XML 59 R42.htm IDEA: XBRL DOCUMENT
v3.23.1

Fair Value Measurement and Fair Value of Financial Instruments - Quantitative Information for Significant Unobservable Inputs (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Quantitative information |  |
Derivative assets - Fair value | $ 627,402 | $ 755,328
Fair Value, Measurements, Recurring |  |
Quantitative information |  |
Derivative assets - Fair value | 627,402 | 755,328
Fair Value, Measurements, Nonrecurring |  |
Quantitative information |  |
Loans held-for-investment, fair value disclosure | 15,235 | 72,614
Level 3 | Fair Value, Measurements, Recurring |  |
Quantitative information |  |
Derivative assets - Fair value | 277 | 323
Level 3 | Fair Value, Measurements, Nonrecurring |  |
Quantitative information |  |
Loans held-for-investment, fair value disclosure | 15,235 | 72,614
Level 3 | Discounted cash flows | Fair Value, Measurements, Nonrecurring |  |
Quantitative information |  |
Loans held-for-investment, fair value disclosure |  | 23,322
Level 3 | Fair value of collateral | Fair Value, Measurements, Nonrecurring |  |
Quantitative information |  |
Loans held-for-investment, fair value disclosure | $ 15,235 | 17,912
Level 3 | Fair value of property | Fair Value, Measurements, Nonrecurring |  |
Quantitative information |  |
Loans held-for-investment, fair value disclosure |  | $ 31,380
Discount | Level 3 | Discounted cash flows | Fair Value, Measurements, Nonrecurring | Minimum |  |
Quantitative information |  |
Loans held-for-investment, measurement input |  | 4.00%
Discount | Level 3 | Discounted cash flows | Fair Value, Measurements, Nonrecurring | Maximum |  |
Quantitative information |  |
Loans held-for-investment, measurement input |  | 6.00%
Discount | Level 3 | Discounted cash flows | Fair Value, Measurements, Nonrecurring | Weighted Average |  |
Quantitative information |  |
Loans held-for-investment, measurement input |  | 4.00%
Discount | Level 3 | Fair value of collateral | Fair Value, Measurements, Nonrecurring | Minimum |  |
Quantitative information |  |
Loans held-for-investment, measurement input | 15.00% | 15.00%
Discount | Level 3 | Fair value of collateral | Fair Value, Measurements, Nonrecurring | Maximum |  |
Quantitative information |  |
Loans held-for-investment, measurement input | 81.00% | 75.00%
Discount | Level 3 | Fair value of collateral | Fair Value, Measurements, Nonrecurring | Weighted Average |  |
Quantitative information |  |
Loans held-for-investment, measurement input | 35.00% | 37.00%
Selling cost | Level 3 | Fair value of property | Fair Value, Measurements, Nonrecurring |  |
Quantitative information |  |
Loans held-for-investment, measurement input |  | 8.00%
Selling cost | Level 3 | Fair value of property | Fair Value, Measurements, Nonrecurring | Weighted Average |  |
Quantitative information |  |
Loans held-for-investment, measurement input |  | 8.00%
Equity contracts | Fair Value, Measurements, Recurring |  |
Quantitative information |  |
Derivative assets - Fair value | $ 277 | $ 323
Equity contracts | Level 3 | Fair Value, Measurements, Recurring |  |
Quantitative information |  |
Derivative assets - Fair value | $ 277 | $ 323
Equity contracts | Equity volatility | Level 3 | Black-Scholes option pricing model | Fair Value, Measurements, Recurring | Minimum |  |
Quantitative information |  |
Measurement input | 43.00% | 42.00%
Equity contracts | Equity volatility | Level 3 | Black-Scholes option pricing model | Fair Value, Measurements, Recurring | Maximum |  |
Quantitative information |  |
Measurement input | 53.00% | 60.00%
Equity contracts | Equity volatility | Level 3 | Black-Scholes option pricing model | Fair Value, Measurements, Recurring | Weighted Average |  |
Quantitative information |  |
Measurement input | 47.00% | 54.00%
Equity contracts | Liquidity discount | Level 3 | Fair Value, Measurements, Recurring |  |
Quantitative information |  |
Measurement input | 47.00% | 47.00%
Equity contracts | Liquidity discount | Level 3 | Fair Value, Measurements, Recurring | Weighted Average |  |
Quantitative information |  |
Measurement input | 47.00% | 47.00%

X
- Definition Equity Contracts, Measurement Input + References No definition available. + Details
Name: | ewbc_EquityContractsMeasurementInput
Namespace Prefix: | ewbc_
Data Type: | dtr-types1: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: | dtr-types1:percentItemType
Balance Type: | na
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://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 5C -Subparagraph (SX 210.12-13C(Column F)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480032/946-320-S99-5C Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 5B -Subparagraph (SX 210.12-13B(Column E)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480032/946-320-S99-5B Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 210 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 22 -Publisher FASB -URI https://asc.fasb.org//1943274/2147483444/210-20-55-22 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483466/210-20-50-3 + 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 -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Publisher FASB -URI https://asc.fasb.org//310-10/tableOfContent + Details
Name: | us-gaap_LoansReceivableFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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_MeasurementInputTypeAxis=us-gaap_MeasurementInputDiscountRateMember
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: | srt_RangeAxis=srt_WeightedAverageMember
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_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: | us-gaap_MeasurementInputTypeAxis=us-gaap_MeasurementInputDiscountForLackOfMarketabilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |