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Investment Securities (Details 3) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Investment securities available for sale, Amortized Cost    
More than One Year to Five Years $ 12,876,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost  
More than Five Years to Ten Years 62,048,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost  
More than Ten Years 125,834,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost  
Total 200,758,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAmortizedCost  
Investment securities available for sale, Fair Value    
More than One Year to Five Years 12,889,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue  
More than Five Years to Ten Years 62,511,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue  
More than Ten Years 126,238,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue  
Total 201,638,000us-gaap_AvailableForSaleSecurities 256,089,000us-gaap_AvailableForSaleSecurities
Stock, Amortized Cost    
FHLB 8,019,000ppbi_FederalHomeLoanBankStockAmortizedCost 7,483,000ppbi_FederalHomeLoanBankStockAmortizedCost
Federal Reserve Bank/TIB 9,048,000ppbi_FederalReserveBankStockAmortizedCost 7,967,000ppbi_FederalReserveBankStockAmortizedCost
Total equities held at cost 17,067,000ppbi_FederalHomeLoanAndFederalReserveBankStockAmortizedCost 15,450,000ppbi_FederalHomeLoanAndFederalReserveBankStockAmortizedCost
Stock, Fair Value    
FHLB stock 8,019,000us-gaap_FederalHomeLoanBankStock 7,483,000us-gaap_FederalHomeLoanBankStock
FRB stock 9,048,000us-gaap_FederalReserveBankStock 7,967,000us-gaap_FederalReserveBankStock
Total equities held at cost 17,067,000us-gaap_FederalHomeLoanBankStockAndFederalReserveBankStock 15,450,000us-gaap_FederalHomeLoanBankStockAndFederalReserveBankStock
Total securities, Amortized Cost    
One Year or Less 17,067,000ppbi_InvestmentSecuritiesWithinOneYearAmortizedCost  
More than One Year to Five Years 12,876,000ppbi_InvestmentSecuritiesAfterOneThroughFiveYearsAmortizedCost  
More than Five Years to Ten Years 62,048,000ppbi_InvestmentSecuritiesAfterFiveThroughTenYearsAmortizedCost  
More than Ten Years 125,834,000ppbi_InvestmentSecuritiesAfterTenYearsAmortizedCost  
Amortized Cost 217,825,000us-gaap_Investments 276,768,000us-gaap_Investments
Total securities, Fair Value    
One Year or Less 17,067,000ppbi_InvestmentSecuritiesWithinOneYearFairValue  
More than One Year to Five Years 12,889,000ppbi_InvestmentSecuritiesAfterOneThroughFiveYearsFairValue  
More than Five Years to Ten Years 62,511,000ppbi_InvestmentSecuritiesAfterFiveThroughTenYearsFairValue  
More than Ten Years 126,238,000ppbi_InvestmentSecuritiesAfterTenYearsFairValue  
Estimated Fair Value 218,705,000us-gaap_InvestmentsFairValueDisclosure 271,539,000us-gaap_InvestmentsFairValueDisclosure
Accumulated other comprehensive income (loss) 880,000ppbi_AccumulatedOtherComprehensiveIncomeLossBeforeTaxAmount 5,200,000ppbi_AccumulatedOtherComprehensiveIncomeLossBeforeTaxAmount
Accumulated other comprehensive income, net of tax 518,000us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax (3,077,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
U.S. Treasury    
Investment securities available for sale, Fair Value    
Total   81,000us-gaap_AvailableForSaleSecurities
/ us-gaap_DebtSecurityAxis
= us-gaap_USTreasurySecuritiesMember
Municipal bonds    
Investment securities available for sale, Amortized Cost    
More than One Year to Five Years 12,876,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost
/ us-gaap_DebtSecurityAxis
= us-gaap_MunicipalBondsMember		  
More than Five Years to Ten Years 38,935,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost
/ us-gaap_DebtSecurityAxis
= us-gaap_MunicipalBondsMember		  
More than Ten Years 36,788,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost
/ us-gaap_DebtSecurityAxis
= us-gaap_MunicipalBondsMember		  
Total 88,599,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAmortizedCost
/ us-gaap_DebtSecurityAxis
= us-gaap_MunicipalBondsMember		  
Investment securities available for sale, Fair Value    
More than One Year to Five Years 12,889,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue
/ us-gaap_DebtSecurityAxis
= us-gaap_MunicipalBondsMember		  
More than Five Years to Ten Years 39,391,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue
/ us-gaap_DebtSecurityAxis
= us-gaap_MunicipalBondsMember		  
More than Ten Years 37,381,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue
/ us-gaap_DebtSecurityAxis
= us-gaap_MunicipalBondsMember		  
Total 89,661,000us-gaap_AvailableForSaleSecurities
/ us-gaap_DebtSecurityAxis
= us-gaap_MunicipalBondsMember		 94,127,000us-gaap_AvailableForSaleSecurities
/ us-gaap_DebtSecurityAxis
= us-gaap_MunicipalBondsMember
Mortgage-backed securities    
Investment securities available for sale, Amortized Cost    
More than Five Years to Ten Years 23,113,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost
/ us-gaap_DebtSecurityAxis
= us-gaap_MortgageBackedSecuritiesMember		  
More than Ten Years 89,046,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost
/ us-gaap_DebtSecurityAxis
= us-gaap_MortgageBackedSecuritiesMember		  
Total 112,159,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAmortizedCost
/ us-gaap_DebtSecurityAxis
= us-gaap_MortgageBackedSecuritiesMember		  
Investment securities available for sale, Fair Value    
More than Five Years to Ten Years 23,120,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue
/ us-gaap_DebtSecurityAxis
= us-gaap_MortgageBackedSecuritiesMember		  
More than Ten Years 88,857,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue
/ us-gaap_DebtSecurityAxis
= us-gaap_MortgageBackedSecuritiesMember		  
Total $ 111,977,000us-gaap_AvailableForSaleSecurities
/ us-gaap_DebtSecurityAxis
= us-gaap_MortgageBackedSecuritiesMember		 $ 161,881,000us-gaap_AvailableForSaleSecurities
/ us-gaap_DebtSecurityAxis
= us-gaap_MortgageBackedSecuritiesMember