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NON-COVERED LOANS AND ALLOWANCE FOR LOAN LOSSES (Details 15) (Non-covered loans, MetroCorp, USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Non-covered loans | MetroCorp
 
Changes in the accretable yield for the PCI loans  
Additions $ 6,745us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldAdditions
/ us-gaap_BusinessAcquisitionAxis
= ewbc_MetroCorpMember
/ ewbc_ReceivableByIndemnificationStatusAxis
= ewbc_NonCoveredLoansMember
Accretion (4,960)us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldAccretion
/ us-gaap_BusinessAcquisitionAxis
= ewbc_MetroCorpMember
/ ewbc_ReceivableByIndemnificationStatusAxis
= ewbc_NonCoveredLoansMember
Changes in expected cash flows 3,379ewbc_ChangesInExpectedCashFlows
/ us-gaap_BusinessAcquisitionAxis
= ewbc_MetroCorpMember
/ ewbc_ReceivableByIndemnificationStatusAxis
= ewbc_NonCoveredLoansMember
Ending Balance $ 5,164us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield
/ us-gaap_BusinessAcquisitionAxis
= ewbc_MetroCorpMember
/ ewbc_ReceivableByIndemnificationStatusAxis
= ewbc_NonCoveredLoansMember