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Loans Receivable and Allowance for Credit Losses - Allowance for Credit Losses Narrative (Details) $ in Millions | 9 Months Ended |
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Sep. 30, 2022 USD ($) qtr | Dec. 31, 2021 USD ($)
Financing Receivable Allowance for Credit Losses |  |
Life time loss rate, period span | qtr | 11 |
Allowance for credit losses | $ 606.6 | $ 569.1
Increase in allowance for credit losses | $ 37.5 |
US Treasury Spread |  |
Financing Receivable Allowance for Credit Losses |  |
Credit derivative, term | 10 years |

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

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

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- Definition Life Time Loss Rate, Period Span + References No definition available. + Details
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Period Type: | instant

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- Definition Term of the credit risk derivative contract, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4K -Subparagraph (a)(1) -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5708775-113959 + Details
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- 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
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- Details
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Balance Type: |
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