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Subordinated Debentures (Details) (USD $)
In Millions, unless otherwise specified
1 Months Ended 3 Months Ended
Mar. 31, 2004
Aug. 31, 2014
Mar. 31, 2015
PPBI Trust I      
Subordinated Debentures      
Floating Rate Trust Preferred Securities issue amount $ 10.0us-gaap_PaymentsToAcquireTrustPreferredInvestments
/ dei_LegalEntityAxis
= ppbi_PPBITrustIMember
   
Notes      
Subordinated Debentures      
Debt issued   60.0us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= ppbi_SubordinatedNotes5.75PercentDue2024Member
 
Contribution of net proceeds from the Private Placement to the Bank to support general corporate purposes   40ppbi_ContributionToSupportGeneralCorporatePurposes
/ us-gaap_LongtermDebtTypeAxis
= ppbi_SubordinatedNotes5.75PercentDue2024Member
 
Fixed interest rate (as a percent)   5.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= ppbi_SubordinatedNotes5.75PercentDue2024Member
 
Subordinated Debentures      
Subordinated Debentures      
Floating interest rate, base rate     3-month LIBOR
Floating interest rate, basis points added to base rate (as a percent)     2.75%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SubordinatedDebtMember
Effective rate (as a percent)     3.00%us-gaap_DebtInstrumentInterestRateAtPeriodEnd
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SubordinatedDebtMember
Subordinated Debentures | PPBI Trust I      
Subordinated Debentures      
Debt issued $ 10.3us-gaap_DebtInstrumentFaceAmount
/ dei_LegalEntityAxis
= ppbi_PPBITrustIMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SubordinatedDebtMember