Q4	us-gaap	Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Number Of Outstanding Options ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions	677708	shares
CY2012Q4	us-gaap	Sharebased Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Outstanding Options Weighted Average Exercise Price Beginning Balance1 SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1	28.41
CY2010	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	8500000	USD
CY2011	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	13500000	USD
CY2012	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	12700000	USD
CY2012	us-gaap	Allocated Share Based Compensation Expense Net Of Tax AllocatedShareBasedCompensationExpenseNetOfTax	7300000	USD
CY2010	us-gaap	Allocated Share Based Compensation Expense Net Of Tax AllocatedShareBasedCompensationExpenseNetOfTax	4900000	USD
CY2011	us-gaap	Allocated Share Based Compensation Expense Net Of Tax AllocatedShareBasedCompensationExpenseNetOfTax	7900000	USD
CY2012Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Grant ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant	4436370	shares
CY2012	us-gaap	Defined Benefit Plan Contributions By Employer DefinedBenefitPlanContributionsByEmployer	3500000	USD
CY2011	us-gaap	Defined Benefit Plan Contributions By Employer DefinedBenefitPlanContributionsByEmployer	3000000	USD
CY2010	us-gaap	Defined Benefit Plan Contributions By Employer DefinedBenefitPlanContributionsByEmployer	2000000	USD
CY2012	us-gaap	Treasury Stock Acquired Average Cost Per Share TreasuryStockAcquiredAverageCostPerShare	22.02
CY2012Q4	ewbc	Cost Of Repurchase Of Treasury Shares CostOfRepurchaseOfTreasuryShares	199900000	USD
CY2011Q4	us-gaap	Capital Capital	2296274000	USD
CY2011Q4	us-gaap	Tier One Risk Based Capital TierOneRiskBasedCapital	2074963000	USD
CY2011Q4	us-gaap	Tier One Leverage Capital TierOneLeverageCapital	2074963000	USD
CY2011Q4	us-gaap	Capital To Risk Weighted Assets CapitalToRiskWeightedAssets	0.164	pure
CY2011Q4	us-gaap	Tier One Risk Based Capital To Risk Weighted Assets TierOneRiskBasedCapitalToRiskWeightedAssets	0.148	pure
CY2011Q4	us-gaap	Tier One Leverage Capital To Average Assets TierOneLeverageCapitalToAverageAssets	0.097	pure
CY2011Q4	us-gaap	Capital Required For Capital Adequacy CapitalRequiredForCapitalAdequacy	1123413000	USD
CY2011Q4	us-gaap	Tier One Risk Based Capital Required For Capital Adequacy TierOneRiskBasedCapitalRequiredForCapitalAdequacy	561706000	USD
CY2011Q4	us-gaap	Tier One Leverage Capital Required For Capital Adequacy TierOneLeverageCapitalRequiredForCapitalAdequacy	859098000	USD
CY2011Q4	us-gaap	Capital Required For Capital Adequacy To Risk Weighted Assets CapitalRequiredForCapitalAdequacyToRiskWeightedAssets	0.080	pure
CY2011Q4	us-gaap	Tier One Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets	0.040	pure
CY2011Q4	us-gaap	Tier One Leverage Capital Required For Capital Adequacy To Average Assets TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets	0.040	pure
CY2011	ewbc	Trust Preferred Securities As Percentage Of Tier I Capital TrustPreferredSecuritiesAsPercentageOfTierICapital	0.064	pure
CY2012Q4	us-gaap	Capital Capital	2296253000	USD
CY2012Q4	us-gaap	Tier One Risk Based Capital TierOneRiskBasedCapital	2116757000	USD
CY2012Q4	us-gaap	Tier One Leverage Capital TierOneLeverageCapital	2116757000	USD
CY2012Q4	us-gaap	Capital To Risk Weighted Assets CapitalToRiskWeightedAssets	0.161	pure
CY2012Q4	us-gaap	Tier One Risk Based Capital To Risk Weighted Assets TierOneRiskBasedCapitalToRiskWeightedAssets	0.148	pure
CY2012Q4	us-gaap	Tier One Leverage Capital To Average Assets TierOneLeverageCapitalToAverageAssets	0.096	pure
CY2012Q4	us-gaap	Capital Required For Capital Adequacy CapitalRequiredForCapitalAdequacy	1142743000	USD
CY2012Q4	us-gaap	Tier One Risk Based Capital Required For Capital Adequacy TierOneRiskBasedCapitalRequiredForCapitalAdequacy	571371000	USD
CY2011Q4	us-gaap	Time Deposits TimeDeposits	7146001000	USD
CY2011Q4	us-gaap	Time Deposits100000 Or More Foreign TimeDeposits100000OrMoreForeign	264600000	USD
CY2012Q4	us-gaap	Noninterest Bearing Deposit Liabilities NoninterestBearingDepositLiabilities	4535877000	USD
CY2012Q4	us-gaap	Tier One Leverage Capital Required For Capital Adequacy TierOneLeverageCapitalRequiredForCapitalAdequacy	880526000	USD
CY2012Q4	us-gaap	Capital Required For Capital Adequacy To Risk Weighted Assets CapitalRequiredForCapitalAdequacyToRiskWeightedAssets	0.080	pure
CY2012Q4	us-gaap	Tier One Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets	0.040	pure
CY2012Q4	us-gaap	Tier One Leverage Capital Required For Capital Adequacy To Average Assets TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets	0.040	pure
CY2012Q4	ewbc	Minimum Total Consolidated Assets For Exclusion Of Trust Preferred Securities As Tier I Regulatory Capital MinimumTotalConsolidatedAssetsForExclusionOfTrustPreferredSecuritiesAsTierIRegulatoryCapital	15000000000	USD
CY2012	ewbc	Trust Preferred Securities As Percentage Of Tier I Capital TrustPreferredSecuritiesAsPercentageOfTierICapital	0.063	pure
CY2012	us-gaap	Number Of Operating Segments NumberOfOperatingSegments	3	item
CY2012Q4	ewbc	Number Of Segment Whom Broad Administrative Support Provided NumberOfSegmentWhomBroadAdministrativeSupportProvided	2	item
CY2011	ewbc	Charge For Funds Used ChargeForFundsUsed	232464000	USD
CY2011	ewbc	Interest Spread On Funds Used InterestSpreadOnFundsUsed	847984000	USD
CY2011	ewbc	Credit On Funds Provided CreditOnFundsProvided	232464000	USD
CY2011Q4	ewbc	Interest Bearing Deposit Checking InterestBearingDepositChecking	971179000	USD
CY2011Q4	us-gaap	Deposits Money Market Deposits DepositsMoneyMarketDeposits	4678409000	USD
CY2011Q4	us-gaap	Deposits Savings Deposits DepositsSavingsDeposits	1164618000	USD
CY2011Q4	ewbc	Core Deposits CoreDeposits	10307001000	USD
CY2011Q4	us-gaap	Time Deposits Less Than100000 TimeDepositsLessThan100000	2186604000	USD
CY2011Q4	us-gaap	Time Deposits100000 Or More TimeDeposits100000OrMore	4959397000	USD
CY2012Q4	ewbc	Interest Bearing Deposit Checking InterestBearingDepositChecking	1230372000	USD
CY2012Q4	us-gaap	Deposits Money Market Deposits DepositsMoneyMarketDeposits	5000309000	USD
CY2012Q4	us-gaap	Deposits Savings Deposits DepositsSavingsDeposits	1421182000	USD
CY2012Q4	ewbc	Core Deposits CoreDeposits	12187740000	USD
CY2012Q4	us-gaap	Time Deposits Less Than100000 TimeDepositsLessThan100000	1884577000	USD
CY2012Q4	us-gaap	Time Deposits100000 Or More TimeDeposits100000OrMore	4237037000	USD
CY2012Q4	us-gaap	Time Deposits TimeDeposits	6121614000	USD
CY2012Q4	us-gaap	Time Deposits100000 Or More Foreign TimeDeposits100000OrMoreForeign	319300000	USD
CY2012Q4	us-gaap	Time Deposit Maturities Year One TimeDepositMaturitiesYearOne	5212966000	USD
CY2012Q4	us-gaap	Time Deposit Maturities Year Two TimeDepositMaturitiesYearTwo	445127000	USD
CY2012Q4	us-gaap	Time Deposit Maturities Year Three TimeDepositMaturitiesYearThree	101493000	USD
CY2012Q4	us-gaap	Time Deposit Maturities Year Four TimeDepositMaturitiesYearFour	133547000	USD
CY2012Q4	us-gaap	Time Deposit Maturities Year Five TimeDepositMaturitiesYearFive	179545000	USD
CY2012Q4	us-gaap	Time Deposit Maturities After Year Five TimeDepositMaturitiesAfterYearFive	48936000	USD
CY2012Q4	us-gaap	Deposit Liabilities Accrued Interest DepositLiabilitiesAccruedInterest	4700000	USD
CY2011	ewbc	Interest Spread On Funds Provided InterestSpreadOnFundsProvided	55042000	USD
CY2011	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	-128254000	USD
CY2010	ewbc	Charge For Funds Used ChargeForFundsUsed	239910000	USD
CY2010	ewbc	Interest Spread On Funds Used InterestSpreadOnFundsUsed	855921000	USD
CY2010	ewbc	Credit On Funds Provided CreditOnFundsProvided	239910000	USD
CY2010	ewbc	Interest Spread On Funds Provided InterestSpreadOnFundsProvided	38793000	USD
CY2010	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	-162416000	USD
CY2010Q4	us-gaap	Assets Assets	20700537000	USD
CY2012	ewbc	Charge For Funds Used ChargeForFundsUsed	160092000	USD
CY2012	ewbc	Interest Spread On Funds Used InterestSpreadOnFundsUsed	891003000	USD
CY2012	ewbc	Credit On Funds Provided CreditOnFundsProvided	160092000	USD
CY2012	ewbc	Interest Spread On Funds Provided InterestSpreadOnFundsProvided	27924000	USD
CY2012	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	-43751000	USD
CY2012	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	425592000	USD
CY2011Q2	ewbc	Reversal Of Provision For Loan And Lease Losses ReversalOfProvisionForLoanAndLeaseLosses	972000	USD
CY2012Q4	us-gaap	Preferred Stock Value PreferredStockValue	83027000	USD
CY2012Q4	us-gaap	Common Stock Value Outstanding CommonStockValueOutstanding	157000	USD
CY2011Q1	ewbc	Reversal Of Provision For Loan And Lease Losses ReversalOfProvisionForLoanAndLeaseLosses	1534000	USD
CY2011Q4	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	268904000	USD
CY2011Q3	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	282741000	USD
CY2011Q2	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	274468000	USD
CY2011Q1	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	254335000	USD
CY2011Q4	us-gaap	Interest Expense InterestExpense	39830000	USD
CY2011Q3	us-gaap	Interest Expense InterestExpense	44959000	USD
CY2011Q2	us-gaap	Interest Expense InterestExpense	47132000	USD
CY2011Q1	us-gaap	Interest Expense InterestExpense	45501000	USD
CY2011Q4	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	229074000	USD
CY2011Q3	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	237782000	USD
CY2011Q2	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	227336000	USD
CY2011Q1	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	208834000	USD
CY2011Q4	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	19787000	USD
CY2011Q3	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	22297000	USD
CY2011Q2	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	25528000	USD
CY2011Q1	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	24972000	USD
CY2011Q4	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	209074000	USD
CY2011Q3	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	215782000	USD
CY2011Q2	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	200836000	USD
CY2011Q1	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	182328000	USD
CY2011Q4	us-gaap	Noninterest Income NoninterestIncome	937000	USD
CY2011Q3	us-gaap	Noninterest Income NoninterestIncome	-13545000	USD
CY2011Q2	us-gaap	Noninterest Income NoninterestIncome	12491000	USD
CY2011Q1	us-gaap	Noninterest Income NoninterestIncome	11041000	USD
CY2011Q4	us-gaap	Noninterest Expense NoninterestExpense	106672000	USD
CY2011Q3	us-gaap	Noninterest Expense NoninterestExpense	104552000	USD
CY2011Q2	us-gaap	Noninterest Expense NoninterestExpense	117597000	USD
CY2011Q1	us-gaap	Noninterest Expense NoninterestExpense	106789000	USD
CY2011Q4	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	103339000	USD
CY2011Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	97685000	USD
CY2011Q2	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	95730000	USD
CY2011Q1	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	86580000	USD
CY2011Q4	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	37133000	USD
CY2011Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	35253000	USD
CY2011Q2	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	35205000	USD
CY2011Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	30509000	USD
CY2011Q4	us-gaap	Net Income Loss NetIncomeLoss	66206000	USD
CY2011Q3	us-gaap	Net Income Loss NetIncomeLoss	62432000	USD
CY2011Q2	us-gaap	Net Income Loss NetIncomeLoss	60525000	USD
CY2011Q1	us-gaap	Net Income Loss NetIncomeLoss	56071000	USD
CY2011Q4	us-gaap	Preferred Stock Dividends And Other Adjustments PreferredStockDividendsAndOtherAdjustments	1714000	USD
CY2011Q3	us-gaap	Preferred Stock Dividends And Other Adjustments PreferredStockDividendsAndOtherAdjustments	1714000	USD
CY2011Q2	us-gaap	Preferred Stock Dividends And Other Adjustments PreferredStockDividendsAndOtherAdjustments	1714000	USD
CY2011Q1	us-gaap	Preferred Stock Dividends And Other Adjustments PreferredStockDividendsAndOtherAdjustments	1715000	USD
CY2011Q4	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	64492000	USD
CY2011Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	60718000	USD
CY2011Q2	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	58811000	USD
CY2011Q1	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	54356000	USD
CY2011Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.44
CY2011Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.41
CY2011Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.40
CY2011Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.37
CY2011Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.43
CY2011Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.41
CY2011Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.39
CY2011Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.37
CY2012Q4	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	276521000	USD
CY2012Q3	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	254162000	USD
CY2012Q2	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	266362000	USD
CY2012Q1	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	254050000	USD
CY2012Q4	us-gaap	Interest Expense InterestExpense	31577000	USD
CY2012Q3	us-gaap	Interest Expense InterestExpense	32254000	USD
CY2012Q2	us-gaap	Interest Expense InterestExpense	33205000	USD
CY2012Q1	us-gaap	Interest Expense InterestExpense	35132000	USD
CY2012Q4	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	244944000	USD
CY2012Q3	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	221908000	USD
CY2012Q2	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	233157000	USD
CY2012Q1	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	218918000	USD
CY2012Q4	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	13773000	USD
CY2012Q3	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	13321000	USD
CY2012Q2	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	16595000	USD
CY2012Q1	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	16479000	USD
CY2012Q4	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	231860000	USD
CY2012Q3	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	203408000	USD
CY2012Q2	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	217657000	USD
CY2012Q1	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	200818000	USD
CY2012Q4	us-gaap	Noninterest Income NoninterestIncome	-18254000	USD
CY2012Q3	us-gaap	Noninterest Income NoninterestIncome	2751000	USD
CY2012Q2	us-gaap	Noninterest Income NoninterestIncome	-11655000	USD
CY2012Q1	us-gaap	Noninterest Income NoninterestIncome	21740000	USD
CY2012Q4	us-gaap	Noninterest Expense NoninterestExpense	105206000	USD
CY2012Q3	us-gaap	Noninterest Expense NoninterestExpense	100956000	USD
CY2012Q2	us-gaap	Noninterest Expense NoninterestExpense	101608000	USD
CY2012Q1	us-gaap	Noninterest Expense NoninterestExpense	114763000	USD
CY2012Q4	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	108200000	USD
CY2012Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	105203000	USD
CY2012Q2	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	104394000	USD
CY2012Q1	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	107795000	USD
CY2012Q4	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	36300000	USD
CY2012Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	34093000	USD
CY2012Q2	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	33837000	USD
CY2012Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	39712000	USD
CY2012Q4	us-gaap	Net Income Loss NetIncomeLoss	71900000	USD
CY2012Q3	us-gaap	Net Income Loss NetIncomeLoss	71110000	USD
CY2012Q2	us-gaap	Net Income Loss NetIncomeLoss	70557000	USD
CY2012Q1	us-gaap	Net Income Loss NetIncomeLoss	68083000	USD
CY2012Q4	us-gaap	Preferred Stock Dividends And Other Adjustments PreferredStockDividendsAndOtherAdjustments	1715000	USD
CY2012Q3	us-gaap	Preferred Stock Dividends And Other Adjustments PreferredStockDividendsAndOtherAdjustments	1714000	USD
CY2012Q2	us-gaap	Preferred Stock Dividends And Other Adjustments PreferredStockDividendsAndOtherAdjustments	1714000	USD
CY2012Q1	us-gaap	Preferred Stock Dividends And Other Adjustments PreferredStockDividendsAndOtherAdjustments	1714000	USD
CY2012Q4	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	70185000	USD
CY2012Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	69396000	USD
CY2012Q2	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	68843000	USD
CY2012Q1	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	66369000	USD
CY2012Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.47
CY2012Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.45
CY2012Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.50
CY2012Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.49
CY2012Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.48
CY2012Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.46
CY2012Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	4669000	USD
CY2012Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.49
CY2012Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.48
CY2011	us-gaap	Other Comprehensive Income Loss Before Tax Portion Attributable To Parent OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent	-37114000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment For Sale Of Securities Included In Net Income Tax OtherComprehensiveIncomeLossReclassificationAdjustmentForSaleOfSecuritiesIncludedInNetIncomeTax	318000	USD
CY2011	ewbc	Incremental Common Shares Attributable To Share Based Payment Arrangements Restricted Stock IncrementalCommonSharesAttributableToShareBasedPaymentArrangementsRestrictedStock	718000	shares
CY2011	us-gaap	Incremental Common Shares Attributable To Conversion Of Preferred Stock IncrementalCommonSharesAttributableToConversionOfPreferredStock	5571000	shares
CY2012Q4	us-gaap	Accumulated Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	0	USD
CY2012Q4	us-gaap	Accumulated Other Comprehensive Income Loss Foreign Currency Translation Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax	0	USD
CY2011Q4	us-gaap	Accumulated Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-34800000	USD
CY2011Q4	us-gaap	Accumulated Other Comprehensive Income Loss Foreign Currency Translation Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax	900000	USD
CY2012	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	73910000	USD
CY2011	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	-21264000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment For Sale Of Securities Included In Net Income Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentForSaleOfSecuritiesIncludedInNetIncomeBeforeTax	-757000	USD
CY2011	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment For Sale Of Securities Included In Net Income Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentForSaleOfSecuritiesIncludedInNetIncomeBeforeTax	-9703000	USD
CY2012	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Before Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentBeforeTaxPortionAttributableToParent	73153000	USD
CY2011	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Before Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentBeforeTaxPortionAttributableToParent	-30967000	USD
CY2012	us-gaap	Other Than Temporary Impairment Losses Investments Portion In Other Comprehensive Income Loss Before Tax Portion Attributable To Parent Availableforsale Securities OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParentAvailableforsaleSecurities	5066000	USD
CY2012	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Before Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentBeforeTaxPortionAttributableToParent	-1552000	USD
CY2011	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Before Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentBeforeTaxPortionAttributableToParent	-1317000	USD
CY2012	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	-31042000	USD
CY2011	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	8931000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Before Tax Portion Attributable To Parent OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent	66565000	USD
CY2011	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment For Sale Of Securities Included In Net Income Tax OtherComprehensiveIncomeLossReclassificationAdjustmentForSaleOfSecuritiesIncludedInNetIncomeTax	4075000	USD
CY2012	us-gaap	Other Comprehensive Income Availableforsale Securities Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesTaxPortionAttributableToParent	-30724000	USD
CY2011	us-gaap	Other Comprehensive Income Availableforsale Securities Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesTaxPortionAttributableToParent	13006000	USD
CY2012	us-gaap	Other Than Temporary Impairment Losses Investments Portion In Other Comprehensive Income Loss Tax Portion Attributable To Parent Availableforsale Securities OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossTaxPortionAttributableToParentAvailableforsaleSecurities	-2128000	USD
CY2011	us-gaap	Other Than Temporary Impairment Losses Investments Portion In Other Comprehensive Income Loss Tax Portion Attributable To Parent Availableforsale Securities OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossTaxPortionAttributableToParentAvailableforsaleSecurities	-2143000	USD
CY2012	us-gaap	Other Comprehensive Income Foreign Currency Translation Adjustment Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTranslationAdjustmentTaxPortionAttributableToParent	652000	USD
CY2011	us-gaap	Other Comprehensive Income Foreign Currency Translation Adjustment Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTranslationAdjustmentTaxPortionAttributableToParent	553000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Tax Portion Attributable To Parent1 OtherComprehensiveIncomeLossTaxPortionAttributableToParent1	-27956000	USD
CY2011	us-gaap	Other Comprehensive Income Loss Tax Portion Attributable To Parent1 OtherComprehensiveIncomeLossTaxPortionAttributableToParent1	15588000	USD
CY2012	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent	42429000	USD
CY2011	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent	-17961000	USD
CY2012	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
CY2012	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent	-900000	USD
CY2012	us-gaap	Income Loss Before Extraordinary Items And Cumulative Effect Of Change In Accounting Principle IncomeLossBeforeExtraordinaryItemsAndCumulativeEffectOfChangeInAccountingPrinciple	281065000	USD
CY2012	us-gaap	Preferred Stock Dividends And Other Adjustments PreferredStockDividendsAndOtherAdjustments	6857000	USD
CY2012	us-gaap	Participating Securities Distributed And Undistributed Earnings ParticipatingSecuritiesDistributedAndUndistributedEarnings	3271000	USD
CY2012	ewbc	Net Income Loss Available To Common Stockholders Basic After Participating Securities NetIncomeLossAvailableToCommonStockholdersBasicAfterParticipatingSecurities	270937000	USD
CY2012	ewbc	Amount Of Dilutive Securities Restrictive Stock Awards AmountOfDilutiveSecuritiesRestrictiveStockAwards	47000	USD
CY2012	ewbc	Amount Of Dilutive Securities Convertible Preferred Stock AmountOfDilutiveSecuritiesConvertiblePreferredStock	6857000	USD
CY2012	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	277841000	USD
CY2011	us-gaap	Income Loss Before Extraordinary Items And Cumulative Effect Of Change In Accounting Principle IncomeLossBeforeExtraordinaryItemsAndCumulativeEffectOfChangeInAccountingPrinciple	245234000	USD
CY2011	ewbc	Net Income Loss Available To Common Stockholders Basic After Participating Securities NetIncomeLossAvailableToCommonStockholdersBasicAfterParticipatingSecurities	238377000	USD
CY2011	ewbc	Amount Of Dilutive Securities Restrictive Stock Awards AmountOfDilutiveSecuritiesRestrictiveStockAwards	115000	USD
CY2011	ewbc	Amount Of Dilutive Securities Convertible Preferred Stock AmountOfDilutiveSecuritiesConvertiblePreferredStock	6857000	USD
CY2011	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	245349000	USD
CY2010	us-gaap	Income Loss Before Extraordinary Items And Cumulative Effect Of Change In Accounting Principle IncomeLossBeforeExtraordinaryItemsAndCumulativeEffectOfChangeInAccountingPrinciple	164564000	USD
CY2010	ewbc	Net Income Loss Available To Common Stockholders Basic After Participating Securities NetIncomeLossAvailableToCommonStockholdersBasicAfterParticipatingSecurities	121438000	USD
CY2010	ewbc	Amount Of Dilutive Securities Restrictive Stock Awards AmountOfDilutiveSecuritiesRestrictiveStockAwards	15000	USD
CY2010	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	121453000	USD
CY2012	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	141457000	shares
CY2012	ewbc	Incremental Common Shares Attributable To Share Based Payment Arrangements Stock Options IncrementalCommonSharesAttributableToShareBasedPaymentArrangementsStockOptions	29000	shares
CY2012	ewbc	Incremental Common Shares Attributable To Share Based Payment Arrangements Restricted Stock IncrementalCommonSharesAttributableToShareBasedPaymentArrangementsRestrictedStock	118000	shares
CY2012	us-gaap	Incremental Common Shares Attributable To Conversion Of Preferred Stock IncrementalCommonSharesAttributableToConversionOfPreferredStock	5571000	shares
CY2012	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	147175000	shares
CY2011	ewbc	Incremental Common Shares Attributable To Share Based Payment Arrangements Stock Options IncrementalCommonSharesAttributableToShareBasedPaymentArrangementsStockOptions	62000	shares
CY2011	us-gaap	Incremental Common Shares Attributable To Call Options And Warrants IncrementalCommonSharesAttributableToCallOptionsAndWarrants	23000	shares
CY2010	ewbc	Incremental Common Shares Attributable To Share Based Payment Arrangements Stock Options IncrementalCommonSharesAttributableToShareBasedPaymentArrangementsStockOptions	142000	shares
CY2012Q4	us-gaap	Securities Sold Under Agreements To Repurchase SecuritiesSoldUnderAgreementsToRepurchase	995000000	USD
CY2012Q4	us-gaap	Bank Acceptances Executed And Outstanding BankAcceptancesExecutedAndOutstanding	28612000	USD
CY2012Q4	us-gaap	Long Term Debt LongTermDebt	137178000	USD
CY2010	ewbc	Incremental Common Shares Attributable To Share Based Payment Arrangements Restricted Stock IncrementalCommonSharesAttributableToShareBasedPaymentArrangementsRestrictedStock	370000	shares
CY2010	us-gaap	Incremental Common Shares Attributable To Conversion Of Preferred Stock IncrementalCommonSharesAttributableToConversionOfPreferredStock	8936000	shares
CY2010	us-gaap	Incremental Common Shares Attributable To Call Options And Warrants IncrementalCommonSharesAttributableToCallOptionsAndWarrants	176000	shares
CY2012	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.92
CY2012	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.89
CY2012	us-gaap	Other Comprehensive Income Loss Before Tax OtherComprehensiveIncomeLossBeforeTax	38609000	USD
CY2011	us-gaap	Other Comprehensive Income Loss Before Tax OtherComprehensiveIncomeLossBeforeTax	-21526000	USD
CY2012Q4	us-gaap	Assets Assets	22536110000	USD
CY2012Q4	us-gaap	Federal Home Loan Bank Advances Long Term FederalHomeLoanBankAdvancesLongTerm	312975000	USD
CY2011	us-gaap	Investment Tax Credit InvestmentTaxCredit	11100000	USD
CY2012	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	42868000	USD
CY2012	us-gaap	Interest And Fee Income Loans And Leases InterestAndFeeIncomeLoansAndLeases	945530000	USD
CY2012	us-gaap	Other Than Temporary Impairment Losses Investments Availableforsale Securities OtherThanTemporaryImpairmentLossesInvestmentsAvailableforsaleSecurities	5165000	USD
CY2012Q4	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	1464739000	USD
CY2012Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	1151828000	USD
CY2012Q4	us-gaap	Treasury Stock Value TreasuryStockValue	322298000	USD
CY2012	us-gaap	Labor And Related Expense LaborAndRelatedExpense	171374000	USD
CY2012	us-gaap	Foreclosed Real Estate Expense ForeclosedRealEstateExpense	22349000	USD
CY2010Q4	us-gaap	Stockholders Equity StockholdersEquity	2113931000	USD
CY2012	ewbc	Financing Receivable Number Of Payment Months Considered Sustained Period Of Performance FinancingReceivableNumberOfPaymentMonthsConsideredSustainedPeriodOfPerformance	P6M
CY2012	us-gaap	Other Noninterest Expense OtherNoninterestExpense	59731000	USD
CY2012	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.4
CY2012	ewbc	Fair Value Of Reporting Units Under Income Approach Net Income Projection Period FairValueOfReportingUnitsUnderIncomeApproachNetIncomeProjectionPeriod	P5Y
CY2010Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-12414000	USD
CY2012	ewbc	Financing Receivable Modifications Subsequent Default Recorded Investment Charge Off Or Transferred FinancingReceivableModificationsSubsequentDefaultRecordedInvestmentChargeOffOrTransferred	271000	USD
CY2012	ewbc	Impaired Loans Maximum Number Of Days Past Due For Deficiency To Be Recorded As Specific Reserve ImpairedLoansMaximumNumberOfDaysPastDueForDeficiencyToBeRecordedAsSpecificReserve	P90D
CY2012	ewbc	Amortization And Impairment Write Downs Of Premiums On Deposits Acquired AmortizationAndImpairmentWriteDownsOfPremiumsOnDepositsAcquired	10906000	USD
CY2012	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	9231000	USD
CY2012	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	4015000	USD
CY2011	us-gaap	Repayments Of Notes Payable RepaymentsOfNotesPayable	11250000	USD
CY2010	us-gaap	Repayments Of Notes Payable RepaymentsOfNotesPayable	43365000	USD
CY2012	us-gaap	Interest And Dividend Income Securities InterestAndDividendIncomeSecurities	58184000	USD
CY2012	ewbc	Investment In Federal Home Loan Bank Stock InvestmentInFederalHomeLoanBankStock	1808000	USD
CY2012	ewbc	Investment In Federal Reserve Bank Stock InvestmentInFederalReserveBankStock	2865000	USD
CY2012	ewbc	Short Term Investments As Presented In Statements Of Income ShortTermInvestmentsAsPresentedInStatementsOfIncome	22316000	USD
CY2012	us-gaap	Interest Expense Federal Home Loan Bank And Federal Reserve Bank Advances Long Term InterestExpenseFederalHomeLoanBankAndFederalReserveBankAdvancesLongTerm	6248000	USD
CY2012	us-gaap	Interest Expense Securities Sold Under Agreements To Repurchase InterestExpenseSecuritiesSoldUnderAgreementsToRepurchase	46166000	USD
CY2012	us-gaap	Interest Expense Other Long Term Debt InterestExpenseOtherLongTermDebt	3855000	USD
CY2012	ewbc	Other Borrowings Interest Expense OtherBorrowingsInterestExpense	4000	USD
CY2012	ewbc	Decrease In Fdic Indemnification Asset Receivable DecreaseInFdicIndemnificationAssetReceivable	-122251000	USD
CY2012	ewbc	Branch Fees BranchFees	33604000	USD
CY2012	us-gaap	Fees And Commissions Other FeesAndCommissionsOther	19104000	USD
CY2012	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	7166000	USD
CY2012	us-gaap	Servicing Fees Net ServicingFeesNet	8831000	USD
CY2012	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	17045000	USD
CY2012	us-gaap	Gain Loss On Disposition Of Assets GainLossOnDispositionOfAssets	4275000	USD
CY2012	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	21935000	USD
CY2012	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	14130000	USD
CY2012	us-gaap	Loan Processing Fee LoanProcessingFee	14987000	USD
CY2012	us-gaap	Occupancy Net OccupancyNet	55475000	USD
CY2012	ewbc	Amortization Of Investments In Affordable Housing Partnerships AmortizationOfInvestmentsInAffordableHousingPartnerships	18058000	USD
CY2012	us-gaap	Legal Fees LegalFees	25441000	USD
CY2012	ewbc	Prepayment Penalty For Fhlb Advances And Other Borrowings PrepaymentPenaltyForFhlbAdvancesAndOtherBorrowings	6860000	USD
CY2012	ewbc	Deposit Related Expenses DepositRelatedExpenses	6007000	USD
CY2012	us-gaap	Professional Fees ProfessionalFees	7984000	USD
CY2011	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment For Sale Of Securities Included In Net Income Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentForSaleOfSecuritiesIncludedInNetIncomeNetOfTax	-5628000	USD
CY2010	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment For Sale Of Securities Included In Net Income Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentForSaleOfSecuritiesIncludedInNetIncomeNetOfTax	-18117000	USD
CY2011	ewbc	Other Asset Investments Change In Net Unrealized Holding Gain Loss Net Of Tax OtherAssetInvestmentsChangeInNetUnrealizedHoldingGainLossNetOfTax	194000	USD
CY2010	ewbc	Other Asset Investments Change In Net Unrealized Holding Gain Loss Net Of Tax OtherAssetInvestmentsChangeInNetUnrealizedHoldingGainLossNetOfTax	-177000	USD
CY2012	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	82536000	USD
CY2012	ewbc	Accretion Amortization Of Discount And Premiums Loans And Other Assets AccretionAmortizationOfDiscountAndPremiumsLoansAndOtherAssets	233607000	USD
CY2012	ewbc	Decrease In Fdic Indemnification Asset And Receivable DecreaseInFdicIndemnificationAssetAndReceivable	-122251000	USD
CY2012	us-gaap	Share Based Compensation ShareBasedCompensation	13238000	USD
CY2012	us-gaap	Impairment Of Real Estate ImpairmentOfRealEstate	16035000	USD
CY2012	ewbc	Net Gain On Sales Of Investment Securities Loans And Other Assets NetGainOnSalesOfInvestmentSecuritiesLoansAndOtherAssets	28165000	USD
CY2012	us-gaap	Payments For Origination And Purchases Of Loans Held For Sale PaymentsForOriginationAndPurchasesOfLoansHeldForSale	103059000	USD
CY2012	ewbc	Proceeds From Sales Of Loans Originated As Loans Held For Sale ProceedsFromSalesOfLoansOriginatedAsLoansHeldForSale	13844000	USD
CY2012	ewbc	Net Proceeds From Fdic Shared Loss Agreements NetProceedsFromFdicSharedLossAgreements	76094000	USD
CY2012	ewbc	Net Change In Accrued Interest Receivable And Other Assets NetChangeInAccruedInterestReceivableAndOtherAssets	23393000	USD
CY2012	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	15086000	USD
CY2012	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	-4477000	USD
CY2012	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	337685000	USD
CY2012	us-gaap	Payments For Proceeds From Short Term Investments PaymentsForProceedsFromShortTermInvestments	304544000	USD
CY2012	us-gaap	Payments To Acquire Available For Sale Securities PaymentsToAcquireAvailableForSaleSecurities	1835823000	USD
CY2012	us-gaap	Payments To Acquire Loans Receivable PaymentsToAcquireLoansReceivable	461878000	USD
CY2012	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	10280000	USD
CY2012	ewbc	Investments In Affordable Housing Partnerships InvestmentsInAffordableHousingPartnerships	57831000	USD
CY2012	us-gaap	Proceeds From Sale Of Loans Receivable ProceedsFromSaleOfLoansReceivable	76832000	USD
CY2012	ewbc	Loans Held For Sale Originated For Investment LoansHeldForSaleOriginatedForInvestment	338046000	USD
CY2012	us-gaap	Proceeds From Sale Of Other Real Estate ProceedsFromSaleOfOtherRealEstate	100547000	USD
CY2012	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	18914000	USD
CY2012	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	1119098000	USD
CY2012	us-gaap	Payments For Proceeds From Federal Home Loan Bank Stock PaymentsForProceedsFromFederalHomeLoanBankStock	-29622000	USD
CY2012	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	491000	USD
CY2012	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	856352000	USD
CY2012	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	-5208000	USD
CY2012	us-gaap	Proceeds From Issuance Of Shares Under Incentive And Share Based Compensation Plans Including Stock Options ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions	3821000	USD
CY2012	us-gaap	Repayments Of Other Long Term Debt RepaymentsOfOtherLongTermDebt	75000000	USD
CY2012	us-gaap	Payments Of Ordinary Dividends PaymentsOfOrdinaryDividends	64218000	USD
CY2012	us-gaap	Interest Paid InterestPaid	136760000	USD
CY2012	us-gaap	Effect Of Exchange Rate On Cash And Cash Equivalents Continuing Operations EffectOfExchangeRateOnCashAndCashEquivalentsContinuingOperations	-900000	USD
CY2012	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	183398000	USD
CY2012	us-gaap	Transfer To Other Real Estate TransferToOtherRealEstate	81605000	USD
CY2012	us-gaap	Mortgage Loan Related To Property Sales1 MortgageLoanRelatedToPropertySales1	6380000	USD
CY2012	us-gaap	Loans Assumed1 LoansAssumed1	1018000	USD
CY2012	us-gaap	Stock Issued1 StockIssued1	570000	USD
CY2010	us-gaap	Available For Sale Securities Gross Realized Gains AvailableForSaleSecuritiesGrossRealizedGains	33500000	USD
CY2010	us-gaap	Available For Sale Securities Gross Realized Losses AvailableForSaleSecuritiesGrossRealizedLosses	2300000	USD
CY2010	us-gaap	Available For Sale Securities Gross Realized Gain Loss Net AvailableForSaleSecuritiesGrossRealizedGainLossNet	31200000	USD
CY2010	us-gaap	Available For Sale Securities Gross Realized Gains Losses Sale Proceeds AvailableForSaleSecuritiesGrossRealizedGainsLossesSaleProceeds	1340000000	USD
CY2011Q4	ewbc	Additional Advances Under Shared Loss Agreements AdditionalAdvancesUnderSharedLossAgreements	583800000	USD
CY2011Q4	ewbc	Allowance Allocated To Additional Advances AllowanceAllocatedToAdditionalAdvances	6600000	USD
CY2011Q4	ewbc	Percentage Of Allowance Allocated To Additional Advances PercentageOfAllowanceAllocatedToAdditionalAdvances	0.031	pure
CY2012	ewbc	Loan Discount Related To Loans Removed LoanDiscountRelatedToLoansRemoved	124700000	USD
CY2011	ewbc	Loan Discount Related To Loans Removed LoanDiscountRelatedToLoansRemoved	102100000	USD
CY2010	ewbc	Loan Discount Related To Loans Removed LoanDiscountRelatedToLoansRemoved	135000000	USD
CY2010	ewbc	Proceeds From Sale Of Non Covered Other Real Estate Owned ProceedsFromSaleOfNonCoveredOtherRealEstateOwned	39500000	USD
