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Fair Value Measurements - Quantitations and Assumptions for Fair Value of Assets Serviced by Third Party (Details) - Level 3 - Fair Value, Measurements, Recurring | 3 Months Ended
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Mar. 31, 2024
Minimum | Spread to 10 Year Treasury |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |
Corporate Debt, Measurement Input | 6.30%
Minimum | Measurement Input, Discount Rate |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |
Corporate Debt, Measurement Input | 10.50%
Maximum | Spread to 10 Year Treasury |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |
Corporate Debt, Measurement Input | 8.80%
Maximum | Measurement Input, Discount Rate |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |
Corporate Debt, Measurement Input | 13.00%
Weighted Average | Spread to 10 Year Treasury |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |
Volatility | 0.076
Weighted Average | Measurement Input, Discount Rate |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |
Volatility | 0.118

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- Definition Corporate Debt, Measurement Input + References No definition available. + Details
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Namespace Prefix: | pacw_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Equity Warrants, Measurement Input + References No definition available. + Details
Name: | pacw_EquityWarrantsMeasurementInput
Namespace Prefix: | pacw_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | duration

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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
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
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- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix: |
Data Type: | na
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
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- Details
Name: | us-gaap_MeasurementInputTypeAxis=pacw_SpreadTo10YearTreasuryMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_MeasurementInputTypeAxis=us-gaap_MeasurementInputDiscountRateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
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Period Type: |

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- Details
Name: | srt_RangeAxis=srt_WeightedAverageMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |