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FAIR VALUE (Details 2) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2014 | Mar. 31, 2013
Covered OREO |  |  |  |
Percentage of company's liability for losses under shared loss agreements | 20.00% |  | 20.00% |
Company's liability for losses under shared loss agreements | $ 452 |  | $ 126 |
Total eligible losses subject to shared loss agreements | 90 |  | 25 |
Fair Value, Measurements, Non-Recurring | Fair Value Measurements |  |  |  |
Non-covered loans: |  |  |  |
Total residential | 17,132 |  | 12,969 |
Total commercial real estate | 25,888 |  | 23,382 |
Total commercial and industrial | 13,272 |  | 2,566 |
Total consumer |  |  | 665 |
Total non-covered loans | 56,292 |  | 39,582 |
Non-covered OREO | 745 |  | 13,227 |
Covered OREO | 899 |  | 3,720 |
Fair Value, Measurements, Non-Recurring | Significant Unobservable Inputs (Level 3) |  |  |  |
Non-covered loans: |  |  |  |
Total residential | 17,132 |  | 12,969 |
Total commercial real estate | 25,888 |  | 23,382 |
Total commercial and industrial | 13,272 |  | 2,566 |
Total consumer |  |  | 665 |
Total non-covered loans | 56,292 |  | 39,582 |
Non-covered OREO | 745 |  | 13,227 |
Covered OREO | 899 |  | 3,720 |
Fair Value, Measurements, Non-Recurring | Total Gains (Losses) |  |  |  |
Non-covered loans: |  |  |  |
Total residential | (365) |  | (440) |
Total commercial real estate | (464) |  | (2,115) |
Total commercial and industrial | (6,530) |  | (2,258) |
Total consumer |  |  | (116) |
Total non-covered loans | (7,359) |  | (4,929) |
Non-covered OREO | (74) |  | (1,385) |
Covered OREO | $ (452) | [1] | $ (126) | [1]
[1] | Covered OREO results from the WFIB and UCB FDIC-assisted acquisitions for which the Company entered into shared-loss agreements with the FDIC whereby the FDIC will reimburse the Company for 80% of eligible losses. As such, the Company's liability for losses is 20% of the $452 thousand in losses, or $90 thousand, and 20% of the $126 thousand, or $25 thousand, for the three months ended March 31, 2014 and 2013, respectively.

X
- Definition The company's liability for eligible losses under shared-loss agreements. + References No definition available. + Details
Name: | ewbc_CompanysLiabilityForLossesUnderSharedLossAgreements
Namespace Prefix: | ewbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. The element may be used in both the balance sheet and disclosure in the same submission. This item represents the total of all covered other real estate owned resulting from acquisitions for which the company entered into shared-loss agreements. + References No definition available. + Details
Name: | ewbc_CoveredOtherRealEstateOwnedFairValueDisclosure
Namespace Prefix: | ewbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. The element may be used in both the balance sheet and disclosure in the same submission. This item represents non-covered loans receivable related to commercial and industrial real estate with loss recognized in earnings in current period. + References No definition available. + Details
Name: | ewbc_NoncoveredLoansCommercialAndIndustrialRealEstateWithRealizedLossInCurrentPeriodFairValueDisclosure
Namespace Prefix: | ewbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. The element may be used in both the balance sheet and disclosure in the same submission. This item represents non-covered loans receivable related to commercial real estate with loss recognized in earnings in current period. + References No definition available. + Details
Name: | ewbc_NoncoveredLoansCommercialRealEstateWithRealizedLossInCurrentPeriodFairValueDisclosure
Namespace Prefix: | ewbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. The element may be used in both the balance sheet and disclosure in the same submission. This item represents all non-covered consumer loans receivable with loss recognized in earnings in current period. + References No definition available. + Details
Name: | ewbc_NoncoveredLoansConsumerWithRealizedLossInCurrentPeriodFairValueDisclosure
Namespace Prefix: | ewbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. The element may be used in both the balance sheet and disclosure in the same submission. This item represents non-covered loans receivable related to residential real estate with loss recognized in earnings In current period. + References No definition available. + Details
Name: | ewbc_NoncoveredLoansResidentialWithRealizedLossInCurrentPeriodFairValueDisclosure
Namespace Prefix: | ewbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
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Namespace Prefix: | ewbc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. The element may be used in both the balance sheet and disclosure in the same submission. This item represents the total of all non-covered loans receivable with loss recognized in earnings in current period. + References No definition available. + Details
Name: | ewbc_NoncoveredLoansWithRealizedLossInCurrentPeriodFairValueDisclosure
Namespace Prefix: | ewbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. The element may be used in both the balance sheet and disclosure in the same submission. This item represents the total of all non-covered other real estate owned. + References No definition available. + Details
Name: | ewbc_NoncoveredOtherRealEstateOwnedFairValueDisclosure
Namespace Prefix: | ewbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The percentage of losses related to other real estate owned for which the company retains liability. + References No definition available. + Details
Name: | ewbc_PercentageOfCompanysLiabilityForLossesUnderSharedLossAgreements
Namespace Prefix: | ewbc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The total eligible losses subject to reimbursement under shared-loss agreements. + References No definition available. + Details
Name: | ewbc_TotalEligibleLossesSubjectToSharedLossAgreements
Namespace Prefix: | ewbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | us-gaap_BankingAndThriftAbstract
Namespace Prefix: | us-gaap_
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