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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	9 Months Ended
	Sep. 30, 2024
Minimum | Spread to 10 Year Treasury
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Corporate Debt, Measurement Input	4.00%
Minimum | Measurement Input, Discount Rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Corporate Debt, Measurement Input	7.80%
Maximum | Spread to 10 Year Treasury
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Corporate Debt, Measurement Input	9.20%
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	0.056
Weighted Average | Measurement Input, Discount Rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Volatility	0.094

X

- 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

X

- 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

X

- 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

X

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsRecurringMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_MeasurementInputTypeAxis=pacw_SpreadTo10YearTreasuryMember
Namespace Prefix:
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X

- Details

Name:	us-gaap_MeasurementInputTypeAxis=us-gaap_MeasurementInputDiscountRateMember
Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
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X

- Details

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Namespace Prefix:
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Period Type: