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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_FinancingReceivableLoanModificationsFinancialEffectTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Schedule of Loan Modifications</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_FinancingReceivableLoanModificationsFinancialEffectTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Financing Receivable, Loan Modifications, Financial Effect [Table Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_FinancingReceivableLoanModificationsFinancialEffectTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Financing Receivable, Loan Modifications, Financial Effect [Table 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/label">Business Combination Disclosure [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="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">2028</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="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_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_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_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_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_ScheduleOfRecognizedIdentifiedAssetsAcquiredAndLiabilitiesAssumedTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block]</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_FairValueInputsLevel2Member_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Fair Value, Inputs, Level 2 [Member]</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>
          <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_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_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_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_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_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/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/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_OffBalanceSheetCreditLossLiabilityAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Off-Balance-Sheet, Credit Loss, Liability [Abstract]</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/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/terseLabel">Provision for credit losses</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="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="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/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="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_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/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/verboseLabel">Total consideration paid</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="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/terseLabel">Financing Receivables, 30 to 89 Days Past Due [Member]</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="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/terseLabel">Impaired loans outstanding</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 2024</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="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_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_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_CommitmentsAndContingenciesDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Commitments and Contingencies Disclosure [Text Block]</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/terseLabel">Contractual Obligations and Off-Balance Sheet Items</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="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_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_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_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">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/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/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="pb_OutstandingAmoutConsistingOfOneTermAdvance_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Outstanding amout consisting of one-term advance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_OutstandingAmoutConsistingOfOneTermAdvance_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Outstanding Amout Consisting Of One-Term Advance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_OutstandingAmoutConsistingOfOneTermAdvance_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Outstanding amout consisting of one-term advance.</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="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/terseLabel">Credit card, debit card and ATM card income</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PaymentGuaranteeMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Payment Guarantee [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PaymentGuaranteeMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Payment Guarantee [Member]</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="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/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/terseLabel">Net charge-offs</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_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="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="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/terseLabel">West Texas [Member]</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_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="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="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/terseLabel">Schedule Of Intangible Assets And Goodwill [Line Items]</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_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_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="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_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="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="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="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_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/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_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="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_CommonClassCMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Common Class C [Member]</link:label>
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          <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/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/terseLabel">2020</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_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/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/terseLabel">Loans and Leases Receivable, Related Parties</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_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_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_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_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="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_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_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/totalLabel">Other Assets, Total</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_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/terseLabel">Revolving Loans 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/documentation">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/terseLabel">Number of sublease arrangement</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_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_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_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_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="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_HeldToMaturitySecurities_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Held to maturity securities, at cost (fair value of $9,964,060 and $10,984,598, respectively)</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/totalLabel">Held to Maturity, Amortized Cost</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="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="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_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="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/terseLabel">Trust income</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="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="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="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/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/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/2003/role/periodEndLabel">Allowance for credit losses on loans, ending balance</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="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_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_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="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="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/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_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="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/terseLabel">Held to Maturity, Estimated Fair Value, 12 Months or More</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_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_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="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://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_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_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_MarketableSecurities_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Marketable Securities</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>
          <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="srt_MajorCustomersAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Customer</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="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_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">2027</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_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_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="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_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_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="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="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/terseLabel">Regulatory assessments and FDIC insurance</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="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="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="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_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_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">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/totalLabel">Earnings Per Share, Basic, Total</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="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/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_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_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/terseLabel">Number of banking offices</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_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="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="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/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/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="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, 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/verboseLabel">Common stock issued in connection with the acquisition (in shares)</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="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/terseLabel">Commitments expected to fund</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_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/totalLabel">Other Liabilities, Total</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_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/terseLabel">Loan to be Considered as Payment Default in Period</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_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_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="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="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/terseLabel">Forward Mortgage-Backed Securities Trades [Member]</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="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_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="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_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_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="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="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="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/totalLabel">Held to Maturity, Estimated Fair Value, 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/label">Retained Earnings (Accumulated Deficit)</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/totalLabel">Retained Earnings (Accumulated Deficit), Total</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_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/verboseLabel">Subordinated Debentures [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_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_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_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_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="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/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_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_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/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/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/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="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_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/terseLabel">Loans and Allowance for Credit Losses</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="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="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/terseLabel">Amortized Cost</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_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/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_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="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/terseLabel">West, North and Central Texas [Member]</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">Net Cash Provided by (Used in) 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/totalLabel">Net cash provided by operating activities</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_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/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_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="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_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">2023</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_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/totalLabel">Property, Plant and Equipment, Net, Total</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">2028</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="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/terseLabel">Unvested Restricted Stock [Member]</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/label">Net Cash Provided by (Used in) Operating Activities [Abstract]</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>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_GuaranteeObligationsByNatureAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Guarantor Obligations, Nature [Axis]</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="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_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_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="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="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/terseLabel">Mortgage income</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="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_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_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_OperatingLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]</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_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_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="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="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="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/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/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/periodEndLabel">Balance at June 30,</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="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/terseLabel">Held to Maturity, Estimated Fair Value, Less than 12 Months</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_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_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_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_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="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_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_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_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="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/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/periodEndLabel">Financing Receivable, Allowance for Credit Loss, Ending Balance</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="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="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="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="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="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/terseLabel">Nonaccrual loans to total loans, excluding Warehouse Purchase Program loans</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_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/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_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_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/documentation">Loan customer counterparty</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/terseLabel">Loan Customer Counterparty [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/documentation">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/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/terseLabel">Loans and leases receivable, 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_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_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_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="pb_AccountingStandardsUpdatesExtensibleList_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Indicates amendment to accounting standards.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_AccountingStandardsUpdatesExtensibleList_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Accounting Standards Updates Extensible List</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_AccountingStandardsUpdatesExtensibleList_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Accounting Standards Update [Extensible List]</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="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/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="us-gaap_USTreasuryAndGovernmentMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">US Treasury and Government [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_USTreasuryAndGovernmentMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">U.S. Treasury Securities and Obligations of U.S. Government Agencies [Member]</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_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_NewAccountingPronouncementsAndChangesInAccountingPrinciplesTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Accounting Standards Update and Change in Accounting Principle [Text Block]</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="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/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/terseLabel">Current-period gross write-offs, 2024</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">2026</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="dei_AmendmentFlag_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Amendment Flag</link:label>
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          <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_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_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_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_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/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/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_CorporateDebtSecuritiesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Corporate Debt Securities [Member]</link:label>
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          <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="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/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/label">Lone Star State Bancshares Merger [Member]</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>
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          <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>
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          <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_BusinessAcquisitionsProFormaRevenue_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Business Acquisition, Pro Forma Revenue</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessAcquisitionsProFormaRevenue_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Pro forma revenue</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="srt_NameOfMajorCustomerDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Customer</link:label>
          <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_LaborAndRelatedExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Salaries and employee benefits</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_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_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="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="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="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="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">2022</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/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/2009/role/negatedLabel">Net gain on sale or write-up of securities</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_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/totalLabel">Cash and Due from Banks, Total</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_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/terseLabel">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/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="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/terseLabel">Commercial Real Estate (Includes Multi-Family Residential) [Member]</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_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/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_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="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_PreferredStockSharesIssued_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Preferred Stock, Shares Issued</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>
          <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_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_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_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_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="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_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_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/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/label">Held to maturity securities</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>
          <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_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_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_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, Bancshares Merger</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FederalHomeLoanBankAdvancesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Federal Home Loan Bank Advances [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FederalHomeLoanBankAdvancesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Federal Home Loan Bank Advances [Member]</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_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="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_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/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_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="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/terseLabel">Increase in allowance for credit losses for loans, percentage</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_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="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_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/2009/role/negatedLabel">Charge-offs</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_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/terseLabel">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/documentation">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/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/terseLabel">Nonperforming assets to total loans and other real estate</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>
          <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_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/verboseLabel">Loans held for sale</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_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_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_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_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_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/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/periodEndLabel">Common Stock, Shares, Outstanding, Ending Balance</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="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="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_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_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="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_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_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_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Acquired Finite-Lived Intangible Assets, Weighted Average Useful Life</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Acquired finite-lived intangible assets, weighted average useful life</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_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="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/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/terseLabel">Increase in allowance for credit losses for loans</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_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_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="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/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/terseLabel">Current-period gross write-offs, 2022</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="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="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="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_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="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_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued_lbl" xlink:role="http://www.xbrl.org/2003/role/label">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/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_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_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_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="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_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_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_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="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="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="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_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="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="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="pb_NumberOfBankingCenters_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Number of banking centers.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_NumberOfBankingCenters_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Number Of Banking Centers</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_NumberOfBankingCenters_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Number of banking centers</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="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="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="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_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="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_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_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/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/2009/role/negatedLabel">Net cash (used in) provided by the purchase of First Bancshares of Texas, Inc./Lone Star State Bancshares, Inc.</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="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_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_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_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="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_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_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="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="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_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="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/terseLabel">Number of stock-based employee compensation plans</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="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_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/verboseLabel">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="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_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/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="us-gaap_BusinessAcquisitionLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Business Acquisition [Line Items]</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_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="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="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="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="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_EquityAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Equity [Abstract]</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>
          <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="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/terseLabel">LSSB Merger [Member]</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_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_FederalHomeLoanBankAdvancesTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Federal Home Loan Bank, Advances [Table Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FederalHomeLoanBankAdvancesTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Summary of Future Cash Payments Associated with Contractual Obligations Pursuant to Subordinated Debentures, Federal Reserve's Bank Term Funding Program and Federal Home Loan Bank Advances</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_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_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_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_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="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_PledgingPurposeAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Pledging Purpose [Axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PledgingPurposeAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Pledging Purpose</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_PledgedAssetsValueAtPar_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Pledged assets value at par</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_PledgedAssetsValueAtPar_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Pledged Assets Value At Par</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_PledgedAssetsValueAtPar_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Pledged assets value at par.</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="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_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_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/totalLabel">Proceeds from Sale of Productive Assets, Total</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="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/terseLabel">Commercial Loan Interest Rate Swaps and Caps [Member]</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_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_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_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_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_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="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_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/label">Foreclosed Real Estate Expense And Revenue</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="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/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="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_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_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="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_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="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/2003/role/totalLabel">Repayments of Subordinated Debt, Total</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_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_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_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="pb_SubordinatedDebentures_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Subordinated debentures</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_SubordinatedDebentures_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Subordinated debentures</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_SubordinatedDebentures_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Subordinated debentures.</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_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_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/terseLabel">Increase in allowance for credit losses for loans</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_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/terseLabel">Current-period gross write-offs, Total</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/label">Business Acquisition, Pro Forma Information [Table Text Block]</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>
          <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/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/terseLabel">Proceeds from maturities, sales and principal paydowns of held to maturity securities</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_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/totalLabel">Interest-Bearing Deposit Liabilities, Total</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="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="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_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_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_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="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="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/terseLabel">Allowance for Credit Losses as Percentage of Loans</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_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_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_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_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_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">2029</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="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/terseLabel">Commercial Real Estate Loan [Member]</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="dei_DocumentFiscalPeriodFocus_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Document Fiscal Period Focus</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_DocumentFiscalPeriodFocus_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Document Fiscal Period Focus</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_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_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="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_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_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/totalLabel">Payments of Dividends, Total</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_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_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_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_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_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_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_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_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_EstimateOfFairValueFairValueDisclosureMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Estimated Fair Value [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="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/verboseLabel">Mortgage-backed Securities [Member]</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 increase (decrease) in interest-bearing deposits</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_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_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_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_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="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_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/terseLabel">2020 Stock Incentive Plan [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="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/terseLabel">Finance Receivable Nonaccrual Status [Member]</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_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_BusinessAcquisitionSharePrice_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Business Acquisition, Share 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_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_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="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="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/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="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_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_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="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_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="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_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_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="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_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/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_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/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/terseLabel">Current-period gross write-offs, 2023</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">Net Cash Provided by (Used in) Investing Activities [Abstract]</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="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="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/terseLabel">Financial Effect</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_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="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/label">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_CertainLoanAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldReclassificationsToFromNonaccretableDifference_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Certain loan acquired in transfer not accounted for as debt securities accretable yield reclassifications to from nonaccretable difference.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_CertainLoanAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldReclassificationsToFromNonaccretableDifference_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Certain Loan Acquired in Transfer Not Accounted for as Debt Securities Accretable Yield Reclassifications to from Nonaccretable Difference</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_CertainLoanAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldReclassificationsToFromNonaccretableDifference_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Adjustments</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="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_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_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="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/2009/role/negatedLabel">Accretion</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_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/totalLabel">Proceeds from Sale of Loans Held-for-sale, Total</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="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/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_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_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/terseLabel">Real estate owned 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/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="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/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="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="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="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="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/terseLabel">Securities in Continuous Loss Position</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="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/totalLabel">Total undiscounted lease payments</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_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_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="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/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/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/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/verboseLabel">Core deposit intangibles</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="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/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/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="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="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="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="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="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="dei_DocumentPeriodEndDate_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Document Period End Date</link:label>
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          <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_NetCashProvidedByUsedInFinancingActivities_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Net cash used in financing activities</link:label>
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          <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="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/terseLabel">Service charges on deposit accounts</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="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/documentation">Allowance for loan and lease loss, recovery (write-offs).</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_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_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="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_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_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_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_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_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_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_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_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/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_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_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="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_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/terseLabel">Loans held for investment - 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/documentation">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/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/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/verboseLabel">Loans held for investment</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_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/totalLabel">Income Tax Expense (Benefit), Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DividendsCommonStockCash_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Dividends, Common Stock, Cash</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DividendsCommonStockCash_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Cash dividends declared</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_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="pb_InterestPayableNoncurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Interest payable noncurrent.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_InterestPayableNoncurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Interest payable noncurrent</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_InterestPayableNoncurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Interest payable</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">2024</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 on sale or write-down of assets</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/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="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="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/terseLabel">Net decrease in securities sold under repurchase agreements</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="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="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="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="us-gaap_BusinessCombinationsAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Business Combinations [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/documentation">Related to the consumer and other portfolio segment.</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/terseLabel">Consumer and Other [Member]</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_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/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/totalLabel">Total shareholders&#8217; equity</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_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="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="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/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="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_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/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_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_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_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_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_PaymentsToAcquireBusinessesGross_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Payments to Acquire Businesses, Gross</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PaymentsToAcquireBusinessesGross_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Payments to acquire businesses in cash</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="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_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/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/2009/role/negatedLabel">Net decrease (increase) in loans held for investment</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_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/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/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/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/verboseLabel">Goodwill resulting from acquisition</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_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/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_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_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_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="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="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="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="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="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/totalLabel">Financing Receivable, before Allowance for Credit Loss, Total</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_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="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="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/terseLabel">Securities Concentration Risk [Member]</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="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_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_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="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="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/terseLabel">Grade 3 [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PledgingPurposeDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Pledging Purpose [Domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PledgingPurposeDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Pledging Purpose</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">Schedule of Business Acquisitions, by Acquisition [Table]</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="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/2009/role/negatedLabel">Discount</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_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/terseLabel">Initial allowance on loans purchased with credit deterioration</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="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/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="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_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="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_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="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/totalLabel">Securities Sold under Agreements to Repurchase, Total</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="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="us-gaap_BusinessAcquisitionAcquireeDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Business Acquisition, Acquiree [Domain]</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_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_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="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="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/terseLabel">Grade 6 [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/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="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/terseLabel">Current-period gross write-offs, Revolving Loans</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>
          <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_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_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_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="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_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_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">2027</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_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_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="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="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="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="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/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/terseLabel">Current-period gross write-offs, 2021</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_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="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_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/terseLabel">Grade 4 [Member]</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="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/terseLabel">Contractual Obligations And Off Balance Sheet Items [Line Items]</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_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="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="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/terseLabel">Troubled Debt Restructuring [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLeaseRightOfUseAsset_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Operating Lease, Right-of-Use Asset</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLeaseRightOfUseAsset_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Operating lease, right-of-use asset</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLeaseRightOfUseAsset_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Operating lease right of use asset</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_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_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="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="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="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/terseLabel">Schedule Of Intangible Assets And Goodwill [Table]</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">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/totalLabel">Earnings Per Share, Diluted, Total</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_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="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/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/terseLabel">Current-period gross write-offs, 2020</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_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_NetCashProvidedByUsedInInvestingActivities_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Net cash provided by investing activities</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">Net Cash Provided by (Used in) Investing Activities</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="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/terseLabel">Nonperforming Financial Instruments [Member]</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>
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          <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_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/totalLabel">Interest and Dividend Income, Securities, Operating, Total</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="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_OtherBorrowings_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Other Borrowings</link:label>
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          <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="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="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="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/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/label">Agriculture And Agriculture Real Estate Includes Farmland [Member]</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_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_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_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="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_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_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_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="us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block]</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>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_GuaranteeObligationsNatureDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Guarantor Obligations, Nature [Domain]</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>
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          <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="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="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="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/terseLabel">General reserve</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="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_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_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/totalLabel">Share-Based Payment Arrangement, Noncash Expense, Total</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_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="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_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/terseLabel">Non-performing Assets</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="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_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="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="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/2009/role/negatedLabel">Net accretion of discount on 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="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="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="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="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="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/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_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_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/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="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="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/terseLabel">First Bancshares of Texas, Inc. [Member]</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_NumberOfFullServiceBankingOffices_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Number of full-service banking offices.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_NumberOfFullServiceBankingOffices_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Number Of Full Service Banking Offices</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_NumberOfFullServiceBankingOffices_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Number of full-service banking offices</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_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_EarningsPerShareTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Earnings Per Share [Text Block]</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/label">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/terseLabel">Entity Emerging Growth Company</link:label>
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          <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>
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          <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>
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          <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>
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          <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>
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          <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_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_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_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_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_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/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/2009/role/negatedLabel">Core Deposit Intangibles, Amortization</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="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_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_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_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_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="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="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/terseLabel">2012 Stock Incentive Plan [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_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_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_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_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/totalLabel">Noninterest-Bearing Deposit Liabilities, Total</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="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_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/verboseLabel">Common stock issued in connection with the acquisition</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 Loss Associated with Securities Available for Sale, Net of Tax</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="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/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_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_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/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/verboseLabel">Available for Sale</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="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/totalLabel">Interest Expense, Deposits, Total</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/label">Noninterest Expense</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>
          <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="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_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_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_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract]</link:label>
          <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>
          <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="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/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/verboseLabel">PROVISION FOR CREDIT LOSSES</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="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_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="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="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/terseLabel">Purchased And Non Purchased Credit Impaired Loans [Line Items]</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="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_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_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_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_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="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_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="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_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="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_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS</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 Equivalents, Restricted Cash, and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect</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_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/terseLabel">Percentage of Loans Related to Single Industry on 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/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="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/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="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_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_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_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="srt_ContractualObligationFiscalYearMaturityScheduleTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Contractual Obligation, Fiscal Year Maturity [Table Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_ContractualObligationFiscalYearMaturityScheduleTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Summary of Future Cash Payments Associated with Contractual Obligations Pursuant to Subordinated Debentures, Federal Reserve's Bank Term Funding Program and Federal Home Loan Bank Advances</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLeaseLiabilityStatementOfFinancialPositionExtensibleList_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Operating Lease, Liability, Statement of Financial Position [Extensible Enumeration]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLeaseLiabilityStatementOfFinancialPositionExtensibleList_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Operating Lease, Liability, Statement of Financial Position [Extensible Enumeration]</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="us-gaap_ForeclosedAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Repossessed Assets</link:label>
          <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_ForeclosedAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Repossessed Assets, Total</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="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/terseLabel">Related Party Loans</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_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_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_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/verboseLabel">Provision for credit losses on loans</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityShellCompany_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Entity Shell Company</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityShellCompany_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Entity Shell Company</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="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/terseLabel">Purchased And Non Purchased Credit Impaired Loans [Table]</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_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_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="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/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="dei_EntityTaxIdentificationNumber_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Entity Tax Identification Number</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityTaxIdentificationNumber_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Entity Tax Identification Number</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="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_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="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_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="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/2003/role/terseLabel">Net charge-offs</link:label>
          <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="dei_EntityCurrentReportingStatus_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Entity Current Reporting Status</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_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_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_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="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="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="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_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_LongtermDebtTypeAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Long-Term Debt, Type [Axis]</link:label>
          <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="pb_ResidentialMortgageLoansMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Residential Mortgage Loans [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_ResidentialMortgageLoansMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Residential Mortgage Loans [Member]</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_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="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="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/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/terseLabel">Loans</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="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="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="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="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_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="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="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="us-gaap_DebtSecuritiesRealizedGainLoss_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Debt Securities, Realized Gain (Loss)</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/totalLabel">Debt Securities, Realized Gain (Loss), Total</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>
          <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_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_TreasuryStockValueAcquiredCostMethod_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Treasury Stock, Value, Acquired, Cost Method</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_TreasuryStockValueAcquiredCostMethod_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_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_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/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="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Including Disposal Group and Discontinued Operations</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/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/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="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="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/2009/role/negatedLabel">Net amortization of premium on deposits</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_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_BusinessAcquisitionAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Business Acquisition [Axis]</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="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="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="us-gaap_ContractualObligationDueInNextTwelveMonths_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Contractual Obligation, to be Paid, Year One</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>
          <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_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="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="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/terseLabel">Number of Investment Securities Segments</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="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_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="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_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="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="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="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_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/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/periodEndLabel">Preferred Stock, Shares Outstanding, Ending Balance</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_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="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_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/terseLabel">CARES Act [Member]</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_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="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="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/terseLabel">Credit losses</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="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_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="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_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_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="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_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="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/periodStartLabel">BALANCE (in shares)</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="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/terseLabel">Weighted-Average Interest Rate Received</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="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="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_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/terseLabel">Nonsufficient funds (NSF) 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/documentation">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/label">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_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_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/totalLabel">Available for Sale, Amortized Cost</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_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/totalLabel">Goodwill and Intangible Asset Impairment, Total</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_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_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_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_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_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_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="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/totalLabel">Amortization of Debt Issuance Costs and Discounts, Total</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_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/totalLabel">Payments to Acquire Property, Plant, and Equipment, Total</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="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="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="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/terseLabel">Paycheck Protection Program [Member]</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_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_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/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/2009/role/negatedLabel">Decrease in accrued interest receivable and other assets</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">2026</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_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/totalLabel">Interest and Fee Income, Loans and Leases, Total</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="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/terseLabel">Outstanding balance</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_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_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="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="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_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/terseLabel">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/documentation">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/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/terseLabel">Weighted-Average Interest Rate Paid</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 2024</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="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="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="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_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_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_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_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="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="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/terseLabel">Financial Institution Counterparty [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_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_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract]</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_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_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_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">2025</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="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/terseLabel">Credit and debit card, data processing and software amortization</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="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/terseLabel">Funded 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/label">Payment Deferral [Member]</link:label>
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          <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="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="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="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_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_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/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_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_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/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/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/negatedTotalLabel">Held to Maturity, Unrealized Losses, Total</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/label">Goodwill and Intangible Assets Disclosure [Abstract]</link:label>
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          <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="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 in accrued interest payable and other liabilities</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/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/terseLabel">Accumulated other comprehensive loss net unrealized loss on available for sale securities, tax benefit</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>
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          <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_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_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_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="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="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/terseLabel">Current-period gross write-offs, Prior</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">2025</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_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_DepreciationAmortizationAndAccretionNet_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Depreciation, Amortization and Accretion, Net</link:label>
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          <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="pb_OneTermAdvanceMaturityDate_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">One-term advance maturity date</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_OneTermAdvanceMaturityDate_lbl" xlink:role="http://www.xbrl.org/2003/role/label">One-Term Advance Maturity Date</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_OneTermAdvanceMaturityDate_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">One-term advance maturity date.</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; 95,260,666 issued and outstanding at September 30, 2024; 93,722,383 shares issued and outstanding at December 31, 2023</link:label>
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          <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="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_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_GainLossOnDispositionOfAssets1_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Net gain (loss) on sale or write-down of assets</link:label>
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          <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="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="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/terseLabel">Farmland [Member]</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_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_OperatingLeaseLiability_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Operating Lease, Liability</link:label>
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          <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="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/terseLabel">Bank Term Funding Program [Member]</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>
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          <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_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="us-gaap_IncomeTaxesPaid_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Income Taxes Paid</link:label>
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          <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_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">2021</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_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_WeightedAverageNumberOfDilutedSharesOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Weighted Average Number of Shares Outstanding, Diluted</link:label>
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          <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>
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          <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_DerivativeLiabilityFairValueNetAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Derivative financial instruments:</link:label>
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          <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="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_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="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="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/terseLabel">Grade 7 [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_TreasuryStockSharesAcquired_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Treasury Stock, Shares, Acquired</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_TreasuryStockSharesAcquired_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_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_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_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="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="pb_AdditionsToImpairedLoans_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Additions to impaired loans.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_AdditionsToImpairedLoans_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Additions To Impaired Loans</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="pb_AdditionsToImpairedLoans_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Additions to impaired loans</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_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/terseLabel">Construction, Land Development and Other Land Loans [Member]</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_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_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/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/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_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_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="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="pb_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFour_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Finite Lived Intangible Assets Amortization Expense After Year Four</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>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ContractualObligation_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Contractual Obligation</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ContractualObligation_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_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 decrease in noninterest-bearing deposits</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_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_Deposits_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Deposits</link:label>
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          <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_NetCashProvidedByUsedInFinancingActivitiesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Net Cash Provided by (Used in) Financing Activities [Abstract]</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_LiabilitiesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Liabilities [Abstract]</link:label>
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          <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="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_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_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_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/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/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/periodEndLabel">Other Real Estate, Ending Balance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SubordinatedDebt_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Subordinated Debt, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SubordinatedDebt_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel">Subordinated Debt, Beginning Balance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SubordinatedDebt_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel">Subordinated Debt, Ending Balance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SubordinatedDebt_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Subordinated Debt</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SubordinatedDebt_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Subordinated debentures</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/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/terseLabel">Net proceeds from other short-term borrowings</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_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_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="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_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="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_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_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Other comprehensive (loss) 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/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/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_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_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_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_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_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_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_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="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_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>
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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>
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          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="pb_LoanModificationsMadeToBorrowersExperiencingFinancialDifficultyPercentage" xlink:to="pb_LoanModificationsMadeToBorrowersExperiencingFinancialDifficultyPercentage_lbl"/>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_DebtInstrumentInterestRateDuringPeriod" xlink:to="us-gaap_DebtInstrumentInterestRateDuringPeriod_lbl"/>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AllowanceForCreditLossesOnFinancingReceivablesTableTextBlock" xlink:to="us-gaap_AllowanceForCreditLossesOnFinancingReceivablesTableTextBlock_lbl"/>
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          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ConversionOfStockAmountConverted1" xlink:to="us-gaap_ConversionOfStockAmountConverted1_lbl"/>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_PlanNameDomain" xlink:to="us-gaap_PlanNameDomain_lbl"/>
          <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_DerivativesFairValueLineItems" xlink:to="us-gaap_DerivativesFairValueLineItems_lbl"/>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityAddressPostalZipCode" xlink:to="dei_EntityAddressPostalZipCode_lbl"/>
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  <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_FinancingReceivableLoanModificationsFinancialEffectTableTextBlock" name="FinancingReceivableLoanModificationsFinancialEffectTableTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="pb_CertainLoanAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldReclassificationsToFromNonaccretableDifference" name="CertainLoanAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldReclassificationsToFromNonaccretableDifference" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="pb_DerivativeWeightedAverageInterestRatePaid" name="DerivativeWeightedAverageInterestRatePaid" type="xbrli:pureItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" 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_DerivativeWeightedAverageInterestRateReceived" name="DerivativeWeightedAverageInterestRateReceived" type="xbrli:pureItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false"/>
  <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_SecuritiesConcentrationRiskMember" name="SecuritiesConcentrationRiskMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
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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"/>
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  <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_AccountingStandardsUpdatesExtensibleList" name="AccountingStandardsUpdatesExtensibleList" type="xbrli:tokenItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <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_AllowanceForLoansAndLeaseLossesWriteoffs" name="AllowanceForLoansAndLeaseLossesWriteoffs" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <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_ScheduleOfNonperformingAssetsTableTextBlock" name="ScheduleOfNonperformingAssetsTableTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="pb_NoninterestIncomeServiceChargesOnDepositAccounts" name="NoninterestIncomeServiceChargesOnDepositAccounts" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <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_ConstructionLandDevelopmentAndOtherLandLoansMember" name="ConstructionLandDevelopmentAndOtherLandLoansMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <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_ContractualObligationsAndOffBalanceSheetItemsLineItems" name="ContractualObligationsAndOffBalanceSheetItemsLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="pb_OneTermAdvanceMaturityDate" name="OneTermAdvanceMaturityDate" type="xbrli:gYearMonthItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
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  <xsd:element id="pb_CommercialRealEstateIncludesMultifamilyResidentialMember" name="CommercialRealEstateIncludesMultifamilyResidentialMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
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  <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_IncreaseDecreaseInAllowanceForCreditLossesPercent" name="IncreaseDecreaseInAllowanceForCreditLossesPercent" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <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_ProvisionForCreditLosses" name="ProvisionForCreditLosses" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <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_NetAccretionOfDiscountOnDeposits" name="NetAccretionOfDiscountOnDeposits" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="pb_LoneStarStateBancsharesIncMember" name="LoneStarStateBancsharesIncMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="pb_NonaccrualLoansToTotalLoansExcludingWarehousePurchaseProgramLoans" name="NonaccrualLoansToTotalLoansExcludingWarehousePurchaseProgramLoans" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false"/>
  <xsd:element id="pb_ScheduleOfRelatedPartyLoansTableTextBlock" name="ScheduleOfRelatedPartyLoansTableTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="pb_GainOnStockExchange" name="GainOnStockExchange" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="pb_CommercialLoanInterestRateSwapAndCapMember" name="CommercialLoanInterestRateSwapAndCapMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="pb_WestTexasMember" name="WestTexasMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="pb_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionsFairValue" name="HeldToMaturitySecuritiesContinuousUnrealizedLossPositionsFairValue" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit"/>
  <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_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionsAccumulatedLoss" name="HeldToMaturitySecuritiesContinuousUnrealizedLossPositionsAccumulatedLoss" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit"/>
  <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_CARESActMember" name="CARESActMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <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_PurchasedAndNonPurchasedCreditImpairedLoansLineItems" name="PurchasedAndNonPurchasedCreditImpairedLoansLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="pb_LSSBMergerMember" name="LSSBMergerMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="pb_FinancialEffectOnModificationsMaidOnLoanDueToInterestRateReduction" name="FinancialEffectOnModificationsMaidOnLoanDueToInterestRateReduction" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <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_InterestRateSwapsAndLoansReceivableDescriptionOfIndexRateBasis" name="InterestRateSwapsAndLoansReceivableDescriptionOfIndexRateBasis" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <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_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentTax" name="AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentTax" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
  <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_NetIncreaseDecreaseInSecuritiesSoldUnderRepurchaseAgreements" name="NetIncreaseDecreaseInSecuritiesSoldUnderRepurchaseAgreements" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
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  <xsd:element id="pb_NumberOfFullServiceBankingOffices" name="NumberOfFullServiceBankingOffices" type="xbrli:integerItemType" 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_FinancingReceivableAmortizedCostOfLoansExperiencingFinancialDifficultyAndModifiedTableTextBlock" name="FinancingReceivableAmortizedCostOfLoansExperiencingFinancialDifficultyAndModifiedTableTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
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  <xsd:element id="pb_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionsLessThan12MonthsAccumulatedLoss" name="HeldToMaturitySecuritiesContinuousUnrealizedLossPositionsLessThan12MonthsAccumulatedLoss" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit"/>
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  <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_PercentageOfLoanPortfolioWhichUsedLondonInterbankOfferedRateIndex" name="PercentageOfLoanPortfolioWhichUsedLondonInterbankOfferedRateIndex" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false"/>
  <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_SecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositionsGreaterThanOrEqualToOneYear" name="SecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositionsGreaterThanOrEqualToOneYear" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false"/>
  <xsd:element id="pb_MergerMember" name="MergerMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <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_Grade3Member" name="Grade3Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="pb_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFour" name="FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFour" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit"/>
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  <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_ChangesInAccretableYieldForPciAndNonPciLoansTable" name="ChangesInAccretableYieldForPciAndNonPciLoansTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <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_LoansAndLeaseReceivableAllowance" name="LoansAndLeaseReceivableAllowance" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
  <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_UnvestedRestrictedStockMember" name="UnvestedRestrictedStockMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <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_CertainLoanAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield" name="CertainLoanAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="pb_PledgedAssetsValueAtPar" name="PledgedAssetsValueAtPar" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
  <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_LoanToBeConsideredAsPaymentDefaultInPeriod" name="LoanToBeConsideredAsPaymentDefaultInPeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <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_AllowanceForCreditLossesAsPercentageOfLoans" name="AllowanceForCreditLossesAsPercentageOfLoans" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false"/>
  <xsd:element id="pb_ChangesInAccretableYieldForPciAndNonPciLoansLineItems" name="ChangesInAccretableYieldForPciAndNonPciLoansLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <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_LoansAndLeaseReceivableImpairedNonperformingNonaccrualOfInterest" name="LoansAndLeaseReceivableImpairedNonperformingNonaccrualOfInterest" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="pb_OutstandingAmoutConsistingOfOneTermAdvance" name="OutstandingAmoutConsistingOfOneTermAdvance" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" 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_CommitmentsExpectedToFund" name="CommitmentsExpectedToFund" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
  <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_CertainLoanAcquiredInTransferNotAccountedForAsDebtSecuritiesOutstandingBalance" name="CertainLoanAcquiredInTransferNotAccountedForAsDebtSecuritiesOutstandingBalance" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit"/>
  <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_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesDiscount" name="CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesDiscount" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="pb_InterestPayableNoncurrent" name="InterestPayableNoncurrent" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
  <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_ProvisionForLoansAndLeaseLosses" name="ProvisionForLoansAndLeaseLosses" 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"/>
  <xsd:element id="pb_NumberOfBankingCenters" name="NumberOfBankingCenters" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="pb_TroubledDebtRestructuringMember" name="TroubledDebtRestructuringMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="pb_CertainLoanAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldAdditions" name="CertainLoanAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldAdditions" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="pb_HeldToMaturitySecuritiesContinuousUnrealizedLossPositions12MonthsOrLongerAccumulatedLoss" name="HeldToMaturitySecuritiesContinuousUnrealizedLossPositions12MonthsOrLongerAccumulatedLoss" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit"/>
  <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_NonperformingAssetsToLoansExcludingWarehousePurchaseProgramLoansAndOtherRealEstate" name="NonperformingAssetsToLoansExcludingWarehousePurchaseProgramLoansAndOtherRealEstate" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false"/>
  <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_AgricultureAndAgricultureRealEstateIncludesFarmlandMember" name="AgricultureAndAgricultureRealEstateIncludesFarmlandMember" 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_StockIncentive2012PlanMember" name="StockIncentive2012PlanMember" 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"/>
  <xsd:element id="pb_LoansAndLeasesReceivableNetOfDeferredIncomeAndLoanReceivableCurrentPeriodGrossWriteoffsTwoYearsBeforeLatestFiscalYear" name="LoansAndLeasesReceivableNetOfDeferredIncomeAndLoanReceivableCurrentPeriodGrossWriteoffsTwoYearsBeforeLatestFiscalYear" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
  <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_LoansAndLeasesReceivableNetOfDeferredIncomeAndLoanReceivableCurrentPeriodGrossWriteOffsRevolvingLoansConvertedToTermLoans" name="LoansAndLeasesReceivableNetOfDeferredIncomeAndLoanReceivableCurrentPeriodGrossWriteOffsRevolvingLoansConvertedToTermLoans" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="pb_ScheduleOfOffBalanceSheetCreditLossLiabilityTableTextBlock" name="ScheduleOfOffBalanceSheetCreditLossLiabilityTableTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <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_DebitCardDataProcessingAndSoftwareAmortization" name="DebitCardDataProcessingAndSoftwareAmortization" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <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_WestNorthAndCentralTexasMember" name="WestNorthAndCentralTexasMember" 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_ConsumerAndOtherMember" name="ConsumerAndOtherMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <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_SubordinatedDebentures" name="SubordinatedDebentures" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="pb_NumberOfSubleaseArrangement" name="NumberOfSubleaseArrangement" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="pb_NumberOfStockBasedEmployeeCompensationPlans" name="NumberOfStockBasedEmployeeCompensationPlans" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" 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_RecordedInvestmentAndOutstandingBalanceForPurchasedCreditDeterioratedLoansAndNonPurchasedCreditDeterioratedLoansTextBlock" name="RecordedInvestmentAndOutstandingBalanceForPurchasedCreditDeterioratedLoansAndNonPurchasedCreditDeterioratedLoansTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="pb_LoansAndLeasesReceivableNetOfDeferredIncomeAndLoanReceivableCurrentPeriodGrossWriteoffsThreeYearsBeforeLatestFiscalYear" name="LoansAndLeasesReceivableNetOfDeferredIncomeAndLoanReceivableCurrentPeriodGrossWriteoffsThreeYearsBeforeLatestFiscalYear" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
  <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_MunicipalSecuritiesPercentageOfSecuritiesPortfolio" name="MunicipalSecuritiesPercentageOfSecuritiesPortfolio" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false"/>
  <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_FinancialEffectOnModificationsMaidOnLoanDueToPaymentDelay" name="FinancialEffectOnModificationsMaidOnLoanDueToPaymentDelay" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <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_SummaryOfChangesInAccretableYieldsOfAcquiredLoansTableTextBlock" name="SummaryOfChangesInAccretableYieldsOfAcquiredLoansTableTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <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_FinancialEffectOnModificationsMaidOnLoanDueToTermExtension" name="FinancialEffectOnModificationsMaidOnLoanDueToTermExtension" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <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_UnrealizedGainOnStockExchange" name="UnrealizedGainOnStockExchange" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="pb_NoninterestIncomeTrust" name="NoninterestIncomeTrust" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
</xsd:schema>
