XML 94 R76.htm IDEA: XBRL DOCUMENT
v3.21.2

Investments in Qualified Affordable Housing Partnerships, Tax Credit and Other Investments, Net and Variable Interest Entities (Investments in Tax Credit and Other Investments, Net) (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Investments in Tax Credit and Other Investments, Net, And Related Unfunded Commitments [Abstract] |  |  |  |  |
Investments in tax credit and other investments, net | $ 367,428,000 |  | $ 367,428,000 |  | $ 266,525,000
Accrued expenses and other liabilities — Unfunded commitments | 194,796,000 |  | 194,796,000 |  | 105,282,000
Unrealized gains (losses) recognized on equity securities with readily determinable fair values | (88,000) | $ 55,000 | (515,000) | $ 813,000 |
Adjustments to equity securities without readily determinable fair values | 0 | 0 | 0 | 0 |
Asset impairment charges |  |  | 4,843,000 | 0 |
Investment in tax credit and other investments |  |  |  |  |
Investments in Tax Credit and Other Investments, Net, And Related Unfunded Commitments [Abstract] |  |  |  |  |
Asset impairment charges | 0 | $ 0 |  |  |
Investment in Tax Credit and Other Investments, Multiple Credit |  |  |  |  |
Investments in Tax Credit and Other Investments, Net, And Related Unfunded Commitments [Abstract] |  |  |  |  |
Pre-tax recoveries |  |  | 1,300,000 | 259,000 |
Investment in Tax Credit and Other Investments, OTTI, Single Credit |  |  |  |  |
Investments in Tax Credit and Other Investments, Net, And Related Unfunded Commitments [Abstract] |  |  |  |  |
Asset impairment charges |  |  |  | $ 733,000 |
Tax credit investments |  |  |  |  |
Investments in Tax Credit and Other Investments, Net, And Related Unfunded Commitments [Abstract] |  |  |  |  |
Equity securities with readily determinable fair values | 26,800,000 |  | 26,800,000 |  | 31,300,000
Investments in Tax Credit and Other Investments and Other Assets |  |  |  |  |
Investments in Tax Credit and Other Investments, Net, And Related Unfunded Commitments [Abstract] |  |  |  |  |
Equity securities without readily determinable fair values | $ 29,300,000 |  | $ 29,300,000 |  | $ 23,700,000

X
- Definition Investments in Tax Credit and Other Investments, Net, And Related Unfunded Commitments + References No definition available. + Details
Name: | ewbc_InvestmentsInTaxCreditAndOtherInvestmentsNetAndRelatedUnfundedCommitmentsAbstract
Namespace Prefix: | ewbc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the net amount of investments in the projects, excluding affordable housing projects, that qualify for Community Reinvestment Act (CRA) credits or other types of tax credits. + References No definition available. + Details
Name: | ewbc_InvestmentsinTaxCreditandOtherInvestmentsNet
Namespace Prefix: | ewbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of commitment or contingent commitments to investments in certain limited partnerships that qualify for Community Reinvestment Act (CRA) credits or other types of tax credits. + References No definition available. + Details
Name: | ewbc_OtherTaxCreditInvestmentsCommitment
Namespace Prefix: | ewbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Tax Credit Investments, Pre-tax Recoveries + References No definition available. + Details
Name: | ewbc_TaxCreditInvestmentsPreTaxRecoveries
Namespace Prefix: | ewbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=123351718&loc=d3e2420-110228 + Details
Name: | us-gaap_AssetImpairmentCharges
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI), classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=123594786&loc=SL75136599-209740 + Details
Name: | us-gaap_EquitySecuritiesFvNi
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of investment in equity security without readily determinable fair value. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 321 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123583765&loc=SL75117539-209714 + Details
Name: | us-gaap_EquitySecuritiesWithoutReadilyDeterminableFairValueAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of loss from downward price adjustment on investment in equity security without readily determinable fair value. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 321 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123583765&loc=SL75117539-209714 + Details
Name: | us-gaap_EquitySecuritiesWithoutReadilyDeterminableFairValueDownwardPriceAdjustmentAnnualAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of unrealized gain (loss) on investment in marketable security. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(7)(c)) -URI http://asc.fasb.org/extlink&oid=123367319&loc=SL114868664-224227 + Details
Name: | us-gaap_MarketableSecuritiesUnrealizedGainLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=ewbc_InvestmentInTaxCreditAndOtherInvestmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=ewbc_InvestmentInTaxCreditAndOtherInvestmentsMultipleCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=ewbc_InvestmentInTaxCreditAndOtherInvestmentsOTTISingleCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BalanceSheetLocationAxis=ewbc_InvestmentsInTaxCreditAndOtherInvestmentsNetMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BalanceSheetLocationAxis=ewbc_InvestmentsInTaxCreditAndOtherInvestmentsNetAndOtherAssetsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |