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NON-COVERED LOANS AND ALLOWANCE FOR LOAN LOSSES (Details 2) (USD $) | 12 Months Ended
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Dec. 31, 2013 item | Dec. 31, 2012 item
Non-Covered loans receivable disclosures |  |
Accrued interest on covered and non-covered loans receivable | $ 94,500,000 | $ 76,800,000
Covered and non-covered loans receivable pledged to secure borrowings from the FHLB and the Federal Reserve Bank | 10,570,000,000 | 8,880,000,000
Number of loans negatively amortizing | 0 | 0
Residential | Minimum |  |
Non-Covered loans receivable disclosures |  |
Number of units of residential property securing fixed and adjustable rate first mortgage loans | 1 |
Residential | Maximum |  |
Non-Covered loans receivable disclosures |  |
Number of units of residential property securing fixed and adjustable rate first mortgage loans | 4 |
Ratio of mortgage loans with variable payment option features to total mortgage loans within same portfolio category (as a percent) | 1.00% | 1.00%
Residential | Single-family |  |
Non-Covered loans receivable disclosures |  |
New first mortgage loans originated | 1,620,000,000 | 735,300,000
Residential | Single-family | Minimum |  |
Non-Covered loans receivable disclosures |  |
Adjustable rate mortgage, term of initial fixed interest rates | 1 year |
Residential | Single-family | Maximum |  |
Non-Covered loans receivable disclosures |  |
Adjustable rate mortgage, term of initial fixed interest rates | 3 years |
Loans to value ratio (as a percent) | 60.00% |
Ratio of mortgage loans with interest-only features to total mortgage loans within same portfolio category (as a percent) | 1.00% | 1.00%
Residential | Multifamily |  |
Non-Covered loans receivable disclosures |  |
New first mortgage loans originated | $ 247,100,000 | $ 128,400,000
Residential | Multifamily | Minimum |  |
Non-Covered loans receivable disclosures |  |
Adjustable rate mortgage, term of initial fixed interest rates | 6 months |
Residential | Multifamily | Midrange |  |
Non-Covered loans receivable disclosures |  |
Adjustable rate mortgage, term of initial fixed interest rates | 3 years |
Residential | Multifamily | Maximum |  |
Non-Covered loans receivable disclosures |  |
Adjustable rate mortgage, term of initial fixed interest rates | 5 years |

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- Definition Carrying amount as of the balance sheet date of interest earned on loans receivable but not received. + References No definition available. + Details
Name: | ewbc_AccruedInterestOnLoansReceivable
Namespace Prefix: | ewbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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 Total amount of new first mortgage loans during the reporting period. + References No definition available. + Details
Name: | ewbc_FirstMortgageLoansNewMortgageLoans
Namespace Prefix: | ewbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the loans to value ratio of original loans. + References No definition available. + Details
Name: | ewbc_LoansToValueRatio
Namespace Prefix: | ewbc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of loans negatively amortizing. + References No definition available. + Details
Name: | ewbc_NumberOfLoansNegativelyAmortizing
Namespace Prefix: | ewbc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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
- Definition The ratio of mortgage loans within a portfolio category that offer the borrower interest-only features to the total mortgage loans of that portfolio category as of the balance sheet date. + References No definition available. + Details
Name: | ewbc_RatioOfMortgageLoansWithInterestOnlyFeaturesToTotalMortgageLoansWithinTheSamePortfolio
Namespace Prefix: | ewbc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The ratio of mortgage loans within a portfolio category that offer the borrower variable payment option features to the total mortgage loans of that portfolio category as of the balance sheet date. + References No definition available. + Details
Name: | ewbc_RatioOfMortgageLoansWithVariablePaymentOptionFeaturesToTotalMortgageLoansWithinTheSamePortfolio
Namespace Prefix: | ewbc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Details
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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=28368275&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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant