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Borrowings Borrowings (Details 1) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Subordinated Borrowing [Line Items]    
Subordinated debentures $ 431,448us-gaap_SubordinatedDebt $ 433,583us-gaap_SubordinatedDebt
Subordinated Debt Trust V Due September 2033 [Member]    
Subordinated Borrowing [Line Items]    
Long-term Debt, Gross 10,310us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_StatementEquityComponentsAxis
= pacw_SubordinatedDebtTrustVDueSeptember2033Member		 10,310us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_StatementEquityComponentsAxis
= pacw_SubordinatedDebtTrustVDueSeptember2033Member
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate 3.37%us-gaap_LongTermDebtPercentageBearingFixedInterestRate
/ us-gaap_StatementEquityComponentsAxis
= pacw_SubordinatedDebtTrustVDueSeptember2033Member		 3.33%us-gaap_LongTermDebtPercentageBearingFixedInterestRate
/ us-gaap_StatementEquityComponentsAxis
= pacw_SubordinatedDebtTrustVDueSeptember2033Member
Debt Instrument Date Issued Aug. 15, 2003  
Debt Instrument, Maturity Date Sep. 17, 2033  
Debt Instrument, Basis Spread on Variable Rate 3 month LIBOR + 3.10  
Subordinated Debt Trust VI Due September 2033 [Member]    
Subordinated Borrowing [Line Items]    
Long-term Debt, Gross 10,310us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_StatementEquityComponentsAxis
= pacw_SubordinatedDebtTrustVIDueSeptember2033Member		 10,310us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_StatementEquityComponentsAxis
= pacw_SubordinatedDebtTrustVIDueSeptember2033Member
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate 3.32%us-gaap_LongTermDebtPercentageBearingFixedInterestRate
/ us-gaap_StatementEquityComponentsAxis
= pacw_SubordinatedDebtTrustVIDueSeptember2033Member		 3.29%us-gaap_LongTermDebtPercentageBearingFixedInterestRate
/ us-gaap_StatementEquityComponentsAxis
= pacw_SubordinatedDebtTrustVIDueSeptember2033Member
Debt Instrument Date Issued Sep. 03, 2003  
Debt Instrument, Maturity Date Sep. 15, 2033  
Debt Instrument, Basis Spread on Variable Rate 3 month LIBOR + 3.05  
Subordinated Debt Trust CII Due September 2033 [Member]    
Subordinated Borrowing [Line Items]    
Long-term Debt, Gross 5,155us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_StatementEquityComponentsAxis
= pacw_SubordinatedDebtTrustCIIDueSeptember2033Member		 5,155us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_StatementEquityComponentsAxis
= pacw_SubordinatedDebtTrustCIIDueSeptember2033Member
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate 3.22%us-gaap_LongTermDebtPercentageBearingFixedInterestRate
/ us-gaap_StatementEquityComponentsAxis
= pacw_SubordinatedDebtTrustCIIDueSeptember2033Member		 3.19%us-gaap_LongTermDebtPercentageBearingFixedInterestRate
/ us-gaap_StatementEquityComponentsAxis
= pacw_SubordinatedDebtTrustCIIDueSeptember2033Member
Debt Instrument Date Issued Sep. 17, 2003  
Debt Instrument, Maturity Date Sep. 17, 2033  
Debt Instrument, Basis Spread on Variable Rate 3 month LIBOR + 2.95  
Subordinated Debt Trust VII Due April 2034 [Member]    
Subordinated Borrowing [Line Items]    
Long-term Debt, Gross 61,856us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_StatementEquityComponentsAxis
= pacw_SubordinatedDebtTrustVIIDueApril2034Member		 61,856us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_StatementEquityComponentsAxis
= pacw_SubordinatedDebtTrustVIIDueApril2034Member
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate 3.00%us-gaap_LongTermDebtPercentageBearingFixedInterestRate
/ us-gaap_StatementEquityComponentsAxis
= pacw_SubordinatedDebtTrustVIIDueApril2034Member		 2.98%us-gaap_LongTermDebtPercentageBearingFixedInterestRate
/ us-gaap_StatementEquityComponentsAxis
= pacw_SubordinatedDebtTrustVIIDueApril2034Member
Debt Instrument Date Issued Feb. 05, 2004  
Debt Instrument, Maturity Date Apr. 23, 2034  
Debt Instrument, Basis Spread on Variable Rate 3 month LIBOR + 2.75  
Subordinated Debt Trust CIII Due September 2035 [Member]    
Subordinated Borrowing [Line Items]    
Long-term Debt, Gross 20,619us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_StatementEquityComponentsAxis
= pacw_SubordinatedDebtTrustCIIIDueSeptember2035Member		 20,619us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_StatementEquityComponentsAxis
= pacw_SubordinatedDebtTrustCIIIDueSeptember2035Member
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate 1.96%us-gaap_LongTermDebtPercentageBearingFixedInterestRate
/ us-gaap_StatementEquityComponentsAxis
= pacw_SubordinatedDebtTrustCIIIDueSeptember2035Member		 1.93%us-gaap_LongTermDebtPercentageBearingFixedInterestRate
/ us-gaap_StatementEquityComponentsAxis
= pacw_SubordinatedDebtTrustCIIIDueSeptember2035Member
Debt Instrument Date Issued Aug. 15, 2005  
Debt Instrument, Maturity Date Sep. 15, 2035  
Debt Instrument, Basis Spread on Variable Rate 3 month LIBOR + 1.69  
Subordinated Debt Trust FCCI Due March 2037 [Member]    
Subordinated Borrowing [Line Items]    
Long-term Debt, Gross 16,495us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_StatementEquityComponentsAxis
= pacw_SubordinatedDebtTrustFCCIDueMarch2037Member		 16,495us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_StatementEquityComponentsAxis
= pacw_SubordinatedDebtTrustFCCIDueMarch2037Member
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate 1.87%us-gaap_LongTermDebtPercentageBearingFixedInterestRate
/ us-gaap_StatementEquityComponentsAxis
= pacw_SubordinatedDebtTrustFCCIDueMarch2037Member		 1.84%us-gaap_LongTermDebtPercentageBearingFixedInterestRate
/ us-gaap_StatementEquityComponentsAxis
= pacw_SubordinatedDebtTrustFCCIDueMarch2037Member
Debt Instrument Date Issued Jan. 25, 2007  
Debt Instrument, Maturity Date Mar. 15, 2037  
Debt Instrument, Basis Spread on Variable Rate 3 month LIBOR + 1.60  
Subordinated Debt Trust FCBI Due December 2035 [Member]    
Subordinated Borrowing [Line Items]    
Long-term Debt, Gross 10,310us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_StatementEquityComponentsAxis
= pacw_SubordinatedDebtTrustFCBIDueDecember2035Member		 10,310us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_StatementEquityComponentsAxis
= pacw_SubordinatedDebtTrustFCBIDueDecember2035Member
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate 1.82%us-gaap_LongTermDebtPercentageBearingFixedInterestRate
/ us-gaap_StatementEquityComponentsAxis
= pacw_SubordinatedDebtTrustFCBIDueDecember2035Member		 1.79%us-gaap_LongTermDebtPercentageBearingFixedInterestRate
/ us-gaap_StatementEquityComponentsAxis
= pacw_SubordinatedDebtTrustFCBIDueDecember2035Member
Debt Instrument Date Issued Sep. 30, 2005  
Debt Instrument, Maturity Date Dec. 15, 2035  
Debt Instrument, Basis Spread on Variable Rate 3 month LIBOR + 1.55  
Trust Preferred Securities Two Thousand Five Series One [Member]    
Subordinated Borrowing [Line Items]    
Long-term Debt, Gross 82,475us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_StatementEquityComponentsAxis
= pacw_TrustPreferredSecuritiesTwoThousandFiveSeriesOneMember		 82,475us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_StatementEquityComponentsAxis
= pacw_TrustPreferredSecuritiesTwoThousandFiveSeriesOneMember
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate 2.22%us-gaap_LongTermDebtPercentageBearingFixedInterestRate
/ us-gaap_StatementEquityComponentsAxis
= pacw_TrustPreferredSecuritiesTwoThousandFiveSeriesOneMember		 2.19%us-gaap_LongTermDebtPercentageBearingFixedInterestRate
/ us-gaap_StatementEquityComponentsAxis
= pacw_TrustPreferredSecuritiesTwoThousandFiveSeriesOneMember
Debt Instrument Date Issued Nov. 21, 2005  
Debt Instrument, Maturity Date Dec. 15, 2035  
Debt Instrument, Basis Spread on Variable Rate 3 month LIBOR + 1.95  
Trust Preferred Securities Two Thousand Five Series Two [Member]    
Subordinated Borrowing [Line Items]    
Long-term Debt, Gross 128,866us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_StatementEquityComponentsAxis
= pacw_TrustPreferredSecuritiesTwoThousandFiveSeriesTwoMember		 128,866us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_StatementEquityComponentsAxis
= pacw_TrustPreferredSecuritiesTwoThousandFiveSeriesTwoMember
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate 2.20%us-gaap_LongTermDebtPercentageBearingFixedInterestRate
/ us-gaap_StatementEquityComponentsAxis
= pacw_TrustPreferredSecuritiesTwoThousandFiveSeriesTwoMember		 2.18%us-gaap_LongTermDebtPercentageBearingFixedInterestRate
/ us-gaap_StatementEquityComponentsAxis
= pacw_TrustPreferredSecuritiesTwoThousandFiveSeriesTwoMember
Debt Instrument Date Issued Dec. 14, 2005  
Debt Instrument, Maturity Date Jan. 30, 2036  
Debt Instrument, Basis Spread on Variable Rate 3 month LIBOR + 1.95  
Two Thousand Six One Term Debt Securitization [Member]    
Subordinated Borrowing [Line Items]    
Long-term Debt, Gross 51,545us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_StatementEquityComponentsAxis
= pacw_TwoThousandSixOneTermDebtSecuritizationMember		 51,545us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_StatementEquityComponentsAxis
= pacw_TwoThousandSixOneTermDebtSecuritizationMember
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate 2.20%us-gaap_LongTermDebtPercentageBearingFixedInterestRate
/ us-gaap_StatementEquityComponentsAxis
= pacw_TwoThousandSixOneTermDebtSecuritizationMember		 2.18%us-gaap_LongTermDebtPercentageBearingFixedInterestRate
/ us-gaap_StatementEquityComponentsAxis
= pacw_TwoThousandSixOneTermDebtSecuritizationMember
Debt Instrument Date Issued Feb. 22, 2006  
Debt Instrument, Maturity Date Apr. 30, 2036  
Debt Instrument, Basis Spread on Variable Rate 3 month LIBOR + 1.95  
Two Thousand Six Two Term Debt Securitization [Member]    
Subordinated Borrowing [Line Items]    
Long-term Debt, Gross 51,550us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_StatementEquityComponentsAxis
= pacw_TwoThousandSixTwoTermDebtSecuritizationMember		 51,550us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_StatementEquityComponentsAxis
= pacw_TwoThousandSixTwoTermDebtSecuritizationMember
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate 2.20%us-gaap_LongTermDebtPercentageBearingFixedInterestRate
/ us-gaap_StatementEquityComponentsAxis
= pacw_TwoThousandSixTwoTermDebtSecuritizationMember		 2.18%us-gaap_LongTermDebtPercentageBearingFixedInterestRate
/ us-gaap_StatementEquityComponentsAxis
= pacw_TwoThousandSixTwoTermDebtSecuritizationMember
Debt Instrument Date Issued Sep. 27, 2006  
Debt Instrument, Maturity Date Oct. 30, 2036  
Debt Instrument, Basis Spread on Variable Rate 3 month LIBOR + 1.95  
Trust Preferred Securities Two Thousand Six Series Three [Member]    
Subordinated Borrowing [Line Items]    
Long-term Debt, Gross 27,651us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_StatementEquityComponentsAxis
= pacw_TrustPreferredSecuritiesTwoThousandSixSeriesThreeMember		 [1] 31,188us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_StatementEquityComponentsAxis
= pacw_TrustPreferredSecuritiesTwoThousandSixSeriesThreeMember		 [1]
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate 2.10%us-gaap_LongTermDebtPercentageBearingFixedInterestRate
/ us-gaap_StatementEquityComponentsAxis
= pacw_TrustPreferredSecuritiesTwoThousandSixSeriesThreeMember		 2.14%us-gaap_LongTermDebtPercentageBearingFixedInterestRate
/ us-gaap_StatementEquityComponentsAxis
= pacw_TrustPreferredSecuritiesTwoThousandSixSeriesThreeMember
Debt Instrument Date Issued Sep. 29, 2006  
Debt Instrument, Maturity Date Oct. 30, 2036  
Debt Instrument, Basis Spread on Variable Rate 3 month EURIBOR + 2.05  
Trust Preferred Securities Two Thousand Six Series Four [Member]    
Subordinated Borrowing [Line Items]    
Long-term Debt, Gross 16,470us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_StatementEquityComponentsAxis
= pacw_TrustPreferredSecuritiesTwoThousandSixSeriesFourMember		 16,470us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_StatementEquityComponentsAxis
= pacw_TrustPreferredSecuritiesTwoThousandSixSeriesFourMember
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate 2.20%us-gaap_LongTermDebtPercentageBearingFixedInterestRate
/ us-gaap_StatementEquityComponentsAxis
= pacw_TrustPreferredSecuritiesTwoThousandSixSeriesFourMember		 2.18%us-gaap_LongTermDebtPercentageBearingFixedInterestRate
/ us-gaap_StatementEquityComponentsAxis
= pacw_TrustPreferredSecuritiesTwoThousandSixSeriesFourMember
Debt Instrument Date Issued Dec. 05, 2006  
Debt Instrument, Maturity Date Jan. 30, 2037  
Debt Instrument, Basis Spread on Variable Rate 3 month LIBOR + 1.95  
Trust Preferred Securities Two Thousand Six Series Five [Member]    
Subordinated Borrowing [Line Items]    
Long-term Debt, Gross 6,650us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_StatementEquityComponentsAxis
= pacw_TrustPreferredSecuritiesTwoThousandSixSeriesFiveMember		 6,650us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_StatementEquityComponentsAxis
= pacw_TrustPreferredSecuritiesTwoThousandSixSeriesFiveMember
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate 2.20%us-gaap_LongTermDebtPercentageBearingFixedInterestRate
/ us-gaap_StatementEquityComponentsAxis
= pacw_TrustPreferredSecuritiesTwoThousandSixSeriesFiveMember		 2.18%us-gaap_LongTermDebtPercentageBearingFixedInterestRate
/ us-gaap_StatementEquityComponentsAxis
= pacw_TrustPreferredSecuritiesTwoThousandSixSeriesFiveMember
Debt Instrument Date Issued Dec. 19, 2006  
Debt Instrument, Maturity Date Jan. 30, 2037  
Debt Instrument, Basis Spread on Variable Rate 3 month LIBOR + 1.95  
Two Thousand Seven One Term Debt Securitization [Member]    
Subordinated Borrowing [Line Items]    
Long-term Debt, Gross 39,177us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_StatementEquityComponentsAxis
= pacw_TrustPreferredSecuritiesTwoThousandSevenSeriesTwoMember		 39,177us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_StatementEquityComponentsAxis
= pacw_TrustPreferredSecuritiesTwoThousandSevenSeriesTwoMember
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate 2.20%us-gaap_LongTermDebtPercentageBearingFixedInterestRate
/ us-gaap_StatementEquityComponentsAxis
= pacw_TrustPreferredSecuritiesTwoThousandSevenSeriesTwoMember		 2.18%us-gaap_LongTermDebtPercentageBearingFixedInterestRate
/ us-gaap_StatementEquityComponentsAxis
= pacw_TrustPreferredSecuritiesTwoThousandSevenSeriesTwoMember
Debt Instrument Date Issued Jun. 13, 2007  
Debt Instrument, Maturity Date Jul. 30, 2037  
Debt Instrument, Basis Spread on Variable Rate 3 month LIBOR + 1.95  
Subordinated Debt [Member]    
Subordinated Borrowing [Line Items]    
Long-term Debt, Gross 539,439us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_SubordinatedDebtMember		 542,976us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_SubordinatedDebtMember
Debt Instrument, Unamortized Discount (107,991)us-gaap_DebtInstrumentUnamortizedDiscount
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_SubordinatedDebtMember		 (109,393)us-gaap_DebtInstrumentUnamortizedDiscount
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_SubordinatedDebtMember
Subordinated debentures $ 431,448us-gaap_SubordinatedDebt
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_SubordinatedDebtMember		 $ 433,583us-gaap_SubordinatedDebt
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_SubordinatedDebtMember
[1] (3) Denomination is in Euros with a value of €25.8 million.