XML 83 R66.htm IDEA: XBRL DOCUMENT
v2.4.1.9

LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES (Details 7) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2015 | Mar. 31, 2014
Financing Receivable Allowance for Credit Losses Roll Forward |  |  |
Beginning balance | $ 261,679 us-gaap_FinancingReceivableAllowanceForCreditLosses |  |
(Reversal of) provision for loan losses | 4,987 us-gaap_ProvisionForLoanAndLeaseLosses |  | 6,933 us-gaap_ProvisionForLoanAndLeaseLosses
Ending balance | 257,738 us-gaap_FinancingReceivableAllowanceForCreditLosses |  |
Ending balance allocated to: |  |  |
Ending balance | 257,738 us-gaap_FinancingReceivableAllowanceForCreditLosses |  |
Loans Receivable |  |  |
Financing Receivable Allowance for Credit Losses Roll Forward |  |  |
Beginning balance | 261,679 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember | [1] | 249,675 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember
(Reversal of) provision for loan losses | 4,987 us-gaap_ProvisionForLoanAndLeaseLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember |  | 6,933 us-gaap_ProvisionForLoanAndLeaseLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember
Provision allocation for unfunded loan commitments and letters of credit | (2,920)ewbc_FinancingReceivableAllowanceForCreditLossesAllowanceForUnfundedLoanCommitmentsAndLettersOfCredit / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember |  | (215)ewbc_FinancingReceivableAllowanceForCreditLossesAllowanceForUnfundedLoanCommitmentsAndLettersOfCredit / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember
Charge-offs | (8,800)us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember |  | (6,136)us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember
Recoveries | 2,792 us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember |  | 1,879 us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember
Net recoveries (charge-offs) | (6,008)us-gaap_AllowanceForLoanAndLeaseLossesWriteoffsNet / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember |  | (4,257)us-gaap_AllowanceForLoanAndLeaseLossesWriteoffsNet / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember
Ending balance | 257,738 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember | [1] | 252,136 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember
Ending balance allocated to: |  |  |
Individually evaluated for impairment | 20,173 us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1 / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember |  | 26,718 us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1 / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember
Collectively evaluated for impairment | 236,922 us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember |  | 223,216 us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember
Acquired with deteriorated credit quality | 643 us-gaap_FinancingReceivableAllowanceForCreditLossesAcquiredWithDeterioratedCreditQuality / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember |  | 2,202 us-gaap_FinancingReceivableAllowanceForCreditLossesAcquiredWithDeterioratedCreditQuality / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember
Ending balance | 257,738 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember | [1] | 252,136 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember
Loans Receivable | Non-PCI loans |  |  |
Financing Receivable Allowance for Credit Losses Roll Forward |  |  |
Beginning balance | 260,965 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember |  | 247,406 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember
(Reversal of) provision for loan losses | 5,058 us-gaap_ProvisionForLoanAndLeaseLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember |  | 7,000 us-gaap_ProvisionForLoanAndLeaseLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember
Provision allocation for unfunded loan commitments and letters of credit | (2,920)ewbc_FinancingReceivableAllowanceForCreditLossesAllowanceForUnfundedLoanCommitmentsAndLettersOfCredit / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember |  | (215)ewbc_FinancingReceivableAllowanceForCreditLossesAllowanceForUnfundedLoanCommitmentsAndLettersOfCredit / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember
Charge-offs | (8,800)us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember |  | (6,136)us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember
Recoveries | 2,792 us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember |  | 1,879 us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember
Net recoveries (charge-offs) | (6,008)us-gaap_AllowanceForLoanAndLeaseLossesWriteoffsNet / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember |  | (4,257)us-gaap_AllowanceForLoanAndLeaseLossesWriteoffsNet / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember
Ending balance | 257,095 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember |  | 249,934 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember
Ending balance allocated to: |  |  |
Individually evaluated for impairment | 20,173 us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1 / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember |  | 26,718 us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1 / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember
Collectively evaluated for impairment | 236,922 us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember |  | 223,216 us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember
Ending balance | 257,095 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember |  | 249,934 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember
Loans Receivable | PCI loans |  |  |
Financing Receivable Allowance for Credit Losses Roll Forward |  |  |
Beginning balance | 714 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesAcquiredWithDeterioratedCreditQualityMember | [1] | 2,269 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesAcquiredWithDeterioratedCreditQualityMember
(Reversal of) provision for loan losses | (71)us-gaap_ProvisionForLoanAndLeaseLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesAcquiredWithDeterioratedCreditQualityMember |  | (67)us-gaap_ProvisionForLoanAndLeaseLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesAcquiredWithDeterioratedCreditQualityMember
Ending balance | 643 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesAcquiredWithDeterioratedCreditQualityMember | [1] | 2,202 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesAcquiredWithDeterioratedCreditQualityMember
Ending balance allocated to: |  |  |
Acquired with deteriorated credit quality | 643 us-gaap_FinancingReceivableAllowanceForCreditLossesAcquiredWithDeterioratedCreditQuality / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesAcquiredWithDeterioratedCreditQualityMember |  | 2,202 us-gaap_FinancingReceivableAllowanceForCreditLossesAcquiredWithDeterioratedCreditQuality / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesAcquiredWithDeterioratedCreditQualityMember
Ending balance | 643 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesAcquiredWithDeterioratedCreditQualityMember | [1] | 2,202 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesAcquiredWithDeterioratedCreditQualityMember
CRE | Loans Receivable | Non-PCI loans |  |  |
Financing Receivable Allowance for Credit Losses Roll Forward |  |  |
Beginning balance | 72,263 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember |  | 70,154 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember
(Reversal of) provision for loan losses | (2,333)us-gaap_ProvisionForLoanAndLeaseLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember |  | (7,036)us-gaap_ProvisionForLoanAndLeaseLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember
Charge-offs | (1,002)us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember |  | (319)us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember
Recoveries | 812 us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember |  | 828 us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember
Net recoveries (charge-offs) | (190)us-gaap_AllowanceForLoanAndLeaseLossesWriteoffsNet / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember |  | 509 us-gaap_AllowanceForLoanAndLeaseLossesWriteoffsNet / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember
Ending balance | 69,740 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember |  | 63,627 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember
Ending balance allocated to: |  |  |
Individually evaluated for impairment | 1,574 us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1 / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember |  | 8,375 us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1 / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember
Collectively evaluated for impairment | 68,166 us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember |  | 55,252 us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember
Ending balance | 69,740 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember |  | 63,627 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember
C&I | Loans Receivable | Non-PCI loans |  |  |
Financing Receivable Allowance for Credit Losses Roll Forward |  |  |
Beginning balance | 134,598 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialPortfolioSegmentMember |  | 115,184 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialPortfolioSegmentMember
(Reversal of) provision for loan losses | 5,378 us-gaap_ProvisionForLoanAndLeaseLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialPortfolioSegmentMember |  | 16,592 us-gaap_ProvisionForLoanAndLeaseLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialPortfolioSegmentMember
Charge-offs | (6,589)us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialPortfolioSegmentMember |  | (5,531)us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialPortfolioSegmentMember
Recoveries | 527 us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialPortfolioSegmentMember |  | 911 us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialPortfolioSegmentMember
Net recoveries (charge-offs) | (6,062)us-gaap_AllowanceForLoanAndLeaseLossesWriteoffsNet / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialPortfolioSegmentMember |  | (4,620)us-gaap_AllowanceForLoanAndLeaseLossesWriteoffsNet / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialPortfolioSegmentMember
Ending balance | 133,914 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialPortfolioSegmentMember |  | 127,156 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialPortfolioSegmentMember
Ending balance allocated to: |  |  |
Individually evaluated for impairment | 17,906 us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1 / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialPortfolioSegmentMember |  | 16,490 us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1 / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialPortfolioSegmentMember
Collectively evaluated for impairment | 116,008 us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialPortfolioSegmentMember |  | 110,666 us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialPortfolioSegmentMember
Ending balance | 133,914 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialPortfolioSegmentMember |  | 127,156 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_CommercialPortfolioSegmentMember
Residential | Loans Receivable | Non-PCI loans |  |  |
Financing Receivable Allowance for Credit Losses Roll Forward |  |  |
Beginning balance | 43,856 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ResidentialPortfolioSegmentMember |  | 50,716 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ResidentialPortfolioSegmentMember
(Reversal of) provision for loan losses | (1,571)us-gaap_ProvisionForLoanAndLeaseLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ResidentialPortfolioSegmentMember |  | (2,575)us-gaap_ProvisionForLoanAndLeaseLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ResidentialPortfolioSegmentMember
Charge-offs | (746)us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ResidentialPortfolioSegmentMember |  | (283)us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ResidentialPortfolioSegmentMember
Recoveries | 1,451 us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ResidentialPortfolioSegmentMember |  | 137 us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ResidentialPortfolioSegmentMember
Net recoveries (charge-offs) | 705 us-gaap_AllowanceForLoanAndLeaseLossesWriteoffsNet / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ResidentialPortfolioSegmentMember |  | (146)us-gaap_AllowanceForLoanAndLeaseLossesWriteoffsNet / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ResidentialPortfolioSegmentMember
Ending balance | 42,990 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ResidentialPortfolioSegmentMember |  | 47,995 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ResidentialPortfolioSegmentMember
Ending balance allocated to: |  |  |
Individually evaluated for impairment | 692 us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1 / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ResidentialPortfolioSegmentMember |  | 1,853 us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1 / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ResidentialPortfolioSegmentMember
Collectively evaluated for impairment | 42,298 us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ResidentialPortfolioSegmentMember |  | 46,142 us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ResidentialPortfolioSegmentMember
Ending balance | 42,990 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ResidentialPortfolioSegmentMember |  | 47,995 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ResidentialPortfolioSegmentMember
Consumer | Loans Receivable | Non-PCI loans |  |  |
Financing Receivable Allowance for Credit Losses Roll Forward |  |  |
Beginning balance | 10,248 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ConsumerPortfolioSegmentMember |  | 11,352 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ConsumerPortfolioSegmentMember
(Reversal of) provision for loan losses | 664 us-gaap_ProvisionForLoanAndLeaseLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ConsumerPortfolioSegmentMember |  | (196)us-gaap_ProvisionForLoanAndLeaseLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ConsumerPortfolioSegmentMember
Charge-offs | (463)us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ConsumerPortfolioSegmentMember |  | (3)us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ConsumerPortfolioSegmentMember
Recoveries | 2 us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ConsumerPortfolioSegmentMember |  | 3 us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ConsumerPortfolioSegmentMember
Net recoveries (charge-offs) | (461)us-gaap_AllowanceForLoanAndLeaseLossesWriteoffsNet / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ConsumerPortfolioSegmentMember |  |
Ending balance | 10,451 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ConsumerPortfolioSegmentMember |  | 11,156 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ConsumerPortfolioSegmentMember
Ending balance allocated to: |  |  |
Individually evaluated for impairment | 1 us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1 / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ConsumerPortfolioSegmentMember |  |
Collectively evaluated for impairment | 10,450 us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ConsumerPortfolioSegmentMember |  | 11,156 us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ConsumerPortfolioSegmentMember
Ending balance | 10,451 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ConsumerPortfolioSegmentMember |  | 11,156 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_ConsumerPortfolioSegmentMember
Unallocated | Loans Receivable | Non-PCI loans |  |  |
Financing Receivable Allowance for Credit Losses Roll Forward |  |  |
(Reversal of) provision for loan losses | 2,920 us-gaap_ProvisionForLoanAndLeaseLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_UnallocatedFinancingReceivablesMember |  | 215 us-gaap_ProvisionForLoanAndLeaseLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_UnallocatedFinancingReceivablesMember
Provision allocation for unfunded loan commitments and letters of credit | $ (2,920)ewbc_FinancingReceivableAllowanceForCreditLossesAllowanceForUnfundedLoanCommitmentsAndLettersOfCredit / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_UnallocatedFinancingReceivablesMember |  | $ (215)ewbc_FinancingReceivableAllowanceForCreditLossesAllowanceForUnfundedLoanCommitmentsAndLettersOfCredit / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember / ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis = us-gaap_UnallocatedFinancingReceivablesMember
[1] | Loans net of ASC 310-30 discount.

X
- Definition Reflects the amount charged against earnings during the period as credit losses (bad debt expense) for unfunded loan commitments and letters of credit during the period. + References No definition available. + Details
Name: | ewbc_FinancingReceivableAllowanceForCreditLossesAllowanceForUnfundedLoanCommitmentsAndLettersOfCredit
Namespace Prefix: | ewbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount, after recoveries, of loans and leases that have been written-off. + References No definition available. + Details
Name: | us-gaap_AllowanceForLoanAndLeaseLossesWriteoffsNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of recovery of loans and lease receivables which had previously been fully or partially written-off as bad debts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(4) -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524 + Details
Name: | us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | us-gaap_FinancingReceivableAllowanceForCreditLossAdditionalInformationAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition A valuation allowance for financing receivables that are expected to be uncollectible. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524 + Details
Name: | us-gaap_FinancingReceivableAllowanceForCreditLosses
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The valuation allowance for financing receivables acquired with deteriorated credit quality. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524 + Details
Name: | us-gaap_FinancingReceivableAllowanceForCreditLossesAcquiredWithDeterioratedCreditQuality
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524 + Details
Name: | us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524 + Details
Name: | us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_FinancingReceivableAllowanceForCreditLossesRollForward
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of direct write-downs of financing receivables charged against the allowance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524 + Details
Name: | us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of expense related to estimated loss from loan and lease transactions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 11 -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.11) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524 + Details
Name: | us-gaap_ProvisionForLoanAndLeaseLosses
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis=us-gaap_CommercialPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis=us-gaap_CommercialRealEstatePortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis=us-gaap_ConsumerPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis=us-gaap_ResidentialPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ewbc_FinancingReceivableInformationByPortfolioSegmentsAxis=us-gaap_UnallocatedFinancingReceivablesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis=us-gaap_LoansReceivableMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |