XML 101 R38.htm IDEA: XBRL DOCUMENT
v3.3.0.814

FAIR VALUE MEASUREMENT AND FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) - USD ($) $ in Thousands | Sep. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Available-for-sale investment securities |  |
Total available-for-sale investment securities | $ 2,952,277 | $ 2,626,617
Derivative |  |
Derivative assets | 6,510 | 12,383
Derivative liabilities | (98,748) | (56,493)
U.S. Treasury securities |  |
Available-for-sale investment securities |  |
Total available-for-sale investment securities | 752,605 | 873,435
U.S. government agency and U.S. government sponsored enterprise debt securities |  |
Available-for-sale investment securities |  |
Total available-for-sale investment securities | 701,844 | 311,024
U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities - Commercial mortgage-backed securities |  |
Available-for-sale investment securities |  |
Total available-for-sale investment securities | 273,350 | 141,420
U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities - Residential mortgage-backed securities |  |
Available-for-sale investment securities |  |
Total available-for-sale investment securities | 754,898 | 791,088
Municipal securities |  |
Available-for-sale investment securities |  |
Total available-for-sale investment securities | 206,825 | 250,448
Other residential mortgage-backed securities | Investment grade |  |
Available-for-sale investment securities |  |
Total available-for-sale investment securities | 66,537 | 53,918
Other commercial mortgage-backed securities | Investment grade |  |
Available-for-sale investment securities |  |
Total available-for-sale investment securities |  | 34,053
Corporate debt securities | Investment grade |  |
Available-for-sale investment securities |  |
Total available-for-sale investment securities | 141,126 | 115,182
Corporate debt securities | Non-investment grade |  |
Available-for-sale investment securities |  |
Total available-for-sale investment securities | 10,524 | 14,681
Other securities |  |
Available-for-sale investment securities |  |
Total available-for-sale investment securities | 44,568 | 41,368
Fair Value, Measurements, Recurring |  |
Available-for-sale investment securities |  |
Total available-for-sale investment securities | 2,952,277 | 2,626,617
Fair Value, Measurements, Recurring | Foreign exchange options |  |
Derivative |  |
Derivative assets |  | 6,136
Fair Value, Measurements, Recurring | Interest rate swaps on certificates of deposit |  |
Derivative |  |
Derivative liabilities | (3,339) | (9,922)
Fair Value, Measurements, Recurring | Interest rate swaps and caps |  |
Derivative |  |
Derivative assets | 86,954 | 41,534
Derivative liabilities | (87,330) | (41,779)
Fair Value, Measurements, Recurring | Foreign exchange contracts |  |
Derivative |  |
Derivative assets | 9,745 | 8,118
Derivative liabilities | (12,373) | (9,163)
Fair Value, Measurements, Recurring | Embedded derivative liabilities |  |
Derivative |  |
Derivative liabilities |  | (3,392)
Fair Value, Measurements, Recurring | U.S. Treasury securities |  |
Available-for-sale investment securities |  |
Total available-for-sale investment securities | 752,605 | 873,435
Fair Value, Measurements, Recurring | U.S. government agency and U.S. government sponsored enterprise debt securities |  |
Available-for-sale investment securities |  |
Total available-for-sale investment securities | 701,844 | 311,024
Fair Value, Measurements, Recurring | U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities - Commercial mortgage-backed securities |  |
Available-for-sale investment securities |  |
Total available-for-sale investment securities | 273,350 | 141,420
Fair Value, Measurements, Recurring | U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities - Residential mortgage-backed securities |  |
Available-for-sale investment securities |  |
Total available-for-sale investment securities | 754,898 | 791,088
Fair Value, Measurements, Recurring | Municipal securities |  |
Available-for-sale investment securities |  |
Total available-for-sale investment securities | 206,825 | 250,448
Fair Value, Measurements, Recurring | Other residential mortgage-backed securities | Investment grade |  |
Available-for-sale investment securities |  |
Total available-for-sale investment securities | 66,537 | 53,918
Fair Value, Measurements, Recurring | Other commercial mortgage-backed securities | Investment grade |  |
Available-for-sale investment securities |  |
Total available-for-sale investment securities | 0 | 34,053
Fair Value, Measurements, Recurring | Corporate debt securities | Investment grade |  |
Available-for-sale investment securities |  |
Total available-for-sale investment securities | 141,126 | 115,182
Fair Value, Measurements, Recurring | Corporate debt securities | Non-investment grade |  |
Available-for-sale investment securities |  |
Total available-for-sale investment securities | 10,524 | 14,681
Fair Value, Measurements, Recurring | Other securities |  |
Available-for-sale investment securities |  |
Total available-for-sale investment securities | 44,568 | 41,368
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Available-for-sale investment securities |  |
Total available-for-sale investment securities | 788,829 | 905,792
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. Treasury securities |  |
Available-for-sale investment securities |  |
Total available-for-sale investment securities | 752,605 | 873,435
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other securities |  |
Available-for-sale investment securities |  |
Total available-for-sale investment securities | 36,224 | 32,357
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) |  |
Available-for-sale investment securities |  |
Total available-for-sale investment securities | 2,163,448 | 1,714,297
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Foreign exchange options |  |
Derivative |  |
Derivative assets |  | 6,136
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Interest rate swaps on certificates of deposit |  |
Derivative |  |
Derivative liabilities | (3,339) | (9,922)
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Interest rate swaps and caps |  |
Derivative |  |
Derivative assets | 86,954 | 41,534
Derivative liabilities | (87,330) | (41,779)
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Foreign exchange contracts |  |
Derivative |  |
Derivative assets | 9,745 | 8,118
Derivative liabilities | (12,373) | (9,163)
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | U.S. government agency and U.S. government sponsored enterprise debt securities |  |
Available-for-sale investment securities |  |
Total available-for-sale investment securities | 701,844 | 311,024
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 |  |
Available-for-sale investment securities |  |
Total available-for-sale investment securities | 273,350 | 141,420
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 |  |
Available-for-sale investment securities |  |
Total available-for-sale investment securities | 754,898 | 791,088
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Municipal securities |  |
Available-for-sale investment securities |  |
Total available-for-sale investment securities | 206,825 | 250,448
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Other residential mortgage-backed securities | Investment grade |  |
Available-for-sale investment securities |  |
Total available-for-sale investment securities | 66,537 | 53,918
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Other commercial mortgage-backed securities | Investment grade |  |
Available-for-sale investment securities |  |
Total available-for-sale investment securities | 0 | 34,053
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Corporate debt securities | Investment grade |  |
Available-for-sale investment securities |  |
Total available-for-sale investment securities | 141,126 | 115,182
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Corporate debt securities | Non-investment grade |  |
Available-for-sale investment securities |  |
Total available-for-sale investment securities | 10,524 | 8,153
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Other securities |  |
Available-for-sale investment securities |  |
Total available-for-sale investment securities | $ 8,344 | 9,011
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) |  |
Available-for-sale investment securities |  |
Total available-for-sale investment securities |  | 6,528
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Embedded derivative liabilities |  |
Derivative |  |
Derivative liabilities |  | (3,392)
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Corporate debt securities | Non-investment grade |  |
Available-for-sale investment securities |  |
Total available-for-sale investment securities |  | $ 6,528

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, after the 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 not elected 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 (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13433-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13495-108611 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226008-175313 + Details
Name: | us-gaap_DerivativeAssets
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, after the 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 not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226008-175313 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13495-108611 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13433-108611 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 + Details
Name: | us-gaap_DerivativeLiabilities
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_CommercialMortgageBackedSecuritiesMember
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_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_DerivativeInstrumentRiskAxis=us-gaap_ForeignExchangeOptionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=us-gaap_InterestRateContractMember
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=us-gaap_EmbeddedDerivativeFinancialInstrumentsMember
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: |