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FAIR VALUE MEASUREMENT AND FAIR VALUE OF FINANCIAL INSTRUMENTS (Details 3) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Quantitative information    
Available-for-sale investment securities 2,841,085us-gaap_AvailableForSaleSecurities 2,626,365us-gaap_AvailableForSaleSecurities
Corporate debt securities | Non-investment grade    
Quantitative information    
Available-for-sale investment securities 9,501us-gaap_AvailableForSaleSecurities
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Fair Value, Measurements, Recurring    
Quantitative information    
Available-for-sale investment securities 2,841,085us-gaap_AvailableForSaleSecurities
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Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3)    
Quantitative information    
Available-for-sale investment securities   6,528us-gaap_AvailableForSaleSecurities
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Fair Value, Measurements, Recurring | Embedded derivative liabilities | Discounted cash flow | Significant Unobservable Inputs (Level 3)    
Quantitative information    
Derivative liabilities (3,412)us-gaap_DerivativeLiabilities
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Fair Value, Measurements, Recurring | Embedded derivative liabilities | Discounted cash flow | Significant Unobservable Inputs (Level 3) | Minimum    
Quantitative information    
Credit risk 0.03%ewbc_FairValueInputsCreditRiskAdjustmentRate
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Fair Value, Measurements, Recurring | Embedded derivative liabilities | Discounted cash flow | Significant Unobservable Inputs (Level 3) | Maximum    
Quantitative information    
Credit risk 0.07%ewbc_FairValueInputsCreditRiskAdjustmentRate
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Fair Value, Measurements, Recurring | Embedded derivative liabilities | Discounted cash flow | Significant Unobservable Inputs (Level 3) | Weighted Average    
Quantitative information    
Credit risk 0.06%ewbc_FairValueInputsCreditRiskAdjustmentRate
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Fair Value, Measurements, Recurring | Corporate debt securities | Non-investment grade    
Quantitative information    
Available-for-sale investment securities 9,501us-gaap_AvailableForSaleSecurities
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Fair Value, Measurements, Recurring | Corporate debt securities | Non-investment grade | Significant Unobservable Inputs (Level 3)    
Quantitative information    
Available-for-sale investment securities   6,528us-gaap_AvailableForSaleSecurities
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Fair Value, Measurements, Recurring | Corporate debt securities | Non-investment grade | Discounted cash flow | Significant Unobservable Inputs (Level 3)    
Quantitative information    
Available-for-sale investment securities   6,528us-gaap_AvailableForSaleSecurities
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Fair Value, Measurements, Recurring | Corporate debt securities | Non-investment grade | Discounted cash flow | Significant Unobservable Inputs (Level 3) | Minimum    
Quantitative information    
Constant prepayment rate   0.00%us-gaap_FairValueInputsPrepaymentRate
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Constant default rate   0.75%us-gaap_FairValueInputsProbabilityOfDefault
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Discount margin   4.50%us-gaap_FairValueInputsDiscountRate
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Fair Value, Measurements, Recurring | Corporate debt securities | Non-investment grade | Discounted cash flow | Significant Unobservable Inputs (Level 3) | Maximum    
Quantitative information    
Constant prepayment rate   1.00%us-gaap_FairValueInputsPrepaymentRate
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Constant default rate   1.20%us-gaap_FairValueInputsProbabilityOfDefault
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Discount margin   7.50%us-gaap_FairValueInputsDiscountRate
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Fair Value, Measurements, Recurring | Corporate debt securities | Non-investment grade | Discounted cash flow | Significant Unobservable Inputs (Level 3) | Weighted Average    
Quantitative information    
Constant prepayment rate   0.73%us-gaap_FairValueInputsPrepaymentRate
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Constant default rate   0.87%us-gaap_FairValueInputsProbabilityOfDefault
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Loss severity   85.00%us-gaap_FairValueInputsLossSeverity
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Discount margin   6.94%us-gaap_FairValueInputsDiscountRate
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[1] Available-for-sale investment securities rated BBB- or higher by S&P or Baa3 or higher by Moody's are considered investment grade. Conversely, available-for-sale investment securities rated lower than BBB- by S&P or lower than Baa3 by Moody's are considered non-investment grade.