XML 48 R37.htm IDEA: XBRL DOCUMENT
v3.5.0.2

FAIR VALUE MEASUREMENT AND FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) - USD ($) $ in Thousands | Sep. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Investment securities available-for-sale |  |
Available-for-sale investment securities | $ 3,236,624 | $ 3,773,226
U.S. Treasury securities |  |
Investment securities available-for-sale |  |
Available-for-sale investment securities | 456,448 | 998,515
U.S. government agency and U.S. government sponsored enterprise debt securities |  |
Investment securities available-for-sale |  |
Available-for-sale investment securities | 383,331 | 768,849
U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities - Commercial mortgage-backed securities |  |
Investment securities available-for-sale |  |
Available-for-sale investment securities | 326,818 | 351,662
U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities - Residential mortgage-backed securities |  |
Investment securities available-for-sale |  |
Available-for-sale investment securities | 1,194,838 | 997,396
Municipal securities |  |
Investment securities available-for-sale |  |
Available-for-sale investment securities | 152,293 | 175,649
Non-agency residential mortgage-backed securities | Investment grade |  |
Investment securities available-for-sale |  |
Available-for-sale investment securities | 52,957 | 62,393
Corporate debt securities | Investment grade |  |
Investment securities available-for-sale |  |
Available-for-sale investment securities | 281,987 | 279,432
Corporate debt securities | Non-investment grade |  |
Investment securities available-for-sale |  |
Available-for-sale investment securities | 8,778 | 9,642
Foreign bonds | Investment grade |  |
Investment securities available-for-sale |  |
Available-for-sale investment securities | 337,434 | 89,795
Other securities |  |
Investment securities available-for-sale |  |
Available-for-sale investment securities | 41,740 | 39,893
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Investment securities available-for-sale |  |
Available-for-sale investment securities | 488,387 | 1,034,150
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. Treasury securities |  |
Investment securities available-for-sale |  |
Available-for-sale investment securities | 456,448 | 998,515
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Foreign bonds |  |
Investment securities available-for-sale |  |
Available-for-sale investment securities |  | 4,514
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other securities |  |
Investment securities available-for-sale |  |
Available-for-sale investment securities | 31,939 | 31,121
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) |  |
Investment securities available-for-sale |  |
Available-for-sale investment securities | 2,748,237 | 2,739,076
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Interest rate swaps and options |  |
Derivative |  |
Derivative assets | 144,293 | 67,215
Derivative liabilities | (146,623) | (67,325)
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Foreign exchange contracts |  |
Derivative |  |
Derivative assets | 6,065 | 10,254
Derivative liabilities | (3,334) | (9,350)
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Interest rate swaps on certificates of deposit |  |
Derivative |  |
Derivative liabilities | (2,137) | (5,213)
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Foreign currency forward contracts |  |
Derivative |  |
Derivative assets |  | 2,365
Derivative liabilities | (78) |
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Credit risk participation agreements (“RPAs”) |  |
Derivative |  |
Derivative liabilities | (8) | (4)
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | U.S. government agency and U.S. government sponsored enterprise debt securities |  |
Investment securities available-for-sale |  |
Available-for-sale investment securities | 383,331 | 768,849
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities - Commercial mortgage-backed securities |  |
Investment securities available-for-sale |  |
Available-for-sale investment securities | 326,818 | 351,662
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities - Residential mortgage-backed securities |  |
Investment securities available-for-sale |  |
Available-for-sale investment securities | 1,194,838 | 997,396
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Municipal securities |  |
Investment securities available-for-sale |  |
Available-for-sale investment securities | 152,293 | 175,649
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Non-agency residential mortgage-backed securities | Investment grade |  |
Investment securities available-for-sale |  |
Available-for-sale investment securities | 52,957 | 62,393
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Corporate debt securities | Investment grade |  |
Investment securities available-for-sale |  |
Available-for-sale investment securities | 281,987 | 279,432
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Corporate debt securities | Non-investment grade |  |
Investment securities available-for-sale |  |
Available-for-sale investment securities | 8,778 | 9,642
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Foreign bonds |  |
Investment securities available-for-sale |  |
Available-for-sale investment securities |  | 85,281
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Foreign bonds | Investment grade |  |
Investment securities available-for-sale |  |
Available-for-sale investment securities | 337,434 |
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Other securities |  |
Investment securities available-for-sale |  |
Available-for-sale investment securities | 9,801 | 8,772
Fair Value, Measurements, Recurring | Fair Value Measurements |  |
Investment securities available-for-sale |  |
Available-for-sale investment securities | 3,236,624 | 3,773,226
Fair Value, Measurements, Recurring | Fair Value Measurements | Interest rate swaps and options |  |
Derivative |  |
Derivative assets | 144,293 | 67,215
Derivative liabilities | (146,623) | (67,325)
Fair Value, Measurements, Recurring | Fair Value Measurements | Foreign exchange contracts |  |
Derivative |  |
Derivative assets | 6,065 | 10,254
Derivative liabilities | (3,334) | (9,350)
Fair Value, Measurements, Recurring | Fair Value Measurements | Interest rate swaps on certificates of deposit |  |
Derivative |  |
Derivative liabilities | (2,137) | (5,213)
Fair Value, Measurements, Recurring | Fair Value Measurements | Foreign currency forward contracts |  |
Derivative |  |
Derivative assets |  | 2,365
Derivative liabilities | (78) |
Fair Value, Measurements, Recurring | Fair Value Measurements | Credit risk participation agreements (“RPAs”) |  |
Derivative |  |
Derivative liabilities | (8) | (4)
Fair Value, Measurements, Recurring | Fair Value Measurements | U.S. Treasury securities |  |
Investment securities available-for-sale |  |
Available-for-sale investment securities | 456,448 | 998,515
Fair Value, Measurements, Recurring | Fair Value Measurements | U.S. government agency and U.S. government sponsored enterprise debt securities |  |
Investment securities available-for-sale |  |
Available-for-sale investment securities | 383,331 | 768,849
Fair Value, Measurements, Recurring | Fair Value Measurements | U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities - Commercial mortgage-backed securities |  |
Investment securities available-for-sale |  |
Available-for-sale investment securities | 326,818 | 351,662
Fair Value, Measurements, Recurring | Fair Value Measurements | U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities - Residential mortgage-backed securities |  |
Investment securities available-for-sale |  |
Available-for-sale investment securities | 1,194,838 | 997,396
Fair Value, Measurements, Recurring | Fair Value Measurements | Municipal securities |  |
Investment securities available-for-sale |  |
Available-for-sale investment securities | 152,293 | 175,649
Fair Value, Measurements, Recurring | Fair Value Measurements | Non-agency residential mortgage-backed securities | Investment grade |  |
Investment securities available-for-sale |  |
Available-for-sale investment securities | 52,957 | 62,393
Fair Value, Measurements, Recurring | Fair Value Measurements | Corporate debt securities | Investment grade |  |
Investment securities available-for-sale |  |
Available-for-sale investment securities | 281,987 | 279,432
Fair Value, Measurements, Recurring | Fair Value Measurements | Corporate debt securities | Non-investment grade |  |
Investment securities available-for-sale |  |
Available-for-sale investment securities | 8,778 | 9,642
Fair Value, Measurements, Recurring | Fair Value Measurements | Foreign bonds |  |
Investment securities available-for-sale |  |
Available-for-sale investment securities |  | 89,795
Fair Value, Measurements, Recurring | Fair Value Measurements | Foreign bonds | Investment grade |  |
Investment securities available-for-sale |  |
Available-for-sale investment securities | 337,434 |
Fair Value, Measurements, Recurring | Fair Value Measurements | Other securities |  |
Investment securities available-for-sale |  |
Available-for-sale investment securities | $ 41,740 | $ 39,893

X
- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=51813488&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49167202&loc=d3e26610-111562 + Details
Name: | us-gaap_AvailableForSaleSecurities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

X
- Definition Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and elected not to be offset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 + Details
Name: | us-gaap_DerivativeAssetFairValueGrossAssetIncludingNotSubjectToMasterNettingArrangement
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

X
- Definition Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and elected not to be offset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 + Details
Name: | us-gaap_DerivativeLiabilityFairValueGrossLiabilityIncludingNotSubjectToMasterNettingArrangement
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=us-gaap_USTreasurySecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=ewbc_CommercialMortgageBackedSecuritiesIssuedByUSGovernmentAgenciesAndGovernmentSponsoredEnterpriseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=ewbc_ResidentialMortgageBackedSecuritiesIssuedByUSGovernmentAgenciesAndGovernmentSponsoredEnterpriseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=us-gaap_USStatesAndPoliticalSubdivisionsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=us-gaap_ResidentialMortgageBackedSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ExternalCreditRatingByGroupingAxis=us-gaap_ExternalCreditRatingInvestmentGradeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=us-gaap_CorporateDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ExternalCreditRatingByGroupingAxis=us-gaap_ExternalCreditRatingNonInvestmentGradeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=ewbc_ForeignGovernmentAndCorporateDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=ewbc_OtherSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=us-gaap_ForeignExchangeContractMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=ewbc_InterestRateSwapsOnCertificatesOfDepositsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=us-gaap_ForeignExchangeForwardMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=us-gaap_CreditRiskContractMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByMeasurementBasisAxis=us-gaap_EstimateOfFairValueFairValueDisclosureMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |