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COVERED ASSETS AND FDIC INDEMNIFICATION ASSET (Details 7) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
FDIC indemnification asset/(Payable to FDIC, net) |  |  |  |  |
Ending Balance | $ 96,106 ewbc_FdicIndemnificationAssetLiabilities |  |  |  |
FDIC receivable activity |  |  |  |  |
Payments received from the FDIC | (1,343)us-gaap_FDICIndemnificationAssetCashPaymentsReceived |  | 55,826 us-gaap_FDICIndemnificationAssetCashPaymentsReceived |  | 76,094 us-gaap_FDICIndemnificationAssetCashPaymentsReceived
Covered Loans |  |  |  |  |
FDIC indemnification asset/(Payable to FDIC, net) |  |  |  |  |
Beginning balance | 74,708 ewbc_FdicIndemnificationAssetLiabilities / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |  | 316,313 ewbc_FdicIndemnificationAssetLiabilities / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |  |
(Amortization) Accretion | (101,638)us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |  | (99,055)us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |  |
Reductions | (33,595)ewbc_Reductions / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember | [1] | (95,536)ewbc_Reductions / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember | [1] |
Estimate of FDIC repayment | (35,581)ewbc_FdicRepayments / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember | [2] | (47,014)ewbc_FdicRepayments / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember | [2] |
Ending Balance | (96,106)ewbc_FdicIndemnificationAssetLiabilities / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |  | 74,708 ewbc_FdicIndemnificationAssetLiabilities / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |  |
FDIC Receivable |  |  |  |  |
Percentage of reimbursable expenses that are loan-related and OREO expenses that are recorded as non-interest expense | 100.00%ewbc_PercentageOfLoanRelatedAndOreoExpensesRecordedAsNonInterestExpense / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |  |  |  |
Percentage of any reimbursable expense recorded as noninterest income | 80.00%ewbc_PercentageOfAnyReimbursableExpenseRecordedAsNoninterestIncome / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |  |  |  |
Percentage of actual expense paid by the Company | 20.00%ewbc_PercentageOfActualExpensePaid / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |  |  |  |
Percentage of Recoveries received | 80.00%ewbc_PercentageOfFdicInRecoveriesReceived / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |  |  |  |
FDIC receivable activity |  |  |  |  |
Beginning balance | 30,261 ewbc_FDICLossSharingReceivable / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |  | 73,091 ewbc_FDICLossSharingReceivable / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |  |
Net (reduction) addition due to recovery or eligible expense/loss | (30,601)us-gaap_FDICIndemnificationAssetAdditionalEstimatedLosses / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |  | 12,996 us-gaap_FDICIndemnificationAssetAdditionalEstimatedLosses / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |  |
Payments received from the FDIC | 1,343 us-gaap_FDICIndemnificationAssetCashPaymentsReceived / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |  | (55,826)us-gaap_FDICIndemnificationAssetCashPaymentsReceived / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |  |
Ending Balance | $ 1,003 ewbc_FDICLossSharingReceivable / ewbc_ReceivableByIndemnificationStatusAxis = ewbc_CoveredLoansMember |  | $ 30,261 ewbc_FDICLossSharingReceivable / 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 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
Name: | ewbc_FdicIndemnificationAssetLiabilities
Namespace Prefix: | ewbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | ewbc_FDICIndemnificationAssetLiabilitiesRollForward
Namespace Prefix: | ewbc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The carrying amount as of the balance sheet date of the FDIC loss sharing receivable which represents the amounts reimbursable from the FDIC that have not yet been received. + References No definition available. + Details
Name: | ewbc_FDICLossSharingReceivable
Namespace Prefix: | ewbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | ewbc_FdicReceivableAbstract
Namespace Prefix: | ewbc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | ewbc_FDICReceivableRollForward
Namespace Prefix: | ewbc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the decrease in the FDIC indemnification asset due to estimated repayments. + References No definition available. + Details
Name: | ewbc_FdicRepayments
Namespace Prefix: | ewbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The percentage of the actual expenses paid by the Company representing the net of the reimbursable expenses recorded in noninterest expense over the reimbursable expenses recorded in noninterest income. + References No definition available. + Details
Name: | ewbc_PercentageOfActualExpensePaid
Namespace Prefix: | ewbc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The percentage of any reimbursable expense (chargeoffs, loan related expenses and OREO related expenses) that is recorded as noninterest income on the Condensed Consolidated Statement of Income. + References No definition available. + Details
Name: | ewbc_PercentageOfAnyReimbursableExpenseRecordedAsNoninterestIncome
Namespace Prefix: | ewbc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the percentage share of FDIC in recoveries received. + References No definition available. + Details
Name: | ewbc_PercentageOfFdicInRecoveriesReceived
Namespace Prefix: | ewbc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The percentage of reimbursable expenses (loan related and OREO expenses) recorded as non-interest expense on the Condensed Consolidated Statements of Income. + References No definition available. + Details
Name: | ewbc_PercentageOfLoanRelatedAndOreoExpensesRecordedAsNonInterestExpense
Namespace Prefix: | ewbc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Reductions in the FDIC indemnification asset. + References No definition available. + Details
Name: | ewbc_Reductions
Namespace Prefix: | ewbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The sum of the periodic adjustments of the differences between securities' face values and purchase prices that are charged against earnings. This is called accretion if the security was purchased at a discount and amortization if it was purchased at premium. As a noncash item, this element is an adjustment to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
Name: | us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of increases to the indemnification asset due to additional estimated losses assumed by the Federal Deposit Insurance Corporation (FDIC), relating to loss sharing agreements with the FDIC. + References No definition available. + Details
Name: | us-gaap_FDICIndemnificationAssetAdditionalEstimatedLosses
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of decreases to the indemnification asset due to cash payments received relating to loss sharing agreements with the Federal Deposit Insurance Corporation (FDIC). + References No definition available. + Details
Name: | us-gaap_FDICIndemnificationAssetCashPaymentsReceived
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | ewbc_ReceivableByIndemnificationStatusAxis=ewbc_CoveredLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |