XML 85 R65.htm IDEA: XBRL DOCUMENT
v3.20.2

Derivatives (Derivatives Not Designated as Hedging Instruments - Commodity Contracts) (Details) MMBTU in Thousands, Boe in Thousands, $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2020 USD ($) MMBTU Boe | Jun. 30, 2019 MMBTU Boe | Dec. 31, 2019 USD ($) Boe MMBTU
Derivative [Line Items] |  |  |
Derivative assets - Fair value | $ 764,430 |  | $ 330,316
Derivative liabilities - Fair value | $ 560,169 |  | $ 256,528
Customer Counterparty | Crude oil |  |  |
Derivative [Line Items] |  |  |
Derivative, nonmonetary notional amount, energy measure | Boe | 6,155 |  | 7,811
Customer Counterparty | Natural gas |  |  |
Derivative [Line Items] |  |  |
Derivative, nonmonetary notional amount, energy measure | MMBTU | 84,957 |  | 63,773
Derivatives not designated as hedging instruments |  |  |
Derivative [Line Items] |  |  |
Derivative assets - Fair value | $ 764,185 |  | $ 330,316
Derivative liabilities - Fair value | 558,512 |  | 251,744
Derivatives not designated as hedging instruments | Commodity contracts |  |  |
Derivative [Line Items] |  |  |
Derivative assets - Fair value | 117,447 |  | 81,380
Derivative liabilities - Fair value | 138,298 |  | 80,517
Commodity contracts | Derivatives not designated as hedging instruments | Customer Counterparty | Commodity contracts |  |  |
Derivative [Line Items] |  |  |
Derivative assets - Fair value | 31,767 |  | 40,065
Derivative liabilities - Fair value | $ 104,968 |  | 42,140
Commodity contracts | Derivatives not designated as hedging instruments | Customer Counterparty | Crude oil | Written options |  |  |
Derivative [Line Items] |  |  |
Derivative, nonmonetary notional amount, energy measure | Boe | 0 | 36 |
Derivative assets - Fair value | $ 0 |  | 0
Derivative liabilities - Fair value | $ 70 |  | 30
Commodity contracts | Derivatives not designated as hedging instruments | Customer Counterparty | Crude oil | Collars |  |  |
Derivative [Line Items] |  |  |
Derivative, nonmonetary notional amount, energy measure | Boe | 1,966 | 3,174 |
Derivative assets - Fair value | $ 63 |  | 2,673
Derivative liabilities - Fair value | $ 20,463 |  | 538
Commodity contracts | Derivatives not designated as hedging instruments | Customer Counterparty | Crude oil | Swaps |  |  |
Derivative [Line Items] |  |  |
Derivative, nonmonetary notional amount, energy measure | Boe | 4,189 | 4,601 |
Derivative assets - Fair value | $ 1,273 |  | 6,949
Derivative liabilities - Fair value | $ 51,320 |  | 5,531
Commodity contracts | Derivatives not designated as hedging instruments | Customer Counterparty | Crude oil | Commodity contracts |  |  |
Derivative [Line Items] |  |  |
Derivative, nonmonetary notional amount, energy measure | Boe | 6,155 | 7,811 |
Derivative assets - Fair value | $ 1,336 |  | 9,622
Derivative liabilities - Fair value | $ 71,853 |  | 6,099
Commodity contracts | Derivatives not designated as hedging instruments | Customer Counterparty | Natural gas | Written options |  |  |
Derivative [Line Items] |  |  |
Derivative, nonmonetary notional amount, energy measure | 1,033 | 540 |
Derivative assets - Fair value | $ 0 |  | 0
Derivative liabilities - Fair value | $ 172 |  | 22
Commodity contracts | Derivatives not designated as hedging instruments | Customer Counterparty | Natural gas | Collars |  |  |
Derivative [Line Items] |  |  |
Derivative, nonmonetary notional amount, energy measure | MMBTU | 13,066 | 14,277 |
Derivative assets - Fair value | $ 881 |  | 186
Derivative liabilities - Fair value | $ 955 |  | 522
Commodity contracts | Derivatives not designated as hedging instruments | Customer Counterparty | Natural gas | Swaps |  |  |
Derivative [Line Items] |  |  |
Derivative, nonmonetary notional amount, energy measure | MMBTU | 70,858 | 48,956 |
Derivative assets - Fair value | $ 29,550 |  | 30,257
Derivative liabilities - Fair value | $ 31,988 |  | 35,497
Commodity contracts | Derivatives not designated as hedging instruments | Customer Counterparty | Natural gas | Commodity contracts |  |  |
Derivative [Line Items] |  |  |
Derivative, nonmonetary notional amount, energy measure | MMBTU | 84,957 | 63,773 |
Derivative assets - Fair value | $ 30,431 |  | 30,443
Derivative liabilities - Fair value | 33,115 |  | 36,041
Commodity contracts | Derivatives not designated as hedging instruments | Financial Counterparty | Commodity contracts |  |  |
Derivative [Line Items] |  |  |
Derivative assets - Fair value | 85,680 |  | 41,315
Derivative liabilities - Fair value | $ 33,330 |  | 38,377
Commodity contracts | Derivatives not designated as hedging instruments | Financial Counterparty | Crude oil | Purchased options |  |  |
Derivative [Line Items] |  |  |
Derivative, nonmonetary notional amount, energy measure | Boe | 0 | 36 |
Derivative assets - Fair value | $ 70 |  | 29
Derivative liabilities - Fair value | $ 0 |  | 0
Commodity contracts | Derivatives not designated as hedging instruments | Financial Counterparty | Crude oil | Collars |  |  |
Derivative [Line Items] |  |  |
Derivative, nonmonetary notional amount, energy measure | Boe | 2,218 | 3,630 |
Derivative assets - Fair value | $ 21,847 |  | 677
Derivative liabilities - Fair value | $ 1,607 |  | 2,815
Commodity contracts | Derivatives not designated as hedging instruments | Financial Counterparty | Crude oil | Swaps |  |  |
Derivative [Line Items] |  |  |
Derivative, nonmonetary notional amount, energy measure | Boe | 4,261 | 4,721 |
Derivative assets - Fair value | $ 32,875 |  | 4,516
Derivative liabilities - Fair value | $ 1,779 |  | 5,215
Commodity contracts | Derivatives not designated as hedging instruments | Financial Counterparty | Crude oil | Commodity contracts |  |  |
Derivative [Line Items] |  |  |
Derivative, nonmonetary notional amount, energy measure | Boe | 6,479 | 8,387 |
Derivative assets - Fair value | $ 54,792 |  | 5,222
Derivative liabilities - Fair value | $ 3,386 |  | 8,030
Commodity contracts | Derivatives not designated as hedging instruments | Financial Counterparty | Natural gas | Purchased options |  |  |
Derivative [Line Items] |  |  |
Derivative, nonmonetary notional amount, energy measure | 1,023 | 530 |
Derivative assets - Fair value | $ 157 |  | 21
Derivative liabilities - Fair value | $ 0 |  | 0
Commodity contracts | Derivatives not designated as hedging instruments | Financial Counterparty | Natural gas | Collars |  |  |
Derivative [Line Items] |  |  |
Derivative, nonmonetary notional amount, energy measure | MMBTU | 13,186 | 14,517 |
Derivative assets - Fair value | $ 883 |  | 471
Derivative liabilities - Fair value | $ 881 |  | 150
Commodity contracts | Derivatives not designated as hedging instruments | Financial Counterparty | Natural gas | Swaps |  |  |
Derivative [Line Items] |  |  |
Derivative, nonmonetary notional amount, energy measure | MMBTU | 78,528 | 48,779 |
Derivative assets - Fair value | $ 29,848 |  | 35,601
Derivative liabilities - Fair value | $ 29,063 |  | 30,197
Commodity contracts | Derivatives not designated as hedging instruments | Financial Counterparty | Natural gas | Commodity contracts |  |  |
Derivative [Line Items] |  |  |
Derivative, nonmonetary notional amount, energy measure | MMBTU | 92,737 | 63,826 |
Derivative assets - Fair value | $ 30,888 |  | 36,093
Derivative liabilities - Fair value | $ 29,944 |  | $ 30,347

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 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://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_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 energy measure used to calculate payments on a derivative instrument. + References No definition available. + Details
Name: | us-gaap_DerivativeNonmonetaryNotionalAmountEnergyMeasure
Namespace Prefix: | us-gaap_
Data Type: | num:energyItemType
Balance Type: | na
Period Type: | duration

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

X
- Details
Name: | srt_EnergyAxis=srt_CrudeOilMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_EnergyAxis=srt_NaturalGasReservesMember
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: |

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

X
- Details
Name: | ewbc_DerivativeRiskCategoryAxis=us-gaap_CommodityContractMember
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_CollarsMember
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: | srt_CounterpartyNameAxis=ewbc_FinancialCounterpartyMember
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: |