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Commitments and Contingencies - Narrative (Details) - USD ($) $ in Millions | Mar. 31, 2025 | Dec. 31, 2024
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Commitments and Contingencies Disclosure [Abstract] |  |
Commitment to contribute capital | $ 84.7 | $ 79.7

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- Definition Commitment To Contribute Capital + References No definition available. + Details
Name: | pacw_CommitmentToContributeCapital
Namespace Prefix: | pacw_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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