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FAIR VALUE MEASUREMENT AND FAIR VALUE OF FINANCIAL INSTRUMENTS (Details 4) (Fair Value, Measurements, Nonrecurring, USD $) In Thousands, unless otherwise specified | Sep. 30, 2014 | Dec. 31, 2013
--- | --- | ---
Fair Value Measurements |  |
Fair Value, Assets Measured on Nonrecurring Basis |  |
Non-covered loans | $ 56,514 | $ 57,751
Fair Value Measurements | Non-covered OREO |  |
Fair Value, Assets Measured on Nonrecurring Basis |  |
Non-covered OREO | 15,556 | 13,031
Fair Value Measurements | Covered OREO |  |
Fair Value, Assets Measured on Nonrecurring Basis |  |
Covered OREO | 2,400 | 17,284
Fair Value Measurements | Residential |  |
Fair Value, Assets Measured on Nonrecurring Basis |  |
Non-covered loans | 19,930 | 12,791
Fair Value Measurements | Commercial real estate |  |
Fair Value, Assets Measured on Nonrecurring Basis |  |
Non-covered loans | 25,122 | 29,559
Fair Value Measurements | Commercial and Industrial ("C&I") |  |
Fair Value, Assets Measured on Nonrecurring Basis |  |
Non-covered loans | 11,355 | 15,120
Fair Value Measurements | Consumer |  |
Fair Value, Assets Measured on Nonrecurring Basis |  |
Non-covered loans | 107 | 281
Significant Unobservable Inputs (Level 3) |  |
Fair Value, Assets Measured on Nonrecurring Basis |  |
Non-covered loans | 56,514 | 57,751
Significant Unobservable Inputs (Level 3) | Non-covered OREO |  |
Fair Value, Assets Measured on Nonrecurring Basis |  |
Non-covered OREO | 15,556 | 13,031
Significant Unobservable Inputs (Level 3) | Covered OREO |  |
Fair Value, Assets Measured on Nonrecurring Basis |  |
Covered OREO | 2,400 | 17,284
Significant Unobservable Inputs (Level 3) | Non-covered impaired loans |  |
Fair Value, Assets Measured on Nonrecurring Basis |  |
Non-covered loans | 56,514 | 57,751
Significant Unobservable Inputs (Level 3) | Residential |  |
Fair Value, Assets Measured on Nonrecurring Basis |  |
Non-covered loans | 19,930 | 12,791
Significant Unobservable Inputs (Level 3) | Commercial real estate |  |
Fair Value, Assets Measured on Nonrecurring Basis |  |
Non-covered loans | 25,122 | 29,559
Significant Unobservable Inputs (Level 3) | Commercial and Industrial ("C&I") |  |
Fair Value, Assets Measured on Nonrecurring Basis |  |
Non-covered loans | 11,355 | 15,120
Significant Unobservable Inputs (Level 3) | Consumer |  |
Fair Value, Assets Measured on Nonrecurring Basis |  |
Non-covered loans | $ 107 | $ 281

X
- 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 for which there was a gain or loss recognized in the current period. + References No definition available. + Details
Name: | ewbc_LoansReceivableNoncoveredFairValueDisclosure
Namespace Prefix: | ewbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- 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 covered other real estate owned resulting from acquisitions for which the company entered into shared-loss agreements in the current period. + References No definition available. + Details
Name: | ewbc_OtherRealEstateOwnedCoveredFairValueDisclosure
Namespace Prefix: | ewbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- 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 other real estate owned in the current period. + References No definition available. + Details
Name: | ewbc_OtherRealEstateOwnedNoncoveredFairValueDisclosure
Namespace Prefix: | ewbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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