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Commitments and Contingencies (Narrative) (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Commitments to Extend Credit |  |
Letters of credit | $ 2,220,000 | $ 2,240,000
Allowance for Unfunded Credit Commitments | 27,500 | 33,500
Other Commitments |  |
Total | 309,616 |
Accrued Expenses And Other Liabilities |  |
Other Commitments |  |
Total | 309,600 | 182,700
Standby Letters of Credit |  |
Commitments to Extend Credit |  |
Letters of credit | 2,140,000 | 2,120,000
Commercial Letters Of Credit |  |
Commitments to Extend Credit |  |
Letters of credit | 78,900 | 124,900
Loans sold or securitized with recourse | Single Family Residential and Multi-Family Residential | Loans Sold or Securitized with Recourse |  |
Commitments to Extend Credit |  |
Allowance for Unfunded Credit Commitments | $ 29 | $ 88

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- Definition Reflects the Allowance for Unfunded Credit Commitments + 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 The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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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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- Definition Minimum amount of other commitment not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in the taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
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- Details
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
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- Details
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Namespace Prefix: |
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- Details
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