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FAIR VALUE (Details 2) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013
Covered OREO |  |  |  |  |  |  |  |
Percentage of eligible losses for which the FDIC is obligated to reimburse the Company | 80.00% |  | 80.00% |  | 80.00% |  | 80.00% |
Percentage of company's liability for losses under shared loss agreements | 20.00% |  | 20.00% |  | 20.00% |  | 20.00% |
Fair Value, Measurements, Non-Recurring |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Nonrecurring Basis |  |  |  |  |  |  |  |
Total gains (losses) | $ (7,364) |  | $ (1,480) |  | $ (10,302) |  | $ (6,300) |
Covered OREO |  |  |  |  |  |  |  |
Company's liability for losses under shared loss agreements | 14 |  | 200 |  | 104 |  | 225 |
Fair Value, Measurements, Non-Recurring | Non-covered OREO |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Nonrecurring Basis |  |  |  |  |  |  |  |
Total gains (losses) |  |  | (18) |  | (74) |  | (1,403) |
Fair Value, Measurements, Non-Recurring | Covered OREO |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Nonrecurring Basis |  |  |  |  |  |  |  |
Total gains (losses) | (69) | [1] | (1,000) | [1] | (521) | [2] | (1,126) | [2]
Fair Value, Measurements, Non-Recurring | Residential |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Nonrecurring Basis |  |  |  |  |  |  |  |
Total gains (losses) | 413 |  | (838) |  | 27 |  | (1,274) |
Fair Value, Measurements, Non-Recurring | Commercial real estate |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Nonrecurring Basis |  |  |  |  |  |  |  |
Total gains (losses) | 1,865 |  | (1,320) |  | 1,376 |  | (3,422) |
Fair Value, Measurements, Non-Recurring | Commercial and Industrial ("C&I") |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Nonrecurring Basis |  |  |  |  |  |  |  |
Total gains (losses) | (9,642) |  | 674 |  | (11,705) |  | (1,492) |
Fair Value, Measurements, Non-Recurring | Consumer |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Nonrecurring Basis |  |  |  |  |  |  |  |
Total gains (losses) |  |  | 4 |  |  |  | (112) |
Fair Value, Measurements, Non-Recurring | Fair Value Measurements |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Nonrecurring Basis |  |  |  |  |  |  |  |
Non-covered loans | 50,503 |  | 66,936 |  | 50,503 |  | 66,936 |
Non-covered loans | 41,074 |  | 60,384 |  | 41,074 |  | 60,384 |
Fair Value, Measurements, Non-Recurring | Fair Value Measurements | Non-covered OREO |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Nonrecurring Basis |  |  |  |  |  |  |  |
Non-covered OREO | 676 |  | 435 |  | 676 |  | 435 |
Non-covered OREO | 676 |  | 13,238 |  | 676 |  | 13,238 |
Fair Value, Measurements, Non-Recurring | Fair Value Measurements | Covered OREO |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Nonrecurring Basis |  |  |  |  |  |  |  |
Covered OREO | 4,009 | [1] | 7,500 | [1] | 4,009 | [1] | 7,500 | [1]
Covered OREO | 4,009 | [2] | 11,030 | [2] | 4,009 | [2] | 11,030 | [2]
Fair Value, Measurements, Non-Recurring | Fair Value Measurements | Residential |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Nonrecurring Basis |  |  |  |  |  |  |  |
Non-covered loans | 17,908 |  | 22,012 |  | 17,908 |  | 22,012 |
Non-covered loans | 9,800 |  | 19,971 |  | 9,800 |  | 19,971 |
Fair Value, Measurements, Non-Recurring | Fair Value Measurements | Commercial real estate |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Nonrecurring Basis |  |  |  |  |  |  |  |
Non-covered loans | 22,758 |  | 35,349 |  | 22,758 |  | 35,349 |
Non-covered loans | 22,333 |  | 30,397 |  | 22,333 |  | 30,397 |
Fair Value, Measurements, Non-Recurring | Fair Value Measurements | Commercial and Industrial ("C&I") |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Nonrecurring Basis |  |  |  |  |  |  |  |
Non-covered loans | 9,837 |  | 9,203 |  | 9,837 |  | 9,203 |
Non-covered loans | 8,941 |  | 9,723 |  | 8,941 |  | 9,723 |
Fair Value, Measurements, Non-Recurring | Fair Value Measurements | Consumer |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Nonrecurring Basis |  |  |  |  |  |  |  |
Non-covered loans |  |  | 372 |  |  |  | 372 |
Non-covered loans |  |  | 293 |  |  |  | 293 |
Fair Value, Measurements, Non-Recurring | Significant Unobservable Inputs (Level 3) |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Nonrecurring Basis |  |  |  |  |  |  |  |
Non-covered loans | 50,503 |  | 66,936 |  | 50,503 |  | 66,936 |
Non-covered loans | 41,074 |  | 60,384 |  | 41,074 |  | 60,384 |
Fair Value, Measurements, Non-Recurring | Significant Unobservable Inputs (Level 3) | Non-covered OREO |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Nonrecurring Basis |  |  |  |  |  |  |  |
Non-covered OREO | 676 |  | 435 |  | 676 |  | 435 |
Non-covered OREO | 676 |  | 13,238 |  | 676 |  | 13,238 |
Fair Value, Measurements, Non-Recurring | Significant Unobservable Inputs (Level 3) | Covered OREO |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Nonrecurring Basis |  |  |  |  |  |  |  |
Covered OREO | 4,009 | [1] | 7,500 | [1] | 4,009 | [1] | 7,500 | [1]
Covered OREO | 4,009 | [2] | 11,030 | [2] | 4,009 | [2] | 11,030 | [2]
Fair Value, Measurements, Non-Recurring | Significant Unobservable Inputs (Level 3) | Residential |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Nonrecurring Basis |  |  |  |  |  |  |  |
Non-covered loans | 17,908 |  | 22,012 |  | 17,908 |  | 22,012 |
Non-covered loans | 9,800 |  | 19,971 |  | 9,800 |  | 19,971 |
Fair Value, Measurements, Non-Recurring | Significant Unobservable Inputs (Level 3) | Commercial real estate |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Nonrecurring Basis |  |  |  |  |  |  |  |
Non-covered loans | 22,758 |  | 35,349 |  | 22,758 |  | 35,349 |
Non-covered loans | 22,333 |  | 30,397 |  | 22,333 |  | 30,397 |
Fair Value, Measurements, Non-Recurring | Significant Unobservable Inputs (Level 3) | Commercial and Industrial ("C&I") |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Nonrecurring Basis |  |  |  |  |  |  |  |
Non-covered loans | 9,837 |  | 9,203 |  | 9,837 |  | 9,203 |
Non-covered loans | 8,941 |  | 9,723 |  | 8,941 |  | 9,723 |
Fair Value, Measurements, Non-Recurring | Significant Unobservable Inputs (Level 3) | Consumer |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Nonrecurring Basis |  |  |  |  |  |  |  |
Non-covered loans |  |  | 372 |  |  |  | 372 |
Non-covered loans |  |  | $ 293 |  |  |  | $ 293 |
[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 $69 thousand in losses, or $14 thousand, and 20% of the $1.0 million in losses, or $200 thousand, for the three months ended June 30, 2014 and 2013, respectively.
[2] | 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 $521 thousand in losses, or $104 thousand, and 20% of the $1.1 million in losses, or $225 thousand, for the six months ended June 30, 2014 and 2013, respectively.

X
- Definition Amount of gain (loss) recognized in the income statement for an asset measured on a nonrecurring basis. + References No definition available. + Details
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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 for which there was a gain or loss recognized in the current quarter. + References No definition available. + Details
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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 for which there was a gain or loss recognized in the current year to date period. + References No definition available. + Details
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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 covered other real estate owned resulting from acquisitions for which the company entered into shared-loss agreements in the current quarter. + References No definition available. + Details
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Namespace Prefix: | ewbc_
Data Type: | xbrli:monetaryItemType
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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 covered other real estate owned resulting from acquisitions for which the company entered into shared-loss agreements in the current year to date period. + References No definition available. + Details
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Namespace Prefix: | ewbc_
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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 other real estate owned in the current quarter. + References No definition available. + Details
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Namespace Prefix: | ewbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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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 other real estate owned in the current year to date period. + References No definition available. + Details
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- 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

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- Definition Percentage of eligible losses for which the FDIC is obligated to reimburse the Company pursuant to the shared-loss agreements. + References No definition available. + Details
Name: | ewbc_PercentageOfEligibleLossesForWhichFdicIsObligatedToReimburse
Namespace Prefix: | ewbc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The portion of eligible losses during the period for which the company will not be reimbursed under shared-loss agreements, related to covered other real estate owned. + References No definition available. + Details
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Balance Type: | debit
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