XML 64 R47.htm IDEA: XBRL DOCUMENT
v3.22.2

Securities - Continuous Unrealized Losses (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Schedule of Available-for-sale Debt Securities |  |
Available-for-sale debt securities, Less than 12 Months, Fair Value | $ 4,490,101 | $ 5,932,965
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months | (408,561) | (106,229)
Available-for-sale debt securities, 12 Months or More, Fair Value | 1,542,000 | 1,778,987
Available-for-sale debt securities, Gross Unrealized Loss, 12 Months or More | (228,797) | (66,622)
Available-for-sale debt securities fair value, Total | 6,032,101 | 7,711,952
Available-for-sale debt securities, Gross Unrealized Loss, Total | (637,358) | (172,851)
U.S. Treasury securities |  |
Schedule of Available-for-sale Debt Securities |  |
Available-for-sale debt securities, Less than 12 Months, Fair Value | 466,095 | 935,776
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months | (32,524) | (14,689)
Available-for-sale debt securities, 12 Months or More, Fair Value | 158,591 | 47,881
Available-for-sale debt securities, Gross Unrealized Loss, 12 Months or More | (19,110) | (1,998)
Available-for-sale debt securities fair value, Total | 624,686 | 983,657
Available-for-sale debt securities, Gross Unrealized Loss, Total | (51,634) | (16,687)
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 | 249,274 | 773,647
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months | (35,689) | (18,000)
Available-for-sale debt securities, 12 Months or More, Fair Value | 35,971 | 402,907
Available-for-sale debt securities, Gross Unrealized Loss, 12 Months or More | (3,529) | (16,710)
Available-for-sale debt securities fair value, Total | 285,245 | 1,176,554
Available-for-sale debt securities, Gross Unrealized Loss, Total | (39,218) | (34,710)
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 | 440,235 | 440,734
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months | (34,101) | (13,589)
Available-for-sale debt securities, 12 Months or More, Fair Value | 110,670 | 257,745
Available-for-sale debt securities, Gross Unrealized Loss, 12 Months or More | (16,327) | (15,265)
Available-for-sale debt securities fair value, Total | 550,905 | 698,479
Available-for-sale debt securities, Gross Unrealized Loss, Total | (50,428) | (28,854)
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 | 1,433,558 | 2,138,542
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months | (122,567) | (37,691)
Available-for-sale debt securities, 12 Months or More, Fair Value | 463,552 | 330,522
Available-for-sale debt securities, Gross Unrealized Loss, 12 Months or More | (64,725) | (11,444)
Available-for-sale debt securities fair value, Total | 1,897,110 | 2,469,064
Available-for-sale debt securities, Gross Unrealized Loss, Total | (187,292) | (49,135)
Municipal securities |  |
Schedule of Available-for-sale Debt Securities |  |
Available-for-sale debt securities, Less than 12 Months, Fair Value | 265,197 | 177,065
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months | (39,708) | (5,682)
Available-for-sale debt securities, 12 Months or More, Fair Value | 0 | 17,003
Available-for-sale debt securities, Gross Unrealized Loss, 12 Months or More | 0 | (606)
Available-for-sale debt securities fair value, Total | 265,197 | 194,068
Available-for-sale debt securities, Gross Unrealized Loss, Total | (39,708) | (6,288)
Non-agency commercial mortgage-backed securities |  |
Schedule of Available-for-sale Debt Securities |  |
Available-for-sale debt securities, Less than 12 Months, Fair Value | 335,199 | 301,925
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months | (28,436) | (4,158)
Available-for-sale debt securities, 12 Months or More, Fair Value | 65,175 | 40,013
Available-for-sale debt securities, Gross Unrealized Loss, 12 Months or More | (11,243) | (1,319)
Available-for-sale debt securities fair value, Total | 400,374 | 341,938
Available-for-sale debt securities, Gross Unrealized Loss, Total | (39,679) | (5,477)
Non-agency residential mortgage-backed securities |  |
Schedule of Available-for-sale Debt Securities |  |
Available-for-sale debt securities, Less than 12 Months, Fair Value | 616,819 | 707,792
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months | (67,098) | (8,966)
Available-for-sale debt securities, 12 Months or More, Fair Value | 110,170 | 6,431
Available-for-sale debt securities, Gross Unrealized Loss, 12 Months or More | (13,925) | (11)
Available-for-sale debt securities fair value, Total | 726,989 | 714,223
Available-for-sale debt securities, Gross Unrealized Loss, Total | (81,023) | (8,977)
Corporate debt securities |  |
Schedule of Available-for-sale Debt Securities |  |
Available-for-sale debt securities, Less than 12 Months, Fair Value | 295,000 | 183,916
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months | (35,503) | (3,084)
Available-for-sale debt securities, 12 Months or More, Fair Value | 236,189 | 251,494
Available-for-sale debt securities, Gross Unrealized Loss, 12 Months or More | (78,811) | (13,505)
Available-for-sale debt securities fair value, Total | 531,189 | 435,410
Available-for-sale debt securities, Gross Unrealized Loss, Total | (114,314) | (16,589)
Foreign government bonds |  |
Schedule of Available-for-sale Debt Securities |  |
Available-for-sale debt securities, Less than 12 Months, Fair Value | 18,887 | 27,097
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months | (165) | (5)
Available-for-sale debt securities, 12 Months or More, Fair Value | 67,798 | 133,279
Available-for-sale debt securities, Gross Unrealized Loss, 12 Months or More | (10,604) | (3,476)
Available-for-sale debt securities fair value, Total | 86,685 | 160,376
Available-for-sale debt securities, Gross Unrealized Loss, Total | (10,769) | (3,481)
Asset-backed securities |  |
Schedule of Available-for-sale Debt Securities |  |
Available-for-sale debt securities, Less than 12 Months, Fair Value | 57,469 | 24,885
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months | (1,888) | (301)
Available-for-sale debt securities, 12 Months or More, Fair Value | 9,881 | 0
Available-for-sale debt securities, Gross Unrealized Loss, 12 Months or More | (526) | 0
Available-for-sale debt securities fair value, Total | 67,350 | 24,885
Available-for-sale debt securities, Gross Unrealized Loss, Total | (2,414) | (301)
Collateralized loan obligations (“CLOs”) |  |
Schedule of Available-for-sale Debt Securities |  |
Available-for-sale debt securities, Less than 12 Months, Fair Value | 312,368 | 221,586
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months | (10,882) | (64)
Available-for-sale debt securities, 12 Months or More, Fair Value | 284,003 | 291,712
Available-for-sale debt securities, Gross Unrealized Loss, 12 Months or More | (9,997) | (2,288)
Available-for-sale debt securities fair value, Total | 596,371 | 513,298
Available-for-sale debt securities, Gross Unrealized Loss, Total | $ (20,879) | $ (2,352)

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 https://asc.fasb.org/extlink&oid=124269663&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 https://asc.fasb.org/extlink&oid=126970911&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 https://asc.fasb.org/extlink&oid=121590138&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 https://asc.fasb.org/extlink&oid=126970911&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 https://asc.fasb.org/extlink&oid=124269663&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 https://asc.fasb.org/extlink&oid=126970911&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 https://asc.fasb.org/extlink&oid=124269663&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 https://asc.fasb.org/extlink&oid=121590138&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 https://asc.fasb.org/extlink&oid=124269663&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 https://asc.fasb.org/extlink&oid=126970911&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 https://asc.fasb.org/extlink&oid=126970911&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 https://asc.fasb.org/extlink&oid=124269663&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 https://asc.fasb.org/extlink&oid=121590138&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 https://asc.fasb.org/extlink&oid=126970911&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 https://asc.fasb.org/extlink&oid=124269663&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_ForeignGovernmentBondsMember
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: |