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COVERED ASSETS AND FDIC INDEMNIFICATION ASSET, FDIC Indemnification Asset and FDIC Receivable (Details) (USD $) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2011 | Jun. 30, 2010 | Jun. 30, 2011 | Jun. 30, 2010 | Dec. 31, 2010
FDIC indemnification asset activity [Rollforward] |  |  |  |  |  |  |  |  |
Balance at beginning of period | $ 717,260,000 |  | $ 980,950,000 |  | $ 792,133,000 |  | $ 1,091,814,000 |  |
Addition due to WFIB acquisition | 0 |  | 41,131,000 |  | 0 |  | 41,131,000 |  |
(Amortization) Accretion | (15,432,000) |  | 10,624,000 |  | (33,709,000) |  | 22,092,000 |  |
Reductions | (64,293,000) | [1],[2] | (85,694,000) | [1],[2] | (120,889,000) | [1],[2] | (208,026,000) | [1],[2] |
Balance at end of period | 637,535,000 |  | 947,011,000 |  | 637,535,000 |  | 947,011,000 |  |
Amount of chargeoffs recoverable from the FDIC | 42,800,000 |  | 56,100,000 |  | 74,300,000 |  | 118,000,000 |  |
FDIC Receivable [Abstract] |  |  |  |  |  |  |  |  |
FDIC loss sharing receivable | $ 79,800,000 |  |  |  | $ 79,800,000 |  |  |  | $ 55,500,000
Percentage of any reimbursable expense recorded as noninterest income (in hundredths) | 80.00% |  |  |  | 80.00% |  |  |  |
Percentage of reimbursable expenses recorded as non-interest expense (in hundredths) | 100.00% |  |  |  | 100.00% |  |  |  |
Percentage of actual expense paid by the Company (in hundredths) | 20.00% |  |  |  | 20.00% |  |  |  |
[1] | For the three and six months ended June 30, 2011, the reduction amounts of $64.3 million and $120.9 million, respectively, include charge-offs, of which $42.8 million and $74.3 million, respectively, of these charge-offs are recoverable from the FDIC and recorded in other assets. For the three and six months ended June 30, 2010, the reduction amounts of $85.7 million and $208.0 million, respectively, also include charge-offs, of which $56.1 million and $118.0 million, respectively, is recoverable from the FDIC and recorded in other assets.
[2] | Reductions relate to higher cash flows received from principal amortization, partial prepayments, loan payoffs and loan sales.

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- Definition (Amortization) accretion related to the FDIC indemnification asset. + Details
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Namespace Prefix: | ewbc
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Additions in the FDIC indemnification asset due to acquisition. + Details
Name: | ewbc_AdditionDueToWfibAcquisition
Namespace Prefix: | ewbc
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The amount of chargeoffs that are included in reductions to the FDIC indemnification asset that are recoverable from the FDIC and recorded in other assets. + Details
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Namespace Prefix: | ewbc
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Net present value of the amount expected to be received from the FDIC in relation to the related loss share agreement. + Details
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Namespace Prefix: | ewbc
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + Details
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Balance Type: | na
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- Definition The carrying amount as of the balance sheet date of the FDIC loss sharing receivable which represents the amounts reimbursable from the FDIC that have not yet been received. + Details
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Namespace Prefix: | ewbc
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Details
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Balance Type: | na
Period Type: | duration

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- Definition The percentage of the actual expenses paid by the Company representing the net of the reimbursable expenses recorded in noninterest expense over the reimbursable expenses recorded in noninterest income. + Details
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Balance Type: | na
Period Type: | instant

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- Definition The percentage of any reimbursable expense (chargeoffs, loan related expenses and OREO related expenses) that is recorded as noninterest income on the Condensed Consolidated Statement of Income. + Details
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Balance Type: | na
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- Definition The percentage of reimbursable expenses (loan related and OREO expenses) recorded as non-interest expense on the Condensed Consolidated Statements of Income. + Details
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- Definition Reductions in the FDIC indemnification asset. + Details
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Namespace Prefix: | ewbc
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration