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v2.4.1.9

LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES (Details 9) (USD $) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Dec. 31, 2014
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |
Net payable to the FDIC | $ 101,400,000 ewbc_FdicIndemnificationLiability |  |  |  |
Net FDIC indemnification asset |  |  | 27,600,000 us-gaap_FDICIndemnificationAsset |  |
FDIC indemnification asset/(Payable to FDIC, net) |  |  |  |  |
Beginning balance | (96,106,000)ewbc_FdicIndemnificationAssetLiabilities |  | 74,708,000 ewbc_FdicIndemnificationAssetLiabilities |  |
Amortization | (1,542,000)ewbc_FdicIndemnificationAccretionAmortizationOfDiscountPremium |  | (28,490,000)ewbc_FdicIndemnificationAccretionAmortizationOfDiscountPremium |  |
Reductions | (649,000)ewbc_FdicIndemnificationAssetReductions | [1] | (11,842,000)ewbc_FdicIndemnificationAssetReductions | [1] |
Estimate of FDIC repayment | (3,114,000)ewbc_FdicRepayments | [2] | (6,824,000)ewbc_FdicRepayments | [2] |
Ending Balance | (101,411,000)ewbc_FdicIndemnificationAssetLiabilities |  | 27,552,000 ewbc_FdicIndemnificationAssetLiabilities |  |
Loans Receivable |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |
Loans covered under shared-loss agreements | 354,400,000 us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember |  |  |  | 1,480,000,000 us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember
Loans Receivable | PCI loans |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |
Loans covered under shared-loss agreements | 311,600,000 us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesAcquiredWithDeterioratedCreditQualityMember |  |  |  | 1,230,000,000 us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesAcquiredWithDeterioratedCreditQualityMember
Changes in the accretable yield for the PCI loans |  |  |  |  |
Beginning balance | 311,688,000 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesAcquiredWithDeterioratedCreditQualityMember |  | 461,545,000 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesAcquiredWithDeterioratedCreditQualityMember |  |
Additions |  |  | 6,745,000 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldAdditions / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesAcquiredWithDeterioratedCreditQualityMember |  |
Accretion | (30,569,000)us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldAccretion / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesAcquiredWithDeterioratedCreditQualityMember |  | (61,946,000)us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldAccretion / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesAcquiredWithDeterioratedCreditQualityMember |  |
Changes in expected cash flows | 12,036,000 ewbc_ChangesInExpectedCashFlows / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesAcquiredWithDeterioratedCreditQualityMember |  | 24,112,000 ewbc_ChangesInExpectedCashFlows / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesAcquiredWithDeterioratedCreditQualityMember |  |
Ending Balance | 293,155,000 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesAcquiredWithDeterioratedCreditQualityMember |  | 430,456,000 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FairValueByAssetClassAxis = ewbc_ReceivablesAcquiredWithDeterioratedCreditQualityMember |  |
Loans Receivable | United Commercial Bank (UCB) | Covered Loans |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |
Percentage of eligible losses for which the FDIC is obligated to reimburse the Company | 80.00%ewbc_PercentageOfEligibleLossesForWhichFdicIsObligatedToReimburse / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_BusinessAcquisitionAxis = ewbc_UnitedCommercialBankMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |  |  |  |
Percentage of eligible losses in excess of a specified amount for which the FDIC is obligated to reimburse the Company | 95.00%ewbc_PercentageOfEligibleLossesInExcessOfCertainAmountForWhichFdicIsObligatedToReimburse / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_BusinessAcquisitionAxis = ewbc_UnitedCommercialBankMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |  |  |  |
Amount of eligible losses over which the FDIC is obligated to reimburse a higher percentage | $ 2,050,000,000 ewbc_AmountOfEligibleLossesOverWhichFdicIsObligatedToReimburseHigherPercentage / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_BusinessAcquisitionAxis = ewbc_UnitedCommercialBankMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |  |  |  |
Percentage obligation to reimburse the FDIC for eligible recoveries related to covered assets | 80.00%ewbc_PercentageObligationToReimburseFdicForEligibleRecoveriesRelatedToCoveredAssets / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_BusinessAcquisitionAxis = ewbc_UnitedCommercialBankMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |  |  |  |
Percentage obligation to reimburse the FDIC for eligible recoveries related to losses in excess of a specified amount on covered assets | 95.00%ewbc_PercentageObligationToReimburseFdicForEligibleRecoveriesRelatedToLossesInExcessOfCertainAmountOnCoveredAssets / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_BusinessAcquisitionAxis = ewbc_UnitedCommercialBankMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |  |  |  |
Loans Receivable | Washington First International Bank (WFIB) | Covered Loans |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |
Percentage of eligible losses for which the FDIC is obligated to reimburse the Company | 80.00%ewbc_PercentageOfEligibleLossesForWhichFdicIsObligatedToReimburse / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_BusinessAcquisitionAxis = ewbc_WashingtonFirstInternationalBankMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |  |  |  |
Percentage obligation to reimburse the FDIC for eligible recoveries related to covered assets | 80.00%ewbc_PercentageObligationToReimburseFdicForEligibleRecoveriesRelatedToCoveredAssets / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_BusinessAcquisitionAxis = ewbc_WashingtonFirstInternationalBankMember / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |  |  |  |
[1] | Reductions relate to charge-offs, partial prepayments, loan payoffs and loan sales which result in a corresponding reduction of the indemnification asset.
[2] | This represents the change in the calculated estimate the Company will be required to pay the FDIC at the end of the FDIC shared-loss agreements, due to lower thresholds of losses.

X
- Definition Amount of eligible losses for covered assets over which the FDIC is obligated to reimburse a higher percentage pursuant to the shared-loss agreements. + References No definition available. + Details
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- Definition Represents the change in the estimate of cash flows expected to be collected. This relates to a loan accounted for as an available-for-sale debt security, with evidence of deterioration of credit quality since origination that was acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable. + References No definition available. + Details
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- Definition Increases (decreases) to the indemnification asset or liability due to accretion (amortization) of the loan discount (premium) relating to loss sharing agreements with the Federal Deposit Insurance Corporation (FDIC). + References No definition available. + Details
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- Definition Represents the carrying amount of receivable assets (liabilities) originating from the indemnification agreement with the Federal Deposit Insurance Corporation (FDIC), in which the FDIC is to partially cover losses. + References No definition available. + Details
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- Definition Reductions in the FDIC indemnification asset resulting from write-offs, partial prepayments, loan payoffs and disposals. + References No definition available. + Details
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- Definition Carrying amount of liabilities originating from the indemnification agreement with the Federal Deposit Insurance Corporation (FDIC), in which the FDIC is to partially cover losses. + References No definition available. + Details
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- Definition Change in the FDIC indemnification asset or liability for estimated amounts that the entity will be required to pay the FDIC at the end of the loss sharing agreements due to lower thresholds of losses. + References No definition available. + Details
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- Definition Percentage obligation to reimburse the FDIC for eligible recoveries related to covered assets pursuant to the shared-loss agreements. + References No definition available. + Details
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- Definition Percentage obligation to reimburse the FDIC for eligible recoveries related to losses in excess of a certain amount on covered assets pursuant to the shared-loss agreements. + References No definition available. + Details
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- Definition Percentage of eligible losses for which the FDIC is obligated to reimburse the Company pursuant to the shared-loss agreements. + References No definition available. + Details
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- Definition Percentage of eligible losses for covered assets in excess of a certain amount for which the FDIC is obligated to reimburse the Company pursuant to the shared-loss agreements. + References No definition available. + Details
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- Definition Amount of the excess of a loan's cash flows expected to be collected over the investor's initial investment in acquired loans not accounted for as debt securities with evidence of deterioration of credit quality. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=27045933&loc=d3e13503-111538 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 + Details
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- Definition Amount of decrease from accretion of the excess of a loan's cash flows expected to be collected over the investor's initial investment in acquired loans not accounted for as debt securities with evidence of deterioration of credit quality. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=27045933&loc=d3e13503-111538 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 + Details
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- Definition Carrying amount of receivable assets originating from the indemnification agreement with the Federal Deposit Insurance Corporation (FDIC), in which the FDIC is to partially cover losses. + References No definition available. + Details
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