XML 39 R77.htm IDEA: XBRL DOCUMENT v2.4.1.9
Loans and Leases (Details 7) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
NonCovered [Member]          
Financing Receivable, Modifications [Line Items]          
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down $ 129us-gaap_FinancingReceivablesImpairedTroubledDebtRestructuringWriteDown
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pacw_NonCoveredMember		 $ 1,600us-gaap_FinancingReceivablesImpairedTroubledDebtRestructuringWriteDown
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pacw_NonCoveredMember		     $ 921us-gaap_FinancingReceivablesImpairedTroubledDebtRestructuringWriteDown
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pacw_NonCoveredMember
Financing Receivable, Modifications, Number of Contracts     72us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pacw_NonCoveredMember		 38us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pacw_NonCoveredMember		 30us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pacw_NonCoveredMember
Financing Receivable, Modifications, Pre-Modification Recorded Investment     41,030us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pacw_NonCoveredMember		 25,046us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pacw_NonCoveredMember		 26,851us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pacw_NonCoveredMember
Financing Receivable, Modifications, Post-Modification Recorded Investment     34,457us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pacw_NonCoveredMember		 25,046us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pacw_NonCoveredMember		 25,830us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pacw_NonCoveredMember
NonCovered [Member] | Consumer Portfolio Segment [Member]          
Financing Receivable, Modifications [Line Items]          
Financing Receivable, Modifications, Number of Contracts     7us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pacw_NonCoveredMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_ConsumerPortfolioSegmentMember		 2us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pacw_NonCoveredMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_ConsumerPortfolioSegmentMember		 1us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pacw_NonCoveredMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_ConsumerPortfolioSegmentMember
Financing Receivable, Modifications, Pre-Modification Recorded Investment     467us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pacw_NonCoveredMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_ConsumerPortfolioSegmentMember		 125us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pacw_NonCoveredMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_ConsumerPortfolioSegmentMember		 206us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pacw_NonCoveredMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_ConsumerPortfolioSegmentMember
Financing Receivable, Modifications, Post-Modification Recorded Investment     467us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pacw_NonCoveredMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_ConsumerPortfolioSegmentMember		 125us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pacw_NonCoveredMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_ConsumerPortfolioSegmentMember		 206us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pacw_NonCoveredMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_ConsumerPortfolioSegmentMember
Financing Receivable Troubled Debt Restructurings That Subsequently Defaulted [Member]          
Financing Receivable, Modifications [Line Items]          
Financing Receivable, Modifications, Subsequent Default, Number of Contracts     3us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pacw_FinancingReceivableTroubledDebtRestructuringsThatSubsequentlyDefaultedMember		 6us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pacw_FinancingReceivableTroubledDebtRestructuringsThatSubsequentlyDefaultedMember		 3us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pacw_FinancingReceivableTroubledDebtRestructuringsThatSubsequentlyDefaultedMember
Financing Receivable, Modifications, Subsequent Default, Recorded Investment     1,589us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pacw_FinancingReceivableTroubledDebtRestructuringsThatSubsequentlyDefaultedMember		 3,399us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pacw_FinancingReceivableTroubledDebtRestructuringsThatSubsequentlyDefaultedMember		 1,331us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pacw_FinancingReceivableTroubledDebtRestructuringsThatSubsequentlyDefaultedMember
Financing Receivable Troubled Debt Restructurings That Subsequently Defaulted [Member] | Consumer Portfolio Segment [Member]          
Financing Receivable, Modifications [Line Items]          
Financing Receivable, Modifications, Subsequent Default, Number of Contracts     0us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pacw_FinancingReceivableTroubledDebtRestructuringsThatSubsequentlyDefaultedMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_ConsumerPortfolioSegmentMember		 0us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pacw_FinancingReceivableTroubledDebtRestructuringsThatSubsequentlyDefaultedMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_ConsumerPortfolioSegmentMember		 0us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pacw_FinancingReceivableTroubledDebtRestructuringsThatSubsequentlyDefaultedMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_ConsumerPortfolioSegmentMember
Financing Receivable, Modifications, Subsequent Default, Recorded Investment     0us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pacw_FinancingReceivableTroubledDebtRestructuringsThatSubsequentlyDefaultedMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_ConsumerPortfolioSegmentMember		 0us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pacw_FinancingReceivableTroubledDebtRestructuringsThatSubsequentlyDefaultedMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_ConsumerPortfolioSegmentMember		 0us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pacw_FinancingReceivableTroubledDebtRestructuringsThatSubsequentlyDefaultedMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_ConsumerPortfolioSegmentMember
Collateralized Loan Obligations [Member] | NonCovered [Member] | Commercial Portfolio Segment [Member]          
Financing Receivable, Modifications [Line Items]          
Financing Receivable, Modifications, Number of Contracts     22us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pacw_NonCoveredMember
/ pacw_CommercialCollateralizedFinancingReceivableLoanTypeAxis
= us-gaap_CollateralizedLoanObligationsMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialPortfolioSegmentMember		 11us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pacw_NonCoveredMember
/ pacw_CommercialCollateralizedFinancingReceivableLoanTypeAxis
= us-gaap_CollateralizedLoanObligationsMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialPortfolioSegmentMember		 7us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pacw_NonCoveredMember
/ pacw_CommercialCollateralizedFinancingReceivableLoanTypeAxis
= us-gaap_CollateralizedLoanObligationsMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialPortfolioSegmentMember
Financing Receivable, Modifications, Pre-Modification Recorded Investment     12,368us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pacw_NonCoveredMember
/ pacw_CommercialCollateralizedFinancingReceivableLoanTypeAxis
= us-gaap_CollateralizedLoanObligationsMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialPortfolioSegmentMember		 5,618us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pacw_NonCoveredMember
/ pacw_CommercialCollateralizedFinancingReceivableLoanTypeAxis
= us-gaap_CollateralizedLoanObligationsMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialPortfolioSegmentMember		 1,652us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pacw_NonCoveredMember
/ pacw_CommercialCollateralizedFinancingReceivableLoanTypeAxis
= us-gaap_CollateralizedLoanObligationsMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialPortfolioSegmentMember
Financing Receivable, Modifications, Post-Modification Recorded Investment     6,336us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pacw_NonCoveredMember
/ pacw_CommercialCollateralizedFinancingReceivableLoanTypeAxis
= us-gaap_CollateralizedLoanObligationsMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialPortfolioSegmentMember		 5,618us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pacw_NonCoveredMember
/ pacw_CommercialCollateralizedFinancingReceivableLoanTypeAxis
= us-gaap_CollateralizedLoanObligationsMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialPortfolioSegmentMember		 1,652us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pacw_NonCoveredMember
/ pacw_CommercialCollateralizedFinancingReceivableLoanTypeAxis
= us-gaap_CollateralizedLoanObligationsMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialPortfolioSegmentMember
Collateralized Loan Obligations [Member] | Financing Receivable Troubled Debt Restructurings That Subsequently Defaulted [Member] | Commercial Portfolio Segment [Member]          
Financing Receivable, Modifications [Line Items]          
Financing Receivable, Modifications, Subsequent Default, Number of Contracts     1us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pacw_FinancingReceivableTroubledDebtRestructuringsThatSubsequentlyDefaultedMember
/ pacw_CommercialCollateralizedFinancingReceivableLoanTypeAxis
= us-gaap_CollateralizedLoanObligationsMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialPortfolioSegmentMember		 1us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pacw_FinancingReceivableTroubledDebtRestructuringsThatSubsequentlyDefaultedMember
/ pacw_CommercialCollateralizedFinancingReceivableLoanTypeAxis
= us-gaap_CollateralizedLoanObligationsMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialPortfolioSegmentMember		 2us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pacw_FinancingReceivableTroubledDebtRestructuringsThatSubsequentlyDefaultedMember
/ pacw_CommercialCollateralizedFinancingReceivableLoanTypeAxis
= us-gaap_CollateralizedLoanObligationsMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialPortfolioSegmentMember
Financing Receivable, Modifications, Subsequent Default, Recorded Investment     390us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pacw_FinancingReceivableTroubledDebtRestructuringsThatSubsequentlyDefaultedMember
/ pacw_CommercialCollateralizedFinancingReceivableLoanTypeAxis
= us-gaap_CollateralizedLoanObligationsMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialPortfolioSegmentMember		 419us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pacw_FinancingReceivableTroubledDebtRestructuringsThatSubsequentlyDefaultedMember
/ pacw_CommercialCollateralizedFinancingReceivableLoanTypeAxis
= us-gaap_CollateralizedLoanObligationsMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialPortfolioSegmentMember		 458us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pacw_FinancingReceivableTroubledDebtRestructuringsThatSubsequentlyDefaultedMember
/ pacw_CommercialCollateralizedFinancingReceivableLoanTypeAxis
= us-gaap_CollateralizedLoanObligationsMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialPortfolioSegmentMember
Unsecured Commercial Member [Member] | NonCovered [Member] | Commercial Portfolio Segment [Member]          
Financing Receivable, Modifications [Line Items]          
Financing Receivable, Modifications, Number of Contracts     10us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pacw_NonCoveredMember
/ pacw_CommercialCollateralizedFinancingReceivableLoanTypeAxis
= pacw_UnsecuredCommercialMemberMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialPortfolioSegmentMember		 5us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pacw_NonCoveredMember
/ pacw_CommercialCollateralizedFinancingReceivableLoanTypeAxis
= pacw_UnsecuredCommercialMemberMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialPortfolioSegmentMember		 5us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pacw_NonCoveredMember
/ pacw_CommercialCollateralizedFinancingReceivableLoanTypeAxis
= pacw_UnsecuredCommercialMemberMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialPortfolioSegmentMember
Financing Receivable, Modifications, Pre-Modification Recorded Investment     752us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pacw_NonCoveredMember
/ pacw_CommercialCollateralizedFinancingReceivableLoanTypeAxis
= pacw_UnsecuredCommercialMemberMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialPortfolioSegmentMember		 521us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pacw_NonCoveredMember
/ pacw_CommercialCollateralizedFinancingReceivableLoanTypeAxis
= pacw_UnsecuredCommercialMemberMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialPortfolioSegmentMember		 317us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pacw_NonCoveredMember
/ pacw_CommercialCollateralizedFinancingReceivableLoanTypeAxis
= pacw_UnsecuredCommercialMemberMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialPortfolioSegmentMember
Financing Receivable, Modifications, Post-Modification Recorded Investment     752us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pacw_NonCoveredMember
/ pacw_CommercialCollateralizedFinancingReceivableLoanTypeAxis
= pacw_UnsecuredCommercialMemberMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialPortfolioSegmentMember		 521us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pacw_NonCoveredMember
/ pacw_CommercialCollateralizedFinancingReceivableLoanTypeAxis
= pacw_UnsecuredCommercialMemberMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialPortfolioSegmentMember		 317us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pacw_NonCoveredMember
/ pacw_CommercialCollateralizedFinancingReceivableLoanTypeAxis
= pacw_UnsecuredCommercialMemberMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialPortfolioSegmentMember
Unsecured Commercial Member [Member] | NonCovered [Member] | Equipment Finance Commercial Financing Receivable [Member]          
Financing Receivable, Modifications [Line Items]          
Financing Receivable, Modifications, Number of Contracts     1us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pacw_NonCoveredMember
/ pacw_CommercialCollateralizedFinancingReceivableLoanTypeAxis
= pacw_UnsecuredCommercialMemberMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= pacw_EquipmentFinanceCommercialFinancingReceivableMember		    
Financing Receivable, Modifications, Pre-Modification Recorded Investment     518us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pacw_NonCoveredMember
/ pacw_CommercialCollateralizedFinancingReceivableLoanTypeAxis
= pacw_UnsecuredCommercialMemberMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= pacw_EquipmentFinanceCommercialFinancingReceivableMember		    
Financing Receivable, Modifications, Post-Modification Recorded Investment     518us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pacw_NonCoveredMember
/ pacw_CommercialCollateralizedFinancingReceivableLoanTypeAxis
= pacw_UnsecuredCommercialMemberMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= pacw_EquipmentFinanceCommercialFinancingReceivableMember		    
Unsecured Commercial Member [Member] | Financing Receivable Troubled Debt Restructurings That Subsequently Defaulted [Member] | Commercial Portfolio Segment [Member]          
Financing Receivable, Modifications [Line Items]          
Financing Receivable, Modifications, Subsequent Default, Number of Contracts     0us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pacw_FinancingReceivableTroubledDebtRestructuringsThatSubsequentlyDefaultedMember
/ pacw_CommercialCollateralizedFinancingReceivableLoanTypeAxis
= pacw_UnsecuredCommercialMemberMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialPortfolioSegmentMember		 2us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pacw_FinancingReceivableTroubledDebtRestructuringsThatSubsequentlyDefaultedMember
/ pacw_CommercialCollateralizedFinancingReceivableLoanTypeAxis
= pacw_UnsecuredCommercialMemberMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialPortfolioSegmentMember		 0us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pacw_FinancingReceivableTroubledDebtRestructuringsThatSubsequentlyDefaultedMember
/ pacw_CommercialCollateralizedFinancingReceivableLoanTypeAxis
= pacw_UnsecuredCommercialMemberMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialPortfolioSegmentMember
Financing Receivable, Modifications, Subsequent Default, Recorded Investment     0us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pacw_FinancingReceivableTroubledDebtRestructuringsThatSubsequentlyDefaultedMember
/ pacw_CommercialCollateralizedFinancingReceivableLoanTypeAxis
= pacw_UnsecuredCommercialMemberMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialPortfolioSegmentMember		 66us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pacw_FinancingReceivableTroubledDebtRestructuringsThatSubsequentlyDefaultedMember
/ pacw_CommercialCollateralizedFinancingReceivableLoanTypeAxis
= pacw_UnsecuredCommercialMemberMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialPortfolioSegmentMember		 0us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pacw_FinancingReceivableTroubledDebtRestructuringsThatSubsequentlyDefaultedMember
/ pacw_CommercialCollateralizedFinancingReceivableLoanTypeAxis
= pacw_UnsecuredCommercialMemberMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialPortfolioSegmentMember
Unsecured Commercial Member [Member] | Financing Receivable Troubled Debt Restructurings That Subsequently Defaulted [Member] | Equipment Finance Commercial Financing Receivable [Member]          
Financing Receivable, Modifications [Line Items]          
Financing Receivable, Modifications, Subsequent Default, Number of Contracts     0us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pacw_FinancingReceivableTroubledDebtRestructuringsThatSubsequentlyDefaultedMember
/ pacw_CommercialCollateralizedFinancingReceivableLoanTypeAxis
= pacw_UnsecuredCommercialMemberMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= pacw_EquipmentFinanceCommercialFinancingReceivableMember		    
Financing Receivable, Modifications, Subsequent Default, Recorded Investment     0us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pacw_FinancingReceivableTroubledDebtRestructuringsThatSubsequentlyDefaultedMember
/ pacw_CommercialCollateralizedFinancingReceivableLoanTypeAxis
= pacw_UnsecuredCommercialMemberMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= pacw_EquipmentFinanceCommercialFinancingReceivableMember		    
Asset Based [Member] | NonCovered [Member] | Commercial Portfolio Segment [Member]          
Financing Receivable, Modifications [Line Items]          
Financing Receivable, Modifications, Number of Contracts       1us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pacw_NonCoveredMember
/ pacw_CommercialCollateralizedFinancingReceivableLoanTypeAxis
= pacw_AssetBasedMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialPortfolioSegmentMember		  
Financing Receivable, Modifications, Pre-Modification Recorded Investment       2,032us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pacw_NonCoveredMember
/ pacw_CommercialCollateralizedFinancingReceivableLoanTypeAxis
= pacw_AssetBasedMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialPortfolioSegmentMember		  
Financing Receivable, Modifications, Post-Modification Recorded Investment       2,032us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pacw_NonCoveredMember
/ pacw_CommercialCollateralizedFinancingReceivableLoanTypeAxis
= pacw_AssetBasedMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialPortfolioSegmentMember		  
Asset Based [Member] | Financing Receivable Troubled Debt Restructurings That Subsequently Defaulted [Member] | Commercial Portfolio Segment [Member]          
Financing Receivable, Modifications [Line Items]          
Financing Receivable, Modifications, Subsequent Default, Number of Contracts       1us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pacw_FinancingReceivableTroubledDebtRestructuringsThatSubsequentlyDefaultedMember
/ pacw_CommercialCollateralizedFinancingReceivableLoanTypeAxis
= pacw_AssetBasedMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialPortfolioSegmentMember		  
Financing Receivable, Modifications, Subsequent Default, Recorded Investment       1,070us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pacw_FinancingReceivableTroubledDebtRestructuringsThatSubsequentlyDefaultedMember
/ pacw_CommercialCollateralizedFinancingReceivableLoanTypeAxis
= pacw_AssetBasedMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialPortfolioSegmentMember		  
SBA Financing Receivable [Member] | NonCovered [Member] | Commercial Portfolio Segment [Member]          
Financing Receivable, Modifications [Line Items]          
Financing Receivable, Modifications, Number of Contracts     3us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pacw_NonCoveredMember
/ pacw_CommercialCollateralizedFinancingReceivableLoanTypeAxis
= pacw_SBA7aFinancingReceivableMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialPortfolioSegmentMember		 4us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pacw_NonCoveredMember
/ pacw_CommercialCollateralizedFinancingReceivableLoanTypeAxis
= pacw_SBA7aFinancingReceivableMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialPortfolioSegmentMember		 4us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pacw_NonCoveredMember
/ pacw_CommercialCollateralizedFinancingReceivableLoanTypeAxis
= pacw_SBA7aFinancingReceivableMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialPortfolioSegmentMember
Financing Receivable, Modifications, Pre-Modification Recorded Investment     1,965us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pacw_NonCoveredMember
/ pacw_CommercialCollateralizedFinancingReceivableLoanTypeAxis
= pacw_SBA7aFinancingReceivableMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialPortfolioSegmentMember		 137us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pacw_NonCoveredMember
/ pacw_CommercialCollateralizedFinancingReceivableLoanTypeAxis
= pacw_SBA7aFinancingReceivableMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialPortfolioSegmentMember		 1,216us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pacw_NonCoveredMember
/ pacw_CommercialCollateralizedFinancingReceivableLoanTypeAxis
= pacw_SBA7aFinancingReceivableMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialPortfolioSegmentMember
Financing Receivable, Modifications, Post-Modification Recorded Investment     1,965us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pacw_NonCoveredMember
/ pacw_CommercialCollateralizedFinancingReceivableLoanTypeAxis
= pacw_SBA7aFinancingReceivableMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialPortfolioSegmentMember		 137us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pacw_NonCoveredMember
/ pacw_CommercialCollateralizedFinancingReceivableLoanTypeAxis
= pacw_SBA7aFinancingReceivableMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialPortfolioSegmentMember		 1,216us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pacw_NonCoveredMember
/ pacw_CommercialCollateralizedFinancingReceivableLoanTypeAxis
= pacw_SBA7aFinancingReceivableMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialPortfolioSegmentMember
SBA Financing Receivable [Member] | Financing Receivable Troubled Debt Restructurings That Subsequently Defaulted [Member] | Commercial Portfolio Segment [Member]          
Financing Receivable, Modifications [Line Items]          
Financing Receivable, Modifications, Subsequent Default, Number of Contracts     1us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pacw_FinancingReceivableTroubledDebtRestructuringsThatSubsequentlyDefaultedMember
/ pacw_CommercialCollateralizedFinancingReceivableLoanTypeAxis
= pacw_SBA7aFinancingReceivableMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialPortfolioSegmentMember		 0us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pacw_FinancingReceivableTroubledDebtRestructuringsThatSubsequentlyDefaultedMember
/ pacw_CommercialCollateralizedFinancingReceivableLoanTypeAxis
= pacw_SBA7aFinancingReceivableMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialPortfolioSegmentMember		 1us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pacw_FinancingReceivableTroubledDebtRestructuringsThatSubsequentlyDefaultedMember
/ pacw_CommercialCollateralizedFinancingReceivableLoanTypeAxis
= pacw_SBA7aFinancingReceivableMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialPortfolioSegmentMember
Financing Receivable, Modifications, Subsequent Default, Recorded Investment     1,144us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pacw_FinancingReceivableTroubledDebtRestructuringsThatSubsequentlyDefaultedMember
/ pacw_CommercialCollateralizedFinancingReceivableLoanTypeAxis
= pacw_SBA7aFinancingReceivableMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialPortfolioSegmentMember		 0us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pacw_FinancingReceivableTroubledDebtRestructuringsThatSubsequentlyDefaultedMember
/ pacw_CommercialCollateralizedFinancingReceivableLoanTypeAxis
= pacw_SBA7aFinancingReceivableMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialPortfolioSegmentMember		 873us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pacw_FinancingReceivableTroubledDebtRestructuringsThatSubsequentlyDefaultedMember
/ pacw_CommercialCollateralizedFinancingReceivableLoanTypeAxis
= pacw_SBA7aFinancingReceivableMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialPortfolioSegmentMember
Commercial Real Estate Construction Financing Receivable [Member] | NonCovered [Member] | Real Estate Construction [Member]          
Financing Receivable, Modifications [Line Items]          
Financing Receivable, Modifications, Number of Contracts     4us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pacw_NonCoveredMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= pacw_RealEstateConstructionMember
/ pacw_RealEstateConstructionLoanTypeAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember		    
Financing Receivable, Modifications, Pre-Modification Recorded Investment     5,507us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pacw_NonCoveredMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= pacw_RealEstateConstructionMember
/ pacw_RealEstateConstructionLoanTypeAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember		    
Financing Receivable, Modifications, Post-Modification Recorded Investment     4,965us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pacw_NonCoveredMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= pacw_RealEstateConstructionMember
/ pacw_RealEstateConstructionLoanTypeAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember		    
Commercial Real Estate Construction Financing Receivable [Member] | Financing Receivable Troubled Debt Restructurings That Subsequently Defaulted [Member] | Real Estate Construction [Member]          
Financing Receivable, Modifications [Line Items]          
Financing Receivable, Modifications, Subsequent Default, Number of Contracts     0us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pacw_FinancingReceivableTroubledDebtRestructuringsThatSubsequentlyDefaultedMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= pacw_RealEstateConstructionMember
/ pacw_RealEstateConstructionLoanTypeAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember		    
Financing Receivable, Modifications, Subsequent Default, Recorded Investment     0us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pacw_FinancingReceivableTroubledDebtRestructuringsThatSubsequentlyDefaultedMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= pacw_RealEstateConstructionMember
/ pacw_RealEstateConstructionLoanTypeAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember		    
Residential Real Estate Construction Financing Receivable [Member] | NonCovered [Member] | Real Estate Construction [Member]          
Financing Receivable, Modifications [Line Items]          
Financing Receivable, Modifications, Number of Contracts       1us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pacw_NonCoveredMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= pacw_RealEstateConstructionMember
/ pacw_RealEstateConstructionLoanTypeAxis
= pacw_ResidentialRealEstateConstructionFinancingReceivableMember		  
Financing Receivable, Modifications, Pre-Modification Recorded Investment       390us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pacw_NonCoveredMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= pacw_RealEstateConstructionMember
/ pacw_RealEstateConstructionLoanTypeAxis
= pacw_ResidentialRealEstateConstructionFinancingReceivableMember		  
Financing Receivable, Modifications, Post-Modification Recorded Investment       390us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pacw_NonCoveredMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= pacw_RealEstateConstructionMember
/ pacw_RealEstateConstructionLoanTypeAxis
= pacw_ResidentialRealEstateConstructionFinancingReceivableMember		  
Residential Real Estate Construction Financing Receivable [Member] | Financing Receivable Troubled Debt Restructurings That Subsequently Defaulted [Member] | Real Estate Construction [Member]          
Financing Receivable, Modifications [Line Items]          
Financing Receivable, Modifications, Subsequent Default, Number of Contracts       0us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pacw_FinancingReceivableTroubledDebtRestructuringsThatSubsequentlyDefaultedMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= pacw_RealEstateConstructionMember
/ pacw_RealEstateConstructionLoanTypeAxis
= pacw_ResidentialRealEstateConstructionFinancingReceivableMember		  
Financing Receivable, Modifications, Subsequent Default, Recorded Investment       0us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pacw_FinancingReceivableTroubledDebtRestructuringsThatSubsequentlyDefaultedMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= pacw_RealEstateConstructionMember
/ pacw_RealEstateConstructionLoanTypeAxis
= pacw_ResidentialRealEstateConstructionFinancingReceivableMember		  
Real Estate Construction [Member] | NonCovered [Member] | Real Estate Construction [Member]          
Financing Receivable, Modifications [Line Items]          
Financing Receivable, Modifications, Number of Contracts         3us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pacw_NonCoveredMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= pacw_RealEstateConstructionMember
/ pacw_RealEstateConstructionLoanTypeAxis
= pacw_RealEstateConstructionMember
Financing Receivable, Modifications, Pre-Modification Recorded Investment         6,919us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pacw_NonCoveredMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= pacw_RealEstateConstructionMember
/ pacw_RealEstateConstructionLoanTypeAxis
= pacw_RealEstateConstructionMember
Financing Receivable, Modifications, Post-Modification Recorded Investment         6,919us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pacw_NonCoveredMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= pacw_RealEstateConstructionMember
