Financing Receivable Recorded Investment Nonaccrual Status Current

No definition available.

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

- Definition

Financing receivable recorded investment 30 to 89 days past due.

+ References

No definition available.

+ Details

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

- Definition

Undiscounted Cash Flows Not Expected to be collected

+ References

No definition available.

+ Details

Name:	pacw_UndiscountedCashFlowsNotExpectedtobecollected
Namespace Prefix:	pacw_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

For receivables acquired in a business combination, excluding certain loans and debt securities acquired in a transfer (as defined), this element represents the fair value of the receivables acquired, by major class of receivable, such as loans, direct finance leases (as defined), and any other class of receivables.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (b)(1)

-URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4845-128472

+ Details

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

- Definition

For receivables acquired in a business combination, excluding certain loans and debt securities acquired in a transfer (as defined), this element represents the gross contractual amounts receivable, by major class of receivable, such as loans, direct finance leases (as defined), and any other class of receivables.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (b)(2)

-URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4845-128472

+ Details

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

- Details

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

- Definition

Reflects the amount of the write-down related to a troubled debt restructuring.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 40

-Section 50

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=25495931&loc=d3e18845-111554

+ Details

Name:	us-gaap_FinancingReceivablesImpairedTroubledDebtRestructuringWriteDown
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4428-111522

+ Details

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

Loans and Credit Quality (Details Textual) (USD $)				3 Months Ended	6 Months Ended
Loans and Credit Quality (Details Textual) (USD $)	Jun. 30, 2014	Dec. 31, 2013	Dec. 31, 2013 Commercial Real Estate Construction Financing Receivable [Member]	Jun. 30, 2013 NonCovered [Member]	Jun. 30, 2014 NonCovered [Member]	Jun. 30, 2013 NonCovered [Member]	Dec. 31, 2013 NonCovered [Member]	Jun. 30, 2014 NonCovered [Member] Commercial Real Estate Construction Financing Receivable [Member]	Dec. 31, 2013 NonCovered [Member] Commercial Real Estate Construction Financing Receivable [Member]	Jun. 30, 2014 Nonperforming Financing Receivable [Member] Non Purchased Credit Impaired Loans and Leases [Member]	Dec. 31, 2013 Nonperforming Financing Receivable [Member] Non Purchased Credit Impaired Loans and Leases [Member]	Jun. 30, 2014 Nonperforming Financing Receivable [Member] Non Purchased Credit Impaired Loans and Leases [Member] Commercial Real Estate Construction Financing Receivable [Member]	Dec. 31, 2013 Nonperforming Financing Receivable [Member] Non Purchased Credit Impaired Loans and Leases [Member] Commercial Real Estate Construction Financing Receivable [Member]	Apr. 07, 2014 Capitalsource, Inc. [Member] NonCovered [Member]	Apr. 07, 2014 Capitalsource, Inc. [Member] Covered [Member]
Financing Receivable, Impaired [Line Items]
Business Combination, Acquired Receivables, Fair Value														$ 6,800,000,000	$ 100,000,000
Business Combination, Acquired Receivables, Gross Contractual Amount														9,400,000,000
Loans and Leases Receivable, Gross		3,929,556,000	148,898,000	3,926,230,000	10,791,669,000	3,926,230,000	3,929,556,000	226,558,000	148,898,000	96,802,000	46,774,000	2,737,000	2,830,000
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down				1,100,000	200,000	1,000,000
Financing Receivable Recorded Investment Thirty to Eighty Nine Days Past Due	9,000,000	4,000,000			12,121,000		23,897,000
Financing Receivable Recorded Investment Nonaccrual Status Current	66,000,000	37,300,000
Undiscounted Cash Flows Not Expected to be collected														$ 839,800,000