Loans And Leases Net Of Discounts Covered

No definition available.

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

- Details

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

- Definition

Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for 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 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.7(d))

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 7

-Subparagraph d

-Article 9

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (b)(1)(ii)

-URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 6

-Section L

-Subsection 1

+ Details

Name:	us-gaap_LoansAndLeasesReceivableAllowance
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of allowance for loan and lease losses covered by loss sharing agreements.

+ References

No definition available.

+ Details

Name:	us-gaap_LoansAndLeasesReceivableAllowanceCovered
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of deferred interest and fee income, unamortized costs incurred to originate loans and leases, unamortized loan commitments and loan syndication fees, and premiums over or discounts from face amounts of acquired loans. Excludes amounts for 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 50

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5074-111524

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 20

-Section 50

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6378556&loc=d3e10152-111534

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 30

-Section 50

-Paragraph 4

-Subparagraph (a)(4)

-URI http://asc.fasb.org/extlink&oid=25496975&loc=d3e45377-112738

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.7)

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 7

-Article 9

+ Details

Name:	us-gaap_LoansAndLeasesReceivableDeferredIncome
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- 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

+ Details

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

- Definition

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

+ References

+ Details

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

- Definition

Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans held for sale.

+ 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

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.7)

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

+ Details

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

- Definition

Net carrying amount of loans and leases receivable covered by loss sharing agreements.

+ References

No definition available.

+ Details

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

- Definition

Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums over and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes loans and leases covered under loss sharing agreements.

+ References

No definition available.

+ Details

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

- Details

Name:	us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis=pacw_NonCoveredMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis=pacw_NonPCIandPCILoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis=pacw_PurchasedCreditImpairedLoansandLeasesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=pacw_RealEstateConstructionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_CommercialPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_ConsumerPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_MortgageLoansOnRealEstateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Loans and Credit Quality (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014	Dec. 31, 2013
Financing Receivable, Recorded Investment [Line Items]
Non-PCI loans and leases	$ 12,047,946	$ 11,904,684
PCI loans	254,285	290,791
Loans and Leases Receivable, Deferred Income	(30,126)	(22,252)
Loans held for investment, net	12,272,166	11,882,432	4,161,067
Loans and Leases Receivable, Allowance	(92,378)		(81,180)
Loans and leases, net	12,179,788	11,797,977
Loans and Leases Receivable, Net Reported Amount, Covered	241,587	276,792
Total loans and leases, net	12,179,788	11,797,977	4,079,887
Mortgage Loans on Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-PCI loans and leases	5,828,439	5,607,316
PCI loans	226,502	256,489
Loans and Leases Receivable, Allowance	(30,911)		(24,352)
Real Estate Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-PCI loans and leases	333,005	316,086
PCI loans	1,897	6,924
Loans and Leases Receivable, Allowance	(2,173)		(4,103)
Commercial Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-PCI loans and leases	6,046,946	5,879,575
PCI loans	25,664	27,155
Loans and Leases Receivable, Allowance	(45,794)		(27,740)
Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-PCI loans and leases	93,902	101,707
PCI loans	283	284
Loans and Leases Receivable, Allowance	(802)		(3,785)
NonCovered [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-PCI loans and leases		11,613,832
Loans and Leases Receivable, Deferred Income	(30,065)	(22,191)
Loans held for investment, net	12,017,881	11,591,641	3,828,551
Loans and Leases Receivable, Allowance	(79,680)	(70,456)	(59,980)	(60,241)
Loans and leases, net	11,938,201	11,521,185
NonCovered [Member] \| Mortgage Loans on Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-PCI loans and leases	5,601,937	5,350,827
Loans held for investment, net	5,588,430	5,340,560	2,320,554
Loans and Leases Receivable, Allowance		(25,097)		(26,078)
NonCovered [Member] \| Real Estate Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-PCI loans and leases	331,108	309,162
Loans held for investment, net	328,709	307,135	240,073
Loans and Leases Receivable, Allowance		(4,248)		(4,298)
NonCovered [Member] \| Commercial Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-PCI loans and leases	6,021,282	5,852,420
Loans held for investment, net	6,007,067	5,842,463	1,201,142
Loans and Leases Receivable, Allowance		(39,858)		(26,921)
NonCovered [Member] \| Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-PCI loans and leases	93,619	101,423
Loans held for investment, net	93,675	101,483	66,782
Loans and Leases Receivable, Allowance		(1,253)		(2,944)
Purchased Credit Impaired Loans and Leases [Member]
Financing Receivable, Recorded Investment [Line Items]
PCI loans	254,346	290,852
Loans and Leases Receivable, Deferred Income	(61)	(61)
Loans held for investment, net	254,285	290,791	332,516
Loans and Leases Receivable, Allowance, Covered	(12,698)	(13,999)	(21,200)	(21,793)
Loans and Leases Receivable, Net Reported Amount, Covered	241,587	276,792
NonPCI and PCI Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-PCI loans and leases	$ 12,302,292