XML 57 R46.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Fair Value Measurement and Fair Value of Financial Instruments (Details 6) - Fair Value, Measurements, Nonrecurring - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2017 | Dec. 31, 2016
Non-PCI impaired loans |  |
Quantitative information |  |
Impaired loans | $ 47,937 | $ 70,154
OREO |  |
Quantitative information |  |
OREO | 1,789 | 345
Significant Unobservable Inputs (Level 3) | Non-PCI impaired loans |  |
Quantitative information |  |
Impaired loans | 47,937 | 70,154
Significant Unobservable Inputs (Level 3) | Non-PCI impaired loans | Discounted cash flows |  |
Quantitative information |  |
Impaired loans | $ 30,563 | $ 31,835
Significant Unobservable Inputs (Level 3) | Non-PCI impaired loans | Discounted cash flows | Minimum |  |
Quantitative information |  |
Discount rate | 0.00% | 0.00%
Significant Unobservable Inputs (Level 3) | Non-PCI impaired loans | Discounted cash flows | Maximum |  |
Quantitative information |  |
Discount rate | 82.00% | 62.00%
Significant Unobservable Inputs (Level 3) | Non-PCI impaired loans | Discounted cash flows | Weighted Average |  |
Quantitative information |  |
Discount rate | 19.00% | 7.00%
Significant Unobservable Inputs (Level 3) | Non-PCI impaired loans | Market comparables |  |
Quantitative information |  |
Impaired loans | $ 17,374 | $ 38,319
Significant Unobservable Inputs (Level 3) | Non-PCI impaired loans | Market comparables | Minimum |  |
Quantitative information |  |
Discount rate | 0.00% | 0.00%
Significant Unobservable Inputs (Level 3) | Non-PCI impaired loans | Market comparables | Maximum |  |
Quantitative information |  |
Discount rate | 100.00% | 100.00%
Significant Unobservable Inputs (Level 3) | Non-PCI impaired loans | Market comparables | Weighted Average |  |
Quantitative information |  |
Discount rate | 40.00% | 18.00%
Significant Unobservable Inputs (Level 3) | OREO |  |
Quantitative information |  |
OREO | $ 1,789 | $ 345
Significant Unobservable Inputs (Level 3) | OREO | Appraisal |  |
Quantitative information |  |
OREO | $ 1,789 | $ 345
Selling cost | 8.00% | 8.00%
Significant Unobservable Inputs (Level 3) | OREO | Appraisal | Weighted Average |  |
Quantitative information |  |
Selling cost | 8.00% | 8.00%

X
- Definition Represents selling cost used as an input to measure fair value. + References No definition available. + Details
Name: | ewbc_FairValueInputsSellingCost
Namespace Prefix: | ewbc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Impaired Loans, Fair Value Disclosure + References No definition available. + Details
Name: | ewbc_ImpairedLoansFairValueDisclosure
Namespace Prefix: | ewbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
Name: | us-gaap_AssetsFairValueDisclosure
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_FairValueInputsAssetsQuantitativeInformationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
Name: | us-gaap_FairValueInputsDiscountRate
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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_FairValueByAssetClassAxis=ewbc_OtherRealEstateOwnedMember
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_RangeAxis=us-gaap_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_WeightedAverageMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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