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Securities - Schedule of the Gross Realized Gains and Tax Expense, Available-for-Sale (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2024 | Sep. 30, 2023 | Mar. 31, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Investments, Debt and Equity Securities [Abstract] |  |  |  |  |
Gross realized gains from sales | $ 145 | $ 0 |  | $ 1,979 | $ 0
Impairment write-off | 0 | 0 | $ (10,000) | 0 | (10,000)
Related tax expense (benefit) | $ 43 | $ 0 |  | $ 585 | $ (2,956)

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- Definition Debt Securities, Available-for-Sale, Impairment Write-Off on Subordinated Debt Security + References No definition available. + Details
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Balance Type: | debit
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- Definition Tax Expense on Sale of Available for Sale Debt Investment Securities + References No definition available. + Details
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Namespace Prefix: | ewbc_
Data Type: | xbrli:monetaryItemType
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- Definition Amount of realized gain on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-9 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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