XML 146 R73.htm IDEA: XBRL DOCUMENT
v3.19.3.a.u2

Securities (Continuous Unrealized Losses) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale debt securities, Less than 12 Months, Fair Value | $ 1,388,661 | $ 163,128
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months | (18,990) | (1,518)
Available-for-sale debt securities, More than 12 Months, Fair Value | 351,048 | 2,087,534
Available-for-sale debt securities, Gross Unrealized Loss, More than 12 Months | (4,249) | (69,249)
Available-for-sale debt securities, Fair Value, Total | 1,739,709 | 2,250,662
Available-for-sale debt securities, Gross Unrealized Loss, Total | (23,239) | (70,767)
U.S. Treasury securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale debt securities, Less than 12 Months, Fair Value | 0 | 0
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months | 0 | 0
Available-for-sale debt securities, More than 12 Months, Fair Value | 176,422 | 516,520
Available-for-sale debt securities, Gross Unrealized Loss, More than 12 Months | (793) | (12,899)
Available-for-sale debt securities, Fair Value, Total | 176,422 | 516,520
Available-for-sale debt securities, Gross Unrealized Loss, Total | (793) | (12,899)
U.S. government agency and U.S. government sponsored enterprise debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale debt securities, Less than 12 Months, Fair Value | 310,349 | 22,755
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months | (4,407) | (238)
Available-for-sale debt securities, More than 12 Months, Fair Value | 0 | 159,814
Available-for-sale debt securities, Gross Unrealized Loss, More than 12 Months | 0 | (2,456)
Available-for-sale debt securities, Fair Value, Total | 310,349 | 182,569
Available-for-sale debt securities, Gross Unrealized Loss, Total | (4,407) | (2,694)
U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities - Commercial mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale debt securities, Less than 12 Months, Fair Value | 204,675 | 26,886
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months | (2,346) | (245)
Available-for-sale debt securities, More than 12 Months, Fair Value | 108,314 | 274,666
Available-for-sale debt securities, Gross Unrealized Loss, More than 12 Months | (2,548) | (12,449)
Available-for-sale debt securities, Fair Value, Total | 312,989 | 301,552
Available-for-sale debt securities, Gross Unrealized Loss, Total | (4,894) | (12,694)
U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities - Residential mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale debt securities, Less than 12 Months, Fair Value | 325,354 | 75,675
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months | (1,234) | (491)
Available-for-sale debt securities, More than 12 Months, Fair Value | 34,337 | 653,660
Available-for-sale debt securities, Gross Unrealized Loss, More than 12 Months | (243) | (14,061)
Available-for-sale debt securities, Fair Value, Total | 359,691 | 729,335
Available-for-sale debt securities, Gross Unrealized Loss, Total | (1,477) | (14,552)
Municipal securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale debt securities, Less than 12 Months, Fair Value | 31,130 | 9,458
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months | (109) | (104)
Available-for-sale debt securities, More than 12 Months, Fair Value | 0 | 30,295
Available-for-sale debt securities, Gross Unrealized Loss, More than 12 Months | 0 | (928)
Available-for-sale debt securities, Fair Value, Total | 31,130 | 39,753
Available-for-sale debt securities, Gross Unrealized Loss, Total | (109) | (1,032)
Non-agency commercial mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale debt securities, Less than 12 Months, Fair Value | 7,914 |
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months | (6) |
Available-for-sale debt securities, More than 12 Months, Fair Value | 0 |
Available-for-sale debt securities, Gross Unrealized Loss, More than 12 Months | 0 |
Available-for-sale debt securities, Fair Value, Total | 7,914 |
Available-for-sale debt securities, Gross Unrealized Loss, Total | (6) |
Non-agency residential mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale debt securities, Less than 12 Months, Fair Value | 42,894 | 3,067
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months | (285) | (19)
Available-for-sale debt securities, More than 12 Months, Fair Value | 0 | 3,949
Available-for-sale debt securities, Gross Unrealized Loss, More than 12 Months | 0 | (166)
Available-for-sale debt securities, Fair Value, Total | 42,894 | 7,016
Available-for-sale debt securities, Gross Unrealized Loss, Total | (285) | (185)
Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale debt securities, Less than 12 Months, Fair Value | 0 | 10,869
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months | 0 | (381)
Available-for-sale debt securities, More than 12 Months, Fair Value | 9,888 | 0
Available-for-sale debt securities, Gross Unrealized Loss, More than 12 Months | (113) | 0
Available-for-sale debt securities, Fair Value, Total | 9,888 | 10,869
Available-for-sale debt securities, Gross Unrealized Loss, Total | (113) | (381)
Foreign bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale debt securities, Less than 12 Months, Fair Value | 129,074 | 14,418
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months | (407) | (40)
Available-for-sale debt securities, More than 12 Months, Fair Value | 9,900 | 448,630
Available-for-sale debt securities, Gross Unrealized Loss, More than 12 Months | (100) | (26,290)
Available-for-sale debt securities, Fair Value, Total | 138,974 | 463,048
Available-for-sale debt securities, Gross Unrealized Loss, Total | (507) | $ (26,330)
Asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale debt securities, Less than 12 Months, Fair Value | 52,565 |
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months | (902) |
Available-for-sale debt securities, More than 12 Months, Fair Value | 12,187 |
Available-for-sale debt securities, Gross Unrealized Loss, More than 12 Months | (452) |
Available-for-sale debt securities, Fair Value, Total | 64,752 |
Available-for-sale debt securities, Gross Unrealized Loss, Total | (1,354) |
Collateralized loan obligations (“CLOs”) |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale debt securities, Less than 12 Months, Fair Value | 284,706 |
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months | (9,294) |
Available-for-sale debt securities, More than 12 Months, Fair Value | 0 |
Available-for-sale debt securities, Gross Unrealized Loss, More than 12 Months | 0 |
Available-for-sale debt securities, Fair Value, Total | 284,706 |
Available-for-sale debt securities, Gross Unrealized Loss, Total | $ (9,294) |

X
- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118955579&loc=SL82922890-210455 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27337-111563 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=118942371&loc=SL82922954-210456 + Details
Name: | us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118955579&loc=SL82922890-210455 + Details
Name: | us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for less than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118955579&loc=SL82922890-210455 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=118942371&loc=SL82922954-210456 + Details
Name: | us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for less than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118955579&loc=SL82922890-210455 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27337-111563 + Details
Name: | us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position without allowance for credit loss. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 4 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=118955579&loc=SL82922888-210455 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=118942371&loc=SL82922954-210456 + Details
Name: | us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPosition
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 4 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=118955579&loc=SL82922888-210455 + Details
Name: | us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss
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_ScheduleOfAvailableForSaleSecuritiesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_USTreasurySecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=ewbc_CommercialMortgageBackedSecuritiesIssuedByUSGovernmentAgenciesAndGovernmentSponsoredEnterpriseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=ewbc_ResidentialMortgageBackedSecuritiesIssuedByUSGovernmentAgenciesAndGovernmentSponsoredEnterpriseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_USStatesAndPoliticalSubdivisionsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_CommercialMortgageBackedSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_ResidentialMortgageBackedSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_CorporateDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=ewbc_ForeignGovernmentAndCorporateDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_AssetBackedSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_CollateralizedLoanObligationsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |