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DERIVATIVES (Details 5) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Counterparties assets |  |  |  |
Assets, Derivatives |  |  |  |
Gross Amounts of Recognized Assets | $ 12,396 us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_CounterpartyNameAxis = ewbc_CounterpartiesAssetsMember |  | $ 16,043 us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_CounterpartyNameAxis = ewbc_CounterpartiesAssetsMember |
Gross Amounts Offset On the Consolidated Balance Sheet | 0 us-gaap_DerivativeAssetFairValueGrossLiabilityAndObligationToReturnCashOffset / us-gaap_CounterpartyNameAxis = ewbc_CounterpartiesAssetsMember |  | 0 us-gaap_DerivativeAssetFairValueGrossLiabilityAndObligationToReturnCashOffset / us-gaap_CounterpartyNameAxis = ewbc_CounterpartiesAssetsMember |
Net Amounts of Assets Presented | 12,396 us-gaap_DerivativeAssets / us-gaap_CounterpartyNameAxis = ewbc_CounterpartiesAssetsMember |  | 16,043 us-gaap_DerivativeAssets / us-gaap_CounterpartyNameAxis = ewbc_CounterpartiesAssetsMember |
Gross Amounts Not Offset |  |  |  |
Financial Instruments | (5,725)us-gaap_DerivativeAssetNotOffsetPolicyElectionDeduction / us-gaap_CounterpartyNameAxis = ewbc_CounterpartiesAssetsMember | [1] | (11,363)us-gaap_DerivativeAssetNotOffsetPolicyElectionDeduction / us-gaap_CounterpartyNameAxis = ewbc_CounterpartiesAssetsMember | [1]
Collateral Received | (3,463)ewbc_DerivativeCollateralObligationToReturnCollateral / us-gaap_CounterpartyNameAxis = ewbc_CounterpartiesAssetsMember | [2] | (4,680)ewbc_DerivativeCollateralObligationToReturnCollateral / us-gaap_CounterpartyNameAxis = ewbc_CounterpartiesAssetsMember | [2]
Net Amount | 3,208 us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral / us-gaap_CounterpartyNameAxis = ewbc_CounterpartiesAssetsMember |  |  |
Counterparties liabilities |  |  |  |
Liabilities, Derivatives |  |  |  |
Gross Amounts of Recognized Liabilities | 56,505 us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_CounterpartyNameAxis = ewbc_CounterpartiesLiabilitiesMember |  | 33,849 us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_CounterpartyNameAxis = ewbc_CounterpartiesLiabilitiesMember |
Gross Amounts Offset On the Consolidated Balance Sheet | 0 us-gaap_DerivativeLiabilityFairValueGrossAssetAndRightToReclaimCashOffset / us-gaap_CounterpartyNameAxis = ewbc_CounterpartiesLiabilitiesMember |  | 0 us-gaap_DerivativeLiabilityFairValueGrossAssetAndRightToReclaimCashOffset / us-gaap_CounterpartyNameAxis = ewbc_CounterpartiesLiabilitiesMember |
Net Amounts of Liabilities Presented | 56,505 us-gaap_DerivativeLiabilities / us-gaap_CounterpartyNameAxis = ewbc_CounterpartiesLiabilitiesMember |  | 33,849 us-gaap_DerivativeLiabilities / us-gaap_CounterpartyNameAxis = ewbc_CounterpartiesLiabilitiesMember |
Gross Amounts Not Offset |  |  |  |
Financial Instruments | (5,725)us-gaap_DerivativeLiabilityNotOffsetPolicyElectionDeduction / us-gaap_CounterpartyNameAxis = ewbc_CounterpartiesLiabilitiesMember | [1] | (11,363)us-gaap_DerivativeLiabilityNotOffsetPolicyElectionDeduction / us-gaap_CounterpartyNameAxis = ewbc_CounterpartiesLiabilitiesMember | [1]
Collateral Posted | (49,951)ewbc_DerivativeCollateralRightToReclaimCollateral / us-gaap_CounterpartyNameAxis = ewbc_CounterpartiesLiabilitiesMember | [3] | (22,486)ewbc_DerivativeCollateralRightToReclaimCollateral / us-gaap_CounterpartyNameAxis = ewbc_CounterpartiesLiabilitiesMember | [3]
Net Amount | $ 829 us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral / us-gaap_CounterpartyNameAxis = ewbc_CounterpartiesLiabilitiesMember |  |  |
[1] | Represents the netting of derivative receivable and payable balance for the same counterparty under enforceable master netting arrangements if the Company has elected to net.
[2] | Represents cash and securities received against derivative assets with the same counterparty that are subject to enforceable master netting arrangements. Includes approximately $3.5 million of cash collateral received as of December 31, 2014.
[3] | Represents cash and securities pledged against derivative liabilities with the same counterparty th tare subject to enforceable master netting arrangements. Includes approximately $12.8 million and $187 thousand of cash collateral posted as of December 31, 2014 and December 31, 2013, respectively.

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