CY2011Q4	ewbc	Market Capitalization MarketCapitalization	2380000000	USD
CY2011	ewbc	Increase In Unrecognized Tax Benefits Reserve For Enterprise Zone Net Interest Deduction IncreaseInUnrecognizedTaxBenefitsReserveForEnterpriseZoneNetInterestDeduction	1600000	USD
CY2010	us-gaap	Other Comprehensive Income Loss Before Tax OtherComprehensiveIncomeLossBeforeTax	-13013000	USD
CY2009Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	599000	USD
CY2010	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	21645000	USD
CY2010	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment For Sale Of Securities Included In Net Income Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentForSaleOfSecuritiesIncludedInNetIncomeBeforeTax	-31237000	USD
CY2010	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Before Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentBeforeTaxPortionAttributableToParent	-9592000	USD
CY2010	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Before Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentBeforeTaxPortionAttributableToParent	2919000	USD
CY2010	us-gaap	Other Comprehensive Income Loss Before Tax Portion Attributable To Parent OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent	-22436000	USD
CY2010	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	-9091000	USD
CY2010	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment For Sale Of Securities Included In Net Income Tax OtherComprehensiveIncomeLossReclassificationAdjustmentForSaleOfSecuritiesIncludedInNetIncomeTax	13120000	USD
CY2010	us-gaap	Other Comprehensive Income Availableforsale Securities Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesTaxPortionAttributableToParent	4029000	USD
CY2010	us-gaap	Other Than Temporary Impairment Losses Investments Portion In Other Comprehensive Income Loss Tax Portion Attributable To Parent Availableforsale Securities OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossTaxPortionAttributableToParentAvailableforsaleSecurities	-6492000	USD
CY2010	us-gaap	Other Comprehensive Income Foreign Currency Translation Adjustment Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTranslationAdjustmentTaxPortionAttributableToParent	-1226000	USD
CY2010	us-gaap	Other Comprehensive Income Loss Tax Portion Attributable To Parent1 OtherComprehensiveIncomeLossTaxPortionAttributableToParent1	9423000	USD
CY2010	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent	-5563000	USD
CY2011Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary Due Within One Year Of Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryDueWithinOneYearOfBalanceSheetDate	78683000	USD
CY2010	us-gaap	Investment Tax Credit InvestmentTaxCredit	12400000	USD
CY2012Q4	ewbc	Amount Of Previously Suspended Operating Loss Carryforwards To Be Utilized In Current Fiscal Year AmountOfPreviouslySuspendedOperatingLossCarryforwardsToBeUtilizedInCurrentFiscalYear	304400000	USD
CY2012	ewbc	Income Tax And Interest Paid Related To Resolution Of Enterprise Zone Net Interest Deduction IncomeTaxAndInterestPaidRelatedToResolutionOfEnterpriseZoneNetInterestDeduction	935000	USD
CY2012	ewbc	Other Comprehensive Income Loss Reclassification Adjustment For Other Asset Investments Included In Net Income Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentForOtherAssetInvestmentsIncludedInNetIncomeNetOfTax	-13000	USD
CY2011	ewbc	Other Comprehensive Income Loss Reclassification Adjustment For Other Asset Investments Included In Net Income Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentForOtherAssetInvestmentsIncludedInNetIncomeNetOfTax	-35000	USD
CY2012Q4	us-gaap	Federal Home Loan Bank Stock FederalHomeLoanBankStock	107275000	USD
CY2012Q4	us-gaap	Federal Reserve Bank Stock FederalReserveBankStock	48003000	USD
CY2012Q4	us-gaap	Interest Receivable InterestReceivable	94837000	USD
CY2012Q4	us-gaap	Due From Customer Acceptances DueFromCustomerAcceptances	28612000	USD
CY2012Q4	ewbc	Finite Lived Core Deposits Net FiniteLivedCoreDepositsNet	56285000	USD
CY2012Q4	us-gaap	Interest Bearing Deposit Liabilities InterestBearingDepositLiabilities	13773477000	USD
CY2012Q4	ewbc	Accrued Interest Payable Accrued Expenses And Other Liabilities AccruedInterestPayableAccruedExpensesAndOtherLiabilities	350869000	USD
CY2012	ewbc	Provision For Loan Lease And Other Losses Noncovered ProvisionForLoanLeaseAndOtherLossesNoncovered	60168000	USD
CY2012	us-gaap	Dividends Common Stock DividendsCommonStock	57582000	USD
CY2011	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	227000	USD
CY2010	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	10500000	USD
CY2012Q4	us-gaap	Other Borrowings OtherBorrowings	20000000	USD
CY2012Q4	ewbc	Available For Sale Securities Tax Expense On Sale Of Investment Securities AvailableForSaleSecuritiesTaxExpenseOnSaleOfInvestmentSecurities	318000	USD
CY2012	ewbc	Recoveries From Sale Of Non Covered Other Real Estate Owned RecoveriesFromSaleOfNonCoveredOtherRealEstateOwned	2000000	USD
CY2012	ewbc	Other Asset Investments Change In Net Unrealized Holding Gain Loss Before Tax OtherAssetInvestmentsChangeInNetUnrealizedHoldingGainLossBeforeTax	53000	USD
CY2011	ewbc	Other Asset Investments Change In Net Unrealized Holding Gain Loss Before Tax OtherAssetInvestmentsChangeInNetUnrealizedHoldingGainLossBeforeTax	334000	USD
CY2010	ewbc	Other Asset Investments Change In Net Unrealized Holding Gain Loss Before Tax OtherAssetInvestmentsChangeInNetUnrealizedHoldingGainLossBeforeTax	-305000	USD
CY2012	ewbc	Other Comprehensive Income Loss Reclassification Adjustment For Other Asset Investments Included In Net Income Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentForOtherAssetInvestmentsIncludedInNetIncomeBeforeTax	-23000	USD
CY2011	ewbc	Other Comprehensive Income Loss Reclassification Adjustment For Other Asset Investments Included In Net Income Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentForOtherAssetInvestmentsIncludedInNetIncomeBeforeTax	-61000	USD
CY2012	ewbc	Other Asset Investments Change In Net Unrealized Holding Gain Loss Tax OtherAssetInvestmentsChangeInNetUnrealizedHoldingGainLossTax	-22000	USD
CY2011	ewbc	Other Asset Investments Change In Net Unrealized Holding Gain Loss Tax OtherAssetInvestmentsChangeInNetUnrealizedHoldingGainLossTax	-140000	USD
CY2010	ewbc	Other Asset Investments Change In Net Unrealized Holding Gain Loss Tax OtherAssetInvestmentsChangeInNetUnrealizedHoldingGainLossTax	128000	USD
CY2012	ewbc	Other Comprehensive Income Loss Reclassification Adjustment For Other Asset Investments Included In Net Income Tax OtherComprehensiveIncomeLossReclassificationAdjustmentForOtherAssetInvestmentsIncludedInNetIncomeTax	10000	USD
CY2011	ewbc	Other Comprehensive Income Loss Reclassification Adjustment For Other Asset Investments Included In Net Income Tax OtherComprehensiveIncomeLossReclassificationAdjustmentForOtherAssetInvestmentsIncludedInNetIncomeTax	26000	USD
CY2012Q4	ewbc	Federal Home Loan Bank Advances Maturities Average Interest Rate After Four Years From Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesAverageInterestRateAfterFourYearsFromBalanceSheetDate	0.0063	pure
CY2011Q4	ewbc	Federal Home Loan Bank Advances Maturities Average Interest Rate After Four Years From Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesAverageInterestRateAfterFourYearsFromBalanceSheetDate	0.0407	pure
CY2012	ewbc	Number Of Operating Segments Combined NumberOfOperatingSegmentsCombined	2	item
CY2012	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	33815000	USD
CY2011	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	59929000	USD
CY2011Q4	us-gaap	Receivables Change In Method Of Calculating Impairment Recorded Investment ReceivablesChangeInMethodOfCalculatingImpairmentRecordedInvestment	17800000	USD
CY2011Q4	us-gaap	Allowance For Credit Losses Change In Method Of Calculating Impairment AllowanceForCreditLossesChangeInMethodOfCalculatingImpairment	2200000	USD
CY2011Q4	us-gaap	Deferred Tax Liabilities Investment In Noncontrolled Affiliates DeferredTaxLiabilitiesInvestmentInNoncontrolledAffiliates	18995000	USD
CY2012Q4	us-gaap	Deferred Tax Liabilities Investment In Noncontrolled Affiliates DeferredTaxLiabilitiesInvestmentInNoncontrolledAffiliates	20558000	USD
CY2011Q4	us-gaap	Goodwill Goodwill	337438000	USD
CY2012	us-gaap	Loans And Leases Receivable Impaired Interest Lost On Nonaccrual Loans LoansAndLeasesReceivableImpairedInterestLostOnNonaccrualLoans	4937000	USD
CY2011	us-gaap	Loans And Leases Receivable Impaired Interest Lost On Nonaccrual Loans LoansAndLeasesReceivableImpairedInterestLostOnNonaccrualLoans	5865000	USD
CY2010	us-gaap	Loans And Leases Receivable Impaired Interest Lost On Nonaccrual Loans LoansAndLeasesReceivableImpairedInterestLostOnNonaccrualLoans	4809000	USD
CY2012	ewbc	Modification Of Federal Home Loan Bank Advances ModificationOfFederalHomeLoanBankAdvances	48190000	USD
CY2012Q4	ewbc	Investment In Affordable Housing Partnerships Remaining Tax Credits And Other Investments InvestmentInAffordableHousingPartnershipsRemainingTaxCreditsAndOtherInvestments	161400000	USD
CY2012	ewbc	Amortization Of Investments In Affordable Housing And Other Investments AmortizationOfInvestmentsInAffordableHousingAndOtherInvestments	18100000	USD
CY2011	ewbc	Amortization Of Investments In Affordable Housing And Other Investments AmortizationOfInvestmentsInAffordableHousingAndOtherInvestments	17300000	USD
CY2010	ewbc	Amortization Of Investments In Affordable Housing And Other Investments AmortizationOfInvestmentsInAffordableHousingAndOtherInvestments	10000000	USD
CY2011	ewbc	Investment In Affordable Housing Partnerships Impairment Charge And Other Investments InvestmentInAffordableHousingPartnershipsImpairmentChargeAndOtherInvestments	1300000	USD
CY2011	ewbc	Number Of Investment In Affordable Housing Partnerships Sold And Other Investments NumberOfInvestmentInAffordableHousingPartnershipsSoldAndOtherInvestments	3	item
CY2010	ewbc	Number Of Investment In Affordable Housing Partnerships Sold And Other Investments NumberOfInvestmentInAffordableHousingPartnershipsSoldAndOtherInvestments	1	item
CY2011Q4	ewbc	Investment In Affordable Housing Partnerships Sold And Other Investments InvestmentInAffordableHousingPartnershipsSoldAndOtherInvestments	25700000	USD
CY2010Q4	ewbc	Investment In Affordable Housing Partnerships Sold And Other Investments InvestmentInAffordableHousingPartnershipsSoldAndOtherInvestments	3200000	USD
CY2011	ewbc	Loss On Sale Of Investments In Affordable Housing Partnerships And Other Investments LossOnSaleOfInvestmentsInAffordableHousingPartnershipsAndOtherInvestments	3700000	USD
CY2010	ewbc	Loss On Sale Of Investments In Affordable Housing Partnerships And Other Investments LossOnSaleOfInvestmentsInAffordableHousingPartnershipsAndOtherInvestments	1200000	USD
CY2012Q4	ewbc	Federal Home Loan Bank Advances Maturities Summary Due After Four Years Of Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryDueAfterFourYearsOfBalanceSheetDate	312975000	USD
CY2011Q4	ewbc	Federal Home Loan Bank Advances Maturities Summary Due After Four Years Of Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryDueAfterFourYearsOfBalanceSheetDate	221693000	USD
CY2012Q4	ewbc	Portion Of Allowance For Unfunded Loan Commitments Off Balance Sheet Credit Exposures And Recourse Provisions Related To Off Balance Sheet Loans Soldand Securitized PortionOfAllowanceForUnfundedLoanCommitmentsOffBalanceSheetCreditExposuresAndRecourseProvisionsRelatedToOffBalanceSheetLoansSoldandSecuritized	4800000	USD
CY2011Q4	ewbc	Portion Of Allowance For Unfunded Loan Commitments Off Balance Sheet Credit Exposures And Recourse Provisions Related To Off Balance Sheet Loans Soldand Securitized PortionOfAllowanceForUnfundedLoanCommitmentsOffBalanceSheetCreditExposuresAndRecourseProvisionsRelatedToOffBalanceSheetLoansSoldandSecuritized	4400000	USD
CY2012Q4	ewbc	Federal Home Loan Bank Advances Modified FederalHomeLoanBankAdvancesModified	375000000	USD

Files In Submission

Name	View Source	Status
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0001104659-13-016095.txt	Edgar Link	pending
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$EWBC
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2011 Q4 Form 10-K Financial Statement

#000110465913016095 Filed on February 28, 2013

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$EWBC EAST WEST BANCORP INC Stock $ewbc

2011 Q4 Form 10-K Financial Statement

#000110465913016095 Filed on February 28, 2013

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$EWBC
EAST WEST BANCORP INC Stock $ewbc