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FAIR VALUE MEASUREMENT AND FAIR VALUE OF FINANCIAL INSTRUMENTS (Details 6) (Fair Value, Measurements, Nonrecurring, USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Quantitative information    
OREO 1,676ewbc_OtherRealEstateOwnedFairValueDisclosure 17,521ewbc_OtherRealEstateOwnedFairValueDisclosure
Significant Unobservable Inputs (Level 3)
    
Quantitative information    
OREO 1,676ewbc_OtherRealEstateOwnedFairValueDisclosure
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OREO | Appraisal | Significant Unobservable Inputs (Level 3)
    
Quantitative information    
OREO 1,676ewbc_OtherRealEstateOwnedFairValueDisclosure
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OREO | Appraisal | Significant Unobservable Inputs (Level 3) | Weighted Average
    
Quantitative information    
Selling cost (as a percent) 8.00%ewbc_FairValueInputsSellingCost
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Loans Receivable | Non-PCI loans
    
Quantitative information    
Impaired loans 39,417us-gaap_LoansReceivableFairValueDisclosure
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Loans Receivable | Non-PCI loans | Significant Unobservable Inputs (Level 3)
    
Quantitative information    
Impaired loans 39,417us-gaap_LoansReceivableFairValueDisclosure
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Loans Receivable | Non-PCI loans | Discounted cash flow | Significant Unobservable Inputs (Level 3)
    
Quantitative information    
Impaired loans 3,578us-gaap_LoansReceivableFairValueDisclosure
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Loans Receivable | Non-PCI loans | Discounted cash flow | Significant Unobservable Inputs (Level 3) | Minimum
    
Quantitative information    
Discount rate (as a percent) 0.00%us-gaap_FairValueInputsDiscountRate
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Loans Receivable | Non-PCI loans | Discounted cash flow | Significant Unobservable Inputs (Level 3) | Maximum
    
Quantitative information    
Discount rate (as a percent) 86.00%us-gaap_FairValueInputsDiscountRate
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Loans Receivable | Non-PCI loans | Discounted cash flow | Significant Unobservable Inputs (Level 3) | Weighted Average
    
Quantitative information    
Discount rate (as a percent) 58.00%us-gaap_FairValueInputsDiscountRate
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Loans Receivable | Non-PCI loans | Market comparables | Significant Unobservable Inputs (Level 3)
    
Quantitative information    
Impaired loans 35,839us-gaap_LoansReceivableFairValueDisclosure
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Loans Receivable | Non-PCI loans | Market comparables | Significant Unobservable Inputs (Level 3) | Minimum
    
Quantitative information    
Discount rate (as a percent) 0.00%us-gaap_FairValueInputsDiscountRate
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Loans Receivable | Non-PCI loans | Market comparables | Significant Unobservable Inputs (Level 3) | Maximum
    
Quantitative information    
Discount rate (as a percent) 100.00%us-gaap_FairValueInputsDiscountRate
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Loans Receivable | Non-PCI loans | Market comparables | Significant Unobservable Inputs (Level 3) | Weighted Average
    
Quantitative information    
Discount rate (as a percent) 7.00%us-gaap_FairValueInputsDiscountRate
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[1] Discount rate is adjusted for factors such as liquidation cost of collateral and selling cost.