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Loans Receivable and Allowance for Credit Losses - Allowance for Credit Losses Narrative (Details) - USD ($) $ in Millions | 6 Months Ended |
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Jun. 30, 2022 | Dec. 31, 2021
Loans and Leases Receivable Disclosure [Abstract] |  |
Allowance for credit losses | $ 587.6 | $ 569.1
Increase in allowance for credit losses | $ 18.5 |

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- 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

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- 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

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- References No definition available. + Details
Name: | us-gaap_LoansAndLeasesReceivableDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration