XML 73 R56.htm IDEA: XBRL DOCUMENT
v3.21.2

Derivatives (Derivatives Not Designated as Hedging Instruments - Interest Rate Contracts) (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Derivative [Line Items] |  |
Derivative assets - Fair value | $ 588,582 | $ 602,754
Derivative liabilities - Fair value | 448,921 | 424,828
Derivatives not designated as hedging instruments |  |
Derivative [Line Items] |  |
Notional Amount | 21,676,672 | 21,341,158
Derivative assets - Fair value | 588,582 | 602,754
Derivative liabilities - Fair value | 447,542 | 422,729
Derivatives not designated as hedging instruments | Interest rate contracts |  |
Derivative [Line Items] |  |
Notional Amount | 17,836,695 | 18,155,678
Derivative assets - Fair value | 329,953 | 489,132
Derivative liabilities - Fair value | 227,768 | 315,834
Derivatives not designated as hedging instruments | Financial Counterparty | Interest rate contracts |  |
Derivative [Line Items] |  |
Notional Amount | 8,930,000 | 9,090,000
Interest rate contracts | Derivatives not designated as hedging instruments | Customer Counterparty | Written options |  |
Derivative [Line Items] |  |
Notional Amount | 850,152 | 957,393
Derivative assets - Fair value | 0 | 0
Derivative liabilities - Fair value | 650 | 115
Interest rate contracts | Derivatives not designated as hedging instruments | Customer Counterparty | Sold collars and corridors |  |
Derivative [Line Items] |  |
Notional Amount | 424,212 | 518,477
Derivative assets - Fair value | 3,864 | 7,673
Derivative liabilities - Fair value | 218 | 0
Interest rate contracts | Derivatives not designated as hedging instruments | Customer Counterparty | Swaps |  |
Derivative [Line Items] |  |
Notional Amount | 7,628,895 | 7,586,414
Derivative assets - Fair value | 309,520 | 479,634
Derivative liabilities - Fair value | 25,743 | 1,364
Interest rate contracts | Derivatives not designated as hedging instruments | Customer Counterparty | Interest rate contracts |  |
Derivative [Line Items] |  |
Notional Amount | 8,903,259 | 9,062,284
Derivative assets - Fair value | 313,384 | 487,307
Derivative liabilities - Fair value | 26,611 | 1,479
Interest rate contracts | Derivatives not designated as hedging instruments | Financial Counterparty | Purchased options |  |
Derivative [Line Items] |  |
Notional Amount | 850,152 | 957,393
Derivative assets - Fair value | 656 | 101
Derivative liabilities - Fair value | 0 | 15
Interest rate contracts | Derivatives not designated as hedging instruments | Financial Counterparty | Collars and corridors |  |
Derivative [Line Items] |  |
Notional Amount | 424,212 | 518,477
Derivative assets - Fair value | 214 | 0
Derivative liabilities - Fair value | 3,910 | 7,717
Interest rate contracts | Derivatives not designated as hedging instruments | Financial Counterparty | Swaps |  |
Derivative [Line Items] |  |
Notional Amount | 7,659,072 | 7,617,524
Derivative assets - Fair value | 15,699 | 1,724
Derivative liabilities - Fair value | 197,247 | 306,623
Interest rate contracts | Derivatives not designated as hedging instruments | Financial Counterparty | Interest rate contracts |  |
Derivative [Line Items] |  |
Notional Amount | 8,933,436 | 9,093,394
Derivative assets - Fair value | 16,569 | 1,825
Derivative liabilities - Fair value | $ 201,157 | $ 314,355

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 -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 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226052-175313 + Details
Name: | us-gaap_DerivativeAssetFairValueGrossAssetIncludingNotSubjectToMasterNettingArrangement
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 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/disclosureRef -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 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226052-175313 + Details
Name: | us-gaap_DerivativeLiabilityFairValueGrossLiabilityIncludingNotSubjectToMasterNettingArrangement
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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_DerivativeLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Nominal or face amount used to calculate payment on derivative. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5579245-113959 + Details
Name: | us-gaap_DerivativeNotionalAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

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

X
- Details
Name: | ewbc_DerivativeRiskCategoryAxis=us-gaap_InterestRateContractMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_CounterpartyNameAxis=ewbc_CustomerCounterpartyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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

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

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

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