XML 92 R73.htm IDEA: XBRL DOCUMENT
v3.25.1

Loans Receivable and Allowance for Credit Losses - Allowance for Credit Losses Narrative (Details) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2025 USD ($) quarter | Dec. 31, 2024 USD ($)
Financing Receivable Allowance for Credit Losses |  |
Life time loss rate, period span | quarter | 8 |
Allowance for credit losses | $ 775 | $ 742
Increase in allowance for credit losses | 33 |
Commercial lending |  |
Financing Receivable Allowance for Credit Losses |  |
Collateral dependent loan | 36 | 45
Consumer lending |  |
Financing Receivable Allowance for Credit Losses |  |
Collateral dependent loan | $ 21 | $ 23

X
- Definition Financing Receivable And Off Balance Sheet Credit Loss Allowance + References No definition available. + Details
Name: | ewbc_FinancingReceivableAndOffBalanceSheetCreditLossAllowance
Namespace Prefix: | ewbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Financing Receivable And Off Balance Sheet Credit Loss Allowance, Period Increase (Decrease) + References No definition available. + Details
Name: | ewbc_FinancingReceivableAndOffBalanceSheetCreditLossAllowancePeriodIncreaseDecrease
Namespace Prefix: | ewbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Financing Receivable, Collateral Dependent + References No definition available. + Details
Name: | ewbc_FinancingReceivableCollateralDependent
Namespace Prefix: | ewbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Reasonable and Supportable Forecast Period, Life Time Loss Rate, Period + References No definition available. + Details
Name: | ewbc_ReasonableAndSupportableForecasePeriodLifeTimeLossRatePeriod
Namespace Prefix: | ewbc_
Data Type: | xbrli:integerItemType
Balance Type: | na
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 Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph c -Publisher SEC Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-13 + Details
Name: | us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ConsumerPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |