Name:	pacw_BusinessAcquisitionMeasuringPeriodOfWeightedAveragePricePerShareForFluctuatingSharesDeliverable
Namespace Prefix:	pacw_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Represents number of independent directors of the acquiree who will join the entity's board of directors upon completion of acquisition.

No definition available.

Name:	pacw_BusinessAcquisitionNumberOfIndependentDirectors
Namespace Prefix:	pacw_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

Represents the pro forma aggregate ownership percentage of the shareholders of the acquiree in the combined entity on account of acquisition.

No definition available.

Name:	pacw_BusinessAcquisitionProFormaAggregateOwnershipPercentageOfShareholdersOfAcquireeInCombinedEntity
Namespace Prefix:	pacw_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

Represents the fraction of shares of the entity that the stockholders of the acquiree would have received for each share of acquiree pursuant to business acquisition.

No definition available.

Name:	pacw_BusinessAcquisitionSharesReceivableByStockholdersOfAcquireeRatio
Namespace Prefix:	pacw_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

The pro forma consolidated assets as if the business combination or combinations had been completed at the beginning of a period.

No definition available.

Name:	pacw_BusinessAcquisitionsProFormaConsolidatedAssets
Namespace Prefix:	pacw_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

The pro forma consolidated number of branches as if the business combination or combinations had been completed at the beginning of a period.

No definition available.

Name:	pacw_BusinessAcquisitionsProFormaConsolidatedBranches
Namespace Prefix:	pacw_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

Represents the weighted average share price of the reporting entity's stock price for twenty days. This weighted average share price will be used to determine the reporting entity's common stock deliverable for each share of the acuiree's common stock as defined in the agreement.

No definition available.

Name:	pacw_BusinessAcquisitionsWeightedAverageStockPricePerAgreement
Namespace Prefix:	pacw_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

Represents the threshold average price per share for determining the number of shares of the entity's common stock deliverable for each share of acquiree which will remain fixed.

No definition available.

Name:	pacw_BusinessAcquisitionThresholdAveragePricePerShareForDeterminingFixedSharesDeliverable
Namespace Prefix:	pacw_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

Represents the threshold average price per share for determining the number of shares of the entity's common stock deliverable for each share of acquiree which will fluctuate.

No definition available.

Name:	pacw_BusinessAcquisitionThresholdAveragePricePerShareForDeterminingFluctuatingSharesDeliverable
Namespace Prefix:	pacw_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

Represents the number of operating branches of the entity.

No definition available.

Name:	pacw_NumberOfOperatingBranches
Namespace Prefix:	pacw_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

The total cost of the acquired entity including the cash paid to shareholders of acquired entities, fair value of debt and equity securities issued to shareholders of acquired entities, the fair value of the liabilities assumed, and direct costs of the acquisition.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141

-Paragraph 51

-Subparagraph d

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Name:	us-gaap_BusinessAcquisitionCostOfAcquiredEntityPurchasePrice
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

The amount of acquisition cost of a business combination allocated to assets acquired.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141

-Paragraph 37

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Name:	us-gaap_BusinessAcquisitionPurchasePriceAllocationAssetsAcquired
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

For an acquired entity, price of a single share of a number of saleable stocks of a company.

No definition available.

Name:	us-gaap_BusinessAcquisitionSharePrice
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

Aggregate dividends declared during the period for each share of common stock outstanding.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.3-04)

-URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187085-122770