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v3.23.1

Basis of Presentation (Details) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2023 USD ($) trust | Mar. 31, 2022 USD ($)
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |
Number of wholly-owned subsidiaries that are statutory business trusts (the Trusts) | trust | 6 |
Net change in short-term borrowings | $ | $ 4,500,017 | $ (31)

X
- Definition Represents the number of wholly owned subsidiaries of the entity that are statutory business trusts, which are not consolidated. + References No definition available. + Details
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Namespace Prefix: | ewbc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- References No definition available. + Details
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Balance Type: | na
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X
- Definition The net cash inflow or outflow for borrowing having initial term of repayment within one year or the normal operating cycle, if longer. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration