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Commitments and Contingencies - Years In Which Commitments are Expected to be Paid (Details) $ in Thousands | Jun. 30, 2024 USD ($)
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Other Commitments [Line Items] |
Commitments to contribute capital to small business investment companies and CRA-related loan pools | $ 69,979
2024 |
Other Commitments [Line Items] |
Commitments to contribute capital to small business investment companies and CRA-related loan pools | 34,990
2025 |
Other Commitments [Line Items] |
Commitments to contribute capital to small business investment companies and CRA-related loan pools | $ 34,989

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- Definition Commitment To Contribute Capital to CRA Related Pool + References No definition available. + Details
Name: | pacw_CommitmentToContributeCapitaltoCRARelatedPool
Namespace Prefix: | pacw_
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
Name: | us-gaap_OtherCommitmentsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_OtherCommitmentsAxis=pacw_LessThanOneYearMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_OtherCommitmentsAxis=pacw_MoreThanTwelve12MonthsbutLessThanTwentyfour24MonthsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |