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Fair Value Election, Credit Link, Fair Value (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Fair Value Disclosures [Abstract]
Other Borrowings, Fair Value Disclosure	$ 123,824	$ 123,116
Borrowings - Credit-Link Notes	123,700
Aggregate Unpaid Principal Balance in Excess of (Less Than) Fair Value	$ (120)	$ 1,479

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- Definition

Aggregate Unpaid Principal Balance in Excess of (Less Than) Fair Value

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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

Borrowings - Credit-Link Notes

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No definition available.

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Name:	pacw_BorrowingsCreditLinkNotes
Namespace Prefix:	pacw_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- Definition

Other Borrowings, Fair Value Disclosure

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No definition available.

+ Details

Name:	pacw_OtherBorrowingsFairValueDisclosure
Namespace Prefix:	pacw_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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No definition available.

+ Details

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