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COVERED ASSETS AND FDIC INDEMNIFICATION ASSET, FDIC Indemnification Asset and FDIC Receivable (Details) (USD $) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2011 | Sep. 30, 2010 | Sep. 30, 2011 | Sep. 30, 2010 | Dec. 31, 2010
FDIC indemnification asset activitis [Rollforward] |  |  |  |  |  |  |  |  |
Balance at beginning of period | $ 630,437,000 |  | $ 939,913,000 |  | $ 785,035,000 |  | $ 1,084,716,000 |  |
Addition due to WFIB acquisition | 0 |  | 0 |  | 0 |  | 41,131,000 |  |
(Amortization) Accretion | (14,325,000) |  | 7,118,000 |  | (48,034,000) |  | 29,210,000 |  |
Reductions | (43,349,000) | [1],[2] | (79,370,000) | [1],[2] | (164,238,000) | [1],[2] | (287,396,000) | [1],[2] |
Estimate of FDIC repayment | (3,606,000) | [3] | 0 | [3] | (3,606,000) | [3] | 0 | [3] |
Balance at end of period | 569,157,000 |  | 867,661,000 |  | 569,157,000 |  | 867,661,000 |  |
Amount of chargeoffs recoverable from the FDIC | 18,400,000 |  | 70,800,000 |  | 92,800,000 |  | 188,800,000 |  |
FDIC Receivable [Abstract] |  |  |  |  |  |  |  |  |
FDIC loss sharing receivable | $ 51,800,000 |  |  |  | $ 51,800,000 |  |  |  | $ 62,600,000
Percentage of any reimbursable expense recorded as noninterest income (in hundredths) | 80.00% |  |  |  | 80.00% |  |  |  | 80.00%
Percentage of actual expense paid by the Company (in hundredths) | 20.00% |  |  |  | 20.00% |  |  |  | 20.00%
Percentage of reimbursable expenses recorded as non-interest expense (in hundredths) | 100.00% |  |  |  | 100.00% |  |  |  | 100.00%
[1] | For the three and nine months ended September 30, 2011, the reduction amounts of $43.3 million and $164.2 million, respectively, include charge-offs, of which $18.4 million and $92.8 million, respectively, of these charge-offs are recoverable from the FDIC and recorded in other assets. For the three and nine months ended September 30, 2010, the reduction amounts of $79.4 million and $287.4 million, respectively, also include charge-offs, of which $70.8 million and $188.8 million, respectively, is recoverable from the FDIC and recorded in other assets.
[2] | Reductions relate to cash flows received from principal amortization, partial prepayments, loan payoffs and loan sales.
[3] | This represents the change in the calculated estimate the company will be required to pay the FDIC at the end of the FDIC loss share agreements, due to lower thresholds of losses.

X
- Definition (Amortization) accretion related to the FDIC indemnification asset. + Details
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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

X
- 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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Data Type: | xbrli:monetaryItemType
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- Definition The change during the period in the calculated estimate the company will be required to pay the FDIC at the end of the FDIC loss share agreements. + Details
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Data Type: | xbrli:monetaryItemType
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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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- Details
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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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- Details
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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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- 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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- 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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