XML 96 R51.htm IDEA: XBRL DOCUMENT
v3.20.1

Securities (Continuous Unrealized Losses) (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Schedule of Available-for-sale Debt Securities |  |
Available-for-sale debt securities, Less than 12 Months, Fair Value | $ 765,558 | $ 1,388,661
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months | (45,457) | (18,990)
Available-for-sale debt securities, 12 Months or More, Fair Value | 40,617 | 351,048
Available-for-sale debt securities, Gross Unrealized Loss, 12 Months or More | (3,370) | (4,249)
Available-for-sale debt securities Fair Value, Total | 806,175 | 1,739,709
Available-for-sale debt securities, Gross Unrealized Loss, Total | (48,827) | (23,239)
U.S. Treasury securities |  |
Schedule of Available-for-sale Debt Securities |  |
Available-for-sale debt securities, Less than 12 Months, Fair Value |  | 0
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months |  | 0
Available-for-sale debt securities, 12 Months or More, Fair Value |  | 176,422
Available-for-sale debt securities, Gross Unrealized Loss, 12 Months or More |  | (793)
Available-for-sale debt securities Fair Value, Total |  | 176,422
Available-for-sale debt securities, Gross Unrealized Loss, Total |  | (793)
U.S. government agency and U.S. government-sponsored enterprise debt securities |  |
Schedule of Available-for-sale Debt Securities |  |
Available-for-sale debt securities, Less than 12 Months, Fair Value |  | 310,349
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months |  | (4,407)
Available-for-sale debt securities, 12 Months or More, Fair Value |  | 0
Available-for-sale debt securities, Gross Unrealized Loss, 12 Months or More |  | 0
Available-for-sale debt securities Fair Value, Total |  | 310,349
Available-for-sale debt securities, Gross Unrealized Loss, Total |  | (4,407)
U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities - Commercial mortgage-backed securities |  |
Schedule of Available-for-sale Debt Securities |  |
Available-for-sale debt securities, Less than 12 Months, Fair Value | 116,225 | 204,675
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months | (2,277) | (2,346)
Available-for-sale debt securities, 12 Months or More, Fair Value | 19,252 | 108,314
Available-for-sale debt securities, Gross Unrealized Loss, 12 Months or More | (1,891) | (2,548)
Available-for-sale debt securities Fair Value, Total | 135,477 | 312,989
Available-for-sale debt securities, Gross Unrealized Loss, Total | (4,168) | (4,894)
U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities - Residential mortgage-backed securities |  |
Schedule of Available-for-sale Debt Securities |  |
Available-for-sale debt securities, Less than 12 Months, Fair Value | 192,572 | 325,354
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months | (2,408) | (1,234)
Available-for-sale debt securities, 12 Months or More, Fair Value | 193 | 34,337
Available-for-sale debt securities, Gross Unrealized Loss, 12 Months or More | (4) | (243)
Available-for-sale debt securities Fair Value, Total | 192,765 | 359,691
Available-for-sale debt securities, Gross Unrealized Loss, Total | (2,412) | (1,477)
Municipal securities |  |
Schedule of Available-for-sale Debt Securities |  |
Available-for-sale debt securities, Less than 12 Months, Fair Value | 18,705 | 31,130
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months | (1,072) | (109)
Available-for-sale debt securities, 12 Months or More, Fair Value | 0 | 0
Available-for-sale debt securities, Gross Unrealized Loss, 12 Months or More | 0 | 0
Available-for-sale debt securities Fair Value, Total | 18,705 | 31,130
Available-for-sale debt securities, Gross Unrealized Loss, Total | (1,072) | (109)
Non-agency commercial mortgage-backed securities |  |
Schedule of Available-for-sale Debt Securities |  |
Available-for-sale debt securities, Less than 12 Months, Fair Value | 31,087 | 7,914
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months | (737) | (6)
Available-for-sale debt securities, 12 Months or More, Fair Value | 0 | 0
Available-for-sale debt securities, Gross Unrealized Loss, 12 Months or More | 0 | 0
Available-for-sale debt securities Fair Value, Total | 31,087 | 7,914
Available-for-sale debt securities, Gross Unrealized Loss, Total | (737) | (6)
Non-agency residential mortgage-backed securities |  |
Schedule of Available-for-sale Debt Securities |  |
Available-for-sale debt securities, Less than 12 Months, Fair Value | 47,044 | 42,894
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months | (2,134) | (285)
Available-for-sale debt securities, 12 Months or More, Fair Value | 0 | 0
Available-for-sale debt securities, Gross Unrealized Loss, 12 Months or More | 0 | 0
Available-for-sale debt securities Fair Value, Total | 47,044 | 42,894
Available-for-sale debt securities, Gross Unrealized Loss, Total | (2,134) | (285)
Corporate debt securities |  |
Schedule of Available-for-sale Debt Securities |  |
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, 12 Months or More, Fair Value | 9,713 | 9,888
Available-for-sale debt securities, Gross Unrealized Loss, 12 Months or More | (288) | (113)
Available-for-sale debt securities Fair Value, Total | 9,713 | 9,888
Available-for-sale debt securities, Gross Unrealized Loss, Total | (288) | (113)
Foreign bonds |  |
Schedule of Available-for-sale Debt Securities |  |
Available-for-sale debt securities, Less than 12 Months, Fair Value | 49,950 | 129,074
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months | (50) | (407)
Available-for-sale debt securities, 12 Months or More, Fair Value | 0 | 9,900
Available-for-sale debt securities, Gross Unrealized Loss, 12 Months or More | 0 | (100)
Available-for-sale debt securities Fair Value, Total | 49,950 | 138,974
Available-for-sale debt securities, Gross Unrealized Loss, Total | (50) | (507)
Asset-backed securities |  |
Schedule of Available-for-sale Debt Securities |  |
Available-for-sale debt securities, Less than 12 Months, Fair Value | 50,097 | 52,565
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months | (2,657) | (902)
Available-for-sale debt securities, 12 Months or More, Fair Value | 11,459 | 12,187
Available-for-sale debt securities, Gross Unrealized Loss, 12 Months or More | (1,187) | (452)
Available-for-sale debt securities Fair Value, Total | 61,556 | 64,752
Available-for-sale debt securities, Gross Unrealized Loss, Total | (3,844) | (1,354)
Collateralized loan obligations (“CLOs”) |  |
Schedule of Available-for-sale Debt Securities |  |
Available-for-sale debt securities, Less than 12 Months, Fair Value | 259,878 | 284,706
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months | (34,122) | (9,294)
Available-for-sale debt securities, 12 Months or More, Fair Value | 0 | 0
Available-for-sale debt securities, Gross Unrealized Loss, 12 Months or More | 0 | 0
Available-for-sale debt securities Fair Value, Total | 259,878 | 284,706
Available-for-sale debt securities, Gross Unrealized Loss, Total | $ (34,122) | $ (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: |