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FAIR VALUE (Details 2) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2011 | Dec. 31, 2010
Non-covered impaired loans |  |  |  |
Non-covered OREO | $ 29,300,000 |  |  |
Covered OREO | 63,600,000 |  |  |
FDIC percentage of reimbursement under shared loss agreements | 80.00% |  |  |
Percentage of company's liability for losses under shared loss agreements | 20.00% |  | 20.00% |
Company's liability for losses under shared loss agreements | 5,300,000 |  | 8,800,000 |
Total eligible losses subject to shared loss agreements | 26,300,000 |  | 44,000,000 |
Fair Value, Measurements, Nonrecurring | Fair Value Measurements |  |  |  |
Non-covered impaired loans |  |  |  |
Total residential | 16,626,000 |  | 7,486,000 |
Total commercial real estate | 45,679,000 |  | 39,325,000 |
Total commercial and industrial | 12,516,000 |  | 6,405,000 |
Total consumer |  |  | 538,000 |
Total non-covered impaired loans | 74,821,000 |  | 53,754,000 |
Mortgage servicing assets (single-family, multifamily and commercial) | 11,252,000 |  | 14,509,000 |
Non-covered OREO | 8,491,000 |  | 12,940,000 |
Covered OREO | 35,926,000 | [1] | 54,919,000 | [1]
Loans Held for Sale | 14,527,000 |  | 14,559,000 |
Investment in affordable housing partnerships | 7,726,000 |  |  |
Fair Value, Measurements, Nonrecurring | Significant Other Observable Inputs (Level 2) |  |  |  |
Non-covered impaired loans |  |  |  |
Total residential | 16,626,000 |  | 7,486,000 |
Total commercial real estate | 45,679,000 |  | 39,325,000 |
Total consumer |  |  | 538,000 |
Total non-covered impaired loans | 62,305,000 |  | 47,349,000 |
Non-covered OREO | 8,491,000 |  | 12,940,000 |
Covered OREO | 35,926,000 | [1] | 54,919,000 | [1]
Fair Value, Measurements, Nonrecurring | Significant Unobservable Inputs (Level 3) |  |  |  |
Non-covered impaired loans |  |  |  |
Total commercial and industrial | 12,516,000 |  | 6,405,000 |
Total non-covered impaired loans | 12,516,000 |  | 6,405,000 |
Mortgage servicing assets (single-family, multifamily and commercial) | 11,252,000 |  | 14,509,000 |
Loans Held for Sale | 14,527,000 |  | 14,559,000 |
Investment in affordable housing partnerships | 7,726,000 |  |  |
Fair Value, Measurements, Nonrecurring | Total Gains (Losses) |  |  |  |
Non-covered impaired loans |  |  |  |
Total residential | (7,380,000) |  | (2,955,000) |
Total commercial real estate | (39,839,000) |  | (25,229,000) |
Total commercial and industrial | (14,330,000) |  | (6,427,000) |
Total consumer |  |  | (641,000) |
Total non-covered impaired loans | (61,549,000) |  | (35,252,000) |
Mortgage servicing assets (single-family, multifamily and commercial) | (927,000) |  | (808,000) |
Non-covered OREO | (3,015,000) |  | (7,054,000) |
Covered OREO | (26,251,000) | [1] | (44,002,000) | [1]
Loans Held for Sale | (12,867,000) |  | (4,104,000) |
Investment in affordable housing partnerships | $ (1,296,000) |  |  |
[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 $26.3 million in losses, or $5.3 million, and 20% of the $44.0 million in losses, or $8.8 million, for the year ended December 31, 2011 and 2010, 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
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- Definition The fair value of investments in limited partnership interests in projects of affordable housing for lower income tenants, which have related tax credits. + 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. This item represents loans held-for-sale as presented on the statement of financial position which may include mortgage loans held-for-sale, finance receivables held-for-sale, or any other loans classified as held-for-sale which are due the Company as of the balance sheet date. + References No definition available. + Details
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- Definition Fair value as of the balance sheet date of an asset representing net future revenues from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements. + 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 impaired loans receivable related to commercial and industrial real estate with loss recognized in earnings In current period. + References No definition available. + Details
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Namespace Prefix: | ewbc_
Data Type: | xbrli:monetaryItemType
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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 impaired loans receivable related to commercial real estate with loss recognized in earnings In current 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 all non-covered impaired consumer loans receivable with loss recognized in earnings In current period. + 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 non-covered impaired loans receivable related to residential real estate with loss recognized in earnings In current period. + References No definition available. + Details
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- 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 the total of all non-covered impaired loans receivable with loss recognized in earnings In current 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 the total of all non-covered other real estate owned. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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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
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Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition The percentage of future losses on the OREO that the FDIC will absorb under the shared-loss agreements. + References No definition available. + Details
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Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition The total eligible losses subject to reimbursement under shared-loss agreements. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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