XML 53 R42.htm IDEA: XBRL DOCUMENT
v3.7.0.1

Fair Value Measurement and Fair Value of Financial Instruments (Details 3) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Loans held-for-sale |  |  |  |
Fair Value, Assets Measured on a Nonrecurring Basis |  |  |  |
Fair value adjustments of assets | $ (8,000) | $ 0 | $ 61,000 | $ 2,400,000
Fair Value, Measurements, Nonrecurring | Non-PCI impaired loans |  |  |  |
Fair Value, Assets Measured on a Nonrecurring Basis |  |  |  |
Fair value adjustments of assets | (13,873,000) | (4,960,000) | (11,371,000) | (7,200,000)
Fair Value, Measurements, Nonrecurring | Non-PCI impaired loans | CRE |  |  |  |
Fair Value, Assets Measured on a Nonrecurring Basis |  |  |  |
Fair value adjustments of assets | 193,000 | (261,000) | (29,000) | 1,908,000
Fair Value, Measurements, Nonrecurring | Non-PCI impaired loans | C&I |  |  |  |
Fair Value, Assets Measured on a Nonrecurring Basis |  |  |  |
Fair value adjustments of assets | (14,060,000) | (4,693,000) | (11,418,000) | (9,149,000)
Fair Value, Measurements, Nonrecurring | Non-PCI impaired loans | Residential |  |  |  |
Fair Value, Assets Measured on a Nonrecurring Basis |  |  |  |
Fair value adjustments of assets | (30,000) | (4,000) | 51,000 | 27,000
Fair Value, Measurements, Nonrecurring | Non-PCI impaired loans | Consumer |  |  |  |
Fair Value, Assets Measured on a Nonrecurring Basis |  |  |  |
Fair value adjustments of assets | 24,000 | (2,000) | 25,000 | 14,000
Fair Value, Measurements, Nonrecurring | OREO |  |  |  |
Fair Value, Assets Measured on a Nonrecurring Basis |  |  |  |
Fair value adjustments of assets | 0 | (1,073,000) | (285,000) | (1,529,000)
Fair Value, Measurements, Nonrecurring | Loans held-for-sale |  |  |  |
Fair Value, Assets Measured on a Nonrecurring Basis |  |  |  |
Fair value adjustments of assets | $ 0 | $ 0 | $ 0 | $ (2,351,000)

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_FairValueByAssetClassAxis=ewbc_LoansHeldForSaleMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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_CommercialRealEstatePortfolioSegmentMember
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_ResidentialPortfolioSegmentMember
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_FairValueByAssetClassAxis=ewbc_OtherRealEstateOwnedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |