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FAIR VALUE MEASUREMENT AND FAIR VALUE OF FINANCIAL INSTRUMENTS (Details 7) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
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Financial Assets: |  |  |  |  |
Cash and cash equivalents | $ 1,039,885 us-gaap_CashAndCashEquivalentsAtCarryingValue | $ 895,820 us-gaap_CashAndCashEquivalentsAtCarryingValue |  | $ 1,323,106 us-gaap_CashAndCashEquivalentsAtCarryingValue | $ 1,431,185 us-gaap_CashAndCashEquivalentsAtCarryingValue
Short-term Investments | 338,714 us-gaap_ShortTermInvestments | 257,473 us-gaap_ShortTermInvestments |  |  |
Securities purchased under resale agreements | 1,225,000 us-gaap_SecuritiesPurchasedUnderAgreementsToResell | 1,300,000 us-gaap_SecuritiesPurchasedUnderAgreementsToResell | [1] |  |
Loans held for sale | 45,950 us-gaap_LoansReceivableHeldForSaleNet | 204,970 us-gaap_LoansReceivableHeldForSaleNet |  |  |
Loans receivable, net | 21,468,270 us-gaap_LoansAndLeasesReceivableNetReportedAmountCoveredAndNotCovered | 17,600,613 us-gaap_LoansAndLeasesReceivableNetReportedAmountCoveredAndNotCovered |  |  |
Investment in Federal Home Loan Bank stock | 31,239 us-gaap_FederalHomeLoanBankStock | 62,330 us-gaap_FederalHomeLoanBankStock |  |  |
Investment in Federal Reserve Bank stock | 54,451 us-gaap_FederalReserveBankStock | 48,333 us-gaap_FederalReserveBankStock |  |  |
Financial Liabilities: |  |  |  |  |
Demand, savings and money market deposits | 17,896,035 ewbc_CoreDeposits | 14,588,570 ewbc_CoreDeposits |  |  |
Time Deposits | 6,112,739 us-gaap_TimeDeposits | 5,824,348 us-gaap_TimeDeposits |  |  |
Federal Home Loan Bank advances | 317,241 us-gaap_FederalHomeLoanBankAdvancesLongTerm | 315,092 us-gaap_FederalHomeLoanBankAdvancesLongTerm |  |  |
Securities sold under repurchase agreements | 795,000 us-gaap_SecuritiesSoldUnderAgreementsToRepurchase | 995,000 us-gaap_SecuritiesSoldUnderAgreementsToRepurchase |  |  |
Long-term debt | 225,848 us-gaap_LongTermDebt | 226,868 us-gaap_LongTermDebt |  |  |
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |  |  |
Financial Assets: |  |  |  |  |
Cash and cash equivalents | 1,039,885 us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 895,820 us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member |  |  |
Significant Other Observable Inputs (Level 2) |  |  |  |  |
Financial Assets: |  |  |  |  |
Short-term Investments | 338,714 us-gaap_ShortTermInvestments / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 257,473 us-gaap_ShortTermInvestments / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member |  |  |
Securities purchased under resale agreements | 1,191,060 us-gaap_SecuritiesPurchasedUnderAgreementsToResell / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 1,279,406 us-gaap_SecuritiesPurchasedUnderAgreementsToResell / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member |  |  |
Loans held for sale | 45,950 us-gaap_LoansReceivableHeldForSaleNet / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 212,469 us-gaap_LoansReceivableHeldForSaleNet / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member |  |  |
Investment in Federal Home Loan Bank stock | 31,239 us-gaap_FederalHomeLoanBankStock / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 62,330 us-gaap_FederalHomeLoanBankStock / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member |  |  |
Investment in Federal Reserve Bank stock | 54,451 us-gaap_FederalReserveBankStock / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 48,333 us-gaap_FederalReserveBankStock / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member |  |  |
Accrued interest receivable | 88,303 us-gaap_InterestReceivable / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 116,314 us-gaap_InterestReceivable / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member |  |  |
Financial Liabilities: |  |  |  |  |
Demand, savings and money market deposits | 17,896,035 ewbc_CoreDeposits / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 14,588,570 ewbc_CoreDeposits / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member |  |  |
Federal Home Loan Bank advances | 336,302 us-gaap_FederalHomeLoanBankAdvancesLongTerm / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 308,521 us-gaap_FederalHomeLoanBankAdvancesLongTerm / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member |  |  |
Securities sold under repurchase agreements | 870,434 us-gaap_SecuritiesSoldUnderAgreementsToRepurchase / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 1,134,774 us-gaap_SecuritiesSoldUnderAgreementsToRepurchase / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member |  |  |
Accrued interest payable | 11,303 us-gaap_InterestPayableCurrentAndNoncurrent / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 11,178 us-gaap_InterestPayableCurrentAndNoncurrent / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member |  |  |
Long-term debt | 205,777 us-gaap_LongTermDebt / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 184,415 us-gaap_LongTermDebt / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member |  |  |
Significant Unobservable Inputs (Level 3) |  |  |  |  |
Financial Assets: |  |  |  |  |
Loans receivable, net | 20,997,379 us-gaap_LoansAndLeasesReceivableNetReportedAmountCoveredAndNotCovered / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | 16,741,674 us-gaap_LoansAndLeasesReceivableNetReportedAmountCoveredAndNotCovered / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member |  |  |
Financial Liabilities: |  |  |  |  |
Time Deposits | 6,095,217 us-gaap_TimeDeposits / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | 5,791,659 us-gaap_TimeDeposits / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member |  |  |
Carrying Amount |  |  |  |  |
Financial Assets: |  |  |  |  |
Cash and cash equivalents | 1,039,885 us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember | 895,820 us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember |  |  |
Short-term Investments | 338,714 us-gaap_ShortTermInvestments / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember | 257,473 us-gaap_ShortTermInvestments / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember |  |  |
Securities purchased under resale agreements | 1,225,000 us-gaap_SecuritiesPurchasedUnderAgreementsToResell / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember | 1,300,000 us-gaap_SecuritiesPurchasedUnderAgreementsToResell / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember |  |  |
Loans held for sale | 45,950 us-gaap_LoansReceivableHeldForSaleNet / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember | 204,970 us-gaap_LoansReceivableHeldForSaleNet / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember |  |  |
Loans receivable, net | 21,468,270 us-gaap_LoansAndLeasesReceivableNetReportedAmountCoveredAndNotCovered / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember | 17,600,613 us-gaap_LoansAndLeasesReceivableNetReportedAmountCoveredAndNotCovered / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember |  |  |
Investment in Federal Home Loan Bank stock | 31,239 us-gaap_FederalHomeLoanBankStock / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember | 62,330 us-gaap_FederalHomeLoanBankStock / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember |  |  |
Investment in Federal Reserve Bank stock | 54,451 us-gaap_FederalReserveBankStock / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember | 48,333 us-gaap_FederalReserveBankStock / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember |  |  |
Accrued interest receivable | 88,303 us-gaap_InterestReceivable / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember | 116,314 us-gaap_InterestReceivable / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember |  |  |
Financial Liabilities: |  |  |  |  |
Demand, savings and money market deposits | 17,896,035 ewbc_CoreDeposits / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember | 14,588,570 ewbc_CoreDeposits / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember |  |  |
Time Deposits | 6,112,739 us-gaap_TimeDeposits / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember | 5,824,348 us-gaap_TimeDeposits / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember |  |  |
Federal Home Loan Bank advances | 317,241 us-gaap_FederalHomeLoanBankAdvancesLongTerm / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember | 315,092 us-gaap_FederalHomeLoanBankAdvancesLongTerm / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember |  |  |
Securities sold under repurchase agreements | 795,000 us-gaap_SecuritiesSoldUnderAgreementsToRepurchase / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember | 995,000 us-gaap_SecuritiesSoldUnderAgreementsToRepurchase / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember |  |  |
Accrued interest payable | 11,303 us-gaap_InterestPayableCurrentAndNoncurrent / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember | 11,178 us-gaap_InterestPayableCurrentAndNoncurrent / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember |  |  |
Long-term debt | 225,848 us-gaap_LongTermDebt / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember | 226,868 us-gaap_LongTermDebt / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember |  |  |
Fair Value Measurements |  |  |  |  |
Financial Assets: |  |  |  |  |
Cash and cash equivalents | 1,039,885 us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember | 895,820 us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember |  |  |
Short-term Investments | 338,714 us-gaap_ShortTermInvestments / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember | 257,473 us-gaap_ShortTermInvestments / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember |  |  |
Securities purchased under resale agreements | 1,191,060 us-gaap_SecuritiesPurchasedUnderAgreementsToResell / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember | 1,279,406 us-gaap_SecuritiesPurchasedUnderAgreementsToResell / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember |  |  |
Loans held for sale | 45,950 us-gaap_LoansReceivableHeldForSaleNet / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember | 212,469 us-gaap_LoansReceivableHeldForSaleNet / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember |  |  |
Loans receivable, net | 20,997,379 us-gaap_LoansAndLeasesReceivableNetReportedAmountCoveredAndNotCovered / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember | 16,741,674 us-gaap_LoansAndLeasesReceivableNetReportedAmountCoveredAndNotCovered / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember |  |  |
Investment in Federal Home Loan Bank stock | 31,239 us-gaap_FederalHomeLoanBankStock / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember | 62,330 us-gaap_FederalHomeLoanBankStock / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember |  |  |
Investment in Federal Reserve Bank stock | 54,451 us-gaap_FederalReserveBankStock / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember | 48,333 us-gaap_FederalReserveBankStock / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember |  |  |
Accrued interest receivable | 88,303 us-gaap_InterestReceivable / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember | 116,314 us-gaap_InterestReceivable / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember |  |  |
Financial Liabilities: |  |  |  |  |
Demand, savings and money market deposits | 17,896,035 ewbc_CoreDeposits / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember | 14,588,570 ewbc_CoreDeposits / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember |  |  |
Time Deposits | 6,095,217 us-gaap_TimeDeposits / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember | 5,791,659 us-gaap_TimeDeposits / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember |  |  |
Federal Home Loan Bank advances | 336,302 us-gaap_FederalHomeLoanBankAdvancesLongTerm / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember | 308,521 us-gaap_FederalHomeLoanBankAdvancesLongTerm / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember |  |  |
Securities sold under repurchase agreements | 870,434 us-gaap_SecuritiesSoldUnderAgreementsToRepurchase / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember | 1,134,774 us-gaap_SecuritiesSoldUnderAgreementsToRepurchase / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember |  |  |
Accrued interest payable | 11,303 us-gaap_InterestPayableCurrentAndNoncurrent / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember | 11,178 us-gaap_InterestPayableCurrentAndNoncurrent / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember |  |  |
Long-term debt | $ 205,777 us-gaap_LongTermDebt / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember | $ 184,415 us-gaap_LongTermDebt / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember |  |  |
[1] | Of the $1.40 billion resale agreements as of December 31, 2013, $100.0 million was recorded in cash and cash equivalents and $1.3 billion was recorded in securities under resale agreements in the consolidated balance sheet.

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