XML 64 R44.htm IDEA: XBRL DOCUMENT
v3.20.2

Fair Value Measurement and Fair Value of Financial Instruments (Quantitative Information for Significant Unobservable Inputs) (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Quantitative information |  |
Derivative assets - Fair value | $ 708,610 | $ 330,316
Fair Value, Measurements, Recurring |  |
Quantitative information |  |
Derivative assets - Fair value | 708,610 | 330,316
Fair Value, Measurements, Nonrecurring |  |
Quantitative information |  |
Loans held-for-invesment, Fair Value Disclosure | 171,004 | 49,679
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring |  |
Quantitative information |  |
Derivative assets - Fair value | 310 | 421
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Nonrecurring |  |
Quantitative information |  |
Loans held-for-invesment, Fair Value Disclosure | 171,004 | 49,679
Significant Unobservable Inputs (Level 3) | Discounted cash flows | Fair Value, Measurements, Nonrecurring |  |
Quantitative information |  |
Loans held-for-invesment, Fair Value Disclosure | 82,461 | 27,841
Significant Unobservable Inputs (Level 3) | Fair value of collateral, discount | Fair Value, Measurements, Nonrecurring |  |
Quantitative information |  |
Loans held-for-invesment, Fair Value Disclosure | 15,493 | 1,014
Significant Unobservable Inputs (Level 3) | Fair value of property, selling cost | Fair Value, Measurements, Nonrecurring |  |
Quantitative information |  |
Loans held-for-invesment, Fair Value Disclosure | 50,581 |
Significant Unobservable Inputs (Level 3) | Fair value of collateral, contract value | Fair Value, Measurements, Nonrecurring |  |
Quantitative information |  |
Loans held-for-invesment, Fair Value Disclosure | 22,469 | 20,824
OREO | Fair Value, Measurements, Nonrecurring |  |
Quantitative information |  |
Assets, fair value disclosure |  | 125
OREO | Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Nonrecurring |  |
Quantitative information |  |
Assets, fair value disclosure |  | 125
OREO | Significant Unobservable Inputs (Level 3) | Fair value of property, selling cost | Fair Value, Measurements, Nonrecurring |  |
Quantitative information |  |
Assets, fair value disclosure |  | 125
Other nonperforming assets | Fair Value, Measurements, Nonrecurring |  |
Quantitative information |  |
Assets, fair value disclosure |  | 1,167
Other nonperforming assets | Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Nonrecurring |  |
Quantitative information |  |
Assets, fair value disclosure |  | 1,167
Other nonperforming assets | Significant Unobservable Inputs (Level 3) | Fair value of collateral, contract value | Fair Value, Measurements, Nonrecurring |  |
Quantitative information |  |
Assets, fair value disclosure |  | 1,167
Investments in tax credit and other investments, net | Fair Value, Measurements, Nonrecurring |  |
Quantitative information |  |
Assets, fair value disclosure | 6,216 | 3,076
Investments in tax credit and other investments, net | Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Nonrecurring |  |
Quantitative information |  |
Assets, fair value disclosure | 6,216 | 3,076
Investments in tax credit and other investments, net | Significant Unobservable Inputs (Level 3) | Individual analysis of each investment, expected future tax benefits and distributions | Fair Value, Measurements, Nonrecurring |  |
Quantitative information |  |
Assets, fair value disclosure | 6,216 | 3,076
Equity contracts | Fair Value, Measurements, Recurring |  |
Quantitative information |  |
Derivative assets - Fair value | 12,765 | 1,414
Equity contracts | Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring |  |
Quantitative information |  |
Derivative assets - Fair value | $ 310 | $ 421
Equity volatility | Equity contracts | Significant Unobservable Inputs (Level 3) | Black-Scholes option pricing model | Fair Value, Measurements, Recurring | Weighted Average |  |
Quantitative information |  |
Measurement input | 59.00% | 42.00%
Equity volatility | Equity contracts | Significant Unobservable Inputs (Level 3) | Black-Scholes option pricing model | Fair Value, Measurements, Recurring | Minimum |  |
Quantitative information |  |
Measurement input | 54.00% | 39.00%
Equity volatility | Equity contracts | Significant Unobservable Inputs (Level 3) | Black-Scholes option pricing model | Fair Value, Measurements, Recurring | Maximum |  |
Quantitative information |  |
Measurement input | 65.00% | 44.00%
Liquidity discount | Equity contracts | Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring |  |
Quantitative information |  |
Measurement input | 47.00% | 47.00%
Liquidity discount | Equity contracts | Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Weighted Average |  |
Quantitative information |  |
Measurement input | 47.00% | 47.00%
Discount | Significant Unobservable Inputs (Level 3) | Discounted cash flows | Fair Value, Measurements, Nonrecurring | Weighted Average |  |
Quantitative information |  |
Loans held-for-investment, measurement input | 13.00% | 14.00%
Discount | Significant Unobservable Inputs (Level 3) | Discounted cash flows | Fair Value, Measurements, Nonrecurring | Minimum |  |
Quantitative information |  |
Loans held-for-investment, measurement input | 4.00% | 4.00%
Discount | Significant Unobservable Inputs (Level 3) | Discounted cash flows | Fair Value, Measurements, Nonrecurring | Maximum |  |
Quantitative information |  |
Loans held-for-investment, measurement input | 15.00% | 15.00%
Discount | Significant Unobservable Inputs (Level 3) | Fair value of collateral, discount | Fair Value, Measurements, Nonrecurring | Weighted Average |  |
Quantitative information |  |
Loans held-for-investment, measurement input | 10.00% | 19.00%
Discount | Significant Unobservable Inputs (Level 3) | Fair value of collateral, discount | Fair Value, Measurements, Nonrecurring | Minimum |  |
Quantitative information |  |
Loans held-for-investment, measurement input | 10.00% | 8.00%
Discount | Significant Unobservable Inputs (Level 3) | Fair value of collateral, discount | Fair Value, Measurements, Nonrecurring | Maximum |  |
Quantitative information |  |
Loans held-for-investment, measurement input | 20.00% | 20.00%
Selling cost | Significant Unobservable Inputs (Level 3) | Fair value of property, selling cost | Fair Value, Measurements, Nonrecurring |  |
Quantitative information |  |
Loans held-for-investment, measurement input | 8.00% |
OREO, measurement input |  | 0.08
Selling cost | Significant Unobservable Inputs (Level 3) | Fair value of property, selling cost | Fair Value, Measurements, Nonrecurring | Weighted Average |  |
Quantitative information |  |
Loans held-for-investment, measurement input | 8.00% |
OREO, measurement input |  | 0.08
Derivatives not designated as hedging instruments |  |
Quantitative information |  |
Derivative assets - Fair value | $ 708,546 | $ 330,316
Derivatives not designated as hedging instruments | Equity contracts |  |
Quantitative information |  |
Derivative assets - Fair value | $ 12,765 | $ 1,414

X
- Definition Equity Contracts, Measurement Input + References No definition available. + Details
Name: | ewbc_EquityContractsMeasurementInput
Namespace Prefix: | ewbc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Loans Receivable, Measurement Input + References No definition available. + Details
Name: | ewbc_LoansReceivableMeasurementInput
Namespace Prefix: | ewbc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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 -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
Name: | us-gaap_AssetsFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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://fasb.org/us-gaap/role/ref/legacyRef -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
- 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_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems
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 -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -URI http://asc.fasb.org/subtopic&trid=2196772 + Details
Name: | us-gaap_LoansReceivableFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Value of input used to measure real estate owned by financial institution by financial institution which is not directly related to its business. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
Name: | us-gaap_OtherRealEstateOwnedMeasurementInput
Namespace Prefix: | us-gaap_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

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

X
- Details
Name: | us-gaap_ValuationTechniqueAxis=us-gaap_IncomeApproachValuationTechniqueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ValuationTechniqueAxis=ewbc_ValuationTechniqueFairValueOfCollateralDiscountMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ValuationTechniqueAxis=ewbc_ValuationTechniqueFairValueOfValuationTechniqueFairValueOfPropertySellingCostMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ValuationTechniqueAxis=ewbc_ValuationTechniqueFairValueOfCollateralContractValueMember
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_OtherNonperformingAssetsMember
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_ValuationTechniqueAxis=ewbc_ValuationTechniqueIndividualAnalysisMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | us-gaap_MeasurementInputTypeAxis=us-gaap_MeasurementInputPriceVolatilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ValuationTechniqueAxis=ewbc_BlackScholesOptionPricingModelMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_WeightedAverageMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MeasurementInputTypeAxis=us-gaap_MeasurementInputDiscountForLackOfMarketabilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MeasurementInputTypeAxis=us-gaap_MeasurementInputDiscountRateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MeasurementInputTypeAxis=us-gaap_MeasurementInputCostToSellMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_HedgingDesignationAxis=us-gaap_NondesignatedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |