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          <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityEmergingGrowthCompany" xlink:label="dei_EntityEmergingGrowthCompany"/>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_LoanModificationsMadeToBorrowersExperiencingFinancialDifficultyPercentage_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Percent of Total Class of Loans</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Financing Receivables, Equal to Greater than 90 Days Past Due [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Financial Asset, Equal to or Greater than 90 Days Past Due [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ConcentrationRiskByTypeAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Concentration Risk Type</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ConcentrationRiskByTypeAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Concentration Risk Type [Axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_GainLossOnSaleOfOtherRealEstateAndRepossessedAssets_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Net gain on sale of other real estate and repossessed assets</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_GainLossOnSaleOfOtherRealEstateAndRepossessedAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Gain Loss On Sale Of Other Real Estate And Repossessed Assets</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_GainLossOnSaleOfOtherRealEstateAndRepossessedAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Gain loss on sale of other real estate and repossessed assets.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinancingReceivableOriginatedTwoYearsBeforeLatestFiscalYear_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinancingReceivableOriginatedTwoYearsBeforeLatestFiscalYear_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">2024</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityIncorporationStateCountryCode_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Entity Incorporation, State or Country Code</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityIncorporationStateCountryCode_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Entity Incorporation, State or Country Code</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PreferredStockSharesIssued_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Preferred stock, shares issued (in shares)</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">NONCASH ACTIVITIES:</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Available for Sale, fair value, due in one year or less</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, Year One</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_FinancingReceivableAmortizedCostOfLoansExperiencingFinancialDifficultyAndModifiedTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Schedule of Amortized Cost of Loans Experiencing Financial Difficulty and Modified</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_FinancingReceivableAmortizedCostOfLoansExperiencingFinancialDifficultyAndModifiedTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Financing receivable amortized cost of loans experiencing financial difficulty and modified [Table Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_FinancingReceivableAmortizedCostOfLoansExperiencingFinancialDifficultyAndModifiedTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Financing receivable amortized cost of loans experiencing financial difficulty and modified.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinancingReceivablePortfolioSegmentAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Financing Receivable Portfolio Segment [Axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinancingReceivablePortfolioSegmentAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Financing Receivable Portfolio Segment</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PlanNameAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Plan Name</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PlanNameAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Plan Name [Axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Available for Sale, Estimated Fair Value, 12 Months or More</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EquityAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Notes to Financial Statements</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityCurrentReportingStatus_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Entity Current Reporting Status</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Class of Financing Receivable</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Class of Financing Receivable [Axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_CertainLoanAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Recorded investment</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_CertainLoanAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Certain Loan Acquired In Transfer Not Accounted for as Debt Securities Carrying Amount Net</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_CertainLoanAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Certain loan acquired in transfer not accounted for as debt securities carrying amount net.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueInputsLevel2Member_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Level 2 [Member]</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommitmentsAndContingenciesDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Contractual Obligations and Off-Balance Sheet Items</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommitmentsAndContingenciesDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Commitments and Contingencies Disclosure [Text Block]</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Finite-Lived Intangible Asset, Expected Amortization, Year Four</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">2030</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax_lbl" xlink:role="http://www.xbrl.org/2003/role/label">OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, Tax</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Change in unrealized gain during period, tax effect</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_ProvisionForLoansAndLeaseLosses_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Provision for Loans and Lease Losses</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_ProvisionForLoansAndLeaseLosses_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Provision for loans and lease losses.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_ProvisionForLoansAndLeaseLosses_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Provision for credit losses on loans</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_ScheduleOfOffBalanceSheetCreditLossLiabilityTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Rollforward of Allowance for Credit Losses on Off-Balance Sheet Credit Exposures</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_ScheduleOfOffBalanceSheetCreditLossLiabilityTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Schedule of Off-Balance-Sheet, Credit Loss, Liability [Table Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_ScheduleOfOffBalanceSheetCreditLossLiabilityTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Schedule of off-balance-sheet credit loss liability.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockSharesIssued_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Common stock, shares issued (in shares)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockSharesIssued_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Common Stock, Shares, Issued</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Asset Class</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Asset Class [Domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StatementTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Statement [Table]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StatementTable_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Statement [Table]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_FinancingReceivables30To89DaysPastDueMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Financing Receivables, 30 to 89 Days Past Due [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_FinancingReceivables30To89DaysPastDueMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Financing Receivables30 To89 Days Past Due [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_FinancingReceivables30To89DaysPastDueMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Financing receivables that are 30 to 89 days past due.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RealEstateAcquisitionsThroughForeclosures_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Acquisition of real estate through foreclosure of collateral</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RealEstateAcquisitionsThroughForeclosures_lbl" xlink:role="http://www.xbrl.org/2003/role/label">SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Acquisition Through Foreclosure</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Right-of-Use asset obtained in exchange for operating lease liability</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Right-of-Use Asset Obtained in Exchange for Operating Lease Liability</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_ImpairedLoansOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Impaired loans outstanding</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_ImpairedLoansOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Impaired Loans Outstanding</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_ImpairedLoansOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Impaired loans outstanding.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InterestReceivable_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Accrued interest receivable</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InterestReceivable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Interest Receivable</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NoninterestBearingDepositLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Noninterest-Bearing Deposit Liabilities, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NoninterestBearingDepositLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Noninterest-bearing</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NoninterestBearingDepositLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Noninterest-Bearing Deposit Liabilities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ExtendedMaturityAndPrincipalForgivenessMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Term Extension [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ExtendedMaturityAndPrincipalForgivenessMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Extended Maturity and Principal Forgiveness [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LoansAndLeasesReceivableRelatedPartiesAdditions_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">New loans</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LoansAndLeasesReceivableRelatedPartiesAdditions_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Loans and Leases Receivable, Related Parties, Additions</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LoansAndLeasesReceivableRelatedPartiesProceeds_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Repayments</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LoansAndLeasesReceivableRelatedPartiesProceeds_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Loans and Leases Receivable, Related Parties, Proceeds</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsNetCarryingAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Held to Maturity, amortized cost, due after one year through five years</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsNetCarryingAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, after Year One through Five</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StatementLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Statement [Line Items]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StatementLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Statement [Line Items]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessAcquisitionAcquireeDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Business Acquisition, Acquiree</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessAcquisitionAcquireeDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Business Combination [Domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_NoninterestIncomeCreditCardDebitCardAndATMCard_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Credit card, debit card and ATM card income</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_NoninterestIncomeCreditCardDebitCardAndATMCard_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Noninterest Income Credit Card Debit Card And A T M Card</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_NoninterestIncomeCreditCardDebitCardAndATMCard_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Noninterest income, credit card, debit card and ATM card.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityFilerCategory_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Entity Filer Category</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityFilerCategory_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Entity Filer Category</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_AllowanceForLoansAndLeaseLossesWriteoffsNet_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Net charge-offs</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_AllowanceForLoansAndLeaseLossesWriteoffsNet_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedTotalLabel">Net (charge-offs) recoveries</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_AllowanceForLoansAndLeaseLossesWriteoffsNet_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Allowance for Loans and Lease Losses Writeoffs Net</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_AllowanceForLoansAndLeaseLossesWriteoffsNet_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Allowance for loans and lease losses writeoffs net.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LiabilitiesAndStockholdersEquity_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">TOTAL LIABILITIES AND SHAREHOLDERS&#8217; EQUITY</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LiabilitiesAndStockholdersEquity_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Liabilities and Equity</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_HeldToMaturitySecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasis_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Held to Maturity, amortized cost, subtotal</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_HeldToMaturitySecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NoninterestIncome_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total noninterest income</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NoninterestIncome_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Noninterest Income</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EquitySecuritiesByIndustryAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Industry Sector</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EquitySecuritiesByIndustryAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Industry Sector [Axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DerivativeAssetFairValueNetAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Derivative financial instruments:</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DerivativeAssetFairValueNetAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Derivative Asset, Subject to Master Netting Arrangement, before Offset of Collateral [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_WestTexasMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">West Texas [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_WestTexasMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">West Texas [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_WestTexasMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">West Texas.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueByBalanceSheetGroupingTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Summary of Carrying and Fair Value Information of Financial Instruments</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueByBalanceSheetGroupingTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Fair Value, by Balance Sheet Grouping [Table Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_ScheduleOfIntangibleAssetsAndGoodwillLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Schedule Of Intangible Assets And Goodwill [Line Items]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_ScheduleOfIntangibleAssetsAndGoodwillLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Schedule Of Intangible Assets And Goodwill [Line Items]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_ScheduleOfIntangibleAssetsAndGoodwillLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Schedule of intangible assets and goodwill.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InterestRateBelowMarketReductionMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Interest Rate Reduction [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InterestRateBelowMarketReductionMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Interest Rate Below Market Reduction [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DerivativeLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Derivative [Line Items]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DerivativeLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Derivative [Line Items]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_Goodwill_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Goodwill resulting from acquisition</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_Goodwill_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Goodwill, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_Goodwill_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Goodwill</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_Goodwill_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel">Goodwill, Beginning balance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_Goodwill_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel">Goodwill, Ending balance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_Goodwill_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Goodwill</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeTaxesPaid_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Income taxes paid</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeTaxesPaid_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Income Taxes Paid</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_SegmentGeographicalDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Geographical</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_SegmentGeographicalDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Geographical [Domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_CentralTexasMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Central Texas.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_CentralTexasMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Central Texas [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_CentralTexasMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Central Texas [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Available for Sale, amortized cost, due after ten years</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 10</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_FinancingReceivablePayableOriginatedFourYearsBeforeLatestFiscalYear_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Financing Receivable Payable Originated Four Years Before Latest Fiscal Year</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_FinancingReceivablePayableOriginatedFourYearsBeforeLatestFiscalYear_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Financing receivable (payable) originated four years before latest fiscal year.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_FinancingReceivablePayableOriginatedFourYearsBeforeLatestFiscalYear_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">2022</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_UnderlyingAssetClassDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Underlying Asset Class</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_UnderlyingAssetClassDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Underlying Asset Class [Domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AdditionalPaidInCapitalCommonStock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Capital surplus</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AdditionalPaidInCapitalCommonStock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Additional Paid in Capital, Common Stock</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_FinancingReceivableRevolvingConvertedToTermLoans_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Revolving Loans Converted to Term Loans</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_FinancingReceivableRevolvingConvertedToTermLoans_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Financing Receivable Revolving Converted To Term Loans</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_FinancingReceivableRevolvingConvertedToTermLoans_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Financing receivable revolving converted to term loans.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_NumberOfSubleaseArrangement_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Number of sublease arrangement</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_NumberOfSubleaseArrangement_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Number Of Sublease Arrangement</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_NumberOfSubleaseArrangement_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Number of sublease arrangement.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ProceedsFromSaleAndMaturityOfHeldToMaturitySecurities_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Proceeds from Sale and Maturity of Held-to-Maturity Securities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ProceedsFromSaleAndMaturityOfHeldToMaturitySecurities_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Proceeds from Sale and Maturity of Held-to-Maturity Securities, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ProceedsFromSaleAndMaturityOfHeldToMaturitySecurities_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Proceeds from maturities and principal paydowns of held to maturity securities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinancingReceivablesImpairedTroubledDebtRestructuringWriteDown_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Restructured loans charge-off</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinancingReceivablesImpairedTroubledDebtRestructuringWriteDown_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsNetCarryingAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Held to Maturity, amortized cost, due after ten years</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsNetCarryingAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, after Year 10</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ConversionOfStockAmountConverted1_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Cost basis</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ConversionOfStockAmountConverted1_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Conversion of Stock, Amount Converted</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_VisaStockExchangeMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Visa Stock Exchange [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_VisaStockExchangeMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Visa stock exchange.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NonperformingFinancingReceivableMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Nonperforming Financial Loans [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NonperformingFinancingReceivableMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Nonperforming Financial Instruments [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_NoninterestIncomeTrust_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Trust income</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_NoninterestIncomeTrust_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Noninterest Income Trust</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_NoninterestIncomeTrust_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Noninterest income, trust.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FiniteLivedIntangibleAssetUsefulLife_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Finite-lived intangible assets, useful life</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FiniteLivedIntangibleAssetUsefulLife_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Finite-Lived Intangible Asset, Useful Life</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_LoansAndLeaseReceivableAllowance_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel">Allowance for credit losses on loans, ending balance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_LoansAndLeaseReceivableAllowance_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel">Allowance for credit losses on loans, beginning balance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_LoansAndLeaseReceivableAllowance_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Less: allowance for credit losses on loans</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_LoansAndLeaseReceivableAllowance_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Loans and Lease Receivable Allowance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_LoansAndLeaseReceivableAllowance_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Loans and lease receivable allowance.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Number of restricted shares granted</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_PercentageOfRealEstateLoansAggregatingToCompanyLoanPortfolioExcludingWarehousePurchaseProgramLoans_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Percentage of real estate loans aggregating to company loan portfolio, excluding Warehouse Purchase Program loans</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_PercentageOfRealEstateLoansAggregatingToCompanyLoanPortfolioExcludingWarehousePurchaseProgramLoans_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Percentage Of Real Estate Loans Aggregating To Company Loan Portfolio Excluding Warehouse Purchase Program Loans</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_PercentageOfRealEstateLoansAggregatingToCompanyLoanPortfolioExcludingWarehousePurchaseProgramLoans_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Percentage of multiple industry loans aggregating to company loan portfolio excluding Warehouse Purchase Program loans.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Schedule of Earnings Per Share, Basic and Diluted</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_AmericanBankHoldingCorporationMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">American Bank Holding Corporation [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_AmericanBankHoldingCorporationMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">American Bank Holding Corporation.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_AmericanBankHoldingCorporationMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">American Bank Holding Corporation [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SpecialMentionMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Grade 5 [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SpecialMentionMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Special Mention [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InvestmentsClassifiedByContractualMaturityDateTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Investment Securities by Contractual Maturity</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InvestmentsClassifiedByContractualMaturityDateTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Investments Classified by Contractual Maturity Date [Table Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EarningsPerShareBasic_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Earnings Per Share, Basic, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EarningsPerShareBasic_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Earnings Per Share, Basic</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EarningsPerShareBasic_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Per Share Amount, Basic</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionsTwelveMonthsOrLongerFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Held to Maturity, Estimated Fair Value, 12 Months or More</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionsTwelveMonthsOrLongerFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Held to Maturity Securities Continuous Unrealized Loss Positions Twelve Months or Longer Fair Value</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionsTwelveMonthsOrLongerFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Held to maturity securities continuous unrealized loss positions twelve months or longer fair value.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Held to Maturity, Gross Unrealized Gains</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Debt Securities, Held-to-Maturity, Accumulated Unrecognized Gain</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel">Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number, Ending Balance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel">Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number, Beginning Balance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Number of options outstanding</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Number of shares outstanding</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PaymentsForProceedsFromLoansAndLeases_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Payments for (Proceeds from) Loans and Leases, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PaymentsForProceedsFromLoansAndLeases_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Payments for (Proceeds from) Loans and Leases</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PaymentsForProceedsFromLoansAndLeases_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Net decrease in loans held for investment</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinitelivedIntangibleAssetsAcquired1_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Finite-Lived Intangible Assets Acquired</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinitelivedIntangibleAssetsAcquired1_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Core Deposit Intangibles, Merger</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Adjustments to reconcile net income to net cash provided by operating activities:</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Lessee, Operating Lease, Liability, to be Paid, Year Five</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">2031</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_SouthwestBancsharesIncMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Southwest Bancshares Inc [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_SouthwestBancsharesIncMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Southwest Bancshares Inc.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_SouthwestBancsharesIncMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Southwest Bancshares, Inc. [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeTaxPaidFederalAfterRefundReceived_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Income Tax Paid, Federal, after Refund Received</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeTaxPaidFederalAfterRefundReceived_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Income Tax Paid, Federal, after Refund Received, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeTaxPaidFederalAfterRefundReceived_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">U.S. federal income taxes, net of refunds received</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Financing Receivable Allowance For Credit Losses [Line Items]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Financing Receivable, Allowance for Credit Loss [Line Items]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_RegulatoryAssessmentsAndFdicInsurance_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Regulatory assessments and FDIC insurance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_RegulatoryAssessmentsAndFdicInsurance_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Regulatory Assessments And Fdic Insurance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_RegulatoryAssessmentsAndFdicInsurance_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Amount of expense for Federal Deposit Insurance Corporation (FDIC) insurance and regulatory assessments.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Proceeds from maturities, sales and principal paydowns of available for sale securities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Proceeds from Sale and Maturity of Debt Securities, Available-for-Sale</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Proceeds from Sale and Maturity of Debt Securities, Available-for-Sale, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Accounting Standards Update</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Accounting Standards Update [Axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockholdersEquityAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">SHAREHOLDERS&#8217; EQUITY:</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockholdersEquityAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Equity, Attributable to Parent [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_ChangesInAccretableYieldForPciAndNonPciLoansTable_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Changes In Accretable Yield For Pci And Non Pci Loans [Table]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_ChangesInAccretableYieldForPciAndNonPciLoansTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Changes In Accretable Yield For Pci And Non Pci Loans [Table]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_ChangesInAccretableYieldForPciAndNonPciLoansTable_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Changes in accretable yield for PCI and Non PCI loans table.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntitySmallBusiness_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Entity Small Business</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntitySmallBusiness_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Entity Small Business</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InterestAndDividendIncomeOperatingAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">INTEREST INCOME:</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InterestAndDividendIncomeOperatingAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Interest and Dividend Income, Operating [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_NumberOfBankingOffices_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Number of banking offices</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_NumberOfBankingOffices_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Number Of Banking Offices</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_NumberOfBankingOffices_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Number of banking offices.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_LoansAndLeasesReceivableNetOfDeferredIncomeAndLoanReceivableHeldForSaleAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_LoansAndLeasesReceivableNetOfDeferredIncomeAndLoanReceivableHeldForSaleAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total loans</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_LoansAndLeasesReceivableNetOfDeferredIncomeAndLoanReceivableHeldForSaleAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Total loans, including Warehouse Purchase Program</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_LoansAndLeasesReceivableNetOfDeferredIncomeAndLoanReceivableHeldForSaleAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Loans And Leases Receivable Net Of Deferred Income And Loan Receivable Held For Sale Amount</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PaymentDeferralMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Payment Delay [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PaymentDeferralMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Payment Deferral [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_CommitmentsExpectedToFund_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Commitments expected to fund</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_CommitmentsExpectedToFund_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Commitments Expected To Fund</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_CommitmentsExpectedToFund_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Commitments expected to fund.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RetainedEarningsAccumulatedDeficit_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Retained Earnings (Accumulated Deficit), Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RetainedEarningsAccumulatedDeficit_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Retained earnings</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RetainedEarningsAccumulatedDeficit_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Retained Earnings (Accumulated Deficit)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EquitySecuritiesIndustryMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Industry Sector</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EquitySecuritiesIndustryMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Industry Sector [Domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_LoanToBeConsideredAsPaymentDefaultInPeriod_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Loan to be Considered as Payment Default in Period</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_LoanToBeConsideredAsPaymentDefaultInPeriod_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Loan To Be Considered As Payment Default In Period</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_LoanToBeConsideredAsPaymentDefaultInPeriod_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Loan to be considered as payment default in period.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_ForwardMortgageBackedSecuritiesTradesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Forward Mortgage-Backed Securities Trades [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_ForwardMortgageBackedSecuritiesTradesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Forward Mortgage Backed Securities Trades [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_ForwardMortgageBackedSecuritiesTradesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Forward mortgage backed securities trades.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Stock-Based Compensation</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Payment Arrangement [Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Organization, Consolidation and Presentation of Financial Statements [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PaymentsOfDividends_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Payments of Dividends, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PaymentsOfDividends_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Payments of cash dividends</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PaymentsOfDividends_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Payments of Dividends</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LeasesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Leases [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionsFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Held to Maturity, Estimated Fair Value, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionsFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Held to Maturity Securities Continuous Unrealized Loss Positions Fair Value</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionsFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Held to maturity securities continuous unrealized loss positions fair value.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_UnusualRiskOrUncertaintyNatureDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Unusual Risk or Uncertainty, Nature</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_UnusualRiskOrUncertaintyNatureDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Unusual Risk or Uncertainty, Nature [Domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_AmendmentFlag_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Amendment Flag</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_AmendmentFlag_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Amendment Flag</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax_lbl" xlink:role="http://www.xbrl.org/2003/role/label">OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment and Tax</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Change in unrealized gain during the period</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Change in unrealized gain during period, before tax amount</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfHeldToMaturitySecuritiesLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Schedule Of Held To Maturity Securities [Line Items]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfHeldToMaturitySecuritiesLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Schedule of Held-to-Maturity Securities [Line Items]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_LoansAndAllowanceForCreditLossesTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Loans and Allowance for Credit Losses</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_LoansAndAllowanceForCreditLossesTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Loans And Allowance For Credit Losses [Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_LoansAndAllowanceForCreditLossesTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Loans and allowance for credit losses</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLossesLoanModificationsAmortizedCost_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Amortized Cost</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLossesLoanModificationsAmortizedCost_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Financing Receivable, Excluding Accrued Interest, Before Allowance For Credit Losses, Loan Modifications, Amortized Cost</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLossesLoanModificationsAmortizedCost_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Financing receivable, excluding accrued interest, before allowance for credit losses, loan modifications, amortized cost.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LiabilitiesAndStockholdersEquityAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">LIABILITIES AND SHAREHOLDERS&#8217; EQUITY</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LiabilitiesAndStockholdersEquityAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Liabilities and Equity [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityAddressPostalZipCode_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Entity Address, Postal Zip Code</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityAddressPostalZipCode_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Entity Address, Postal Zip Code</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetCashProvidedByUsedInOperatingActivities_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Net cash provided by operating activities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetCashProvidedByUsedInOperatingActivities_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cash Provided by (Used in) Operating Activity, Including Discontinued Operation</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_NonperformingAssetsToLoansExcludingWarehousePurchaseProgramLoansAndOtherRealEstate_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Nonperforming assets to total loans, excluding Warehouse Purchase Program loans, and other real estate</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_NonperformingAssetsToLoansExcludingWarehousePurchaseProgramLoansAndOtherRealEstate_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Nonperforming Assets To Loans Excluding Warehouse Purchase Program Loans And Other Real Estate</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_NonperformingAssetsToLoansExcludingWarehousePurchaseProgramLoansAndOtherRealEstate_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Nonperforming assets to loans excluding warehouse purchase program loans and other real estate.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_WestNorthAndCentralTexasMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">West, North and Central Texas [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_WestNorthAndCentralTexasMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">West North And Central Texas [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_WestNorthAndCentralTexasMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">West North and Central Texas.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Common Stock [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Common Stock [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_AllowanceForLoansAndLeaseLossesWriteOffsNetIncreaseDecrease_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Increase in net charge-off</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_AllowanceForLoansAndLeaseLossesWriteOffsNetIncreaseDecrease_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Allowance For Loans And Lease Losses Write offs Net Increase (Decrease)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_AllowanceForLoansAndLeaseLossesWriteOffsNetIncreaseDecrease_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Allowance for loans and lease losses write offs net increase (decrease).</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CreditDerivativeMaximumExposureUndiscounted_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Credit exposure</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CreditDerivativeMaximumExposureUndiscounted_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Credit Derivative, Maximum Exposure, Undiscounted</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Lessee, Operating Lease, Liability, to be Paid, Year Three</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">2029</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_UnvestedRestrictedStockMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Unvested Restricted Stock [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_UnvestedRestrictedStockMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Unvested Restricted Stock [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_UnvestedRestrictedStockMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Unvested restricted stock.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfDerivativeInstrumentsInStatementOfFinancialPositionFairValueTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Schedule of Notional Balances and Fair Value of Derivative Positions</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfDerivativeInstrumentsInStatementOfFinancialPositionFairValueTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Schedule Of Available For Sale Securities [Line Items]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Debt Securities, Available-for-Sale [Line Items]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_NoninterestIncomeMortgage_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Mortgage income</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_NoninterestIncomeMortgage_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Noninterest Income Mortgage</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_NoninterestIncomeMortgage_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Noninterest income, mortgage.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PortionAtFairValueFairValueDisclosureMember_lbl" xlink:role="http://fasb.org/us-gaap/role/label/axisDefault">Portion at Fair Value Measurement [Member] [Default]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PortionAtFairValueFairValueDisclosureMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Fair Value Disclosure Item Amounts [Default]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PortionAtFairValueFairValueDisclosureMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Portion at Fair Value Measurement [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityAddressAddressLine1_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Entity Address, Address Line One</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityAddressAddressLine1_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Entity Address, Address Line One</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_MarketableSecuritiesTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Marketable Securities [Table]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_LoneStarMergerMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Lone Star merger.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_LoneStarMergerMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Lone Star Merger [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_LoneStarMergerMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Lone Star merger [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueByFairValueHierarchyLevelAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Level 2 [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueByFairValueHierarchyLevelAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Fair Value Hierarchy and NAV [Axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EarningsPerShareAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">EARNINGS PER SHARE:</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EarningsPerShareAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Earnings Per Share [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasis_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Available for Sale, amortized cost, subtotal</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Amortized Cost</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SupplementalCashFlowInformationAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">SUPPLEMENTAL INFORMATION:</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SupplementalCashFlowInformationAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Supplemental Cash Flow Information [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_CertainLoanAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel">Balance at beginning of period</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_CertainLoanAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Certain Loan Acquired in Transfer Not Accounted for as Debt Securities Accretable Yield</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_CertainLoanAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Certain loan acquired in transfer not accounted for as debt securities accretable yield.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_CertainLoanAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel">Balance at March 31,</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionsLessThanTwelveMonthsFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Held to Maturity, Estimated Fair Value, Less than 12 Months</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionsLessThanTwelveMonthsFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Held to Maturity Securities Continuous Unrealized Loss Positions Less Than Twelve Months Fair Value</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionsLessThanTwelveMonthsFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Held to maturity securities continuous unrealized loss positions less than twelve months fair value.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_GoodwillAndIntangibleAssetsDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Goodwill and Core Deposit Intangibles</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_GoodwillAndIntangibleAssetsDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Goodwill and Intangible Assets Disclosure [Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_HeldToMaturitySecuritiesDebtMaturitiesSingleMaturityDateFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Held to Maturity, fair value, subtotal</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_HeldToMaturitySecuritiesDebtMaturitiesSingleMaturityDateFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Debt Securities, Held-to-Maturity, Maturity, Allocated and Single Maturity Date, Fair Value</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPosition_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Available for Sale, Estimated Fair Value, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPosition_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Debt Securities, Available-for-Sale, Unrealized Loss Position</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_FinancialAssetAcquiredWithSeasonedLoansMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">PSLs Loans [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_FinancialAssetAcquiredWithSeasonedLoansMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Financial Asset Acquired with Seasoned Loans [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_FinancialAssetAcquiredWithSeasonedLoansMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Financial Asset Acquired with Seasoned Loans.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PaymentsToAcquireAvailableForSaleSecuritiesDebt_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Purchase of available for sale securities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PaymentsToAcquireAvailableForSaleSecuritiesDebt_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Payments to Acquire Debt Securities, Available-for-Sale</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total securities available for sale, net of tax amount</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax_lbl" xlink:role="http://www.xbrl.org/2003/role/label">OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment and Tax</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_NonaccrualLoansToTotalLoansExcludingWarehousePurchaseProgramLoans_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Nonaccrual loans to total loans, excluding Warehouse Purchase Program loans</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_NonaccrualLoansToTotalLoansExcludingWarehousePurchaseProgramLoans_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Nonaccrual Loans To Total Loans Excluding Warehouse Purchase Program Loans</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_NonaccrualLoansToTotalLoansExcludingWarehousePurchaseProgramLoans_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Nonaccrual loans to total loans, excluding warehouse purchase program loans.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_DocumentType_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Document Type</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_DocumentType_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Document Type</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_OtherThanUSGovernmentAndAgenciesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Other than U.S. government and agencies.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_OtherThanUSGovernmentAndAgenciesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Other Than U S Government And Agencies [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_OtherThanUSGovernmentAndAgenciesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Other Than U.S. Government and Agencies [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_LoanCustomerCounterpartyMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Loan Customer Counterparty [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_LoanCustomerCounterpartyMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Loan Customer Counterparty [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_LoanCustomerCounterpartyMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Loan customer counterparty</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommitmentsToExtendCreditMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Commitments to Extend Credit [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommitmentsToExtendCreditMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Commitments to Extend Credit [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_LoansAndLeaseReceivableImpairedNonperformingNonaccrualOfInterest_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Loans and leases receivable, nonaccrual loans</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_LoansAndLeaseReceivableImpairedNonperformingNonaccrualOfInterest_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Loans and Lease Receivable Impaired Nonperforming Nonaccrual of Interest</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_LoansAndLeaseReceivableImpairedNonperformingNonaccrualOfInterest_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Loans and lease receivable impaired nonperforming nonaccrual of interest.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RepaymentsOfSubordinatedDebt_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Repayments of Subordinated Debt, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RepaymentsOfSubordinatedDebt_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Repayments of Subordinated Debt</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RepaymentsOfSubordinatedDebt_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Redemption of junior subordinated debentures</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityCentralIndexKey_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Entity Central Index Key</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityCentralIndexKey_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Entity Central Index Key</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InvestmentsDebtAndEquitySecuritiesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Notes to Financial Statements</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InvestmentsDebtAndEquitySecuritiesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Investments, Debt and Equity Securities [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DerivativeLiabilityFairValueNetAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Derivative financial instruments:</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DerivativeLiabilityFairValueNetAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InterestBearingDepositsInBanks_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Interest-bearing deposits from banks</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InterestBearingDepositsInBanks_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Interest-Bearing Deposits in Banks and Other Financial Institutions</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_SecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositionsGreaterThanOrEqualToOneYear_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Securities in Unrealized Loss Positions Qualitative Disclosure Number of Positions Greater Than or Equal to One Year</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_SecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositionsGreaterThanOrEqualToOneYear_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions Greater Than Or Equal To One Year</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_SecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositionsGreaterThanOrEqualToOneYear_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Number of investment positions in investments that have been in a continuous unrealized loss position for greater than or equal to a year for which an other-than-temporary impairment (OTTI) has not been recognized in the income statement.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LoansAndLeasesReceivableRelatedParties_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Loans and Leases Receivable, Related Parties</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LoansAndLeasesReceivableRelatedParties_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel">Beginning balance on January 1</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LoansAndLeasesReceivableRelatedParties_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel">Ending balance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LoansAndLeasesReceivableRelatedParties_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Loans and Leases Receivable, Related Parties</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">NET DECREASE IN CASH AND CASH EQUIVALENTS</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Antidilutive Securities excluded from computation of earnings per share, amount</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_LoansAndLeasesReceivableNetOfDeferredIncomeAndLoanReceivableCurrentPeriodGrossWriteoffsCurrentFiscalYear_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Loans and Leases Receivable Net of Deferred Income and Loan Receivable Current Period Gross Writeoffs Current Fiscal Year</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_LoansAndLeasesReceivableNetOfDeferredIncomeAndLoanReceivableCurrentPeriodGrossWriteoffsCurrentFiscalYear_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Loans and leases receivable net of deferred income and loan receivable current period gross writeoffs current fiscal year</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_LoansAndLeasesReceivableNetOfDeferredIncomeAndLoanReceivableCurrentPeriodGrossWriteoffsCurrentFiscalYear_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Current-period gross write-offs, 2026</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockRepurchasedAndRetiredDuringPeriodShares_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Common stock repurchase (in shares)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockRepurchasedAndRetiredDuringPeriodShares_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Common stock repurchase (in shares)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockRepurchasedAndRetiredDuringPeriodShares_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Stock Repurchased and Retired During Period, Shares</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsNetCarryingAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Held to Maturity, amortized cost, due after five years through ten years</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsNetCarryingAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, after Year 5 through 10</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockParOrStatedValuePerShare_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Common stock, par value (in dollars per share)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockParOrStatedValuePerShare_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Common Stock, Par or Stated Value Per Share</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfCapitalizationEquityLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Schedule of Capitalization, Equity [Line Items]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_TypeOfAdoptionMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Accounting Standards Update</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_TypeOfAdoptionMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Accounting Standards Update [Domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Other comprehensive income, net of tax</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Other comprehensive income</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Other comprehensive income</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LiabilitiesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">LIABILITIES:</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LiabilitiesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Liabilities [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_LoneStarStateBancsharesIncMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Lone Star State Bancshares Merger [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_LoneStarStateBancsharesIncMember_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Lone Star State Bancshares Inc [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_LoneStarStateBancsharesIncMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Lone Star State Bancshares, Inc. [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_LoneStarStateBancsharesIncMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Lone Star State Bancshares Inc.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Available for Sale, Amortized Cost</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Available for Sale Securities, Amortized Cost Basis</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Debt Securities, Available-for-Sale, Amortized Cost</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AvailableForSaleSecuritiesDebtSecurities_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Available for Sale</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AvailableForSaleSecuritiesDebtSecurities_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Available for Sale securities, at fair value</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AvailableForSaleSecuritiesDebtSecurities_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Available for sale securities, at fair value</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AvailableForSaleSecuritiesDebtSecurities_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Debt Securities, Available-for-Sale</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NoninterestIncomeAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">NONINTEREST INCOME:</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NoninterestIncomeAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Noninterest Income [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DoubtfulMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Grade 8 [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DoubtfulMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Doubtful [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DerivativeTable_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Derivative [Table]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DerivativeTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Derivative [Table]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ProceedsFromSaleOfLoansHeldForSale_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Proceeds from Sale of Loans Held-for-sale, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ProceedsFromSaleOfLoansHeldForSale_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Proceeds from sale of loans held for sale</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ProceedsFromSaleOfLoansHeldForSale_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Proceeds from Sale, Loan, Held-for-Sale</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfDerivativeInstrumentsTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Schedule of Weighted Average Received and Paid Interest Rates for Interest Rate Swaps Outstanding</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfDerivativeInstrumentsTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Schedule of Derivative Instruments [Table Text Block]</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EstimateOfFairValueFairValueDisclosureMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Estimate of Fair Value Measurement [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_MarketableSecurities_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total securities</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Deferred tax expense related to other comprehensive income</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel">Total other comprehensive income, tax effect</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DerivativeNotionalAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Outstanding Notional Balance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DerivativeNotionalAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Derivative, Notional Amount</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinancialInstrumentPerformanceStatusDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Financial Instrument Performance Status</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinancialInstrumentPerformanceStatusDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Financial Instrument Performance Status [Domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_CurrentFiscalYearEndDate_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Current Fiscal Year End Date</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_CurrentFiscalYearEndDate_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Current Fiscal Year End Date</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_CertainLoanAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldAdditions_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Additions</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_CertainLoanAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldAdditions_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Certain Loan Acquired in Transfer Not Accounted for as Debt Securities Accretable Yield Additions</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_CertainLoanAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldAdditions_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Certain loan acquired in transfer not accounted for as debt securities accretable yield additions.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_CommercialRealEstateIncludesMultifamilyResidentialMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Commercial Real Estate (Includes Multi-Family Residential) [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_CommercialRealEstateIncludesMultifamilyResidentialMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Commercial Real Estate Includes Multifamily Residential [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_CommercialRealEstateIncludesMultifamilyResidentialMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Related to the commercial real estate portfolio segment that includes multi-family residential.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_DocumentQuarterlyReport_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Document Quarterly Report</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_DocumentQuarterlyReport_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Document Quarterly Report</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ReceivablesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Notes to Financial Statements</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ReceivablesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Receivables [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueByBalanceSheetGroupingTable_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Fair Value By Balance Sheet Grouping [Table]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueByBalanceSheetGroupingTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Fair Value, by Balance Sheet Grouping [Table]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityAddressStateOrProvince_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Entity Address, State or Province</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityAddressStateOrProvince_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Entity Address, State or Province</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinancialInstrumentPerformanceStatusAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Financial Instrument Performance Status</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinancialInstrumentPerformanceStatusAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Financial Instrument Performance Status [Axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PreferredStockSharesOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel">Preferred Stock, Shares Outstanding, Ending Balance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PreferredStockSharesOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel">Preferred Stock, Shares Outstanding, Beginning Balance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PreferredStockSharesOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Preferred stock, shares outstanding (in shares)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PreferredStockSharesOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Preferred Stock, Shares Outstanding</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ComprehensiveIncomeNetOfTax_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Comprehensive income</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ComprehensiveIncomeNetOfTax_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Comprehensive Income (Loss), Net of Tax, Attributable to Parent</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Available for Sale, Gross Unrealized Gains</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ProceedsFromCollectionOfLoansReceivable_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Proceeds from pay-offs of Warehouse Purchase Program loans</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ProceedsFromCollectionOfLoansReceivable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Proceeds from Collection of Loans Receivable</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_StatementGeographicalAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Geographical</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_StatementGeographicalAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Geographical [Axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ConversionOfStockSharesConverted1_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Conversion of stock, shares converted</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ConversionOfStockSharesConverted1_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Conversion of Stock, Shares Converted</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_WarehousePurchaseProgramLoansMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Warehouse Purchase Program [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_WarehousePurchaseProgramLoansMember_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Warehouse Purchase Program Loans [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_WarehousePurchaseProgramLoansMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Warehouse Purchase Program Loans [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_WarehousePurchaseProgramLoansMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Warehouse Purchase Program Loans.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_IncreaseDecreaseInAllowanceForCreditLossesPercent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Increase in allowance for credit losses for loans, percentage</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_IncreaseDecreaseInAllowanceForCreditLossesPercent_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Increase Decrease In Allowance For Credit Losses Percent</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_IncreaseDecreaseInAllowanceForCreditLossesPercent_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Increase decrease in allowance for credit losses percent.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InternalCreditAssessmentAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Internal Credit Assessment</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InternalCreditAssessmentAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Internal Credit Assessment [Axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_AllowanceForLoansAndLeaseLossesWriteoffs_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Charge-offs</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_AllowanceForLoansAndLeaseLossesWriteoffs_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Allowance for Loans and Lease Losses WriteOffs</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_AllowanceForLoansAndLeaseLossesWriteoffs_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Allowance for loans and lease losses writeoffs.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_InterestIncomeFederalFundsSoldAndOtherEarningAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Federal funds sold and other earning assets</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_InterestIncomeFederalFundsSoldAndOtherEarningAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Interest Income Federal Funds Sold And Other Earning Assets</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_InterestIncomeFederalFundsSoldAndOtherEarningAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Interest income federal funds sold and other earning assets.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_NonPerformingAssetsToLoansAndOtherRealEstate_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Nonperforming assets to total loans and other real estate</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_NonPerformingAssetsToLoansAndOtherRealEstate_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Non Performing Assets To Loans And Other Real Estate</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_NonPerformingAssetsToLoansAndOtherRealEstate_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Non performing assets to loans and other real estate.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_MergerMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Merger [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_MergerMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Merger [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_MergerMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Merger [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Financing receivable, number of loans with default</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_SouthAndCentralTexasMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">South And Central Texas [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_SouthAndCentralTexasMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">South and Central Texas.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InterestExpenseOperating_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Interest Expense, Operating</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InterestExpenseOperating_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total interest expense</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">NET INTEREST INCOME AFTER PROVISION FOR CREDIT LOSSES</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Interest Income (Expense), after Provision for Loan Loss</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_AllowanceForLoansAndLeaseLossesPeriodIncreaseDecrease_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Increase in allowance for credit losses for loans</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_AllowanceForLoansAndLeaseLossesPeriodIncreaseDecrease_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Allowance for Loans and Lease Losses Period Increase Decrease</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_AllowanceForLoansAndLeaseLossesPeriodIncreaseDecrease_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Allowance for loans and lease losses period increase decrease.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_AllowanceForLoansAndLeaseLossesPeriodIncreaseDecrease_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Decrease in allowance for credit losses for loans</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ContractualObligationDueAfterFifthYear_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">5 years or more</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ContractualObligationDueAfterFifthYear_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Contractual Obligation, to be Paid, after Year Five</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_LoansAndLeasesReceivableNetOfDeferredIncomeAndLoanReceivableCurrentPeriodGrossWriteoffsTwoYearsBeforeLatestFiscalYear_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Loans And Leases Receivable Net Of Deferred Income And Loan Receivable Current Period Gross Writeoffs Two Years Before Latest Fiscal Year</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_LoansAndLeasesReceivableNetOfDeferredIncomeAndLoanReceivableCurrentPeriodGrossWriteoffsTwoYearsBeforeLatestFiscalYear_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Loans and leases receivable net of deferred income and loan receivable current period gross writeoffs two years before latest fiscal year.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_LoansAndLeasesReceivableNetOfDeferredIncomeAndLoanReceivableCurrentPeriodGrossWriteoffsTwoYearsBeforeLatestFiscalYear_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Current-period gross write-offs, 2024</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccumulatedOtherComprehensiveIncomeMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Accumulated Other Comprehensive Income (Loss) [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccumulatedOtherComprehensiveIncomeMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">AOCI Attributable to Parent [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_NameOfMajorCustomerDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Customer [Domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfHeldToMaturitySecuritiesTable_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Schedule Of Held To Maturity Securities [Table]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfHeldToMaturitySecuritiesTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Debt Securities, Held-to-Maturity [Table]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessCombinationConsiderationTransferred1_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Total consideration paid</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessCombinationConsiderationTransferred1_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Business Combination, Consideration Transferred, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessCombinationConsiderationTransferred1_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Total consideration</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessCombinationConsiderationTransferred1_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Business Combination, Consideration Transferred</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PreferredStockValue_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Preferred stock, $1 par value; 20,000,000 shares authorized; none issued or outstanding</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PreferredStockValue_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Preferred Stock, Value, Issued</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Available for Sale, amortized cost, mortgage-backed securities and collateralized mortgage obligations</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Debt Securities, Available-for-Sale, Maturity, without Single Maturity Date, Amortized Cost</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_MinimumMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Minimum [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_MinimumMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Minimum [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinancialInstrumentAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Financial Instrument</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinancialInstrumentAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Financial Instrument [Axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DerivativeFairValueOfDerivativeAsset_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Derivative financial instruments, assets at fair value</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DerivativeFairValueOfDerivativeAsset_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Derivative Asset, Subject to Master Netting Arrangement, before Offset</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinancingReceivableOriginatedInFiscalYearBeforeLatestFiscalYear_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinancingReceivableOriginatedInFiscalYearBeforeLatestFiscalYear_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">2025</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InterestExpenseOther_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Other borrowings</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InterestExpenseOther_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Interest Expense, Other</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_AllowanceOnPCDLoansAtAcquisition_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Allowance on PCD loans at acquisition</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_AllowanceOnPCDLoansAtAcquisition_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Allowance on PCD loans at acquisition.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_AllowanceOnPCDLoansAtAcquisition_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Allowance on PCD loans at acquisition</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_SummaryOfChangesInAccretableYieldsOfAcquiredLoansTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Summary Of Changes In Accretable Yields Of Acquired Loans Table [Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_SummaryOfChangesInAccretableYieldsOfAcquiredLoansTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Summary of Changes in Accretable Yields of Acquired Loans</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_SummaryOfChangesInAccretableYieldsOfAcquiredLoansTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Tabular disclosure for changes in the accretable yield for acquired purchased credit impaired loans and non purchased credit impaired loans.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AmortizationOfIntangibleAssets_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Core Deposit Intangibles, Amortization</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AmortizationOfIntangibleAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Amortization expense related to intangible assets</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AmortizationOfIntangibleAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Core deposit intangibles amortization</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AmortizationOfIntangibleAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Amortization of Intangible Assets</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueInputsLevel3Member_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Level 3 [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueInputsLevel3Member_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Fair Value, Inputs, Level 3 [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LiabilitiesFairValueDisclosureAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Liabilities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LiabilitiesFairValueDisclosureAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Liabilities, Fair Value Disclosure [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Fair Value Assets and Liabilities Measured on Recurring Basis</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_NedHolmesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Ned Holmes [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_NedHolmesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Ned Holmes.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_NedHolmesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Ned Holmes</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockRepurchasedAndRetiredDuringPeriodValue_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Common stock repurchase</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockRepurchasedAndRetiredDuringPeriodValue_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Stock Repurchased and Retired During Period, Value</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockRepurchasedAndRetiredDuringPeriodValue_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Common stock repurchase</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_NumberOfStockBasedEmployeeCompensationPlans_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Number of stock-based employee compensation plans</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_NumberOfStockBasedEmployeeCompensationPlans_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Number Of Stock Based Employee Compensation Plans</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_NumberOfStockBasedEmployeeCompensationPlans_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">The number of share-based payment award plans adopted by an entity.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SubleaseIncome_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Sublease income</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SubleaseIncome_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Sublease Income</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InternalInvestmentGradeMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Grade 1 [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InternalInvestmentGradeMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Internal Investment Grade [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Types of Loans in Loan Portfolio</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InterestExpenseAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">INTEREST EXPENSE:</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InterestExpenseAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Interest Expense, Operating and Nonoperating [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment, Tax, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Total securities available for sale, tax effect</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax_lbl" xlink:role="http://www.xbrl.org/2003/role/label">OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment, Tax</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinancialAssetAcquiredAndNoCreditDeteriorationMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Non-PCD Loans [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinancialAssetAcquiredAndNoCreditDeteriorationMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Financial Asset Acquired and No Credit Deterioration [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommitmentsAndContingencies_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">COMMITMENTS AND CONTINGENCIES</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommitmentsAndContingencies_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Commitments and Contingencies</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_FinancialEffectOnModificationsMaidOnLoanDueToTermExtension_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Financial effect on modifications maid on loan due to term extension.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_FinancialEffectOnModificationsMaidOnLoanDueToTermExtension_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Financial Effect On Modifications Maid On Loan Due to Term Extension</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_FinancialEffectOnModificationsMaidOnLoanDueToTermExtension_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Financial Effect on Term Extension</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_LSSBMergerMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">LSSB Merger [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_LSSBMergerMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">L S S B Merger [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_LSSBMergerMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">LSSB merger.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_GoodwillPurchaseAccountingAdjustments_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Goodwill, Measurement Period Adjustment</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_GoodwillPurchaseAccountingAdjustments_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Goodwill, Measurement period adjustment</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DepreciationAmortizationAndAccretionNet_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Depreciation, Amortization and Accretion, Net, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DepreciationAmortizationAndAccretionNet_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Depreciation and core deposit intangibles amortization</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DepreciationAmortizationAndAccretionNet_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Depreciation, Amortization and Accretion, Net</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CreditLossStatusAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Credit Loss Status</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CreditLossStatusAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Credit Loss Status [Axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ConcentrationRiskByBenchmarkAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Concentration Risk Benchmark</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ConcentrationRiskByBenchmarkAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Concentration Risk Benchmark [Axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PrimeMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Grade 2 [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PrimeMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Prime [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinancingReceivableImpairedLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Financing Receivable Impaired [Line Items]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinancingReceivableImpairedLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Financing Receivable, Impaired [Line Items]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_CommercialLoanInterestRateSwapAndCapMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Commercial Loan Interest Rate Swaps and Caps [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_CommercialLoanInterestRateSwapAndCapMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Commercial Loan Interest Rate Swap And Cap [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_CommercialLoanInterestRateSwapAndCapMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Commercial loan interest rate swap and cap.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InterestAndDividendIncomeOperating_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total interest income</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InterestAndDividendIncomeOperating_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Interest and Dividend Income, Operating</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinancingReceivableOriginatedFiveOrMoreYearsBeforeLatestFiscalYear_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Prior</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinancingReceivableOriginatedFiveOrMoreYearsBeforeLatestFiscalYear_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Financing Receivable, Originated, More than Five Years before Current Fiscal Year</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InterestIncomeExpenseNet_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">NET INTEREST INCOME</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InterestIncomeExpenseNet_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Interest Income (Expense), Operating</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ProfitLoss_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Net Income (Loss), Including Portion Attributable to Noncontrolling Interest, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ProfitLoss_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Net income</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ProfitLoss_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Net Income (Loss), Including Portion Attributable to Noncontrolling Interest</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NotesReceivableGross_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Financing Receivable, before Allowance for Credit Loss, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NotesReceivableGross_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Loans past due and still accruing</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NotesReceivableGross_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Financing Receivable, before Allowance for Credit Loss</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_ForeclosedRealEstateExpenseAndRevenue_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Foreclosed Real Estate Expense And Revenue</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_ForeclosedRealEstateExpenseAndRevenue_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Amount of revenue or expense recognized during the period for the foreclosure on real estate assets</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_ForeclosedRealEstateExpenseAndRevenue_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Net other real estate income</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionsLessThan12MonthsAccumulatedLoss_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Held to Maturity, Unrealized Losses, Less than 12 Months</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionsLessThan12MonthsAccumulatedLoss_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Held to Maturity Securities Continuous Unrealized Loss Positions Less Than 12 Months Accumulated Loss</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionsLessThan12MonthsAccumulatedLoss_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Held to maturity securities continuous unrealized loss positions less than 12 months accumulated loss.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_HeldToMaturitySecurities_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Held to Maturity, Amortized Cost</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_HeldToMaturitySecurities_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_HeldToMaturitySecurities_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Held to maturity securities, at cost (fair value of $10,687,015 and $9,433,365, respectively)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LongtermDebtTypeDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Long-Term Debt, Type [Domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Weighted Average Number of Shares Outstanding, Basic, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Weighted Average Number of Shares Outstanding, Basic</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Weighted average shares outstanding, Basic (in shares)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_GoodwillAcquiredDuringPeriod_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Goodwill, Acquired During Period</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_GoodwillAcquiredDuringPeriod_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Goodwill, Merger</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Schedule Of Share Based Compensation Arrangements By Share Based Payment Award [Table]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Available for Sale, Unrealized Losses, 12 Months or More</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InterestPayableCurrentAndNoncurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Accrued interest payable</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InterestPayableCurrentAndNoncurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Interest Payable</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_LoansAndLeasesReceivableNetOfDeferredIncomeAndLoanReceivableCurrentPeriodGrossWriteoffs_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Current-period gross write-offs, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_LoansAndLeasesReceivableNetOfDeferredIncomeAndLoanReceivableCurrentPeriodGrossWriteoffs_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Loans and Leases Receivable Net of Deferred Income and Loan Receivable Current Period Gross Writeoffs</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_LoansAndLeasesReceivableNetOfDeferredIncomeAndLoanReceivableCurrentPeriodGrossWriteoffs_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Loans and leases receivable net of deferred income and loan receivable current period gross writeoffs.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_PurchaseConsiderationCashPayablePerShare_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Purchase Consideration Cash Payable per Share</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_PurchaseConsiderationCashPayablePerShare_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Purchase consideration cash payable per share.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_PurchaseConsiderationCashPayablePerShare_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Purchase consideration cash payable per share</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">APIC, Share-Based Payment Arrangement, Increase for Cost Recognition, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Stock based compensation expense</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_lbl" xlink:role="http://www.xbrl.org/2003/role/label">APIC, Share-Based Payment Arrangement, Increase for Cost Recognition</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SecuritiesSoldUnderAgreementsToRepurchase_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Securities Sold under Agreements to Repurchase, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SecuritiesSoldUnderAgreementsToRepurchase_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Securities sold under repurchase agreements</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SecuritiesSoldUnderAgreementsToRepurchase_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Securities Sold under Agreements to Repurchase</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_SubordinatedNotesAndJuniorSubordinatedDebentures_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Subordinated notes and junior subordinated debentures</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_SubordinatedNotesAndJuniorSubordinatedDebentures_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Subordinated notes and junior subordinated debentures</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_SubordinatedNotesAndJuniorSubordinatedDebentures_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Subordinated notes and junior subordinated debentures.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockholdersEquity_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total shareholders&#8217; equity</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockholdersEquity_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel">BALANCE</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockholdersEquity_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel">BALANCE</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockholdersEquity_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Equity, Attributable to Parent</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PreferredStockParOrStatedValuePerShare_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Preferred stock, par value (in dollars per share)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PreferredStockParOrStatedValuePerShare_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Preferred Stock, Par or Stated Value Per Share</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ProceedsFromIncomeTaxRefundStateAndLocal_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Proceeds from Income Tax Refund, State and Local</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ProceedsFromIncomeTaxRefundStateAndLocal_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">State income taxes, net of refunds received</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LoansReceivableHeldForSaleAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Loans held for sale</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LoansReceivableHeldForSaleAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Loans held for sale</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LoansReceivableHeldForSaleAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Financing Receivable, Held-for-Sale</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StatementOfStockholdersEquityAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Statement of Stockholders' Equity [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_AllowanceForCreditLossesAsPercentageOfLoans_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Allowance for Credit Losses as Percentage of Loans</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_AllowanceForCreditLossesAsPercentageOfLoans_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Allowance For Credit Losses As Percentage Of Loans</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_AllowanceForCreditLossesAsPercentageOfLoans_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Allowance for credit losses as percentage of loans.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Held to Maturity, Gross Unrealized Losses</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Debt Securities, Held-to-Maturity, Accumulated Unrecognized Loss</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Finite-Lived Intangible Asset, Expected Amortization, Remainder of Fiscal Year</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Remaining 2026</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InternalCreditAssessmentDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Internal Credit Assessment</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InternalCreditAssessmentDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Internal Credit Assessment [Domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_CommercialRealEstateLoanMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Commercial Real Estate Loan [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_CommercialRealEstateLoanMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Commercial Real Estate Loan [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_CommercialRealEstateLoanMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Commercial real estate loan.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinancingReceivableAllowanceForCreditLosses_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel">Financing Receivable, Allowance for Credit Loss, Ending Balance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinancingReceivableAllowanceForCreditLosses_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel">Financing Receivable, Allowance for Credit Loss, Beginning Balance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinancingReceivableAllowanceForCreditLosses_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Financing Receivable, Allowance for Credit Losses on Loans</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinancingReceivableAllowanceForCreditLosses_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Financing Receivable, Allowance for Credit Loss</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityAddressAddressLine2_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Entity Address, Address Line Two</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityAddressAddressLine2_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Entity Address, Address Line Two</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueDisclosuresTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Fair Value</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueDisclosuresTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Fair Value Disclosures [Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PaymentsToAcquireHeldToMaturitySecurities_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Purchase of held to maturity securities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PaymentsToAcquireHeldToMaturitySecurities_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Payments to Acquire Held-to-Maturity Securities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DepreciationNonproduction_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Depreciation</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DepreciationNonproduction_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Depreciation, Nonproduction</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ExtendedMaturityMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Term Extension [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ExtendedMaturityMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Extended Maturity [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosureAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Derivative Instruments and Hedging Activities Disclosure [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_UnlikelyToBeCollectedFinancingReceivableMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Grade 9 [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_UnlikelyToBeCollectedFinancingReceivableMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Unlikely to be Collected Financing Receivable [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PlanNameDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Plan Name</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PlanNameDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Plan Name [Domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CashCashEquivalentsAndFederalFundsSold_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total cash and cash equivalents</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CashCashEquivalentsAndFederalFundsSold_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cash, Cash Equivalents, and Federal Funds Sold</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncreaseDecreaseInOtherOperatingAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Increase (Decrease) in Other Operating Assets, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncreaseDecreaseInOtherOperatingAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Increase (Decrease) in Other Operating Assets</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncreaseDecreaseInOtherOperatingAssets_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">(Increase) decrease in accrued interest receivable and other assets</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_FinancingReceivableAllowanceForCreditLossInitialAllowanceOnPurchasedSeasonedLoans_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Financing Receivable, Allowance for Credit Loss Initial Allowance on Purchased Seasoned Loans</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_FinancingReceivableAllowanceForCreditLossInitialAllowanceOnPurchasedSeasonedLoans_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Financing receivable, allowance for credit loss initial allowance on purchased seasoned loans.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_FinancingReceivableAllowanceForCreditLossInitialAllowanceOnPurchasedSeasonedLoans_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Initial allowance on purchased seasoned loans</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_StockIncentive2020PlanMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">2020 Stock Incentive Plan [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_StockIncentive2020PlanMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Stock Incentive2020 Plan [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_StockIncentive2020PlanMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Stock Incentive 2020 Plan.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_FinancingReceivableNonAccrualStatusMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Finance Receivable Nonaccrual Status [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_FinancingReceivableNonAccrualStatusMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Financing Receivable Non Accrual Status [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_FinancingReceivableNonAccrualStatusMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Non accrual status of financing receivable loans.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Available for Sale, fair value, due after ten years</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CreditFacilityAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Credit Facility</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CreditFacilityAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Credit Facility [Axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetChangeInterestBearingDepositsDomestic_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Net Change Interest-Bearing Deposits, Domestic</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetChangeInterestBearingDepositsDomestic_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Net decrease in interest-bearing deposits</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LoanRestructuringModificationAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Loan Restructuring Modification</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LoanRestructuringModificationAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Loan Restructuring Modification [Axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_LoansAndLeasesReceivableNetOfDeferredIncomeAndLoanReceivableCurrentPeriodGrossWriteOffsRevolvingLoansConvertedToTermLoans_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Current-period gross write-offs, Revolving Loans Converted to Term Loans</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_LoansAndLeasesReceivableNetOfDeferredIncomeAndLoanReceivableCurrentPeriodGrossWriteOffsRevolvingLoansConvertedToTermLoans_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Loans And Leases Receivable Net Of Deferred Income And Loan Receivable Current Period Gross Write offs Revolving Loans Converted To Term Loans</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_LoansAndLeasesReceivableNetOfDeferredIncomeAndLoanReceivableCurrentPeriodGrossWriteOffsRevolvingLoansConvertedToTermLoans_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Loans and leases receivable net of deferred income and loan receivable current period gross write offs revolving loans converted to term loans.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfLineOfCreditFacilitiesTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Schedule of Line of Credit Facilities [Table Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfLineOfCreditFacilitiesTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Summary of Commitments Associated with Outstanding Standby Letters of Credit, Unused Capacity on Warehouse Purchase Program Loans and Commitments to Extend Credit</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_PercentageOfInterestRateSwapWhichUsedLondonInterbankOfferedRateIndex_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Percentage of interest rate swap which used LIBOR as an index rate</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_PercentageOfInterestRateSwapWhichUsedLondonInterbankOfferedRateIndex_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Percentage of interest rate swap which used London Interbank Offered Rate index</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_PercentageOfInterestRateSwapWhichUsedLondonInterbankOfferedRateIndex_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Percentage of interest rate swap which used London Interbank Offered Rate index.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_LoansAndLeasesReceivableNetOfDeferredIncomeAndLoanReceivableCurrentPeriodGrossWriteoffsBeforeLatestFiscalYear_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Loans And Leases Receivable Net Of Deferred Income And Loan Receivable Current Period Gross Writeoffs Before Latest Fiscal Year</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_LoansAndLeasesReceivableNetOfDeferredIncomeAndLoanReceivableCurrentPeriodGrossWriteoffsBeforeLatestFiscalYear_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Loans and leases receivable net of deferred income and loan receivable current period gross writeoffs before latest fiscal year.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_LoansAndLeasesReceivableNetOfDeferredIncomeAndLoanReceivableCurrentPeriodGrossWriteoffsBeforeLatestFiscalYear_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Current-period gross write-offs, 2025</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CollateralizedSecuritiesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Collateralized Securities [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CollateralizedSecuritiesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Collateralized Securities [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_FinancialEffectOnModificationsMaidOnLoan_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Financial Effect</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_FinancialEffectOnModificationsMaidOnLoan_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Financial Effect on Modifications maid on Loan</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_FinancialEffectOnModificationsMaidOnLoan_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Financial Effect on Modifications maid on Loan</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinancingReceivableOriginatedInCurrentFiscalYear_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Financing Receivable, Year One, Originated, Current Fiscal Year</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinancingReceivableOriginatedInCurrentFiscalYear_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">2026</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_GainOnStockExchange_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Gain on stock exchange.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_GainOnStockExchange_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Gain on stock exchange</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_GainOnStockExchange_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Gain on Stock Exchange</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CashAndDueFromBanks_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Cash and Due from Banks, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CashAndDueFromBanks_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Cash and due from banks</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CashAndDueFromBanks_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cash and Due from Banks</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PastDueFinancingReceivablesTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Aging Analysis of Past Due Loans</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PastDueFinancingReceivablesTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Financing Receivable, Past Due [Table Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityAddressCityOrTown_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Entity Address, City or Town</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityAddressCityOrTown_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Entity Address, City or Town</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_CertainLoanAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldAccretion_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Accretion</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_CertainLoanAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldAccretion_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Certain Loan Acquired in Transfer Not Accounted for as Debt Securities Accretable Yield Accretion</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_CertainLoanAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldAccretion_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Certain loan acquired in transfer not accounted for as debt securities accretable yield accretion.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_UnusualRiskOrUncertaintyByNatureAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Unusual Risk or Uncertainty, Nature</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_UnusualRiskOrUncertaintyByNatureAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Unusual Risk or Uncertainty, Nature [Axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_FinancialEffectOnModificationsMaidOnLoanDueToPaymentDelay_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Financial effect on modifications maid on loan due to payment delay.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_FinancialEffectOnModificationsMaidOnLoanDueToPaymentDelay_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Financial Effect On Modifications Maid On Loan Due to Payment Delay</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_FinancialEffectOnModificationsMaidOnLoanDueToPaymentDelay_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Financial Effect on Payment Delay</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_SecurityExchangeName_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Security Exchange Name</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_SecurityExchangeName_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Security Exchange Name</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CreditFacilityDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Credit Facility</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CreditFacilityDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Credit Facility [Domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_RealEstateOwnedOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Real estate owned outstanding</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_RealEstateOwnedOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Real Estate Owned Outstanding</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_RealEstateOwnedOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">The amount of other real estate owned added during the period which is still outstanding.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_InterestRateSwapsAndLoansReceivableDescriptionOfIndexRateBasis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Interest rate swaps and loans portfolio description of index rate basis</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_InterestRateSwapsAndLoansReceivableDescriptionOfIndexRateBasis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Interest Rate Swaps And Loans Receivable Description Of Index Rate Basis</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_InterestRateSwapsAndLoansReceivableDescriptionOfIndexRateBasis_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Interest rate swaps and loans receivable description of index rate basis.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InterestExpenseDeposits_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Interest Expense, Deposits, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InterestExpenseDeposits_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Deposits</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InterestExpenseDeposits_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Interest Expense, Deposits</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_ScheduleOfUnrealizedLossOnInvestmentTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Securities in Continuous Loss Position</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_ScheduleOfUnrealizedLossOnInvestmentTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Schedule of Unrealized Loss on Investment [Table Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_ScheduleOfUnrealizedLossOnInvestmentTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Schedule of unrealized loss on investment.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NoninterestExpenseAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">NONINTEREST EXPENSE:</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NoninterestExpenseAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Noninterest Expense [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InterestExpenseSecuritiesSoldUnderAgreementsToRepurchase_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Securities sold under repurchase agreements</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InterestExpenseSecuritiesSoldUnderAgreementsToRepurchase_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Interest Expense, Securities Sold under Agreements to Repurchase</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ConversionOfStockDescription_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Conversion of stock, description</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ConversionOfStockDescription_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Conversion of Stock, Description</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_LesseeOperatingLeaseLiabilityUndiscountedLeasePayments_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total undiscounted lease payments</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_LesseeOperatingLeaseLiabilityUndiscountedLeasePayments_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Lessee Operating Lease Liability Undiscounted Lease Payments</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_LesseeOperatingLeaseLiabilityUndiscountedLeasePayments_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Lessee operating lease liability undiscounted lease payments.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_CounterpartyNameAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Counterparty Name</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_CounterpartyNameAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Counterparty Name [Axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">INCOME BEFORE INCOME TAXES</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_ChangesInAccretableYieldForPciAndNonPciLoansLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Changes In Accretable Yield for PCI And Non PCI Loans [Line Items]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_ChangesInAccretableYieldForPciAndNonPciLoansLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Changes In Accretable Yield for PCI And Non PCI Loans [Line Items]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_ChangesInAccretableYieldForPciAndNonPciLoansLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Changes In Accretable Yield For Pci And Non Pci Loans [Line Items]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_ChangesInAccretableYieldForPciAndNonPciLoansLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Changes in accretable yield for PCI and Non PCI loans.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ConcentrationRiskTypeDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Concentration Risk Type</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ConcentrationRiskTypeDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Concentration Risk Type [Domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccountsNotesLoansAndFinancingReceivableGrossAllowanceAndNetAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Accounts, Notes, Loans and Financing Receivable, Gross, Allowance, and Net [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_NoninterestIncomeServiceChargesOnDepositAccounts_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Service charges on deposit accounts</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_NoninterestIncomeServiceChargesOnDepositAccounts_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Noninterest Income Service Charges On Deposit Accounts</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_NoninterestIncomeServiceChargesOnDepositAccounts_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Noninterest income, service charges on deposit accounts.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DepositsAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Deposits:</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DepositsAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Deposits [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_AllowanceForLoanAndLeaseLossRecoveryWriteoffs_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Allowance for loan and lease loss, recovery (write-offs).</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_AllowanceForLoanAndLeaseLossRecoveryWriteoffs_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Allowance For Loan And Lease Loss Recovery Writeoffs</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_AllowanceForLoanAndLeaseLossRecoveryWriteoffs_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Recoveries</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InterestPaidNet_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Interest paid</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InterestPaidNet_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Interest Paid, Excluding Capitalized Interest, Operating Activity</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueByMeasurementBasisAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Carrying Amount [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueByMeasurementBasisAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Measurement Basis [Axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_RangeMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Statistical Measurement</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_RangeMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Statistical Measurement [Domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Derivatives not designated as hedging instruments</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_StellarBancorpIncMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Stellar Bancorp, Inc. [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_StellarBancorpIncMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Stellar Bancorp, Inc.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_StellarBancorpIncMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Stellar Bancorp Inc [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AllocatedShareBasedCompensationExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Stock-based compensation expense</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AllocatedShareBasedCompensationExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Payment Arrangement, Expense</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_DocumentPeriodEndDate_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Document Period End Date</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_DocumentPeriodEndDate_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Document Period End Date</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueMeasurementsFairValueHierarchyDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Fair Value Hierarchy and NAV</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueMeasurementsFairValueHierarchyDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Fair Value Hierarchy and NAV [Domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment, before Tax, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Total securities available for sale, before tax amount</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax_lbl" xlink:role="http://www.xbrl.org/2003/role/label">OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment, before Tax</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_LoansAndLeasesReceivableNetOfDeferredIncomeRelatedToWarehousePurchaseProgram_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Loans held for investment - Warehouse Purchase Program</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_LoansAndLeasesReceivableNetOfDeferredIncomeRelatedToWarehousePurchaseProgram_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Loans And Leases Receivable Net Of Deferred Income Related To Warehouse Purchase Program</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_LoansAndLeasesReceivableNetOfDeferredIncomeRelatedToWarehousePurchaseProgram_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Loans and leases receivable net of deferred income related to warehouse purchase program.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_LoansAndLeaseReceivableNetOfDeferredIncome_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Loans held for investment</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_LoansAndLeaseReceivableNetOfDeferredIncome_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Loans held for investment</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_LoansAndLeaseReceivableNetOfDeferredIncome_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Loans and Lease Receivable Net of Deferred Income</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_LoansAndLeaseReceivableNetOfDeferredIncome_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Loans and lease receivable net of deferred income.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_GainLossOnSaleOfPropertyPlantEquipment_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Gain (Loss) on Disposition of Property Plant Equipment, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_GainLossOnSaleOfPropertyPlantEquipment_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Gain (Loss) on Disposition of Property Plant Equipment</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_GainLossOnSaleOfPropertyPlantEquipment_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Net (gain) loss on sale or write down of premises and equipment</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CreditLossStatusDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Credit Loss Status</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CreditLossStatusDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Credit Loss Status [Domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_NetIncreaseDecreaseInSecuritiesSoldUnderRepurchaseAgreements_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Net decrease in securities sold under repurchase agreements</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_NetIncreaseDecreaseInSecuritiesSoldUnderRepurchaseAgreements_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Net Increase (Decrease) in Securities Sold under Repurchase Agreements</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_NetIncreaseDecreaseInSecuritiesSoldUnderRepurchaseAgreements_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Net increase (decrease) in securities sold under repurchase agreements.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StatementOfFinancialPositionAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Statement of Financial Position [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_ConsumerAndOtherMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Consumer and Other [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_ConsumerAndOtherMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Consumer And Other [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_ConsumerAndOtherMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Related to the consumer and other portfolio segment.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LossContingenciesByNatureOfContingencyAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Loss Contingency Nature</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LossContingenciesByNatureOfContingencyAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Loss Contingency Nature [Axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AgriculturalSectorMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Agriculture [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AgriculturalSectorMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Agricultural Sector [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LossContingencyNatureDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Loss Contingency, Nature</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LossContingencyNatureDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Loss Contingency, Nature [Domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StatementClassOfStockAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Class of Stock [Axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_FinancingReceivableRatioOfNonperformingLoansToAllLoansAndOtherRealEstate_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Financing Receivable Ratio of Nonperforming Loans to All Loans and Other Real Estate</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_FinancingReceivableRatioOfNonperformingLoansToAllLoansAndOtherRealEstate_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Financing Receivable Ratio Of Nonperforming Loans To All Loans And Other Real Estate</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_FinancingReceivableRatioOfNonperformingLoansToAllLoansAndOtherRealEstate_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Financing receivable ratio of nonperforming loans to all loans and other real estate.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherRealEstateAdditions_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Other real estate, additions</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherRealEstateAdditions_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Other Real Estate, Additions</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LoansAndLeasesReceivableImpairedInterestLostOnNonaccrualLoans_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Loans and Leases Receivable, Impaired, Interest Lost on Nonaccrual Loans</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LoansAndLeasesReceivableImpairedInterestLostOnNonaccrualLoans_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Loans and Leases Receivable, Impaired, Interest Lost on Nonaccrual Loans</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinancingReceivablesPeriodPastDueDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Financial Asset, Aging</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinancingReceivablesPeriodPastDueDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Financial Asset, Aging [Domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Fair Values Derivatives Balance Sheet Location By Derivative Contract Type By Hedging Designation [Table]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_Liabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total liabilities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_Liabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Liabilities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_USGovernmentDebtSecuritiesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">US Government Debt Securities [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_USGovernmentDebtSecuritiesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">U.S. Government agencies [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_USGovernmentDebtSecuritiesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">U.S. Government Agencies [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Financial Instruments</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Financial Instruments [Domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_Communication_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Communications</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_Communication_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Communication</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearNetCarryingAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Held to Maturity, amortized cost, due in one year or less</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearNetCarryingAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, Year One</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Held to Maturity, fair value, due in one year or less</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, Year One</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Lessee, Operating Lease, Liability, to be Paid, Year Two</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">2028</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DerivativeInstrumentsGainLossLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Derivative Instruments Gain Loss [Line Items]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DerivativeInstrumentsGainLossLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Derivative Instruments, Gain (Loss) [Line Items]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinancingReceivableCreditQualityIndicatorsTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Risk Grade by Category of Loan and Year of Origination/Renewal</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinancingReceivableCreditQualityIndicatorsTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Financing Receivable Credit Quality Indicators [Table Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RestrictedStockMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Restricted Stock [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RestrictedStockMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Restricted Stock [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_SecuritiesConcentrationRiskMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Securities Concentration Risk [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_SecuritiesConcentrationRiskMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Securities Concentration Risk [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_SecuritiesConcentrationRiskMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Related to securities concentration risk.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Available for Sale, Unrealized Losses, Less than 12 Months</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Weighted Average Number of Shares Outstanding, Diluted, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Weighted Average Number of Shares Outstanding, Diluted</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Weighted average shares outstanding, Diluted (in shares)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityFileNumber_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Securities Act File Number</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityFileNumber_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Entity File Number</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax_lbl" xlink:role="http://www.xbrl.org/2003/role/label">OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, after Tax</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Change in unrealized gain during period, net of tax amount</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Other Assets, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Other assets</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Other Assets</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfDerivativeInstrumentsGainLossInStatementOfFinancialPerformanceTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Schedule of Income (Loss) from Derivatives Not Designated as Hedging Instruments</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfDerivativeInstrumentsGainLossInStatementOfFinancialPerformanceTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Derivative Instruments, Gain (Loss) [Table Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_CoverAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cover [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_Grade3Member_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Grade 3 [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_Grade3Member_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Grade3 [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_Grade3Member_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Related to grade 3 receivables.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SubordinatedDebtMember_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Subordinated Debentures [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SubordinatedDebtMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Subordinated Notes [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SubordinatedDebtMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Subordinated Debt [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinancingReceivablesPeriodPastDueAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Financing Receivables, 30 to 89 Days Past Due [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinancingReceivablesPeriodPastDueAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Financial Asset, Aging [Axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesDiscount_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Discount</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesDiscount_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Discount</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesDiscount_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Discount applied to loans acquired with deteriorated credit quality.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Held to Maturity, fair value, mortgage-backed securities and collateralized mortgage obligations</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Debt Securities, Held-to-Maturity, Maturity, without Single Maturity Date, Fair Value</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_FinancialEffectOnModificationsMaidOnLoanDueToInterestRateReduction_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Financial effect on modifications maid on loan due to interest rate reduction.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_FinancialEffectOnModificationsMaidOnLoanDueToInterestRateReduction_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Financial Effect On Modifications Maid On Loan Due to Interest Rate Reduction</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_FinancialEffectOnModificationsMaidOnLoanDueToInterestRateReduction_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Financial Effect on Interest Rate Reduction</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Common shares authorized for issuance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_SubstandardAndNonImpairedMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Grade 6 [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_SubstandardAndNonImpairedMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Substandard And Non Impaired [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_SubstandardAndNonImpairedMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Substandard and non-impaired.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_MortgageBackedSecuritiesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Mortgage-backed Securities [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_MortgageBackedSecuritiesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Mortgage-backed Securities [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_MortgageBackedSecuritiesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Collateralized Mortgage-Backed Securities [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_LoansAndLeasesReceivableNetOfDeferredIncomeAndLoanReceivableCurrentPeriodGrossWriteoffsRevolvingLoans_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Current-period gross write-offs, Revolving Loans</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_LoansAndLeasesReceivableNetOfDeferredIncomeAndLoanReceivableCurrentPeriodGrossWriteoffsRevolvingLoans_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Loans And Leases Receivable Net Of Deferred Income And Loan Receivable Current Period Gross Writeoffs Revolving Loans</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_LoansAndLeasesReceivableNetOfDeferredIncomeAndLoanReceivableCurrentPeriodGrossWriteoffsRevolvingLoans_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Loans and leases receivable net of deferred income and loan receivable current period gross writeoffs revolving loans.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockIssuedDuringPeriodSharesAcquisitions_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Common stock issued in connection with the acquisition (in shares)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockIssuedDuringPeriodSharesAcquisitions_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Stock Issued During Period, Shares, Acquisitions</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockIssuedDuringPeriodSharesAcquisitions_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Common stock issued in connection with the acquisition</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StandbyLettersOfCreditMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Standby Letters of Credit [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StandbyLettersOfCreditMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Standby Letters of Credit [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedNumberOfShares_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested, Number of Shares</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedNumberOfShares_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Shares vested</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_UnusedLinesOfCreditMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Unused capacity on Warehouse Purchase Program loans [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_UnusedLinesOfCreditMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Unused lines of Credit [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Share issued</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Compensation Arrangement by Share-Based Payment Award, Shares Issued in Period</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RealEstateSectorMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Real Estate [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RealEstateSectorMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Real Estate Sector [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FiniteLivedIntangibleAssetsNet_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Core deposit intangibles</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FiniteLivedIntangibleAssetsNet_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FiniteLivedIntangibleAssetsNet_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Core deposit intangibles, net</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FiniteLivedIntangibleAssetsNet_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel">Core Deposit Intangibles, Beginning balance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FiniteLivedIntangibleAssetsNet_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel">Core Deposit Intangibles, Ending balance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FiniteLivedIntangibleAssetsNet_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Finite-Lived Intangible Assets, Net</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_LoansAndLeasesReceivableNetOfDeferredIncomeAndLoanReceivableCurrentPeriodGrossWriteoffsThreeYearsBeforeLatestFiscalYear_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Loans And Leases Receivable Net Of Deferred Income And Loan Receivable Current Period Gross Writeoffs Three Years Before Latest Fiscal Year</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_LoansAndLeasesReceivableNetOfDeferredIncomeAndLoanReceivableCurrentPeriodGrossWriteoffsThreeYearsBeforeLatestFiscalYear_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Loans and leases receivable net of deferred income and loan receivable current period gross writeoffs three years before latest fiscal year</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_LoansAndLeasesReceivableNetOfDeferredIncomeAndLoanReceivableCurrentPeriodGrossWriteoffsThreeYearsBeforeLatestFiscalYear_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Current-period gross write-offs, 2023</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_Grade4Member_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Grade 4 [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_Grade4Member_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Grade4 [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_Grade4Member_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Related to grade 4 receivables.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_ContractualObligationsAndOffBalanceSheetItemsLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Contractual Obligations And Off Balance Sheet Items [Line Items]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_ContractualObligationsAndOffBalanceSheetItemsLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Contractual Obligations And Off Balance Sheet Items [Line Items]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_ContractualObligationsAndOffBalanceSheetItemsLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Contractual obligations and off balance sheet items.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinancingReceivableModificationsNumberOfContracts2_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Financing receivable, modifications, number of contract</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinancingReceivableModificationsNumberOfContracts2_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Financing Receivable, Modifications, Number of Contracts</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_TroubledDebtRestructuringMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Troubled Debt Restructuring [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_TroubledDebtRestructuringMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Troubled Debt Restructuring [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_TroubledDebtRestructuringMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Related to troubled debt restructurings.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Accounting Standards Updates (''ASU'')</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">New Accounting Pronouncements, Policy [Policy Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityMaturityTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Future Undiscounted Cash Payments Associated with its Operating Leases</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityMaturityTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Lessee, Operating Lease, Liability, to be Paid, Maturity [Table Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_ScheduleOfIntangibleAssetsAndGoodwillTable_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Schedule Of Intangible Assets And Goodwill [Table]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_ScheduleOfIntangibleAssetsAndGoodwillTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Schedule Of Intangible Assets And Goodwill [Table]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_ScheduleOfIntangibleAssetsAndGoodwillTable_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Schedule of intangible assets and goodwill.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Derivative Instruments Gain Loss By Hedging Relationship By Income Statement Location By Derivative Instrument Risk [Table]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Derivative Instruments, Gain (Loss) [Table]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_GainLossOnDispositionOfAssets1_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Gain (Loss) on Disposition of Assets, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_GainLossOnDispositionOfAssets1_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Gain (Loss) on Disposition of Assets</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_GainLossOnDispositionOfAssets1_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Net gain (loss) on sale or write-down of assets</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfComprehensiveIncomeLossTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Comprehensive Income (Loss) [Table Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfComprehensiveIncomeLossTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Tax Effects Allocated to Each Component of Other Comprehensive Income</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ComprehensiveIncomeNoteTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Comprehensive Income (Loss) Note [Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ComprehensiveIncomeNoteTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Other Comprehensive Income</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_LoansAndLeasesReceivableNetOfDeferredIncomeAndLoanReceivableCurrentPeriodGrossWriteoffsFourYearsBeforeLatestFiscalYear_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Loans And Leases Receivable Net Of Deferred Income And Loan Receivable Current Period Gross Writeoffs Four Years Before Latest Fiscal Year</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_LoansAndLeasesReceivableNetOfDeferredIncomeAndLoanReceivableCurrentPeriodGrossWriteoffsFourYearsBeforeLatestFiscalYear_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Loans And Leases Receivable Net Of Deferred Income And Loan Receivable Current Period Gross Writeoffs Four Years Before Latest Fiscal Year</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_LoansAndLeasesReceivableNetOfDeferredIncomeAndLoanReceivableCurrentPeriodGrossWriteoffsFourYearsBeforeLatestFiscalYear_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Current-period gross write-offs, 2022</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ProvisionForLoanAndLeaseLosses_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Provision for credit losses on loans</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ProvisionForLoanAndLeaseLosses_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Provision for credit losses</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ProvisionForLoanAndLeaseLosses_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Provision for Loan and Lease Losses</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CarryingReportedAmountFairValueDisclosureMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Carrying Amount [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CarryingReportedAmountFairValueDisclosureMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Reported Value Measurement [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockSharesOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel">Common Stock, Shares, Outstanding, Ending Balance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockSharesOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel">Common Stock, Shares, Outstanding, Beginning Balance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockSharesOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Common stock, shares outstanding (in shares)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockSharesOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Common Stock, Shares, Outstanding</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AllowanceForLoanAndLeaseLossesWriteoffsNet_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Net charge-offs</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AllowanceForLoanAndLeaseLossesWriteoffsNet_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Allowance for Loan and Lease Losses, Writeoff, Net</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AllowanceForLoanAndLeaseLossesWriteoffsNet_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedTotalLabel">Net (charge-offs) recoveries</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_DocumentTransitionReport_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Document Transition Report</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_DocumentTransitionReport_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Document Transition Report</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_NonperformingFinancingReceivableAssetsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Nonperforming Financial Instruments [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_NonperformingFinancingReceivableAssetsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Nonperforming Financing Receivable Assets [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_NonperformingFinancingReceivableAssetsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Category status of financial instruments in which payments are past due in accordance with the terms of the contract. Financial instruments include, but are not limited to, financing receivables, loans, debt, and investments.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_HeldToMaturitySecuritiesFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Held to maturity securities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_HeldToMaturitySecuritiesFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Held to Maturity</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_HeldToMaturitySecuritiesFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Held to Maturity, fair value, total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_HeldToMaturitySecuritiesFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Held to maturity securities, fair value</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfCapitalizationEquityTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Capitalization, Equity [Table]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_AgricultureAndAgricultureRealEstateIncludesFarmlandMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Agriculture And Agriculture Real Estate Includes Farmland [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_AgricultureAndAgricultureRealEstateIncludesFarmlandMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Related to the agriculture and agriculture real estate portfolio segment that includes farmland.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_AgricultureAndAgricultureRealEstateIncludesFarmlandMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Agriculture [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_AgricultureAndAgricultureRealEstateIncludesFarmlandMember_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Agriculture And Agriculture Real Estate Includes Farmland [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PaymentsForRepurchaseOfCommonStock_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Repurchase of common stock</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PaymentsForRepurchaseOfCommonStock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Payments for Repurchase of Common Stock</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StatementOfCashFlowsAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Statement of Cash Flows [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AssetsFairValueDisclosureAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Assets</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AssetsFairValueDisclosureAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Assets, Fair Value Disclosure [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BrokerageCommissionsRevenue_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Brokerage income</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BrokerageCommissionsRevenue_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Brokerage Commissions Revenue</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Payments to Acquire Businesses, Net of Cash Acquired</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Payments to Acquire Businesses, Net of Cash Acquired, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Net cash provided by the acquisition</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InterestRateSwapMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Interest Rate Swap [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InterestRateSwapMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Interest Rate Swap [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Schedule Of Accounts Notes Loans And Financing Receivable [Table]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Accounts and Financing Receivables [Table]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FiniteLivedIntangibleAssetsLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Finite-Lived Intangible Assets [Line Items]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EarningsPerShareTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Income Per Common Share</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EarningsPerShareTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Earnings Per Share [Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SharesIssued_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel">BALANCE (in shares)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SharesIssued_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel">BALANCE (in shares)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SharesIssued_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Shares, Issued</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_AllowanceForLoanAndLeaseLossesGeneralReserves_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">General reserve</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_AllowanceForLoanAndLeaseLossesGeneralReserves_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Allowance For Loan And Lease Losses General Reserves</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_AllowanceForLoanAndLeaseLossesGeneralReserves_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Allowance for loan and lease losses general reserves.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetIncomeLoss_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Net income</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetIncomeLoss_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">NET INCOME</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_InterestExpenseSubordinatedNotesAndJuniorSubordinatedDebentures_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Interest expense subordinated notes and junior subordinated debentures</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_InterestExpenseSubordinatedNotesAndJuniorSubordinatedDebentures_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Interest expense subordinated notes and junior subordinated debentures.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_InterestExpenseSubordinatedNotesAndJuniorSubordinatedDebentures_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Subordinated notes and junior subordinated debentures</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtAndEquitySecuritiesGainLoss_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Net gain on sale or write-up of securities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtAndEquitySecuritiesGainLoss_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Debt and Equity Securities, Gain (Loss)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtAndEquitySecuritiesGainLoss_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Debt and Equity Securities, Gain (Loss), Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_ScheduleOfNonperformingAssetsTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Non-performing Assets</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_ScheduleOfNonperformingAssetsTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Schedule Of Nonperforming Assets Table [Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_ScheduleOfNonperformingAssetsTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Tabular disclosure of nonperforming loans and other assets.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_NetAccretionOfDiscountOnLoans_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Net accretion of discount on loans</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_NetAccretionOfDiscountOnLoans_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Net Accretion Of Discount On Loans</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_NetAccretionOfDiscountOnLoans_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Net accretion of discount on loans.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ContractualObligationDueInSecondAndThirdYear_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">More than 1 year but less than 3 years</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ContractualObligationDueInSecondAndThirdYear_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Contractual Obligation, to be Paid, Year Two and Three, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ContractualObligationDueInSecondAndThirdYear_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Contractual Obligation, to be Paid, Year Two and Three</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLeasePayments_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Operating lease, payments</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLeasePayments_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Operating Lease, Payments</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DerivativesFairValueLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Derivatives Fair Value [Line Items]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DerivativesFairValueLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Derivatives, Fair Value [Line Items]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AssetsAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">ASSETS</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AssetsAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Assets [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_FirstBancsharesOfTexasIncMember_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">First Bancshares Merger [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_FirstBancsharesOfTexasIncMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">First Bancshares of Texas, Inc. [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_FirstBancsharesOfTexasIncMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">First Bancshares Of Texas Inc [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_FirstBancsharesOfTexasIncMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">First Bancshares of Texas Inc.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FederalHomeLoanBankStock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Federal Home Loan Bank of Dallas stock</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FederalHomeLoanBankStock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Federal Home Loan Bank Stock</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AmortizationOfFinancingCostsAndDiscounts_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Amortization of Debt Issuance Costs and Discounts, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AmortizationOfFinancingCostsAndDiscounts_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Net amortization of premium on investments</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AmortizationOfFinancingCostsAndDiscounts_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Amortization of Debt Issuance Costs and Discounts</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_DocumentFiscalYearFocus_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Document Fiscal Year Focus</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_DocumentFiscalYearFocus_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Document Fiscal Year Focus</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PaymentsForOriginationAndPurchasesOfLoansHeldForSale_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Payments for Origination and Purchases of Loans Held-for-sale, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PaymentsForOriginationAndPurchasesOfLoansHeldForSale_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Originations of loans held for sale</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PaymentsForOriginationAndPurchasesOfLoansHeldForSale_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Payment for Origination and Purchase, Loan, Held-for-Sale</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfAccumulatedOtherComprehensiveIncomeLossTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfAccumulatedOtherComprehensiveIncomeLossTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Activity in Accumulated Other Comprehensive Income Associated with Securities Available for Sale, Net of Tax</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ConcentrationRiskBenchmarkDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Concentration Risk Benchmark</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ConcentrationRiskBenchmarkDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Concentration Risk Benchmark [Domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">CASH FLOWS FROM INVESTING ACTIVITIES:</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InvestmentsInDebtAndMarketableEquitySecuritiesAndCertainTradingAssetsDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Securities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InvestmentsInDebtAndMarketableEquitySecuritiesAndCertainTradingAssetsDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NewAccountingPronouncementsAndChangesInAccountingPrinciplesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Accounting Standards Update and Change in Accounting Principle [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ProceedsFromSaleOfProductiveAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Proceeds from Sale of Productive Assets, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ProceedsFromSaleOfProductiveAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Proceeds from sale of bank premises, equipment and other real estate</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ProceedsFromSaleOfProductiveAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Proceeds from Sale of Productive Assets</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ConversionOfStockByUniqueDescriptionAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Stock Conversion Description [Axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Finite-Lived Intangible Asset, Expected Amortization, Year One</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">2027</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinancialAssetAcquiredWithCreditDeteriorationMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">PCD Loans [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinancialAssetAcquiredWithCreditDeteriorationMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Financial Asset Acquired with Credit Deterioration [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Other Liabilities, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Other liabilities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Other Liabilities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueDisclosuresAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Fair Value Disclosures [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommitmentsAndContingenciesDisclosureAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Commitments and Contingencies Disclosure [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockIssuedDuringPeriodValueAcquisitions_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Common stock issued in connection with the acquisition</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockIssuedDuringPeriodValueAcquisitions_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Stock Issued During Period, Value, Acquisitions</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockIssuedDuringPeriodValueAcquisitions_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Common stock issued in connection with the acquisition</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_StockIncentive2012PlanMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">2012 Stock Incentive Plan [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_StockIncentive2012PlanMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Stock Incentive2012 Plan [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_StockIncentive2012PlanMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Related to the 2012 stock incentive plan.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Lessee, Operating Lease, Liability, to be Paid, Year One</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">2027</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessAcquisitionProFormaInformationTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Summary of Pro Forma Information</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DerivativeInstrumentRiskAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Derivative Instrument</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DerivativeInstrumentRiskAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Derivative Instrument [Axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Thereafter</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Lessee, Operating Lease, Liability, to be Paid, after Year Five</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Payment Arrangement [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Total unrecognized compensation expense related to stock-based compensation arrangements</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AvailableForSaleSecuritiesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Available for sale securities:</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AvailableForSaleSecuritiesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Debt Securities, Available-for-Sale [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ConcentrationRiskPercentage1_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Concentration Risk, Percentage</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ConcentrationRiskPercentage1_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Concentration Risk, Percentage</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetCashProvidedByUsedInInvestingActivities_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cash Provided by (Used in) Investing Activity, Including Discontinued Operation</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetCashProvidedByUsedInInvestingActivities_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Net cash (used in) provided by investing activities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_Security12bTitle_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Title of 12(b) Security</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_Security12bTitle_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Title of 12(b) Security</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Derivative Instruments and Hedging Activities Disclosure [Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Derivative Financial Instruments</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithoutSingleMaturityDateNetCarryingAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Held to Maturity, amortized cost, mortgage-backed securities and collateralized mortgage obligations</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithoutSingleMaturityDateNetCarryingAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, without Single Maturity Date</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Available for Sale, amortized cost, due after one year through five years</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year One Through Five</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Lessee, Operating Lease, Liability, to be Paid, Remainder of Fiscal Year</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Remaining 2026</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_ProvisionForCreditLosses_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">PROVISION FOR CREDIT LOSSES</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_ProvisionForCreditLosses_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Provision for credit losses</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_ProvisionForCreditLosses_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Provision For Credit Losses</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_ProvisionForCreditLosses_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Provision for credit losses.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Available for Sale, fair value, due after one year through five years</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessAcquisitionSharePrice_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Business Combination, Price Per Share</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessAcquisitionSharePrice_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Closing price</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessAcquisitionSharePrice_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Business acquisition, closing share price</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Held to Maturity, fair value, due after one year through five years</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Table]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Fair Value, Recurring and Nonrecurring [Table]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessCombinationDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Business Combination [Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessCombinationDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Acquisitions</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_PurchasedAndNonPurchasedCreditImpairedLoansLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Purchased And Non Purchased Credit Impaired Loans [Line Items]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_PurchasedAndNonPurchasedCreditImpairedLoansLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Purchased And Non Purchased Credit Impaired Loans [Line Items]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_PurchasedAndNonPurchasedCreditImpairedLoansLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Purchased and non-purchased credit impaired loans.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AdditionalPaidInCapitalMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Capital Surplus [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AdditionalPaidInCapitalMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Additional Paid-in Capital [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Increase (Decrease) in Accrued Liabilities and Other Operating Liabilities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Increase (decrease) in accrued interest payable and other liabilities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_NumberOfLoanProductionOffices_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Number Of Loan Production Offices</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_NumberOfLoanProductionOffices_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Number of loan production offices.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_NumberOfLoanProductionOffices_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Number of loan production offices</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Held to Maturity, fair value, due after five years through ten years</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueMeasurementFrequencyDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Measurement Frequency</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueMeasurementFrequencyDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Measurement Frequency [Domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_TradingSymbol_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Trading Symbol</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_TradingSymbol_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Trading Symbol</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Intangible Asset, Finite-Lived [Table]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_PercentageOfLoansRelatedToSingleIndustryOnLoans_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Percentage of Loans Related to Single Industry on Loans</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_PercentageOfLoansRelatedToSingleIndustryOnLoans_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Percentage Of Loans Related To Single Industry On Loans</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_PercentageOfLoansRelatedToSingleIndustryOnLoans_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Percentage of loans related to single industry on total loans.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_RecordedInvestmentAndOutstandingBalanceForPurchasedCreditDeterioratedLoansAndNonPurchasedCreditDeterioratedLoansTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Recorded Investment and Outstanding Balance for Purchased Credit Deteriorated Loans and Non Purchased Credit Deteriorated Loans</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_RecordedInvestmentAndOutstandingBalanceForPurchasedCreditDeterioratedLoansAndNonPurchasedCreditDeterioratedLoansTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Recorded Investment And Outstanding Balance For Purchased Credit Deteriorated Loans And Non Purchased Credit Deteriorated Loans [Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_RecordedInvestmentAndOutstandingBalanceForPurchasedCreditDeterioratedLoansAndNonPurchasedCreditDeterioratedLoansTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Schedule of recorded investment and outstanding balance for purchased credit deteriorated loans and non purchased credit deteriorated loans.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Available for Sale, amortized cost, due in one year or less</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, Year One</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AllowanceForCreditLossesOnFinancingReceivablesTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Allowance for Credit Losses on Loans by Category of Loan</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AllowanceForCreditLossesOnFinancingReceivablesTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Financing Receivable, Allowance for Credit Loss [Table Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_SouthwestMergerMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Southwest Merger.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_SouthwestMergerMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Southwest Merger [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">CASH FLOWS FROM FINANCING ACTIVITIES:</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CollateralizedMortgageObligationsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Collateralized Mortgage Obligations [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CollateralizedMortgageObligationsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Collateralized Mortgage Obligations [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueMeasurementsRecurringMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Fair Value, Measurements, Recurring [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueMeasurementsRecurringMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Fair Value, Recurring [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfImpairedFinancingReceivableTable_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Schedule Of Impaired Financing Receivable [Table]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfImpairedFinancingReceivableTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Schedule of Impaired Financing Receivable [Table]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_ScheduleOfRelatedPartyLoansTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Related Party Loans</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_ScheduleOfRelatedPartyLoansTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Schedule Of Related Party Loans Table [Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_ScheduleOfRelatedPartyLoansTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Tabular disclosure of loans with parties related to the entity.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccountingStandardsUpdate201613Member_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Accounting Standards Update 2016-13 [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccountingStandardsUpdate201613Member_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Accounting Standards Update 2016-13 [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinancingReceivablePortfolioSegmentDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Financing Receivable Portfolio Segment</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinancingReceivablePortfolioSegmentDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Financing Receivable Portfolio Segment [Domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_PurchasedAndNonPurchasedCreditImpairedLoansTable_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Purchased And Non Purchased Credit Impaired Loans [Table]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_PurchasedAndNonPurchasedCreditImpairedLoansTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Purchased And Non Purchased Credit Impaired Loans [Table]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_PurchasedAndNonPurchasedCreditImpairedLoansTable_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Purchased And Non Purchased Credit Impaired Loans Table</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_GoodwillAndIntangibleAssetImpairment_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Goodwill and Intangible Asset Impairment, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_GoodwillAndIntangibleAssetImpairment_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Impairment recorded on goodwill and core deposit intangibles</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_GoodwillAndIntangibleAssetImpairment_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Goodwill and Intangible Asset Impairment</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InterestAndDividendIncomeSecurities_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Interest and Dividend Income, Securities, Operating, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InterestAndDividendIncomeSecurities_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Securities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InterestAndDividendIncomeSecurities_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Interest and Dividend Income, Securities, Operating</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ConversionOfStockNameDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Conversion of Stock, Name [Domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StatementEquityComponentsAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Equity Components</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StatementEquityComponentsAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Equity Components [Axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherBorrowings_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Other borrowings</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherBorrowings_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Other borrowings</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherBorrowings_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Other Borrowings</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinancingReceivableRevolving_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Revolving Loans</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinancingReceivableRevolving_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Financing Receivable, Revolving</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EquityComponentDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Equity Component</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EquityComponentDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Equity Component [Domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueByAssetClassAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Asset Class</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueByAssetClassAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Asset Class [Axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_ClassB2CommonStockMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Class B-2 Common Stock [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_ClassB2CommonStockMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Class B-2 Common Stock.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Notes to Financial Statements</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_ResidentialMortgageLoansMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Related to residential mortgage loans.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherNoninterestExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Other</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherNoninterestExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Other Noninterest Expense</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfRecognizedIdentifiedAssetsAcquiredAndLiabilitiesAssumedTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Summary of Assets and Liabilities Recorded on Consolidated Balance Sheet at Estimated Fair Value on Acquisition Date</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfRecognizedIdentifiedAssetsAcquiredAndLiabilitiesAssumedTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Business Combination, Recognized Asset Acquired and Liability Assumed [Table Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherRealEstate_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel">Other Real Estate, Ending Balance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherRealEstate_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel">Other Real Estate, Beginning Balance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherRealEstate_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Other Real Estate, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherRealEstate_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Other real estate owned</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherRealEstate_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Other Real Estate</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ContractualObligationDueInFourthAndFifthYear_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Contractual Obligation, to be Paid, Year Four and Five, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ContractualObligationDueInFourthAndFifthYear_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">3 years or more but less than 5 years</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ContractualObligationDueInFourthAndFifthYear_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Contractual Obligation, to be Paid, Year Four and Five</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_LoansAndLeaseReceivableNetReportedAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Loans</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_LoansAndLeaseReceivableNetReportedAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Loans, net</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_LoansAndLeaseReceivableNetReportedAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Loans and Lease Receivable Net Reported Amount</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_LoansAndLeaseReceivableNetReportedAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Loans and lease receivable net reported amount.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BankOwnedLifeInsurance_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Bank owned life insurance (BOLI)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BankOwnedLifeInsurance_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Bank Owned Life Insurance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessAcquisitionAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Business Acquisition</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessAcquisitionAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Business Combination [Axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Available for Sale, amortized cost, due after five years through ten years</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Common stock issued in connection with the issuance (forfeiture) of restricted stock awards, net (in shares)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Common stock issued (forfeited) in connection with the granting of restricted stock awards, net (in shares)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_MajorCustomersAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Customer [Axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_MinimumPercentageOfIncomeTaxPaymentNetOfRefundsReceived_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Minimum percentage of income tax payment net of refunds received</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_MinimumPercentageOfIncomeTaxPaymentNetOfRefundsReceived_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Minimum percentage of income tax payment net of refunds received</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StatementOfIncomeAndComprehensiveIncomeAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Statement of Comprehensive Income [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_HeldToMaturitySecuritiesContinuousUnrealizedLossPositions12MonthsOrLongerAccumulatedLoss_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Held to Maturity, Unrealized Losses, 12 Months or More</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_HeldToMaturitySecuritiesContinuousUnrealizedLossPositions12MonthsOrLongerAccumulatedLoss_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Held to Maturity Securities Continuous Unrealized Loss Positions 12 Months Or Longer Accumulated Loss</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_HeldToMaturitySecuritiesContinuousUnrealizedLossPositions12MonthsOrLongerAccumulatedLoss_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Held to maturity securities continuous unrealized loss positions 12 months or longer accumulated loss.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_NetAccretionOfDiscountOnDeposits_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Net amortization of premium on deposits</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_NetAccretionOfDiscountOnDeposits_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Net Accretion Of Discount On Deposits</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_NetAccretionOfDiscountOnDeposits_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Net accretion of discount on deposits.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_MaximumMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Maximum [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_MaximumMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Maximum [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DerivativeCollateralObligationToReturnCash_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Cash collateral pledged</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DerivativeCollateralObligationToReturnCash_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Derivative Asset, Subject to Master Netting Arrangement, Collateral, Obligation to Return Cash Not Offset</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_RangeAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Statistical Measurement</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_RangeAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Statistical Measurement [Axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockValue_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Common Stock, Value, Issued</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockValue_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Common stock, $1 par value; 200,000,000 shares authorized; 100,835,022 issued and outstanding at March 31, 2026; 93,058,171 shares issued and outstanding at December 31, 2025</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_NumberOfInvestmentSecuritiesSegments_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Number of Investment Securities Segments</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_NumberOfInvestmentSecuritiesSegments_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Number Of Investment Securities Segments</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_NumberOfInvestmentSecuritiesSegments_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">The number of segments of investment securities held in a portfolio by an entity.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfFinancingReceivableAllowanceForCreditLossesTable_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Schedule Of Financing Receivable Allowance For Credit Losses [Table]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfFinancingReceivableAllowanceForCreditLossesTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Financing Receivable, Allowance for Credit Loss [Table]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_FinancingReceivableNonaccrualToOutstandingPercent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Nonaccrual loans to total loans</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_FinancingReceivableNonaccrualToOutstandingPercent_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Financing Receivable, Nonaccrual to Outstanding, Percent</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_MarketableSecuritiesLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Marketable Securities [Line Items]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_CARESActMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">CARES Act [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_CARESActMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">C A R E S Act [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_CARESActMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">As a result of COVID-19 Pandemic, the CARES Act was signed into law on March 27, 2020 by the President of the United States. The CARES Act provides assistance for American workers, families and small businesses.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_DebtSecuritiesHeldToMaturityCreditLoss_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Credit losses</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_DebtSecuritiesHeldToMaturityCreditLoss_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Debt Securities Held To Maturity Credit Loss</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_DebtSecuritiesHeldToMaturityCreditLoss_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Debt securities, held-to-maturity credit loss.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockholdersEquityTotalMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Stockholders' Equity, Total [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockholdersEquityTotalMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Stockholders' Equity, Total [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleofFiniteLivedIntangibleAssetsFutureAmortizationExpenseTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Estimated Aggregate Future Amortization Expense for Core Deposit Intangibles</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleofFiniteLivedIntangibleAssetsFutureAmortizationExpenseTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinancingReceivablePurchasedWithCreditDeteriorationAllowanceForCreditLossAtAcquisitionDate_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Allowance on PSLs at acquisition</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinancingReceivablePurchasedWithCreditDeteriorationAllowanceForCreditLossAtAcquisitionDate_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Financing Receivable, Purchased with Credit Deterioration, Allowance for Credit Loss at Acquisition Date</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinancingReceivablePurchasedWithCreditDeteriorationAmountAtPurchasePrice_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Initial allowance on loans purchased with credit deterioration</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinancingReceivablePurchasedWithCreditDeteriorationAmountAtPurchasePrice_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Financing Receivable, Purchased with Credit Deterioration, Amount at Purchase Price</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinancingReceivablePurchasedWithCreditDeteriorationAmountAtPurchasePrice_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Financing Receivable, Purchased with Credit Deterioration, Amount at Purchase Price, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PreferredStockSharesAuthorized_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Preferred stock, shares authorized (in shares)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PreferredStockSharesAuthorized_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Preferred Stock, Shares Authorized</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_DerivativeWeightedAverageInterestRateReceived_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Weighted-Average Interest Rate Received</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_DerivativeWeightedAverageInterestRateReceived_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Derivative Weighted Average Interest Rate Received</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_DerivativeWeightedAverageInterestRateReceived_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Derivative weighted-average interest rate received.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Held to Maturity, fair value, due after ten years</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_NonsufficientFundsFees_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Nonsufficient funds (NSF) fees</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_NonsufficientFundsFees_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Nonsufficient Funds Fees</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_NonsufficientFundsFees_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Amount of nonsufficient funds fees.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_UnrealizedGainOnConversionOfStock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Unrealized gain on conversion of stock</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_UnrealizedGainOnConversionOfStock_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Unrealized gain on conversion of stock.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParentAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParentAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Other comprehensive income, before tax:</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedTotalLabel">Available for Sale, Unrealized Losses, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AllowanceForLoanAndLeaseLossesPeriodIncreaseDecrease_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Increase in allowance for credit losses for loans</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AllowanceForLoanAndLeaseLossesPeriodIncreaseDecrease_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Increase in allowance for credit losses for loans</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AllowanceForLoanAndLeaseLossesPeriodIncreaseDecrease_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Allowance for Loan and Lease Losses, Period Increase (Decrease)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_UnderlyingAssetClassAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Underlying Asset Class</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_UnderlyingAssetClassAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Underlying Asset Class [Axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InterestBearingDepositLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Interest-Bearing Deposit Liabilities, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InterestBearingDepositLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Interest-bearing</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InterestBearingDepositLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Interest-Bearing Deposit Liabilities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDate_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Available for Sale, fair value, subtotal</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDate_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Fair Value</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccountsNotesAndLoansReceivableLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Accounts Notes And Loans Receivable [Line Items]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccountsNotesAndLoansReceivableLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Accounts, Notes, Loans and Financing Receivable [Line Items]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Business Combination [Table]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityRegistrantName_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Entity Registrant Name</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityRegistrantName_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Entity Registrant Name</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Available for Sale, Gross Unrealized Losses</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Finite-Lived Intangible Asset, Expected Amortization, Year Two</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">2028</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ConversionOfStockSharesIssued1_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Number of shares sold</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ConversionOfStockSharesIssued1_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Conversion of Stock, Shares Issued</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_PaycheckProtectionProgramMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Paycheck Protection Program [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_PaycheckProtectionProgramMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Paycheck Protection Program [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_PaycheckProtectionProgramMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Paycheck protection program.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Finite-Lived Intangible Asset, Expected Amortization, Year Three</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">2029</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeTaxExpenseBenefit_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Income Tax Expense (Benefit), Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeTaxExpenseBenefit_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">PROVISION FOR INCOME TAXES</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeTaxExpenseBenefit_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Income Tax Expense (Benefit)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OffBalanceSheetCreditLossLiability_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel">Allowance for credit losses on off-balance sheet credit exposures, Ending Balance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OffBalanceSheetCreditLossLiability_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel">Allowance for credit losses on off-balance sheet credit exposures, Beginning Balance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OffBalanceSheetCreditLossLiability_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Allowance for credit losses on off-balance sheet credit exposures</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OffBalanceSheetCreditLossLiability_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Off-Balance-Sheet, Credit Loss, Liability</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueByMeasurementFrequencyAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Measurement Frequency</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueByMeasurementFrequencyAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Measurement Frequency [Axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockDividendsPerShareCashPaid_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Cash dividend declared, per share (in dollars per share)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockDividendsPerShareCashPaid_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Common Stock, Dividends, Per Share, Cash Paid</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_CertainLoanAcquiredInTransferNotAccountedForAsDebtSecuritiesOutstandingBalance_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Outstanding balance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_CertainLoanAcquiredInTransferNotAccountedForAsDebtSecuritiesOutstandingBalance_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Certain Loan Acquired in Transfer Not Accounted for as Debt Securities Outstanding Balance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_CertainLoanAcquiredInTransferNotAccountedForAsDebtSecuritiesOutstandingBalance_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Certain loan acquired in transfer not accounted for as debt securities outstanding balance.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetChangeNoninterestBearingDepositsDomestic_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Net Change Noninterest-Bearing Deposits, Domestic</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetChangeNoninterestBearingDepositsDomestic_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Net increase (decrease) in noninterest-bearing deposits</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Share Based Compensation Arrangement By Share Based Payment Award [Line Items]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ProceedsFromLifeInsurancePolicies_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Proceeds from insurance claims</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ProceedsFromLifeInsurancePolicies_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Proceeds from Life Insurance Policy</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_MunicipalSecuritiesPercentageOfSecuritiesPortfolio_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Municipal securities percentage of securities portfolio</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_MunicipalSecuritiesPercentageOfSecuritiesPortfolio_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Municipal Securities Percentage Of Securities Portfolio</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_MunicipalSecuritiesPercentageOfSecuritiesPortfolio_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Municipal securities percentage of securities portfolio.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_DerivativeWeightedAverageInterestRatePaid_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Weighted-Average Interest Rate Paid</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_DerivativeWeightedAverageInterestRatePaid_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Derivative Weighted Average Interest Rate Paid</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_DerivativeWeightedAverageInterestRatePaid_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Derivative weighted-average interest rate paid.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityCommonStockSharesOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Entity Common Stock, Shares Outstanding (in shares)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityCommonStockSharesOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Entity Common Stock, Shares Outstanding</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InterestRateLockCommitmentsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Interest Rate Lock Commitments [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InterestRateLockCommitmentsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Interest Rate Lock Commitments [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_USStatesAndPoliticalSubdivisionsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">States and Political Subdivisions [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_USStatesAndPoliticalSubdivisionsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">US States and Political Subdivisions Debt Securities [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LesseeOperatingLeaseRemainingLeaseTerm_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Lessee operating lease remaining lease term</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LesseeOperatingLeaseRemainingLeaseTerm_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Lessee, Operating Lease, Remaining Lease Term</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Payments to Acquire Property, Plant, and Equipment, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Purchase of bank premises and equipment</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Payments to Acquire Property, Plant, and Equipment</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_GainLossOnInvestments_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Gain (Loss) on Investments</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_GainLossOnInvestments_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Gain (Loss) on Investments, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_GainLossOnInvestments_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Net gain on sale of investment securities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_FinancialInstitutionCounterpartyMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Financial Institution Counterparty [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_FinancialInstitutionCounterpartyMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Financial Institution Counterparty [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_FinancialInstitutionCounterpartyMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Financial institution counterparty.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_Assets_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Assets</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_Assets_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">TOTAL ASSETS</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_Assets_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Assets</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_Assets_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Total assets</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Class of Financing Receivable</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Class of Financing Receivable [Domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeStatementAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Income Statement [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherRealEstateAndForeclosedAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Other Real Estate, Foreclosed Assets, and Repossessed Assets</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherRealEstateAndForeclosedAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total nonperforming assets</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_GainLossOnSalesOfLoansNet_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Gain (Loss) on Sales of Loans, Net, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_GainLossOnSalesOfLoansNet_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Net gain on sale of loans</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_GainLossOnSalesOfLoansNet_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Gain (Loss) on Sales of Loans, Net</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_DebitCardDataProcessingAndSoftwareAmortization_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Credit and debit card, data processing and software amortization</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_DebitCardDataProcessingAndSoftwareAmortization_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Debit Card Data Processing And Software Amortization</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_DebitCardDataProcessingAndSoftwareAmortization_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Debit card data processing and software amortization.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessCombinationsAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Business Combination [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EarningsPerShareDiluted_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Earnings Per Share, Diluted, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EarningsPerShareDiluted_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Earnings Per Share, Diluted</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EarningsPerShareDiluted_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Per Share Amount, Diluted</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Nonaccrual loans</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Financing Receivable, Nonaccrual</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_FundedAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Funded amount</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_FundedAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Funded Amount</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_FundedAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Funded amount.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Available for Sale, fair value, mortgage-backed securities and collateralized mortgage obligations</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Debt Securities, Available-for-Sale, Maturity, without Single Maturity Date, Fair Value</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_UnrealizedGainOnStockExchange_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Unrealized gain on stock exchange</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_UnrealizedGainOnStockExchange_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Unrealized gain on stock exchange.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_CityAreaCode_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">City Area Code</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_CityAreaCode_lbl" xlink:role="http://www.xbrl.org/2003/role/label">City Area Code</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_PercentageOfLoanPortfolioWhichUsedLondonInterbankOfferedRateIndex_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Percentage of loan portfolio which used LIBOR as an index rate</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_PercentageOfLoanPortfolioWhichUsedLondonInterbankOfferedRateIndex_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Percentage Of Loan Portfolio Which Used London Interbank Offered Rate Index</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_PercentageOfLoanPortfolioWhichUsedLondonInterbankOfferedRateIndex_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Percentage of loan portfolio which used London Interbank Offered Rate index.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionsAccumulatedLoss_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedTotalLabel">Held to Maturity, Unrealized Losses, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionsAccumulatedLoss_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Held to Maturity Securities Continuous Unrealized Loss Positions Accumulated Loss, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionsAccumulatedLoss_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Held to Maturity, Unrealized Losses, Totals</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionsAccumulatedLoss_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Held to Maturity Securities Continuous Unrealized Loss Positions Accumulated Loss</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionsAccumulatedLoss_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Held to maturity securities continuous unrealized loss positions accumulated loss.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentTax_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Accumulated Other Comprehensive Income Loss Available For Sale Securities Adjustment Tax</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentTax_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">The tax effect from accumulated appreciation or loss, in value of the total of unsold securities at the end of an accounting period.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentTax_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Accumulated other comprehensive income (loss) net unrealized loss on available for sale securities, net of tax (expense) benefit</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_Deposits_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Total deposits</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_Deposits_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total deposits</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_Deposits_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Deposits</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_LoansAndLeasesReceivableNetOfDeferredIncomeAndLoanReceivableCurrentPeriodGrossWriteoffsFiveOrMoreYearsBeforeLatestFiscalYear_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Current-period gross write-offs, Prior</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_LoansAndLeasesReceivableNetOfDeferredIncomeAndLoanReceivableCurrentPeriodGrossWriteoffsFiveOrMoreYearsBeforeLatestFiscalYear_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Loans And Leases Receivable Net Of Deferred Income And Loan Receivable Current Period Gross Writeoffs Five Or More Years Before Latest Fiscal Year</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_LoansAndLeasesReceivableNetOfDeferredIncomeAndLoanReceivableCurrentPeriodGrossWriteoffsFiveOrMoreYearsBeforeLatestFiscalYear_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Loans and leases receivable net of deferred income and loan receivable current period gross writeoffs five or more years before latest fiscal year.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfIntangibleAssetsAndGoodwillTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Goodwill and Core Deposit Intangibles</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfIntangibleAssetsAndGoodwillTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Schedule of Intangible Assets and Goodwill [Table Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinancialAssetPastDueMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Financing Receivables Past Due Loans [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinancialAssetPastDueMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Financial Asset, Past Due [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessAcquisitionLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Business Combination [Line Items]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessAcquisitionLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Business Acquisition [Line Items]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentBeforeTaxPortionAttributableToParentAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Securities available for sale:</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentBeforeTaxPortionAttributableToParentAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Other Comprehensive Income (Loss), Available-for-Sale Securities Adjustment, before Tax, Portion Attributable to Parent [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InterestAndFeeIncomeLoansAndLeases_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Interest and Fee Income, Loans and Leases, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InterestAndFeeIncomeLoansAndLeases_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Loans, including fees</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InterestAndFeeIncomeLoansAndLeases_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Interest and Fee Income, Loans and Leases</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommercialAndIndustrialSectorMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Commercial and Industrial [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommercialAndIndustrialSectorMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Commercial and Industrial Sector [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_GuaranteeObligationsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Guarantee Obligations [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_GuaranteeObligationsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Guarantee Obligations [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_RepurchaseAgreementCounterpartyNameDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Counterparty Name</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_RepurchaseAgreementCounterpartyNameDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Counterparty Name [Domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_AmericanMergerMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">American Merger [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_AmericanMergerMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">American Merger.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_HoustonTexasMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Houston, Texas [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_HoustonTexasMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Houston Texas.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_HoustonTexasMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Houston Texas [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_FamilyResidential14IncludesHomeEquityMember_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">1-4 Family Residential (Includes Home Equity) [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_FamilyResidential14IncludesHomeEquityMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">1-4 Family [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_FamilyResidential14IncludesHomeEquityMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Family Residential14 Includes Home Equity [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_FamilyResidential14IncludesHomeEquityMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Related to 1-4 family residential portfolio segment that includes home equity.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LoansHeldForSaleFairValueDisclosure_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Loans held for investment, net of allowance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LoansHeldForSaleFairValueDisclosure_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Loan, Held-for-Sale, Fair Value Disclosure</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total other comprehensive income</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Total other comprehensive income, before tax amount</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Operating lease, weighted average remaining lease term</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Operating Lease, Weighted Average Remaining Lease Term</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DerivativeFairValueOfDerivativeLiability_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Derivative financial instruments, liabilities at fair value</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DerivativeFairValueOfDerivativeLiability_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Derivative Liability, Subject to Master Netting Arrangement, before Offset</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_FarmlandMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Farmland [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_FarmlandMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Farmland [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_FarmlandMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Related to the farmland portfolio segment.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PropertyPlantAndEquipmentNet_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Property, Plant and Equipment, Net, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PropertyPlantAndEquipmentNet_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Bank premises and equipment, net</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PropertyPlantAndEquipmentNet_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Property, Plant and Equipment, Net</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Common stock issued in connection with the issuance (forfeiture) of restricted stock awards, net</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Common stock issued (forfeited) in connection with the granting of restricted stock awards, net</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Including Disposal Group and Discontinued Operations, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel">CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel">CASH AND CASH EQUIVALENTS, END OF PERIOD</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Including Discontinued Operation</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_BankTermFundingProgramMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Bank Term Funding Program [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_BankTermFundingProgramMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Bank Term Funding Program [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_BankTermFundingProgramMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Bank term funding program.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RetainedEarningsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Retained Earnings [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RetainedEarningsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Retained Earnings [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonClassCMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Common Class C [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensation_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Share-Based Payment Arrangement, Noncash Expense, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensation_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Stock based compensation expense</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensation_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Payment Arrangement, Noncash Expense</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FederalFundsSold_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Federal funds sold</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FederalFundsSold_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Federal Funds Sold</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NoninterestIncomeOtherOperatingIncome_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Other</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NoninterestIncomeOtherOperatingIncome_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Noninterest Income, Other Operating Income</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Available for Sale, Estimated Fair Value, Less than 12 Months</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Operating lease, weighted average discount rate, percent</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Operating Lease, Weighted Average Discount Rate, Percent</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueInputsLevel1Member_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Level 1 [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueInputsLevel1Member_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Fair Value, Inputs, Level 1 [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetCashProvidedByUsedInFinancingActivities_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cash Provided by (Used in) Financing Activity, Including Discontinued Operation</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetCashProvidedByUsedInFinancingActivities_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Net cash used in financing activities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinancingReceivableOriginatedThreeYearsBeforeLatestFiscalYear_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinancingReceivableOriginatedThreeYearsBeforeLatestFiscalYear_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">2023</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Available for Sale, fair value, due after five years through ten years</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_MarketableSecuritiesTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Schedule of Amortized Cost and Fair Value of Investment Securities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_MarketableSecuritiesTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Marketable Securities [Table Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DerivativeContractTypeDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Derivative Contract</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DerivativeContractTypeDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Derivative Contract [Domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax_lbl" xlink:role="http://www.xbrl.org/2003/role/label">AOCI, Debt Securities, Available-for-Sale, Adjustment, after Tax</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel">Ending balance, accumulated other comprehensive income (loss)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel">Beginning balance, accumulated other comprehensive income (loss)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Accumulated other comprehensive income (loss) - net unrealized loss on available for sale securities, net of tax (expense) benefit of $9 and $(79), respectively</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CorporateDebtSecuritiesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Corporate Debt Securities [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CorporateDebtSecuritiesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Corporate Debt Securities [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityInteractiveDataCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Entity Interactive Data Current</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityInteractiveDataCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Entity Interactive Data Current</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_SubstandardAndImpairedMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Grade 7 [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_SubstandardAndImpairedMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Substandard And Impaired [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_SubstandardAndImpairedMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Substandard and impaired</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueDisclosureItemAmountsDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Fair Value Measurement</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueDisclosureItemAmountsDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Fair Value Measurement [Domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">CASH FLOWS FROM OPERATING ACTIVITIES:</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LoanRestructuringModificationDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Loan Restructuring Modification</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LoanRestructuringModificationDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Loan Restructuring Modification [Domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NewAccountingPronouncementsAndChangesInAccountingPrinciplesTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">New Accounting Standards</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NewAccountingPronouncementsAndChangesInAccountingPrinciplesTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Accounting Standards Update and Change in Accounting Principle [Text Block]</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Business acquisition, equity interest issued or issuable, number of shares</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Business acquisition, number of shares</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Business Combination, Consideration Transferred, Equity Interest, Share Issued, Number of Shares</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_ConstructionLandDevelopmentAndOtherLandLoansMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Construction, Land Development and Other Land Loans [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_ConstructionLandDevelopmentAndOtherLandLoansMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Construction Land Development And Other Land Loans [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_ConstructionLandDevelopmentAndOtherLandLoansMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Related to the construction, land development, and other land loans.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFour_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Thereafter</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFour_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Finite lived intangible assets amortization expense after year four .</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityTaxIdentificationNumber_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Entity Tax Identification Number</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ForeclosedAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Repossessed assets</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Basis of Presentation</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OccupancyNet_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Net occupancy and equipment</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OccupancyNet_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Occupancy, Net</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PaymentsToAcquireLoansReceivable_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Originations of Warehouse Purchase Program loans</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PaymentsToAcquireLoansReceivable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Payments to Acquire Loans Receivable</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_LocalPhoneNumber_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Local Phone Number</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_LocalPhoneNumber_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Local Phone Number</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtSecuritiesRealizedGainLoss_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Gain (loss) on sale of investment securities</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_ProceedsFromRepaymentsOfShortTermDebtExcludingSecuritiesSoldUnderRepurchaseAgreements_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Proceeds From Repayments Of Short Term Debt Excluding Securities Sold Under Repurchase Agreements</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_ProceedsFromRepaymentsOfShortTermDebtExcludingSecuritiesSoldUnderRepurchaseAgreements_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Proceeds from repayments of short term debt excluding securities sold under repurchase agreements.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_ProceedsFromRepaymentsOfShortTermDebtExcludingSecuritiesSoldUnderRepurchaseAgreements_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Net proceeds (repayments) from other short-term borrowings</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldRecoveriesChargeOffs_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Certain loans acquired in transfer not accounted for as debt securities, accretable yield, recoveries (charge-offs).</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldRecoveriesChargeOffs_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Accretion recoveries (charge-offs)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NoninterestExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total noninterest expense</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Lessee, Operating Lease, Liability, to be Paid, Year Four</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">2030</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ClassOfStockDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Class of Stock [Domain]</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LaborAndRelatedExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Labor and Related Expense</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Weighted-average period of cost expected to be recognized</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_ContractualObligationsAndOffBalanceSheetItemsTable_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Contractual Obligations And Off Balance Sheet Items [Table]</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_ContractualObligationsAndOffBalanceSheetItemsTable_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Contractual obligations and off balance sheet items.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ContractualObligationDueInNextTwelveMonths_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">1 year or less</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityEmergingGrowthCompany_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Entity Emerging Growth Company</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityEmergingGrowthCompany_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Entity Emerging Growth Company</link:label>
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          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="pb_GainLossOnSaleOfOtherRealEstateAndRepossessedAssets" xlink:to="pb_GainLossOnSaleOfOtherRealEstateAndRepossessedAssets_lbl"/>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FinancingReceivableOriginatedTwoYearsBeforeLatestFiscalYear" xlink:to="us-gaap_FinancingReceivableOriginatedTwoYearsBeforeLatestFiscalYear_lbl"/>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityIncorporationStateCountryCode" xlink:to="dei_EntityIncorporationStateCountryCode_lbl"/>
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  <xsd:element id="pb_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionsFairValue" name="HeldToMaturitySecuritiesContinuousUnrealizedLossPositionsFairValue" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit"/>
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  <xsd:element id="pb_AmericanBankHoldingCorporationMember" name="AmericanBankHoldingCorporationMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="pb_FinancingReceivableAllowanceForCreditLossInitialAllowanceOnPurchasedSeasonedLoans" name="FinancingReceivableAllowanceForCreditLossInitialAllowanceOnPurchasedSeasonedLoans" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
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  <xsd:element id="pb_PaycheckProtectionProgramMember" name="PaycheckProtectionProgramMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="pb_AllowanceForLoansAndLeaseLossesWriteOffsNetIncreaseDecrease" name="AllowanceForLoansAndLeaseLossesWriteOffsNetIncreaseDecrease" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
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  <xsd:element id="pb_CARESActMember" name="CARESActMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
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  <xsd:element id="pb_DerivativeWeightedAverageInterestRatePaid" name="DerivativeWeightedAverageInterestRatePaid" type="xbrli:pureItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false"/>
  <xsd:element id="pb_WestNorthAndCentralTexasMember" name="WestNorthAndCentralTexasMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="pb_MinimumPercentageOfIncomeTaxPaymentNetOfRefundsReceived" name="MinimumPercentageOfIncomeTaxPaymentNetOfRefundsReceived" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false"/>
  <xsd:element id="pb_UnrealizedGainOnStockExchange" name="UnrealizedGainOnStockExchange" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
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  <xsd:element id="pb_BankTermFundingProgramMember" name="BankTermFundingProgramMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="pb_LoanCustomerCounterpartyMember" name="LoanCustomerCounterpartyMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="pb_ChangesInAccretableYieldForPciAndNonPciLoansLineItems" name="ChangesInAccretableYieldForPciAndNonPciLoansLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="pb_AllowanceForLoansAndLeaseLossesWriteoffsNet" name="AllowanceForLoansAndLeaseLossesWriteoffsNet" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="pb_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionsLessThanTwelveMonthsFairValue" name="HeldToMaturitySecuritiesContinuousUnrealizedLossPositionsLessThanTwelveMonthsFairValue" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="pb_LoansAndLeasesReceivableNetOfDeferredIncomeAndLoanReceivableCurrentPeriodGrossWriteoffsThreeYearsBeforeLatestFiscalYear" name="LoansAndLeasesReceivableNetOfDeferredIncomeAndLoanReceivableCurrentPeriodGrossWriteoffsThreeYearsBeforeLatestFiscalYear" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
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  <xsd:element id="pb_TroubledDebtRestructuringMember" name="TroubledDebtRestructuringMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
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  <xsd:element id="pb_NumberOfStockBasedEmployeeCompensationPlans" name="NumberOfStockBasedEmployeeCompensationPlans" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false"/>
  <xsd:element id="pb_NumberOfBankingOffices" name="NumberOfBankingOffices" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="pb_ResidentialMortgageLoansMember" name="ResidentialMortgageLoansMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="pb_LoansAndLeaseReceivableNetReportedAmount" name="LoansAndLeaseReceivableNetReportedAmount" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="pb_NoninterestIncomeTrust" name="NoninterestIncomeTrust" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="pb_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldRecoveriesChargeOffs" name="CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldRecoveriesChargeOffs" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="pb_LoansAndLeasesReceivableNetOfDeferredIncomeAndLoanReceivableHeldForSaleAmount" name="LoansAndLeasesReceivableNetOfDeferredIncomeAndLoanReceivableHeldForSaleAmount" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="pb_ClassB2CommonStockMember" name="ClassB2CommonStockMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="pb_LoansAndLeasesReceivableNetOfDeferredIncomeAndLoanReceivableCurrentPeriodGrossWriteoffs" name="LoansAndLeasesReceivableNetOfDeferredIncomeAndLoanReceivableCurrentPeriodGrossWriteoffs" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="pb_LoneStarMergerMember" name="LoneStarMergerMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="pb_CertainLoanAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldAccretion" name="CertainLoanAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldAccretion" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="pb_LoansAndLeasesReceivableNetOfDeferredIncomeAndLoanReceivableCurrentPeriodGrossWriteoffsBeforeLatestFiscalYear" name="LoansAndLeasesReceivableNetOfDeferredIncomeAndLoanReceivableCurrentPeriodGrossWriteoffsBeforeLatestFiscalYear" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="pb_FinancialEffectOnModificationsMaidOnLoan" name="FinancialEffectOnModificationsMaidOnLoan" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="pb_DebitCardDataProcessingAndSoftwareAmortization" name="DebitCardDataProcessingAndSoftwareAmortization" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="pb_NonPerformingAssetsToLoansAndOtherRealEstate" name="NonPerformingAssetsToLoansAndOtherRealEstate" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false"/>
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  <xsd:element id="pb_CertainLoanAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldAdditions" name="CertainLoanAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldAdditions" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
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  <xsd:element id="pb_FamilyResidential14IncludesHomeEquityMember" name="FamilyResidential14IncludesHomeEquityMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="pb_FinancingReceivableNonAccrualStatusMember" name="FinancingReceivableNonAccrualStatusMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="pb_AllowanceForLoanAndLeaseLossesGeneralReserves" name="AllowanceForLoanAndLeaseLossesGeneralReserves" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
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  <xsd:element id="pb_FinancingReceivableAmortizedCostOfLoansExperiencingFinancialDifficultyAndModifiedTableTextBlock" name="FinancingReceivableAmortizedCostOfLoansExperiencingFinancialDifficultyAndModifiedTableTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="pb_LoansAndLeasesReceivableNetOfDeferredIncomeRelatedToWarehousePurchaseProgram" name="LoansAndLeasesReceivableNetOfDeferredIncomeRelatedToWarehousePurchaseProgram" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="pb_OtherThanUSGovernmentAndAgenciesMember" name="OtherThanUSGovernmentAndAgenciesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="pb_AllowanceOnPCDLoansAtAcquisition" name="AllowanceOnPCDLoansAtAcquisition" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="pb_GainLossOnSaleOfOtherRealEstateAndRepossessedAssets" name="GainLossOnSaleOfOtherRealEstateAndRepossessedAssets" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="pb_PurchaseConsiderationCashPayablePerShare" name="PurchaseConsiderationCashPayablePerShare" type="dtr-types:perShareItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="pb_WarehousePurchaseProgramLoansMember" name="WarehousePurchaseProgramLoansMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="pb_StockIncentive2020PlanMember" name="StockIncentive2020PlanMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="pb_AllowanceForLoanAndLeaseLossRecoveryWriteoffs" name="AllowanceForLoanAndLeaseLossRecoveryWriteoffs" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
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  <xsd:element id="pb_LoansAndAllowanceForCreditLossesTextBlock" name="LoansAndAllowanceForCreditLossesTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="pb_UnrealizedGainOnConversionOfStock" name="UnrealizedGainOnConversionOfStock" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="pb_FinancingReceivableRevolvingConvertedToTermLoans" name="FinancingReceivableRevolvingConvertedToTermLoans" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="pb_CertainLoanAcquiredInTransferNotAccountedForAsDebtSecuritiesOutstandingBalance" name="CertainLoanAcquiredInTransferNotAccountedForAsDebtSecuritiesOutstandingBalance" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="pb_FinancialAssetAcquiredWithSeasonedLoansMember" name="FinancialAssetAcquiredWithSeasonedLoansMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="pb_NonsufficientFundsFees" name="NonsufficientFundsFees" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="pb_ScheduleOfIntangibleAssetsAndGoodwillTable" name="ScheduleOfIntangibleAssetsAndGoodwillTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="pb_NoninterestIncomeCreditCardDebitCardAndATMCard" name="NoninterestIncomeCreditCardDebitCardAndATMCard" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="pb_SouthAndCentralTexasMember" name="SouthAndCentralTexasMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="pb_PercentageOfLoanPortfolioWhichUsedLondonInterbankOfferedRateIndex" name="PercentageOfLoanPortfolioWhichUsedLondonInterbankOfferedRateIndex" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false"/>
  <xsd:element id="pb_ConsumerAndOtherMember" name="ConsumerAndOtherMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="pb_LoansAndLeasesReceivableNetOfDeferredIncomeAndLoanReceivableCurrentPeriodGrossWriteOffsRevolvingLoansConvertedToTermLoans" name="LoansAndLeasesReceivableNetOfDeferredIncomeAndLoanReceivableCurrentPeriodGrossWriteOffsRevolvingLoansConvertedToTermLoans" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="pb_ImpairedLoansOutstanding" name="ImpairedLoansOutstanding" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="pb_AllowanceForLoansAndLeaseLossesWriteoffs" name="AllowanceForLoansAndLeaseLossesWriteoffs" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="pb_ChangesInAccretableYieldForPciAndNonPciLoansTable" name="ChangesInAccretableYieldForPciAndNonPciLoansTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="pb_ForeclosedRealEstateExpenseAndRevenue" name="ForeclosedRealEstateExpenseAndRevenue" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="pb_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionsLessThan12MonthsAccumulatedLoss" name="HeldToMaturitySecuritiesContinuousUnrealizedLossPositionsLessThan12MonthsAccumulatedLoss" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="pb_LoansAndLeaseReceivableImpairedNonperformingNonaccrualOfInterest" name="LoansAndLeaseReceivableImpairedNonperformingNonaccrualOfInterest" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="pb_NetAccretionOfDiscountOnLoans" name="NetAccretionOfDiscountOnLoans" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="pb_CommercialRealEstateIncludesMultifamilyResidentialMember" name="CommercialRealEstateIncludesMultifamilyResidentialMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="pb_NonperformingAssetsToLoansExcludingWarehousePurchaseProgramLoansAndOtherRealEstate" name="NonperformingAssetsToLoansExcludingWarehousePurchaseProgramLoansAndOtherRealEstate" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false"/>
  <xsd:element id="pb_PercentageOfRealEstateLoansAggregatingToCompanyLoanPortfolioExcludingWarehousePurchaseProgramLoans" name="PercentageOfRealEstateLoansAggregatingToCompanyLoanPortfolioExcludingWarehousePurchaseProgramLoans" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false"/>
  <xsd:element id="pb_ContractualObligationsAndOffBalanceSheetItemsLineItems" name="ContractualObligationsAndOffBalanceSheetItemsLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="pb_InterestRateSwapsAndLoansReceivableDescriptionOfIndexRateBasis" name="InterestRateSwapsAndLoansReceivableDescriptionOfIndexRateBasis" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="pb_LoansAndLeasesReceivableNetOfDeferredIncomeAndLoanReceivableCurrentPeriodGrossWriteoffsCurrentFiscalYear" name="LoansAndLeasesReceivableNetOfDeferredIncomeAndLoanReceivableCurrentPeriodGrossWriteoffsCurrentFiscalYear" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="pb_NetIncreaseDecreaseInSecuritiesSoldUnderRepurchaseAgreements" name="NetIncreaseDecreaseInSecuritiesSoldUnderRepurchaseAgreements" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="pb_RegulatoryAssessmentsAndFdicInsurance" name="RegulatoryAssessmentsAndFdicInsurance" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="pb_CommercialRealEstateLoanMember" name="CommercialRealEstateLoanMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="pb_IncreaseDecreaseInAllowanceForCreditLossesPercent" name="IncreaseDecreaseInAllowanceForCreditLossesPercent" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="pb_ForwardMortgageBackedSecuritiesTradesMember" name="ForwardMortgageBackedSecuritiesTradesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="pb_InterestIncomeFederalFundsSoldAndOtherEarningAssets" name="InterestIncomeFederalFundsSoldAndOtherEarningAssets" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="pb_ConstructionLandDevelopmentAndOtherLandLoansMember" name="ConstructionLandDevelopmentAndOtherLandLoansMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="pb_Grade4Member" name="Grade4Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="pb_AllowanceForLoansAndLeaseLossesPeriodIncreaseDecrease" name="AllowanceForLoansAndLeaseLossesPeriodIncreaseDecrease" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="pb_SubstandardAndImpairedMember" name="SubstandardAndImpairedMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="pb_NumberOfLoanProductionOffices" name="NumberOfLoanProductionOffices" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false"/>
  <xsd:element id="pb_FirstBancsharesOfTexasIncMember" name="FirstBancsharesOfTexasIncMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="pb_NonperformingFinancingReceivableAssetsMember" name="NonperformingFinancingReceivableAssetsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="pb_ScheduleOfNonperformingAssetsTableTextBlock" name="ScheduleOfNonperformingAssetsTableTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="pb_FinancialEffectOnModificationsMaidOnLoanDueToTermExtension" name="FinancialEffectOnModificationsMaidOnLoanDueToTermExtension" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="pb_FinancingReceivableRatioOfNonperformingLoansToAllLoansAndOtherRealEstate" name="FinancingReceivableRatioOfNonperformingLoansToAllLoansAndOtherRealEstate" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false"/>
  <xsd:element id="pb_NedHolmesMember" name="NedHolmesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="pb_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentTax" name="AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentTax" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="pb_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLossesLoanModificationsAmortizedCost" name="FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLossesLoanModificationsAmortizedCost" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="pb_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionsTwelveMonthsOrLongerFairValue" name="HeldToMaturitySecuritiesContinuousUnrealizedLossPositionsTwelveMonthsOrLongerFairValue" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="pb_ScheduleOfUnrealizedLossOnInvestmentTableTextBlock" name="ScheduleOfUnrealizedLossOnInvestmentTableTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="pb_FinancingReceivables30To89DaysPastDueMember" name="FinancingReceivables30To89DaysPastDueMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="pb_ProvisionForCreditLosses" name="ProvisionForCreditLosses" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="pb_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFour" name="FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFour" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="pb_LoansAndLeasesReceivableNetOfDeferredIncomeAndLoanReceivableCurrentPeriodGrossWriteoffsFiveOrMoreYearsBeforeLatestFiscalYear" name="LoansAndLeasesReceivableNetOfDeferredIncomeAndLoanReceivableCurrentPeriodGrossWriteoffsFiveOrMoreYearsBeforeLatestFiscalYear" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="pb_ProvisionForLoansAndLeaseLosses" name="ProvisionForLoansAndLeaseLosses" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="pb_RealEstateOwnedOutstanding" name="RealEstateOwnedOutstanding" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="pb_FarmlandMember" name="FarmlandMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="pb_CommitmentsExpectedToFund" name="CommitmentsExpectedToFund" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="pb_DebtSecuritiesHeldToMaturityCreditLoss" name="DebtSecuritiesHeldToMaturityCreditLoss" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="pb_PercentageOfLoansRelatedToSingleIndustryOnLoans" name="PercentageOfLoansRelatedToSingleIndustryOnLoans" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false"/>
  <xsd:element id="pb_NoninterestIncomeMortgage" name="NoninterestIncomeMortgage" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="pb_LoanModificationsMadeToBorrowersExperiencingFinancialDifficultyPercentage" name="LoanModificationsMadeToBorrowersExperiencingFinancialDifficultyPercentage" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="pb_FinancialEffectOnModificationsMaidOnLoanDueToInterestRateReduction" name="FinancialEffectOnModificationsMaidOnLoanDueToInterestRateReduction" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="pb_SubordinatedNotesAndJuniorSubordinatedDebentures" name="SubordinatedNotesAndJuniorSubordinatedDebentures" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="pb_FinancingReceivableLoanModificationsFinancialEffectTableTextBlock" name="FinancingReceivableLoanModificationsFinancialEffectTableTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="pb_NumberOfInvestmentSecuritiesSegments" name="NumberOfInvestmentSecuritiesSegments" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="pb_InterestExpenseSubordinatedNotesAndJuniorSubordinatedDebentures" name="InterestExpenseSubordinatedNotesAndJuniorSubordinatedDebentures" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="pb_UnvestedRestrictedStockMember" name="UnvestedRestrictedStockMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="pb_SecuritiesConcentrationRiskMember" name="SecuritiesConcentrationRiskMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="pb_VisaStockExchangeMember" name="VisaStockExchangeMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="pb_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesDiscount" name="CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesDiscount" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="pb_Grade3Member" name="Grade3Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="pb_ContractualObligationsAndOffBalanceSheetItemsTable" name="ContractualObligationsAndOffBalanceSheetItemsTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="pb_PurchasedAndNonPurchasedCreditImpairedLoansLineItems" name="PurchasedAndNonPurchasedCreditImpairedLoansLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="pb_ProceedsFromRepaymentsOfShortTermDebtExcludingSecuritiesSoldUnderRepurchaseAgreements" name="ProceedsFromRepaymentsOfShortTermDebtExcludingSecuritiesSoldUnderRepurchaseAgreements" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="pb_LoansAndLeasesReceivableNetOfDeferredIncomeAndLoanReceivableCurrentPeriodGrossWriteoffsRevolvingLoans" name="LoansAndLeasesReceivableNetOfDeferredIncomeAndLoanReceivableCurrentPeriodGrossWriteoffsRevolvingLoans" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="pb_SubstandardAndNonImpairedMember" name="SubstandardAndNonImpairedMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="pb_CertainLoanAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet" name="CertainLoanAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="pb_AgricultureAndAgricultureRealEstateIncludesFarmlandMember" name="AgricultureAndAgricultureRealEstateIncludesFarmlandMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="pb_RecordedInvestmentAndOutstandingBalanceForPurchasedCreditDeterioratedLoansAndNonPurchasedCreditDeterioratedLoansTextBlock" name="RecordedInvestmentAndOutstandingBalanceForPurchasedCreditDeterioratedLoansAndNonPurchasedCreditDeterioratedLoansTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="pb_LesseeOperatingLeaseLiabilityUndiscountedLeasePayments" name="LesseeOperatingLeaseLiabilityUndiscountedLeasePayments" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="pb_PercentageOfInterestRateSwapWhichUsedLondonInterbankOfferedRateIndex" name="PercentageOfInterestRateSwapWhichUsedLondonInterbankOfferedRateIndex" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false"/>
  <xsd:element id="pb_StellarBancorpIncMember" name="StellarBancorpIncMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="pb_PurchasedAndNonPurchasedCreditImpairedLoansTable" name="PurchasedAndNonPurchasedCreditImpairedLoansTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="pb_LoanToBeConsideredAsPaymentDefaultInPeriod" name="LoanToBeConsideredAsPaymentDefaultInPeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="pb_FinancialInstitutionCounterpartyMember" name="FinancialInstitutionCounterpartyMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="pb_HoustonTexasMember" name="HoustonTexasMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="pb_FinancingReceivablePayableOriginatedFourYearsBeforeLatestFiscalYear" name="FinancingReceivablePayableOriginatedFourYearsBeforeLatestFiscalYear" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="pb_DerivativeWeightedAverageInterestRateReceived" name="DerivativeWeightedAverageInterestRateReceived" type="xbrli:pureItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false"/>
</xsd:schema>
