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Commitments and Contingencies - Years In Which Commitments are Expected to be Paid (Details) $ in Thousands	Mar. 31, 2024 USD ($)
Other Commitments [Line Items]
Commitments to contribute capital to small business investment companies and CRA-related loan pools	$ 72,889
2024
Other Commitments [Line Items]
Commitments to contribute capital to small business investment companies and CRA-related loan pools	36,445
2025
Other Commitments [Line Items]
Commitments to contribute capital to small business investment companies and CRA-related loan pools	$ 36,444

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- Definition

Commitment To Contribute Capital to CRA Related Pool

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No definition available.

+ Details

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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

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Details

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Namespace Prefix:
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Balance Type:
Period Type:

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- Details

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