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Revenue From Contracts With Customers - Contract Balances (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Mar. 31, 2024	Sep. 30, 2023
Statement of Financial Position [Abstract]
Receivables, which are included in "Other assets"	$ 1,354	$ 1,615
Contract liabilities, which are included in "Accrued interest payable and other liabilities"	$ 401	$ 418

X

- Definition

Contract With Customer, Liabilities Reclassified to Other Assets

+ References

No definition available.

+ Details

Name:	pacw_ContractWithCustomerLiabilitiesReclassifiedtoOtherAssets
Namespace Prefix:	pacw_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Contract With Customer, Receivable Reclassified to Other Assets

+ References

No definition available.

+ Details

Name:	pacw_ContractWithCustomerReceivableReclassifiedtoOtherAssets
Namespace Prefix:	pacw_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

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