XML 60 R45.htm IDEA: XBRL DOCUMENT
v3.23.2

Fair Value Measurement and Fair Value of Financial Instruments - Carrying Amounts of Assets That Were Still Held and Had Fair Value Changes Measured on a Nonrecurring Basis (Details) - Fair Value, Measurements, Nonrecurring - USD ($) $ in Thousands | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Fair Value, Assets Measured on a Nonrecurring Basis |  |
Loans held-for-investment, fair value disclosure | $ 35,721 | $ 72,614
Tax credit investments |  |
Fair Value, Assets Measured on a Nonrecurring Basis |  |
Assets, fair value disclosure | 868 |
Commercial lending |  |
Fair Value, Assets Measured on a Nonrecurring Basis |  |
Loans held-for-investment, fair value disclosure | 35,721 | 71,391
Consumer lending |  |
Fair Value, Assets Measured on a Nonrecurring Basis |  |
Loans held-for-investment, fair value disclosure |  | 1,223
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Fair Value, Assets Measured on a Nonrecurring Basis |  |
Loans held-for-investment, fair value disclosure | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Tax credit investments |  |
Fair Value, Assets Measured on a Nonrecurring Basis |  |
Assets, fair value disclosure | 0 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Commercial lending |  |
Fair Value, Assets Measured on a Nonrecurring Basis |  |
Loans held-for-investment, fair value disclosure | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Consumer lending |  |
Fair Value, Assets Measured on a Nonrecurring Basis |  |
Loans held-for-investment, fair value disclosure |  | 0
Significant Other Observable Inputs (Level 2) |  |
Fair Value, Assets Measured on a Nonrecurring Basis |  |
Loans held-for-investment, fair value disclosure | 0 | 0
Significant Other Observable Inputs (Level 2) | Tax credit investments |  |
Fair Value, Assets Measured on a Nonrecurring Basis |  |
Assets, fair value disclosure | 0 |
Significant Other Observable Inputs (Level 2) | Commercial lending |  |
Fair Value, Assets Measured on a Nonrecurring Basis |  |
Loans held-for-investment, fair value disclosure | 0 | 0
Significant Other Observable Inputs (Level 2) | Consumer lending |  |
Fair Value, Assets Measured on a Nonrecurring Basis |  |
Loans held-for-investment, fair value disclosure |  | 0
Significant Unobservable Inputs (Level 3) |  |
Fair Value, Assets Measured on a Nonrecurring Basis |  |
Loans held-for-investment, fair value disclosure | 35,721 | 72,614
Significant Unobservable Inputs (Level 3) | Tax credit investments |  |
Fair Value, Assets Measured on a Nonrecurring Basis |  |
Assets, fair value disclosure | 868 |
Significant Unobservable Inputs (Level 3) | Commercial lending |  |
Fair Value, Assets Measured on a Nonrecurring Basis |  |
Loans held-for-investment, fair value disclosure | 35,721 | 71,391
Significant Unobservable Inputs (Level 3) | Consumer lending |  |
Fair Value, Assets Measured on a Nonrecurring Basis |  |
Loans held-for-investment, fair value disclosure |  | 1,223
Commercial and industrial (“C&I”) | Commercial lending |  |
Fair Value, Assets Measured on a Nonrecurring Basis |  |
Loans held-for-investment, fair value disclosure | 31,323 | 40,011
Commercial and industrial (“C&I”) | Quoted Prices in Active Markets for Identical Assets (Level 1) | Commercial lending |  |
Fair Value, Assets Measured on a Nonrecurring Basis |  |
Loans held-for-investment, fair value disclosure | 0 | 0
Commercial and industrial (“C&I”) | Significant Other Observable Inputs (Level 2) | Commercial lending |  |
Fair Value, Assets Measured on a Nonrecurring Basis |  |
Loans held-for-investment, fair value disclosure | 0 | 0
Commercial and industrial (“C&I”) | Significant Unobservable Inputs (Level 3) | Commercial lending |  |
Fair Value, Assets Measured on a Nonrecurring Basis |  |
Loans held-for-investment, fair value disclosure | 31,323 | 40,011
CRE | Commercial lending |  |
Fair Value, Assets Measured on a Nonrecurring Basis |  |
Loans held-for-investment, fair value disclosure | 4,398 | 31,380
CRE | Quoted Prices in Active Markets for Identical Assets (Level 1) | Commercial lending |  |
Fair Value, Assets Measured on a Nonrecurring Basis |  |
Loans held-for-investment, fair value disclosure | 0 | 0
CRE | Significant Other Observable Inputs (Level 2) | Commercial lending |  |
Fair Value, Assets Measured on a Nonrecurring Basis |  |
Loans held-for-investment, fair value disclosure | 0 | 0
CRE | Significant Unobservable Inputs (Level 3) | Commercial lending |  |
Fair Value, Assets Measured on a Nonrecurring Basis |  |
Loans held-for-investment, fair value disclosure | $ 4,398 | 31,380
HELOCs | Consumer lending |  |
Fair Value, Assets Measured on a Nonrecurring Basis |  |
Loans held-for-investment, fair value disclosure |  | 1,223
HELOCs | Quoted Prices in Active Markets for Identical Assets (Level 1) | Consumer lending |  |
Fair Value, Assets Measured on a Nonrecurring Basis |  |
Loans held-for-investment, fair value disclosure |  | 0
HELOCs | Significant Other Observable Inputs (Level 2) | Consumer lending |  |
Fair Value, Assets Measured on a Nonrecurring Basis |  |
Loans held-for-investment, fair value disclosure |  | 0
HELOCs | Significant Unobservable Inputs (Level 3) | Consumer lending |  |
Fair Value, Assets Measured on a Nonrecurring Basis |  |
Loans held-for-investment, fair value disclosure |  | $ 1,223

X
- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
Name: | us-gaap_AssetsFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-3 + Details
Name: | us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Publisher FASB -URI https://asc.fasb.org//310-10/tableOfContent + Details
Name: | us-gaap_LoansReceivableFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsNonrecurringMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByAssetClassAxis=ewbc_InvestmentsInTaxCreditAndOtherInvestmentsNetMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=ewbc_CommercialAndIndustrialLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_CommercialRealEstateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_HomeEquityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |