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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

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