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LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES (Details 2) (Loans Receivable, USD $) In Billions, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2015 item | Dec. 31, 2014
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |
Loans receivable pledged to secure borrowings and to provide additional borrowing capacity from the FHLB and the Federal Reserve Bank | 14.79 us-gaap_LoansPledgedAsCollateral | $ 14.66 us-gaap_LoansPledgedAsCollateral
Number of grades in the risk rating system utilized by the company to rate credit risk of loans receivable | 8 ewbc_NumberOfGradesRiskRatingSystem |
Residential | Single-family | Minimum |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |
Number of units of residential property securing fixed and adjustable rate first mortgage loans | 1 ewbc_NumberOfUnitsForWhichBothFixedAndAdjustableRateFirstMortgageLoansSecured / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ResidentialPortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_ResidentialSingleFamilyMember / us-gaap_RangeAxis = us-gaap_MinimumMember |
Adjustable rate mortgage, term of initial fixed interest rates | 1 year |
Residential | Single-family | Maximum |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |
Number of units of residential property securing fixed and adjustable rate first mortgage loans | 4 ewbc_NumberOfUnitsForWhichBothFixedAndAdjustableRateFirstMortgageLoansSecured / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ResidentialPortfolioSegmentMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ewbc_ResidentialSingleFamilyMember / us-gaap_RangeAxis = us-gaap_MaximumMember |
Adjustable rate mortgage, term of initial fixed interest rates | 3 years |
Residential | Multifamily | Minimum |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |
Adjustable rate mortgage, term of initial fixed interest rates | 6 months |
Residential | Multifamily | Maximum |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |
Adjustable rate mortgage, term of initial fixed interest rates | 3 years |

X
- Definition The term for an initial interest rate period of an adjustable rate mortgage. + References No definition available. + Details
Name: | ewbc_AdjustableRateMortgageInitialInterestRatePeriod
Namespace Prefix: | ewbc_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of grades in the risk rating system utilized by the company to rate credit risk of loans receivable. Loans are risk rated based on analysis of the current state of the borrower's credit quality. Higher grades represent a higher level of credit risk. + References No definition available. + Details
Name: | ewbc_NumberOfGradesRiskRatingSystem
Namespace Prefix: | ewbc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition The number of units in residential property that secures both fixed and adjustable rate first mortgage loans. + References No definition available. + Details
Name: | ewbc_NumberOfUnitsForWhichBothFixedAndAdjustableRateFirstMortgageLoansSecured
Namespace Prefix: | ewbc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_AccountsNotesAndLoansReceivableLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Carrying amount as of the balance sheet date of loans that have been pledged as collateral for borrowings. If the secured party has the right by contract or custom to sell or re-pledge the collateral, then the debtor reclassifies that asset and report that asset in its statement of financial position separately from other assets not so encumbered. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5086-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6467456&loc=d3e113888-111728 + Details
Name: | us-gaap_LoansPledgedAsCollateral
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis=us-gaap_ResidentialPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |