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Deposit Accounts (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Transaction accounts      
Noninterest-bearing checking $ 456,754,000us-gaap_NoninterestBearingDepositLiabilities $ 366,755,000us-gaap_NoninterestBearingDepositLiabilities  
Interest-bearing checking 131,635,000us-gaap_InterestBearingDomesticDepositChecking 120,886,000us-gaap_InterestBearingDomesticDepositChecking  
Money Market/Savings 600,764,000us-gaap_DepositsMoneyMarketDeposits 503,989,000us-gaap_DepositsMoneyMarketDeposits  
Regular passbook 74,508,000us-gaap_DepositsSavingsDeposits 76,412,000us-gaap_DepositsSavingsDeposits  
Total transaction accounts 1,189,153,000ppbi_TransactionAccounts 991,630,000ppbi_TransactionAccounts  
Certificates of deposit accounts      
Up to $100,000 123,862,000ppbi_TimeDepositsLessThanDollars100000 125,313,000ppbi_TimeDepositsLessThanDollars100000  
Over $100,000 to $250,000 163,819,000ppbi_TimeDepositsOverDollars100000ToDollars250000 130,711,000ppbi_TimeDepositsOverDollars100000ToDollars250000  
Over $250,000 153,992,000ppbi_TimeDepositsOverDollars250000 58,632,000ppbi_TimeDepositsOverDollars250000  
Total certificates of deposit accounts 441,673,000us-gaap_TimeDeposits 314,656,000us-gaap_TimeDeposits  
Total deposits 1,630,826,000us-gaap_Deposits 1,306,286,000us-gaap_Deposits  
Transaction accounts, Weighted Average Interest Rate      
Noninterest-bearing checking (as a percent) 0.00%ppbi_NoninterestBearingDepositLiabilitiesWeightedAverageInterestRate 0.00%ppbi_NoninterestBearingDepositLiabilitiesWeightedAverageInterestRate  
Interest-bearing checking (as a percent) 0.11%ppbi_InterestBearingDepositLiabilitiesWeightedAverageInterestRate 0.11%ppbi_InterestBearingDepositLiabilitiesWeightedAverageInterestRate  
Money market (as a percent) 0.32%ppbi_DepositsMoneyMarketDepositsWeightedAverageInterestRate 0.29%ppbi_DepositsMoneyMarketDepositsWeightedAverageInterestRate  
Regular passbook (as a percent) 0.14%ppbi_DepositsSavingsDepositsWeightedAverageInterestRate 0.14%ppbi_DepositsSavingsDepositsWeightedAverageInterestRate  
Total transaction accounts (as a percent) 0.16%ppbi_TransactionAccountsWeightedAverageInterestRate 0.15%ppbi_TransactionAccountsWeightedAverageInterestRate  
Certificates of deposit accounts, Weighted Average Interest Rate      
Up to $100,000 (as a percent) 0.91%ppbi_TimeDepositsLessThanDollars100000WeightedAverageInterestRate 0.80%ppbi_TimeDepositsLessThanDollars100000WeightedAverageInterestRate  
Over $100,000 to $250,000 (as a percent) 1.00%ppbi_TimeDepositsOverDollars100000ToDollars250000WeightedAverageInterestRate 0.93%ppbi_TimeDepositsOverDollars100000ToDollars250000WeightedAverageInterestRate  
Over $250,000 (as a percent) 0.76%ppbi_TimeDepositsOverDollars250000WeightedAverageInterestRate 0.95%ppbi_TimeDepositsOverDollars250000WeightedAverageInterestRate  
Total certificates of deposit accounts (as a percent) 0.89%ppbi_TimeDepositsWeightedAverageInterestRate 0.88%ppbi_TimeDepositsWeightedAverageInterestRate  
Total deposits (as a percent) 0.36%ppbi_DepositsWeightedAverageInterestRate 0.33%ppbi_DepositsWeightedAverageInterestRate  
Certificates of deposit accounts, Balance      
Within 3 months 83,268,000ppbi_TimeDepositMaturitiesWithinThreeMonths    
4 to 6 months 66,023,000ppbi_TimeDepositMaturitiesFourToSixMonths    
7 to 12 months 136,616,000ppbi_TimeDepositMaturitiesSevenToTwelveMonths    
13 to 24 months 142,396,000us-gaap_TimeDepositMaturitiesYearTwo    
25 to 36 months 10,400,000us-gaap_TimeDepositMaturitiesYearThree    
37 to 60 months 2,405,000ppbi_TimeDepositMaturitiesYearsFourAndFive    
Over 60 months 565,000us-gaap_TimeDepositMaturitiesAfterYearFive    
Total certificates of deposit accounts 441,673,000us-gaap_TimeDeposits 314,656,000us-gaap_TimeDeposits  
Certificates of deposit accounts, Weighted average interest rate      
Within 3 months (as a percent) 0.95%ppbi_TimeDepositsWeightedAverageInterestRateMaturitiesWithinThreeMonths    
4 to 6 months (as a percent) 1.02%ppbi_TimeDepositsWeightedAverageInterestRateMaturitiesFourToSixMonths    
7 to 12 months (as a percent) 0.77%ppbi_TimeDepositsWeightedAverageInterestRateMaturitiesSevenToTwelveMonths    
13 to 24 months (as a percent) 0.89%us-gaap_TimeDepositsWeightedAverageInterestRateMaturitiesYearTwo    
25 to 36 months (as a percent) 1.06%us-gaap_TimeDepositsWeightedAverageInterestRateMaturitiesYearThree    
37 to 60 months (as a percent) 1.43%ppbi_TimeDepositsWeightedAverageInterestRateMaturitiesYearsFourAndFive    
Over 60 months (as a percent) 1.01%us-gaap_TimeDepositsWeightedAverageInterestRateMaturitiesGreaterThanFiveYears    
Total certificates of deposit accounts (as a percent) 0.89%ppbi_TimeDepositsWeightedAverageInterestRate 0.88%ppbi_TimeDepositsWeightedAverageInterestRate  
Average cost of deposits (as a percent) 0.34%ppbi_AverageCostsOfDeposits 0.34%ppbi_AverageCostsOfDeposits  
Interest expense on deposit accounts      
Checking accounts 161,000us-gaap_InterestExpenseDemandDepositAccounts 110,000us-gaap_InterestExpenseDemandDepositAccounts 82,000us-gaap_InterestExpenseDemandDepositAccounts
Passbook accounts 110,000us-gaap_InterestExpenseSavingsDeposits 103,000us-gaap_InterestExpenseSavingsDeposits 266,000us-gaap_InterestExpenseSavingsDeposits
Money market accounts 1,443,000us-gaap_InterestExpenseMoneyMarketDeposits 1,043,000us-gaap_InterestExpenseMoneyMarketDeposits 727,000us-gaap_InterestExpenseMoneyMarketDeposits
Certificates of deposit accounts 3,323,000us-gaap_InterestExpenseTimeDeposits 2,809,000us-gaap_InterestExpenseTimeDeposits 4,778,000us-gaap_InterestExpenseTimeDeposits
Interest Expense, Deposits, Total 5,037,000us-gaap_InterestExpenseDeposits 4,065,000us-gaap_InterestExpenseDeposits 5,853,000us-gaap_InterestExpenseDeposits
Accrued interest on deposits $ 136,000us-gaap_DepositLiabilitiesAccruedInterest $ 94,000us-gaap_DepositLiabilitiesAccruedInterest