/ pacw_RealEstateConstructionLoanTypeAxis
= pacw_RealEstateConstructionMember
Real Estate Construction [Member] | Financing Receivable Troubled Debt Restructurings That Subsequently Defaulted [Member] | Real Estate Construction [Member]          
Financing Receivable, Modifications [Line Items]          
Financing Receivable, Modifications, Subsequent Default, Number of Contracts         0us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pacw_FinancingReceivableTroubledDebtRestructuringsThatSubsequentlyDefaultedMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= pacw_RealEstateConstructionMember
/ pacw_RealEstateConstructionLoanTypeAxis
= pacw_RealEstateConstructionMember
Financing Receivable, Modifications, Subsequent Default, Recorded Investment         0us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pacw_FinancingReceivableTroubledDebtRestructuringsThatSubsequentlyDefaultedMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= pacw_RealEstateConstructionMember
/ pacw_RealEstateConstructionLoanTypeAxis
= pacw_RealEstateConstructionMember
Hospitality [Member] | NonCovered [Member] | Mortgage Loans on Real Estate [Member]          
Financing Receivable, Modifications [Line Items]          
Financing Receivable, Modifications, Number of Contracts     1us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pacw_NonCoveredMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_MortgageLoansOnRealEstateMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= pacw_HospitalityMember		    
Financing Receivable, Modifications, Pre-Modification Recorded Investment     1,946us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pacw_NonCoveredMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_MortgageLoansOnRealEstateMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= pacw_HospitalityMember		    
Financing Receivable, Modifications, Post-Modification Recorded Investment     1,946us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pacw_NonCoveredMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_MortgageLoansOnRealEstateMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= pacw_HospitalityMember		    
Hospitality [Member] | Financing Receivable Troubled Debt Restructurings That Subsequently Defaulted [Member] | Mortgage Loans on Real Estate [Member]          
Financing Receivable, Modifications [Line Items]          
Financing Receivable, Modifications, Subsequent Default, Number of Contracts     0us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pacw_FinancingReceivableTroubledDebtRestructuringsThatSubsequentlyDefaultedMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_MortgageLoansOnRealEstateMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= pacw_HospitalityMember		    
Financing Receivable, Modifications, Subsequent Default, Recorded Investment     0us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pacw_FinancingReceivableTroubledDebtRestructuringsThatSubsequentlyDefaultedMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_MortgageLoansOnRealEstateMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= pacw_HospitalityMember		    
SBA Loans [Member] | NonCovered [Member] | Mortgage Loans on Real Estate [Member]          
Financing Receivable, Modifications [Line Items]          
Financing Receivable, Modifications, Number of Contracts     1us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pacw_NonCoveredMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_MortgageLoansOnRealEstateMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= pacw_SBA504LoansMember		   2us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pacw_NonCoveredMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_MortgageLoansOnRealEstateMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= pacw_SBA504LoansMember
Financing Receivable, Modifications, Pre-Modification Recorded Investment     64us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pacw_NonCoveredMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_MortgageLoansOnRealEstateMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= pacw_SBA504LoansMember		   1,680us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pacw_NonCoveredMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_MortgageLoansOnRealEstateMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= pacw_SBA504LoansMember
Financing Receivable, Modifications, Post-Modification Recorded Investment     64us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pacw_NonCoveredMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_MortgageLoansOnRealEstateMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= pacw_SBA504LoansMember		   1,680us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pacw_NonCoveredMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_MortgageLoansOnRealEstateMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= pacw_SBA504LoansMember
SBA Loans [Member] | Financing Receivable Troubled Debt Restructurings That Subsequently Defaulted [Member] | Mortgage Loans on Real Estate [Member]          
Financing Receivable, Modifications [Line Items]          
Financing Receivable, Modifications, Subsequent Default, Number of Contracts     1us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pacw_FinancingReceivableTroubledDebtRestructuringsThatSubsequentlyDefaultedMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_MortgageLoansOnRealEstateMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= pacw_SBA504LoansMember		   0us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pacw_FinancingReceivableTroubledDebtRestructuringsThatSubsequentlyDefaultedMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_MortgageLoansOnRealEstateMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= pacw_SBA504LoansMember
Financing Receivable, Modifications, Subsequent Default, Recorded Investment     55us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pacw_FinancingReceivableTroubledDebtRestructuringsThatSubsequentlyDefaultedMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_MortgageLoansOnRealEstateMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= pacw_SBA504LoansMember		   0us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
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/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= pacw_SBA504LoansMember
Real Estate Mortgage Other Receivable [Member] | NonCovered [Member] | Mortgage Loans on Real Estate [Member]          
Financing Receivable, Modifications [Line Items]          
Financing Receivable, Modifications, Number of Contracts     23us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pacw_NonCoveredMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
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/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
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= pacw_NonCoveredMember
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= us-gaap_MortgageLoansOnRealEstateMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= pacw_RealEstateMortgageOtherReceivableMember		 8us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pacw_NonCoveredMember
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= us-gaap_MortgageLoansOnRealEstateMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= pacw_RealEstateMortgageOtherReceivableMember
Financing Receivable, Modifications, Pre-Modification Recorded Investment     17,443us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
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= pacw_NonCoveredMember
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= us-gaap_MortgageLoansOnRealEstateMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= pacw_RealEstateMortgageOtherReceivableMember		 16,223us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pacw_NonCoveredMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_MortgageLoansOnRealEstateMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= pacw_RealEstateMortgageOtherReceivableMember		 14,861us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
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/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= pacw_RealEstateMortgageOtherReceivableMember
Financing Receivable, Modifications, Post-Modification Recorded Investment     17,444us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pacw_NonCoveredMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_MortgageLoansOnRealEstateMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
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/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
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= us-gaap_MortgageLoansOnRealEstateMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
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/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pacw_NonCoveredMember
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/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= pacw_RealEstateMortgageOtherReceivableMember
Real Estate Mortgage Other Receivable [Member] | Financing Receivable Troubled Debt Restructurings That Subsequently Defaulted [Member] | Mortgage Loans on Real Estate [Member]          
Financing Receivable, Modifications [Line Items]          
Financing Receivable, Modifications, Subsequent Default, Number of Contracts     0us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
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/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= pacw_RealEstateMortgageOtherReceivableMember
Financing Receivable, Modifications, Subsequent Default, Recorded Investment     $ 0us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
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/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_MortgageLoansOnRealEstateMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= pacw_RealEstateMortgageOtherReceivableMember		 $ 1,844us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
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/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
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/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= pacw_RealEstateMortgageOtherReceivableMember		 $ 0us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
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