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Loans Held for Investment (Details 2) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Accretable yield on purchased credit impaired    
Balance at the beginning of period $ 1,403us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield  
Accretable yield at acquisition 602us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldAdditions  
Accretion (77)us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldAccretion  
Disposals and other (4)ppbi_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesDisposalsAndOther  
Balance at the end of period 1,924us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield  
Canyon National    
Accretable yield on purchased credit impaired    
Balance at the beginning of period 1,351us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield
/ us-gaap_BusinessAcquisitionAxis
= ppbi_CanyonNationalBankMember
 
Accretion (47)us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldAccretion
/ us-gaap_BusinessAcquisitionAxis
= ppbi_CanyonNationalBankMember
 
Balance at the end of period 1,304us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield
/ us-gaap_BusinessAcquisitionAxis
= ppbi_CanyonNationalBankMember
 
Palm Desert National    
Accretable yield on purchased credit impaired    
Balance at the beginning of period   52us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield
/ us-gaap_BusinessAcquisitionAxis
= ppbi_PalmDesertNationalBankMember
Balance at the end of period 52us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield
/ us-gaap_BusinessAcquisitionAxis
= ppbi_PalmDesertNationalBankMember
52us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield
/ us-gaap_BusinessAcquisitionAxis
= ppbi_PalmDesertNationalBankMember
Independence Bank    
Accretable yield on purchased credit impaired    
Accretable yield at acquisition 602us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldAdditions
/ us-gaap_BusinessAcquisitionAxis
= ppbi_IndependenceBankMember
 
Accretion (30)us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldAccretion
/ us-gaap_BusinessAcquisitionAxis
= ppbi_IndependenceBankMember
 
Disposals and other (4)ppbi_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesDisposalsAndOther
/ us-gaap_BusinessAcquisitionAxis
= ppbi_IndependenceBankMember
 
Balance at the end of period $ 568us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield
/ us-gaap_BusinessAcquisitionAxis
= ppbi_IndependenceBankMember