XML 110 R89.htm IDEA: XBRL DOCUMENT
v3.22.4

Investments in Qualified Affordable Housing Partnerships, Tax Credit and Other Investments, Net and Variable Interest Entities - Investments in Tax Credit and Other Investments, Net (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 USD ($) investment | Dec. 31, 2021 USD ($) investment | Dec. 31, 2020 USD ($) investment
Investments in qualified housing partnerships, net |  |  |
Tax credits and other tax benefits recognized | $ 52,132 | $ 50,643 | $ 45,971
Amortization expense included in income tax expense | 38,759 | 33,248 | 37,132
Investments in tax credit and other investments, net |  |  |
(Impairment recoveries) amortization of tax credit and other investments | 113,358 | 122,457 | 70,082
Unrealized (losses) gains on equity securities with readily determinable values | (2,928) | (746) | 732
Impairment recoveries (losses) | $ 469 | $ 1,250 | $ (3,699)
Investment in Tax Credit and Other Investments |  |  |
Investments in tax credit and other investments, net |  |  |
Number of historic tax credits recoveries/losses | investment | 1 | 1 | 3
Number of energy tax credits recoveries | investment | 3 | 2 | 1
Number of Impairment Losses of Historic Tax Credit Investments | investment | 2 |  |
Historic Tax Credit Investment |  |  |
Investments in tax credit and other investments, net |  |  |
Number of historic tax credits recoveries/losses | investment |  |  | 3
Pre-tax impairment charge or recovery | $ 2,900 |  | $ 4,800
Energy Tax Credit Investment |  |  |
Investments in tax credit and other investments, net |  |  |
Pre-tax impairment charge or recovery | $ 3,400 |  | 1,500
Non-Marketable Equity Security |  |  |
Investments in tax credit and other investments, net |  |  |
Pre-tax impairment charge or recovery |  |  | $ 360
Number of impaired or recovered non-marketable equity securities | investment |  |  | 1

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 Amortization of investments in projects that qualify for Community Reinvestment Act ("CRA") and other tax credits, included as a component of noninterest expense. + References No definition available. + Details
Name: | ewbc_NoninterestExpenseImpairmentRecoveriesAmortizationOfTaxCreditAndOtherInvestments
Namespace Prefix: | ewbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Number of Impaired or Recovered Energy Tax Credit Investments + References No definition available. + Details
Name: | ewbc_NumberOfImpairedOrRecoveredEnergyTaxCreditInvestments
Namespace Prefix: | ewbc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of Impaired or Recovered Non-marketable Equity Securities + References No definition available. + Details
Name: | ewbc_NumberOfImpairedOrRecoveredNonMarketableEquitySecurities
Namespace Prefix: | ewbc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of Impairment Losses of Historic Tax Credit Investments + References No definition available. + Details
Name: | ewbc_NumberOfImpairmentLossesOfHistoricTaxCreditInvestments
Namespace Prefix: | ewbc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of Impairment Recoveries of Historic Tax Credit Investments + References No definition available. + Details
Name: | ewbc_NumberOfImpairmentRecoveriesOfHistoricTaxCreditInvestments
Namespace Prefix: | ewbc_
Data Type: | xbrli:integerItemType
Balance Type: | na
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 Tax Credit Investments, Pre-tax Recoveries + References No definition available. + Details
Name: | ewbc_TaxCreditInvestmentsPreTaxRecoveries
Namespace Prefix: | ewbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of affordable housing tax credits and other tax benefits recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 740 -Section 50 -Paragraph 2 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=116633289&loc=SL49122993-202985 + 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 of investment in qualified affordable housing projects. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 740 -Section 50 -Paragraph 2 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=116633289&loc=SL49122993-202985 + Details
Name: | us-gaap_AmortizationMethodQualifiedAffordableHousingProjectInvestmentsAmortization
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of unrealized gain (loss) on investment in marketable security. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(7)(c)) -URI https://asc.fasb.org/extlink&oid=126953954&loc=SL114868664-224227 + Details
Name: | us-gaap_MarketableSecuritiesUnrealizedGainLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=ewbc_InvestmentInTaxCreditAndOtherInvestmentsMember
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: |

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

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