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Investment Securities (Details 3) (USD $)
Mar. 31, 2015
Dec. 31, 2014
Mar. 31, 2014
Investment securities available for sale, Amortized Cost      
More than One Year to Five Years $ 21,295,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost    
More than Five Years to Ten Years 63,902,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost    
More than Ten Years 192,615,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost    
Total 278,278,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAmortizedCost    
One Year or Less 466,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost    
Investment securities available for sale, Fair Value      
More than One Year to Five Years 21,331,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue    
More than Five Years to Ten Years 64,747,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue    
More than Ten Years 193,913,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue    
Total 280,461,000us-gaap_AvailableForSaleSecurities 201,638,000us-gaap_AvailableForSaleSecurities 202,142,000us-gaap_AvailableForSaleSecurities
One Year or Less 470,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue    
Stock, Fair Value      
FHLB stock 21,900,000us-gaap_FederalHomeLoanBankStock    
FRB stock 5,400,000us-gaap_FederalReserveBankStock    
Accumulated other comprehensive income (loss) 2,200,000ppbi_AccumulatedOtherComprehensiveIncomeLossBeforeTaxAmount 880,000ppbi_AccumulatedOtherComprehensiveIncomeLossBeforeTaxAmount  
Accumulated other comprehensive income, net of tax 1,285,000us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax 518,000us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax (1,084,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Municipal bonds      
Investment securities available for sale, Amortized Cost      
More than One Year to Five Years 21,044,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost
/ us-gaap_DebtSecurityAxis
= us-gaap_MunicipalBondsMember		    
More than Five Years to Ten Years 35,914,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost
/ us-gaap_DebtSecurityAxis
= us-gaap_MunicipalBondsMember		    
More than Ten Years 46,573,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost
/ us-gaap_DebtSecurityAxis
= us-gaap_MunicipalBondsMember		    
Total 103,997,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAmortizedCost
/ us-gaap_DebtSecurityAxis
= us-gaap_MunicipalBondsMember		    
One Year or Less 466,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost
/ us-gaap_DebtSecurityAxis
= us-gaap_MunicipalBondsMember		    
Investment securities available for sale, Fair Value      
More than One Year to Five Years 21,076,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue
/ us-gaap_DebtSecurityAxis
= us-gaap_MunicipalBondsMember		    
More than Five Years to Ten Years 36,539,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue
/ us-gaap_DebtSecurityAxis
= us-gaap_MunicipalBondsMember		    
More than Ten Years 47,438,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue
/ us-gaap_DebtSecurityAxis
= us-gaap_MunicipalBondsMember		    
Total 105,523,000us-gaap_AvailableForSaleSecurities
/ us-gaap_DebtSecurityAxis
= us-gaap_MunicipalBondsMember		 89,661,000us-gaap_AvailableForSaleSecurities
/ us-gaap_DebtSecurityAxis
= us-gaap_MunicipalBondsMember		 77,324,000us-gaap_AvailableForSaleSecurities
/ us-gaap_DebtSecurityAxis
= us-gaap_MunicipalBondsMember
One Year or Less 470,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue
/ us-gaap_DebtSecurityAxis
= us-gaap_MunicipalBondsMember		    
Mortgage-backed securities      
Investment securities available for sale, Amortized Cost      
More than One Year to Five Years 251,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost
/ us-gaap_DebtSecurityAxis
= us-gaap_MortgageBackedSecuritiesMember		    
More than Five Years to Ten Years 27,988,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost
/ us-gaap_DebtSecurityAxis
= us-gaap_MortgageBackedSecuritiesMember		    
More than Ten Years 146,042,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost
/ us-gaap_DebtSecurityAxis
= us-gaap_MortgageBackedSecuritiesMember		    
Total 174,281,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAmortizedCost
/ us-gaap_DebtSecurityAxis
= us-gaap_MortgageBackedSecuritiesMember		    
Investment securities available for sale, Fair Value      
More than One Year to Five Years 255,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue
/ us-gaap_DebtSecurityAxis
= us-gaap_MortgageBackedSecuritiesMember		    
More than Five Years to Ten Years 28,208,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue
/ us-gaap_DebtSecurityAxis
= us-gaap_MortgageBackedSecuritiesMember		    
More than Ten Years 146,475,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue
/ us-gaap_DebtSecurityAxis
= us-gaap_MortgageBackedSecuritiesMember		    
Total $ 174,938,000us-gaap_AvailableForSaleSecurities
/ us-gaap_DebtSecurityAxis
= us-gaap_MortgageBackedSecuritiesMember		 $ 111,977,000us-gaap_AvailableForSaleSecurities
/ us-gaap_DebtSecurityAxis
= us-gaap_MortgageBackedSecuritiesMember		 $ 124,818,000us-gaap_AvailableForSaleSecurities
/ us-gaap_DebtSecurityAxis
= us-gaap_MortgageBackedSecuritiesMember