XML 99 R83.htm IDEA: XBRL DOCUMENT
v3.24.2.u1

Affordable Housing Partnership, Tax Credit and Community Reinvestment Act Investments, Net - Schedule of Additional Information related to the Affordable Housing, Tax Credit and CRA Investments, Net (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Equity Method Accounting and Other [Abstract] |  |  |  |
Tax credit and CRA Investments | $ 21,543,000 | $ 58,404,000 | $ 34,137,000 | $ 72,902,000
Total tax credits and benefits | 63,459,000 | 73,708,000 | 121,621,000 | 104,300,000
Equity Method Accounting and Other [Abstract] |  |  |  |
Tax credit and CRA Investments | 16,052,000 | 55,914,000 | 29,259,000 | 66,024,000
Total amortization | 45,841,000 | 66,420,000 | 96,218,000 | 89,196,000
Pre-tax impairment charge or recovery | 0 |  | 0 |
Affordable housing partnership |  |  |  |
Tax credits and benefits |  |  |  |
PAM - Affordable housing partnership investments | 15,612,000 | 15,304,000 | 34,031,000 | 31,398,000
Amortization |  |  |  |
PAM - Affordable housing partnership investments | 9,774,000 | 10,506,000 | 23,643,000 | 23,172,000
Tax credit and CRA investments |  |  |  |
Tax credits and benefits |  |  |  |
PAM - Affordable housing partnership investments | 26,304,000 | 0 | 53,453,000 | 0
Amortization |  |  |  |
PAM - Affordable housing partnership investments | $ 20,015,000 | 0 | $ 43,316,000 | 0
Historic Tax Credit Investment |  |  |  |
Equity Method Accounting and Other [Abstract] |  |  |  |
Pre-tax impairment charge or recovery |  | $ 1,000,000 |  | $ 2,000,000

X
- Definition Amortization + References No definition available. + Details
Name: | ewbc_Amortization
Namespace Prefix: | ewbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amortization Equity Method Accounting and Other + References No definition available. + Details
Name: | ewbc_AmortizationEquityMethodAccountingAndOtherAbstract
Namespace Prefix: | ewbc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Investments in Qualified Affordable Housing Partnerships, Net, And Related Unfunded Commitments + References No definition available. + Details
Name: | ewbc_InvestmentsInQualifiedAffordableHousingPartnershipsNetAndRelatedUnfundedCommitmentsAbstract
Namespace Prefix: | ewbc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Investments in Tax Credit and Other Investments, Net + References No definition available. + Details
Name: | ewbc_InvestmentsInTaxCreditAndOtherInvestmentsNetAbstract
Namespace Prefix: | ewbc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition PAM Equity Method Accounting and Other + References No definition available. + Details
Name: | ewbc_PAMEquityMethodAccountingAndOtherAbstract
Namespace Prefix: | ewbc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tax Credit and Benefit + References No definition available. + Details
Name: | ewbc_TaxCreditAndBenefit
Namespace Prefix: | ewbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Tax credit and CRA Investments, Amortization + References No definition available. + Details
Name: | ewbc_TaxCreditAndCRAInvestmentsAmortization
Namespace Prefix: | ewbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Tax credit and CRA Investments, Tax Credits And Other Tax Benefits, Amount + References No definition available. + Details
Name: | ewbc_TaxCreditAndCRAInvestmentsTaxCreditsAndOtherTaxBenefitsAmount
Namespace Prefix: | ewbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Tax Credit Investments Pre-Tax Impairment Charge Recovery + References No definition available. + Details
Name: | ewbc_TaxCreditInvestmentsPreTaxImpairmentChargeRecovery
Namespace Prefix: | ewbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount, before amortization expense, of income tax credit and other tax benefit generated by investment under tax credit program elected to be accounted for using proportional amortization method. Includes, but is not limited to, investment under tax credit program not meeting condition for accounting under proportional amortization method. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 323 -SubTopic 740 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478156/323-740-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 323 -Name Accounting Standards Codification -Section 50 -Paragraph 1A -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478156/740-323-50-1A + Details
Name: | us-gaap_AffordableHousingTaxCreditsAndOtherTaxBenefitsAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of amortization expense for investment that generates income tax credit and other income tax benefit under tax credit program accounted for using proportional amortization method. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 740 -SubTopic 323 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478156/740-323-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 323 -Name Accounting Standards Codification -Section 50 -Paragraph 1A -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478156/740-323-50-1A + Details
Name: | us-gaap_AmortizationMethodQualifiedAffordableHousingProjectInvestmentsAmortization
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_InvestmentTypeAxis=ewbc_AffordableHousingPartnershipMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=ewbc_TaxCreditAndCRAInvestmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=ewbc_HistoricTaxCreditInvestmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |