XML 177 R67.htm IDEA: XBRL DOCUMENT
v3.19.3.a.u2

Fair Value Measurement and Fair Value of Financial Instruments (Increase (Decrease) in Value of Assets Measured on a Nonrecurring Basis) (Details) - Fair Value, Measurements, Nonrecurring - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Non-PCI impaired loans |  |  |
Fair Value, Assets Measured on a Nonrecurring Basis |  |  |
Increase (decrease) in fair value of assets | $ (35,358) | $ (9,056) | $ (22,624)
Non-PCI impaired loans | Commercial Lending |  |  |
Fair Value, Assets Measured on a Nonrecurring Basis |  |  |
Increase (decrease) in fair value of assets | (35,356) | (9,071) | (20,122)
Non-PCI impaired loans | Commercial Lending | C&I |  |  |
Fair Value, Assets Measured on a Nonrecurring Basis |  |  |
Increase (decrease) in fair value of assets | (35,365) | (9,341) | (19,703)
Non-PCI impaired loans | Commercial Lending | CRE |  |  |
Fair Value, Assets Measured on a Nonrecurring Basis |  |  |
Increase (decrease) in fair value of assets | 9 | 270 | (272)
Non-PCI impaired loans | Commercial Lending | Construction and land |  |  |
Fair Value, Assets Measured on a Nonrecurring Basis |  |  |
Increase (decrease) in fair value of assets | 0 | 0 | (147)
Non-PCI impaired loans | Commercial Lending | Total CRE |  |  |
Fair Value, Assets Measured on a Nonrecurring Basis |  |  |
Increase (decrease) in fair value of assets | 9 | 270 | (419)
Non-PCI impaired loans | Consumer Lending |  |  |
Fair Value, Assets Measured on a Nonrecurring Basis |  |  |
Increase (decrease) in fair value of assets | (2) | 15 | (2,502)
Non-PCI impaired loans | Consumer Lending | Residential loan |  |  |
Fair Value, Assets Measured on a Nonrecurring Basis |  |  |
Increase (decrease) in fair value of assets | (2) | 15 | (11)
Non-PCI impaired loans | Consumer Lending | Residential loan | Single-family |  |  |
Fair Value, Assets Measured on a Nonrecurring Basis |  |  |
Increase (decrease) in fair value of assets | 0 | 15 | (11)
Non-PCI impaired loans | Consumer Lending | HELOCs |  |  |
Fair Value, Assets Measured on a Nonrecurring Basis |  |  |
Increase (decrease) in fair value of assets | (2) | 0 | 0
Non-PCI impaired loans | Consumer Lending | Other consumer |  |  |
Fair Value, Assets Measured on a Nonrecurring Basis |  |  |
Increase (decrease) in fair value of assets | 0 | 0 | (2,491)
OREO |  |  |
Fair Value, Assets Measured on a Nonrecurring Basis |  |  |
Increase (decrease) in fair value of assets | (8) | 0 | (1)
Investments in tax credit and other investments, net |  |  |
Fair Value, Assets Measured on a Nonrecurring Basis |  |  |
Increase (decrease) in fair value of assets | $ (13,023) | $ 0 | $ 0

X
- Definition Amount of addition (reduction) to the amount at which an asset could be incurred (settled) in a current transaction between willing parties. + References No definition available. + Details
Name: | us-gaap_AssetsFairValueAdjustment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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 No definition available. + Details
Name: | us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember
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_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=ewbc_ConstructionAndLandLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=srt_SingleFamilyMember
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: |

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

X
- Details
Name: | us-gaap_FairValueByAssetClassAxis=ewbc_OtherRealEstateOwnedMember
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: |