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COVERED ASSETS AND FDIC INDEMNIFICATION ASSET (Details 2) (USD $) | Dec. 31, 2011 | Dec. 31, 2010
--- | --- | ---
Credit Quality Indicators |  |
Additional advances under shared-loss agreements | $ 583,800,000 |
Total allowance allocated to additional advances | 6,600,000 |
Percentage of allowance allocated to additional advances | 3.10% |
Carrying Amounts And Composition Of Covered Loans |  |
Total principal balance | 4,718,084,000 | 5,955,773,000
Covered discount | (788,295,000) | (1,150,672,000)
Net valuation of loans | 3,929,789,000 | 4,805,101,000
Allowance on covered loans | (6,647,000) | (4,225,000)
Total covered loans, net | 3,923,142,000 | 4,800,876,000
Pass/Watch |  |
Carrying Amounts And Composition Of Covered Loans |  |
Total principal balance | 3,439,848,000 | 4,323,086,000
Special Mention |  |
Carrying Amounts And Composition Of Covered Loans |  |
Total principal balance | 146,585,000 | 297,863,000
Substandard |  |
Carrying Amounts And Composition Of Covered Loans |  |
Total principal balance | 1,112,568,000 | 1,277,504,000
Doubtful |  |
Carrying Amounts And Composition Of Covered Loans |  |
Total principal balance | 19,083,000 | 57,320,000
Real Estate Loans |  |
Carrying Amounts And Composition Of Covered Loans |  |
Total principal balance | 3,788,478,000 | 4,776,263,000
Real Estate Loans | Pass/Watch |  |
Carrying Amounts And Composition Of Covered Loans |  |
Total principal balance | 2,700,389,000 | 3,382,602,000
Real Estate Loans | Special Mention |  |
Carrying Amounts And Composition Of Covered Loans |  |
Total principal balance | 111,878,000 | 232,825,000
Real Estate Loans | Substandard |  |
Carrying Amounts And Composition Of Covered Loans |  |
Total principal balance | 961,813,000 | 1,115,181,000
Real Estate Loans | Doubtful |  |
Carrying Amounts And Composition Of Covered Loans |  |
Total principal balance | 14,398,000 | 45,655,000
Real Estate Loans | Residential Single-family |  |
Carrying Amounts And Composition Of Covered Loans |  |
Total principal balance | 442,732,000 | 553,541,000
Real Estate Loans | Residential Single-family | Pass/Watch |  |
Carrying Amounts And Composition Of Covered Loans |  |
Total principal balance | 427,918,000 | 525,979,000
Real Estate Loans | Residential Single-family | Special Mention |  |
Carrying Amounts And Composition Of Covered Loans |  |
Total principal balance | 1,085,000 | 2,153,000
Real Estate Loans | Residential Single-family | Substandard |  |
Carrying Amounts And Composition Of Covered Loans |  |
Total principal balance | 13,729,000 | 25,157,000
Real Estate Loans | Residential Single-family | Doubtful |  |
Carrying Amounts And Composition Of Covered Loans |  |
Total principal balance |  | 252,000
Real Estate Loans | Residential Multifamily |  |
Carrying Amounts And Composition Of Covered Loans |  |
Total principal balance | 918,941,000 | 1,093,331,000
Real Estate Loans | Residential Multifamily | Pass/Watch |  |
Carrying Amounts And Composition Of Covered Loans |  |
Total principal balance | 779,694,000 | 1,008,274,000
Real Estate Loans | Residential Multifamily | Special Mention |  |
Carrying Amounts And Composition Of Covered Loans |  |
Total principal balance | 26,124,000 | 15,114,000
Real Estate Loans | Residential Multifamily | Substandard |  |
Carrying Amounts And Composition Of Covered Loans |  |
Total principal balance | 113,123,000 | 67,366,000
Real Estate Loans | Residential Multifamily | Doubtful |  |
Carrying Amounts And Composition Of Covered Loans |  |
Total principal balance |  | 2,577,000
Real Estate Loans | Commercial and Industrial Real Estate |  |
Carrying Amounts And Composition Of Covered Loans |  |
Total principal balance | 1,773,760,000 | 2,085,674,000
Real Estate Loans | Commercial and Industrial Real Estate | Pass/Watch |  |
Carrying Amounts And Composition Of Covered Loans |  |
Total principal balance | 1,249,781,000 | 1,520,135,000
Real Estate Loans | Commercial and Industrial Real Estate | Special Mention |  |
Carrying Amounts And Composition Of Covered Loans |  |
Total principal balance | 43,810,000 | 89,870,000
Real Estate Loans | Commercial and Industrial Real Estate | Substandard |  |
Carrying Amounts And Composition Of Covered Loans |  |
Total principal balance | 472,003,000 | 466,588,000
Real Estate Loans | Commercial and Industrial Real Estate | Doubtful |  |
Carrying Amounts And Composition Of Covered Loans |  |
Total principal balance | 8,166,000 | 9,081,000
Real Estate Loans | Construction and Land |  |
Carrying Amounts And Composition Of Covered Loans |  |
Total principal balance | 653,045,000 | 1,043,717,000
Real Estate Loans | Construction and Land | Pass/Watch |  |
Carrying Amounts And Composition Of Covered Loans |  |
Total principal balance | 242,996,000 | 328,214,000
Real Estate Loans | Construction and Land | Special Mention |  |
Carrying Amounts And Composition Of Covered Loans |  |
Total principal balance | 40,859,000 | 125,688,000
Real Estate Loans | Construction and Land | Substandard |  |
Carrying Amounts And Composition Of Covered Loans |  |
Total principal balance | 362,958,000 | 556,070,000
Real Estate Loans | Construction and Land | Doubtful |  |
Carrying Amounts And Composition Of Covered Loans |  |
Total principal balance | 6,232,000 | 33,745,000
Other Loans |  |
Carrying Amounts And Composition Of Covered Loans |  |
Total principal balance | 929,606,000 | 1,179,510,000
Other Loans | Pass/Watch |  |
Carrying Amounts And Composition Of Covered Loans |  |
Total principal balance | 739,459,000 | 940,484,000
Other Loans | Special Mention |  |
Carrying Amounts And Composition Of Covered Loans |  |
Total principal balance | 34,707,000 | 65,038,000
Other Loans | Substandard |  |
Carrying Amounts And Composition Of Covered Loans |  |
Total principal balance | 150,755,000 | 162,323,000
Other Loans | Doubtful |  |
Carrying Amounts And Composition Of Covered Loans |  |
Total principal balance | 4,685,000 | 11,665,000
Other Loans | Commercial Business |  |
Carrying Amounts And Composition Of Covered Loans |  |
Total principal balance | 831,762,000 | 1,072,020,000
Other Loans | Commercial Business | Pass/Watch |  |
Carrying Amounts And Composition Of Covered Loans |  |
Total principal balance | 643,117,000 | 834,252,000
Other Loans | Commercial Business | Special Mention |  |
Carrying Amounts And Composition Of Covered Loans |  |
Total principal balance | 34,707,000 | 64,702,000
Other Loans | Commercial Business | Substandard |  |
Carrying Amounts And Composition Of Covered Loans |  |
Total principal balance | 149,253,000 | 161,401,000
Other Loans | Commercial Business | Doubtful |  |
Carrying Amounts And Composition Of Covered Loans |  |
Total principal balance | 4,685,000 | 11,665,000
Other Loans | Other Consumer |  |
Carrying Amounts And Composition Of Covered Loans |  |
Total principal balance | 97,844,000 | 107,490,000
Other Loans | Other Consumer | Pass/Watch |  |
Carrying Amounts And Composition Of Covered Loans |  |
Total principal balance | 96,342,000 | 106,232,000
Other Loans | Other Consumer | Special Mention |  |
Carrying Amounts And Composition Of Covered Loans |  |
Total principal balance |  | 336,000
Other Loans | Other Consumer | Substandard |  |
Carrying Amounts And Composition Of Covered Loans |  |
Total principal balance | 1,502,000 | 922,000
Residential |  |
Credit Quality Indicators |  |
Additional advances under shared-loss agreements | 12,700,000 |
Total allowance allocated to additional advances | 70,000 |
Commercial Real Estate ("CRE") |  |
Credit Quality Indicators |  |
Additional advances under shared-loss agreements | 149,100,000 |
Total allowance allocated to additional advances | 4,000,000 |
Commercial and Industrial ("C&I") |  |
Credit Quality Indicators |  |
Additional advances under shared-loss agreements | 390,300,000 |
Total allowance allocated to additional advances | 2,400,000 |
Consumer |  |
Credit Quality Indicators |  |
Additional advances under shared-loss agreements | 31,600,000 |
Total allowance allocated to additional advances | $ 174,000 |

X
- Definition Additional advances on covered loans included in covered loans under the shared-loss agreements but not accounted for under ASU 310-30. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of allowance allocated to additional advances included in covered loans shared-loss agreements. Allowance on covered loans represents the reserve to cover probable credit losses related to specifically identified loans (loans covered by shared loss agreements), as of the balance sheet date. + References No definition available. + Details
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Balance Type: | credit
Period Type: | instant

X
- Definition The allowance for loan losses represents the reserve to cover probable credit losses related to specifically identified loans (loans covered by shared loss agreements), as of the balance sheet date. + References No definition available. + Details
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- Definition The discount amount related to covered loans receivable as of the balance sheet date. + References No definition available. + Details
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Namespace Prefix: | ewbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Net loans covered by FDIC's loss share agreements. + References No definition available. + Details
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- Details
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- Definition For an unclassified balance sheet, an amount representing an agreement for an unconditional promise by the maker to pay the Entity (holder) a definite sum of money at a future date, before any write-downs taken for collection uncertainty on the part of the holder, for loans covered under shared loss agreements. + References No definition available. + Details
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- Definition The carrying amount as of the balance sheet date of covered loans receivable, net of discounts. + References No definition available. + Details
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- Definition Percentage of allowance allocated to additional advances included in covered loans shared-loss agreements over the total amount of allowance on covered loans. Allowance on covered loans represents the reserve to cover probable credit losses related to specifically identified loans (loans covered by shared loss agreements), as of the balance sheet date. + References No definition available. + Details
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