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  <xsd:element name="LoansReceivableCommercialFinancialAndAgriculturalMember" id="iboc_LoansReceivableCommercialFinancialAndAgriculturalMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="SpecialPassMember" id="iboc_SpecialPassMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardOptionTypeAxis" id="iboc_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardOptionTypeAxis" type="xbrli:stringItemType" substitutionGroup="xbrldt:dimensionItem" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="IncentiveStockOptionsTo10PercentShareholdersMember" id="iboc_IncentiveStockOptionsTo10PercentShareholdersMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="TrustSixMember" id="iboc_TrustSixMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="TrustSevenMember" id="iboc_TrustSevenMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="TrustEightMember" id="iboc_TrustEightMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="TrustNineMember" id="iboc_TrustNineMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="TrustElevenMember" id="iboc_TrustElevenMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="TrustTenMember" id="iboc_TrustTenMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="TrustTwelveMember" id="iboc_TrustTwelveMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="BondMeetingOriginalContractTermsMember" id="iboc_BondMeetingOriginalContractTermsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="BondNotMeetingOriginalContractTermsMember" id="iboc_BondNotMeetingOriginalContractTermsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DocumentAndEntityInformationAbstract" id="iboc_DocumentAndEntityInformationAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="CashCashEquivalentsAndFederalFundsSoldExcludingTimeDeposits" id="iboc_CashCashEquivalentsAndFederalFundsSoldExcludingTimeDeposits" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="InterestExpenseOtherBorrowings" id="iboc_InterestExpenseOtherBorrowings" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="InterestExpenseSavingsAndDemandDepositAccounts" id="iboc_InterestExpenseSavingsAndDemandDepositAccounts" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="OtherServiceChargesCommissionsAndFeesAbstract" id="iboc_OtherServiceChargesCommissionsAndFeesAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ServiceChargesFeesAndCommissionsOtherBanking" id="iboc_ServiceChargesFeesAndCommissionsOtherBanking" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="LitigationExpense" id="iboc_LitigationExpense" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="OtherThanTemporaryImpairmentLossesInvestmentPortionRecognizedInEarningsNet" id="iboc_OtherThanTemporaryImpairmentLossesInvestmentPortionRecognizedInEarningsNet" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="AccretionOfDiscountsInvestments" id="iboc_AccretionOfDiscountsInvestments" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="AccretionOfTimeDepositDiscounts" id="iboc_AccretionOfTimeDepositDiscounts" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="AmortizationOfInvestmentSecuritiesPremiums" id="iboc_AmortizationOfInvestmentSecuritiesPremiums" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="AmortizationOfLoansReceivablePremiums" id="iboc_AmortizationOfLoansReceivablePremiums" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="AccretionOfDiscountsOnTimeDepositsWithBanks" id="iboc_AccretionOfDiscountsOnTimeDepositsWithBanks" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="DepreciationAndAmortizationOfLeasedAssets" id="iboc_DepreciationAndAmortizationOfLeasedAssets" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="ChangeInFairValueOfLoansOtherRealEstateOwned" id="iboc_ChangeInFairValueOfLoansOtherRealEstateOwned" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="DistributionsFromOtherInvestments" id="iboc_DistributionsFromOtherInvestments" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="AdjustmentToGoodwillRelatedTaxContingencies" id="iboc_AdjustmentToGoodwillRelatedTaxContingencies" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="IncreaseDecreaseInNoninterestBearingDemandDeposits" id="iboc_IncreaseDecreaseInNoninterestBearingDemandDeposits" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="IncreaseDecreaseInSavingAndInterestBearingDemandDeposits" id="iboc_IncreaseDecreaseInSavingAndInterestBearingDemandDeposits" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="PaymentsOfCashDividendsInLieuOfFractionalShares" id="iboc_PaymentsOfCashDividendsInLieuOfFractionalShares" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="DividendsPreferredStockAccrued" id="iboc_DividendsPreferredStockAccrued" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="InvestmentSecuritiesPurchasesNotYetSettled" id="iboc_InvestmentSecuritiesPurchasesNotYetSettled" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="AccruedPartialRedemptionOfPreferredSecuritiesNonCashFinancingAndInvestingActivitiesImpact" id="iboc_AccruedPartialRedemptionOfPreferredSecuritiesNonCashFinancingAndInvestingActivitiesImpact" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="InvestmentSecuritiesSoldNotYetSettled" id="iboc_InvestmentSecuritiesSoldNotYetSettled" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="BasisOfPresentationDisclosureAbstract" id="iboc_BasisOfPresentationDisclosureAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="BasisOfPresentationTextBlock" id="iboc_BasisOfPresentationTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="AllowanceForProbableLoanLossesDisclosureAbstract" id="iboc_AllowanceForProbableLoanLossesDisclosureAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="OtherBorrowedFundsDisclosureAbstract" id="iboc_OtherBorrowedFundsDisclosureAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ScheduleOfShareBasedCompensationNonvestedStockOptionsActivityTableTextBlock" id="iboc_ScheduleOfShareBasedCompensationNonvestedStockOptionsActivityTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ScheduleOfJuniorSubordinatedBorrowingsTableTextBlock" id="iboc_ScheduleOfJuniorSubordinatedBorrowingsTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NumberOfActiveOperatingSubsidiaries" id="iboc_NumberOfActiveOperatingSubsidiaries" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="EntityNumberOfInsuranceRelatedSubsidiaries" id="iboc_EntityNumberOfInsuranceRelatedSubsidiaries" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NumberOfComponentsOtherThanTemporaryImpairmentSegregated" id="iboc_NumberOfComponentsOtherThanTemporaryImpairmentSegregated" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NonAccrualLoansAbstract" id="iboc_NonAccrualLoansAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="MinimumPeriodForPastDueUnsecuredLoansOutstandingNotPlacedOnNonAccrualStatusUnderSpecialCircumstances" id="iboc_MinimumPeriodForPastDueUnsecuredLoansOutstandingNotPlacedOnNonAccrualStatusUnderSpecialCircumstances" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="MaximumPeriodOutstandingNonConsumerLoansAreEvaluatedForNonAccrualStatus" id="iboc_MaximumPeriodOutstandingNonConsumerLoansAreEvaluatedForNonAccrualStatus" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="IncomeTaxesAbstract" id="iboc_IncomeTaxesAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="PercentageOfLikelihoodOfRealizationOfRecognizedTaxBenefit" id="iboc_PercentageOfLikelihoodOfRealizationOfRecognizedTaxBenefit" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ConsolidatedStatementsOfCashFlowsAbstract" id="iboc_ConsolidatedStatementsOfCashFlowsAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="MaximumTermOfMaturityToClassifyShortTermInvestmentsAsCashEquivalents" id="iboc_MaximumTermOfMaturityToClassifyShortTermInvestmentsAsCashEquivalents" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="CashFlowReclassificationMember" id="iboc_CashFlowReclassificationMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ImpairedFinancingReceivableRecordedInvestmentFairValueDisclosure" id="iboc_ImpairedFinancingReceivableRecordedInvestmentFairValueDisclosure" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="OtherRealEstateAndForeclosedAssetsInUse" id="iboc_OtherRealEstateAndForeclosedAssetsInUse" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="FairValueMeasurementsDiscountedCashFlowModelAssumptionsFuturePrincipalPrepaymentRatesLowEndOfRange" id="iboc_FairValueMeasurementsDiscountedCashFlowModelAssumptionsFuturePrincipalPrepaymentRatesLowEndOfRange" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="FairValueMeasurementsDiscountedCashFlowModelAssumptionsFuturePrincipalPrepaymentRatesHighEndOfRange" id="iboc_FairValueMeasurementsDiscountedCashFlowModelAssumptionsFuturePrincipalPrepaymentRatesHighEndOfRange" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="FairValueMeasurementsDiscountedCashFlowModelAssumptionsFuturePrincipalPrepaymentDiscountRate" id="iboc_FairValueMeasurementsDiscountedCashFlowModelAssumptionsFuturePrincipalPrepaymentDiscountRate" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="FairValueMeasurementsDiscountedCashFlowModelAssumptionsDefaultRatesForFirstYearLowEndOfRange" id="iboc_FairValueMeasurementsDiscountedCashFlowModelAssumptionsDefaultRatesForFirstYearLowEndOfRange" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="FairValueMeasurementsDiscountedCashFlowModelAssumptionsDefaultRatesForFirstYearHighEndOfRange" id="iboc_FairValueMeasurementsDiscountedCashFlowModelAssumptionsDefaultRatesForFirstYearHighEndOfRange" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="FairValueMeasurementsDiscountedCashFlowModelAssumptionsDefaultRatesThereafter" id="iboc_FairValueMeasurementsDiscountedCashFlowModelAssumptionsDefaultRatesThereafter" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="FairValueMeasurementsDiscountedCashFlowModelAssumptionsLossSeverityRatesForFirstYear" id="iboc_FairValueMeasurementsDiscountedCashFlowModelAssumptionsLossSeverityRatesForFirstYear" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="FairValueMeasurementsDiscountedCashFlowModelAssumptionsDeclineInLossSeverityRatesForFollowingThreeYears" id="iboc_FairValueMeasurementsDiscountedCashFlowModelAssumptionsDeclineInLossSeverityRatesForFollowingThreeYears" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="FairValueMeasurementsDiscountedCashFlowModelAssumptionsLossSeverityRatesThereafter" id="iboc_FairValueMeasurementsDiscountedCashFlowModelAssumptionsLossSeverityRatesThereafter" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="SpecificValuationAllowanceImpairedFinancingReceivableFairValueDisclosure" id="iboc_SpecificValuationAllowanceImpairedFinancingReceivableFairValueDisclosure" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="SpecificValuationAllowanceOtherRealEstateAndForeclosedAssetsInUse" id="iboc_SpecificValuationAllowanceOtherRealEstateAndForeclosedAssetsInUse" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="ChangeInProvisionOfImpairedFinancingReceivableFairValueDisclosure" id="iboc_ChangeInProvisionOfImpairedFinancingReceivableFairValueDisclosure" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="ChangeInProvisionOfOtherRealEstateAndForeclosedAssetsInUse" id="iboc_ChangeInProvisionOfOtherRealEstateAndForeclosedAssetsInUse" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="AllowanceForLoanLeaseLossesWriteOffsPriorToForeclosure" id="iboc_AllowanceForLoanLeaseLossesWriteOffsPriorToForeclosure" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="FairValueMeasurementsDiscountedCashFlowModelAssumptionsDefaultRatesForFirstYear" id="iboc_FairValueMeasurementsDiscountedCashFlowModelAssumptionsDefaultRatesForFirstYear" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="FairValueMeasurementsDiscountedCashFlowModelAssumptionsDeclineInLossSeverityRatesForFollowingFifthYear" id="iboc_FairValueMeasurementsDiscountedCashFlowModelAssumptionsDeclineInLossSeverityRatesForFollowingFifthYear" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="FairValueMeasurementsDiscountedCashFlowModelAssumptionsDefaultRates" id="iboc_FairValueMeasurementsDiscountedCashFlowModelAssumptionsDefaultRates" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossAbstract" id="iboc_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="TimeDepositsFairValueDisclosure" id="iboc_TimeDepositsFairValueDisclosure" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="LoansReceivableWithFixedRateOfInterest" id="iboc_LoansReceivableWithFixedRateOfInterest" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="LoansReceivableWithFixedRateOfInterestFairValueDisclosure" id="iboc_LoansReceivableWithFixedRateOfInterestFairValueDisclosure" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="SecuritiesSoldUnderLongTermAgreementsToRepurchase" id="iboc_SecuritiesSoldUnderLongTermAgreementsToRepurchase" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="JuniorSubordinatedDebentureWithFixedRatesOfInterestOwedToUnconsolidatedSubsidiaryTrust" id="iboc_JuniorSubordinatedDebentureWithFixedRatesOfInterestOwedToUnconsolidatedSubsidiaryTrust" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="FederalHomeLoanBankAdvancesLongTermFairValueDisclosure" id="iboc_FederalHomeLoanBankAdvancesLongTermFairValueDisclosure" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="ReceivablesFromDomesticOperationsMember" id="iboc_ReceivablesFromDomesticOperationsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="AllowanceForLoanAndLeaseLossesWriteOffsNet" id="iboc_AllowanceForLoanAndLeaseLossesWriteOffsNet" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="AllowanceForLoansAndLeasesLossesRecoveriesOfBadDebts" id="iboc_AllowanceForLoansAndLeasesLossesRecoveriesOfBadDebts" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="RisksRelatedToFamilyDevelopmentLoansAbstract" id="iboc_RisksRelatedToFamilyDevelopmentLoansAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="MinimumNumberOfFamilyDevelopmentLoans" id="iboc_MinimumNumberOfFamilyDevelopmentLoans" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="MaximumNumberOfFamilyDevelopmentLoans" id="iboc_MaximumNumberOfFamilyDevelopmentLoans" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="FinancingReceivableRecordedInvestmentNonaccrualStatusReductionInInterestIncome" id="iboc_FinancingReceivableRecordedInvestmentNonaccrualStatusReductionInInterestIncome" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="PeriodOfChargeOffForPastDueUnsecuredCommercialLoans" id="iboc_PeriodOfChargeOffForPastDueUnsecuredCommercialLoans" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardIncreaseInNumberOfSharesAuthorized" id="iboc_ShareBasedCompensationArrangementByShareBasedPaymentAwardIncreaseInNumberOfSharesAuthorized" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsReductionsFromOutstandingAbstract" id="iboc_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsReductionsFromOutstandingAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsReductionsFromOutstandingWeightedAverageExercisePriceAbstract" id="iboc_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsReductionsFromOutstandingWeightedAverageExercisePriceAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsWeightedAverageRemainingContractualTermDisclosuresAbstract" id="iboc_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsWeightedAverageRemainingContractualTermDisclosuresAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAggregateIntrinsicValueDisclosuresAbstract" id="iboc_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAggregateIntrinsicValueDisclosuresAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsNonvestedRollForward" id="iboc_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsNonvestedRollForward" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsNonvestedNumber" id="iboc_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsNonvestedNumber" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedInPeriod" id="iboc_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedInPeriod" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsNonvestedForfeitedInPeriod" id="iboc_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsNonvestedForfeitedInPeriod" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValueAbstract" id="iboc_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValueAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValue" id="iboc_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValue" type="num:perShareItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedInPeriodWeightedAverageGrantDateFairValue" id="iboc_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedInPeriodWeightedAverageGrantDateFairValue" type="num:perShareItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsNonvestedForfeitedInPeriodWeightedAverageGrantDateFairValue" id="iboc_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsNonvestedForfeitedInPeriodWeightedAverageGrantDateFairValue" type="num:perShareItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAdditionalInformationAbstract" id="iboc_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAdditionalInformationAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionTypeDomain" id="iboc_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionTypeDomain" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="HeldToMaturitySecuritiesAbstract" id="iboc_HeldToMaturitySecuritiesAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="AvailableForSaleSecuritiesPledgedAsCollateralAmortizedCost" id="iboc_AvailableForSaleSecuritiesPledgedAsCollateralAmortizedCost" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetAfterTax" id="iboc_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetAfterTax" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="FederalHomeLoanBankAdvancesActivityForNextFiveYearsAmortization" id="iboc_FederalHomeLoanBankAdvancesActivityForNextFiveYearsAmortization" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="PeriodOfAmortizationOfLongTermAdvances" id="iboc_PeriodOfAmortizationOfLongTermAdvances" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="PercentageOfAdvancesFromFederalHomeLoanBanksIncreaseDecrease" id="iboc_PercentageOfAdvancesFromFederalHomeLoanBanksIncreaseDecrease" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ScheduleOfDebtInstrumentsTable" id="iboc_ScheduleOfDebtInstrumentsTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="PortionOfSecuritiesRedeemed" id="iboc_PortionOfSecuritiesRedeemed" type="xbrli:stringItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NumberOfStatutoryBusinessTrustsIssuingPreferredSecurities" id="iboc_NumberOfStatutoryBusinessTrustsIssuingPreferredSecurities" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="MaximumNumberOfConsecutiveSemiAnnualPeriodsAvailableForDeferralOfPaymentOfInterestOnTrustI" id="iboc_MaximumNumberOfConsecutiveSemiAnnualPeriodsAvailableForDeferralOfPaymentOfInterestOnTrustI" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="MaximumNumberOfConsecutiveQuarterlyPeriodsAvailableForDeferralOfPaymentOfInterest" id="iboc_MaximumNumberOfConsecutiveQuarterlyPeriodsAvailableForDeferralOfPaymentOfInterest" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="MaximumPercentageOfCapitalSecuritiesIssuedByTrustQualifyingAsTierOneCapital" id="iboc_MaximumPercentageOfCapitalSecuritiesIssuedByTrustQualifyingAsTierOneCapital" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="CapitalSecuritiesIssuedByTrustQualifyingAsTierOneCapital" id="iboc_CapitalSecuritiesIssuedByTrustQualifyingAsTierOneCapital" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="InitialPeriodOfAccrualOfInterestAtFixedRate" id="iboc_InitialPeriodOfAccrualOfInterestAtFixedRate" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DebtInstrumentDescriptionOfVariableRateBasisAfterFiveYears" id="iboc_DebtInstrumentDescriptionOfVariableRateBasisAfterFiveYears" type="xbrli:stringItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DebtInstrumentBasisSpreadOnVariableRateAfterFiveYears" id="iboc_DebtInstrumentBasisSpreadOnVariableRateAfterFiveYears" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="DividendsPreferredStockFuturePayment" id="iboc_DividendsPreferredStockFuturePayment" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="WarrantsFairValueStandAloneBasis" id="iboc_WarrantsFairValueStandAloneBasis" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="PeriodOfAmortizationOfPreferredStockDiscountOnFairValue" id="iboc_PeriodOfAmortizationOfPreferredStockDiscountOnFairValue" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="AmortizationOfPreferredStockDiscountOnFairValue" id="iboc_AmortizationOfPreferredStockDiscountOnFairValue" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="StockRepurchaseProgramCumulativeSharesRepurchased" id="iboc_StockRepurchaseProgramCumulativeSharesRepurchased" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="StockRepurchaseProgramCumulativeCostOfSharesRepurchased" id="iboc_StockRepurchaseProgramCumulativeCostOfSharesRepurchased" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="PreferredStockDividendRatePercentageForFirstFiveYears" id="iboc_PreferredStockDividendRatePercentageForFirstFiveYears" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="PreferredStockDividendRatePercentageThereafter" id="iboc_PreferredStockDividendRatePercentageThereafter" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="AggregateCommonStockInvestmentAsPercentageOfSeniorPreferredStockInvestmentOnExerciseOfWarrants" id="iboc_AggregateCommonStockInvestmentAsPercentageOfSeniorPreferredStockInvestmentOnExerciseOfWarrants" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ClassOfWarrantOrRightTerm" id="iboc_ClassOfWarrantOrRightTerm" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="MaximumDividendIncomeToBeReceivedFromSubsidiaries" id="iboc_MaximumDividendIncomeToBeReceivedFromSubsidiaries" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="MaximumSemiAnnualCashDividendPayablePerShare" id="iboc_MaximumSemiAnnualCashDividendPayablePerShare" type="num:perShareItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NumberOfPeriodsFollowingDateOfInvestmentThatEntityIsRestrictedFromRedeemingPreferredStock" id="iboc_NumberOfPeriodsFollowingDateOfInvestmentThatEntityIsRestrictedFromRedeemingPreferredStock" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="LengthOfTransitionPeriodUnderFederalReserveBoardFinalRule" id="iboc_LengthOfTransitionPeriodUnderFederalReserveBoardFinalRule" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="MaximumPercentageOfTrustPreferredSecuritiesAndOtherCapitalElementsToTierOneCapital" id="iboc_MaximumPercentageOfTrustPreferredSecuritiesAndOtherCapitalElementsToTierOneCapital" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="PercentageOfTrustPreferredSecuritiesToTierOneCapitalOfBankHoldingCompaniesWithSignificantInternationalOperationsMaximumLimitExpected" id="iboc_PercentageOfTrustPreferredSecuritiesToTierOneCapitalOfBankHoldingCompaniesWithSignificantInternationalOperationsMaximumLimitExpected" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="MaximumPercentageOfConvertiblePreferredSecuritiesToTierOneCapitalElementsOfBankHoldingCompaniesWithSignificantInternationalOperations" id="iboc_MaximumPercentageOfConvertiblePreferredSecuritiesToTierOneCapitalElementsOfBankHoldingCompaniesWithSignificantInternationalOperations" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ExtendedTransitionPeriodUnderFederalReserveBoardFinalRule" id="iboc_ExtendedTransitionPeriodUnderFederalReserveBoardFinalRule" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="MinimumConsolidatedAssetsForApplicationOfCollinsAmendment" id="iboc_MinimumConsolidatedAssetsForApplicationOfCollinsAmendment" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="NoticeOfFinalPartnershipAdministrativeAdjustmentsMember" id="iboc_NoticeOfFinalPartnershipAdministrativeAdjustmentsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ClassOfActionLawsuitsMember" id="iboc_ClassOfActionLawsuitsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="LossContingencyByGeographicRegionAxis" id="iboc_LossContingencyByGeographicRegionAxis" type="xbrli:stringItemType" substitutionGroup="xbrldt:dimensionItem" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="LossContingencyGeographicRegionDomain" id="iboc_LossContingencyGeographicRegionDomain" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="SouthernDistrictOfTexasMember" id="iboc_SouthernDistrictOfTexasMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="SouthernDistrictOfFloridaMember" id="iboc_SouthernDistrictOfFloridaMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NumberOfPartnershipsNoticeOfFPAAIssued" id="iboc_NumberOfPartnershipsNoticeOfFPAAIssued" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="PercentageOfOwnershipInPartnership" id="iboc_PercentageOfOwnershipInPartnership" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="LossContingencyPaymentOfDeposits" id="iboc_LossContingencyPaymentOfDeposits" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="SubsidiaryBanksNumber" id="iboc_SubsidiaryBanksNumber" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="LossContingencyPaymentToFormerControllingShareholdersOfLoanFinancialCorporation" id="iboc_LossContingencyPaymentToFormerControllingShareholdersOfLoanFinancialCorporation" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="OperatingLeasesFutureMinimumPaymentsDueFutureMinimumSubleaseRentalsMinimumPeriod" id="iboc_OperatingLeasesFutureMinimumPaymentsDueFutureMinimumSubleaseRentalsMinimumPeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="CashReserveToSatisfyRegulatoryReserveRequirements" id="iboc_CashReserveToSatisfyRegulatoryReserveRequirements" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="IntangibleAssetsAndGoodwill" id="iboc_IntangibleAssetsAndGoodwill" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="AcquisitionsDisclosureAbstract" id="iboc_AcquisitionsDisclosureAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ScheduleOfOtherBorrowedFundsTableTextBlock" id="iboc_ScheduleOfOtherBorrowedFundsTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ProvisionAndAllowanceForProbableLoanLossesPolicyTextBlock" id="iboc_ProvisionAndAllowanceForProbableLoanLossesPolicyTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="LoansPolicyTextBlock" id="iboc_LoansPolicyTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="OtherRealEstateOwnedPolicyTextBlock" id="iboc_OtherRealEstateOwnedPolicyTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="OtherInvestmentsPolicyTextBlock" id="iboc_OtherInvestmentsPolicyTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ConsolidatedStatementsOfCashFlowsPolicyTextBlock" id="iboc_ConsolidatedStatementsOfCashFlowsPolicyTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ReclassificationsPolicyTextBlock" id="iboc_ReclassificationsPolicyTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ImpairedLoansPolicyTextBlock" id="iboc_ImpairedLoansPolicyTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NonAccrualLoansPolicyTextBlock" id="iboc_NonAccrualLoansPolicyTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DeferredTaxAssetsOtherRealEstateOwned" id="iboc_DeferredTaxAssetsOtherRealEstateOwned" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="FurnitureEquipmentAndVehiclesMember" id="iboc_FurnitureEquipmentAndVehiclesMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="LandBuildingFurnitureFixtureAndEquipmentMember" id="iboc_LandBuildingFurnitureFixtureAndEquipmentMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DepositsDisclosureAbstract" id="iboc_DepositsDisclosureAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ScheduleOfDepositsTableTextBlock" id="iboc_ScheduleOfDepositsTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ScheduleOfDepositsAndRelatedInterestExpenseTableTextBlock" id="iboc_ScheduleOfDepositsAndRelatedInterestExpenseTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ScheduleOfTimeDepositsContractualMaturitiesTableTextBlock" id="iboc_ScheduleOfTimeDepositsContractualMaturitiesTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ScheduleOfTimeDepositsWithBalancesOf100000OrMoreWithContractualMaturitiesTableTextBlock" id="iboc_ScheduleOfTimeDepositsWithBalancesOf100000OrMoreWithContractualMaturitiesTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="TimeDepositsLessThan100000Abstract" id="iboc_TimeDepositsLessThan100000Abstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="TimeDepositsLessThan100000Domestic" id="iboc_TimeDepositsLessThan100000Domestic" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="TimeDepositsLessThan100000Foreign" id="iboc_TimeDepositsLessThan100000Foreign" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="InterestExpenseNOWAccountsMoneyMarketAccountsAndSavingsDepositDomestic" id="iboc_InterestExpenseNOWAccountsMoneyMarketAccountsAndSavingsDepositDomestic" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="InterestExpenseNOWAccountsMoneyMarketAccountsAndSavingsDepositForeign" id="iboc_InterestExpenseNOWAccountsMoneyMarketAccountsAndSavingsDepositForeign" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="InterestExpenseTimeDeposits100000OrMoreAbstract" id="iboc_InterestExpenseTimeDeposits100000OrMoreAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="InterestExpenseTimeDeposits100000OrMoreDomestic" id="iboc_InterestExpenseTimeDeposits100000OrMoreDomestic" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="InterestExpenseTimeDeposits100000OrMoreForeign" id="iboc_InterestExpenseTimeDeposits100000OrMoreForeign" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="InterestExpenseTimeDepositsLessThan100000Abstract" id="iboc_InterestExpenseTimeDepositsLessThan100000Abstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="InterestExpenseTimeDepositsLessThan100000Domestic" id="iboc_InterestExpenseTimeDepositsLessThan100000Domestic" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="InterestExpenseTimeDepositsLessThan100000Foreign" id="iboc_InterestExpenseTimeDepositsLessThan100000Foreign" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="SecuritiesSoldUnderRepurchaseAgreementsDisclosureAbstract" id="iboc_SecuritiesSoldUnderRepurchaseAgreementsDisclosureAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="SecuritiesSoldUnderAgreementsToRepurchaseAverageOutstandingAmount" id="iboc_SecuritiesSoldUnderAgreementsToRepurchaseAverageOutstandingAmount" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="SecuritiesSoldUnderAgreementsToRepurchaseMaximumOutstandingAmountAtAnyMonthEnd" id="iboc_SecuritiesSoldUnderAgreementsToRepurchaseMaximumOutstandingAmountAtAnyMonthEnd" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="InternationalOperationsDisclosureAbstract" id="iboc_InternationalOperationsDisclosureAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ScheduleOfProductsOrServicesTable" id="iboc_ScheduleOfProductsOrServicesTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="InternationalBankingServicesMember" id="iboc_InternationalBankingServicesMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="InternationalOperationServicesLineItems" id="iboc_InternationalOperationServicesLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ScheduleOfAccountsNotesLoansAndFinancingReceivablesTableTextBlock" id="iboc_ScheduleOfAccountsNotesLoansAndFinancingReceivablesTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DeferredCompensationArrangementsWithIndividualRequisiteServicePeriod" id="iboc_DeferredCompensationArrangementsWithIndividualRequisiteServicePeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="IncomeTaxExpenseBenefitContinuingOperationsIncomeTaxReconciliationElementsAbstract" id="iboc_IncomeTaxExpenseBenefitContinuingOperationsIncomeTaxReconciliationElementsAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="IncomeTaxReconciliationNondeductibleExpenseLitigation" id="iboc_IncomeTaxReconciliationNondeductibleExpenseLitigation" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="IncomeTaxReconciliationNoninterestIncomeOther" id="iboc_IncomeTaxReconciliationNoninterestIncomeOther" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentMinimumNumberOfNonEmployeeBoardMembersToAuthorizeRSUs" id="iboc_ShareBasedCompensationArrangementByShareBasedPaymentMinimumNumberOfNonEmployeeBoardMembersToAuthorizeRSUs" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentageOfRSUToTotalCompensationLimit" id="iboc_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentageOfRSUToTotalCompensationLimit" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="InternationalBancsharesCorporationLongTermRestrictedStockUnitPlan2009Member" id="iboc_InternationalBancsharesCorporationLongTermRestrictedStockUnitPlan2009Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="CPPStatusAxis" id="iboc_CPPStatusAxis" type="xbrli:stringItemType" substitutionGroup="xbrldt:dimensionItem" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="CPPStatusDomain" id="iboc_CPPStatusDomain" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="CPPCompliantLongTermRSUMember" id="iboc_CPPCompliantLongTermRSUMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="CPPNonCompliantLongTermRSUMember" id="iboc_CPPNonCompliantLongTermRSUMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="FinancialInstrumentsWithOffStatementOfConditionRiskAndConcentrationsOfCreditRiskDisclosureAbstract" id="iboc_FinancialInstrumentsWithOffStatementOfConditionRiskAndConcentrationsOfCreditRiskDisclosureAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="CommercialLettersOfCreditMember" id="iboc_CommercialLettersOfCreditMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="UnsecuredLettersOfCreditMember" id="iboc_UnsecuredLettersOfCreditMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="CreditRiskCommitmentsExpirationDate" id="iboc_CreditRiskCommitmentsExpirationDate" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="FinancialInformationStatementsOfConditionDisclosureAbstract" id="iboc_FinancialInformationStatementsOfConditionDisclosureAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="CondensedStatementsOfConditionOfParentCompanyOnlyTableTextBlock" id="iboc_CondensedStatementsOfConditionOfParentCompanyOnlyTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="InvestmentInSubsidiaries" id="iboc_InvestmentInSubsidiaries" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="IntercompanyPayables" id="iboc_IntercompanyPayables" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="FinancialInformationStatementsOfIncomeDisclosureAbstract" id="iboc_FinancialInformationStatementsOfIncomeDisclosureAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="CondensedStatementsOfIncomeOfParentCompanyOnlyTableTextBlock" id="iboc_CondensedStatementsOfIncomeOfParentCompanyOnlyTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="IncomeAbstract" id="iboc_IncomeAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="InterestIncomeNotesReceivable" id="iboc_InterestIncomeNotesReceivable" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="TotalIncome" id="iboc_TotalIncome" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="DividendIncomeFromSubsidiaries" id="iboc_DividendIncomeFromSubsidiaries" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="ExpensesAbstract" id="iboc_ExpensesAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="TotalExpenses" id="iboc_TotalExpenses" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="IncomeLossFromContinuingOperationsAfterIncomeTaxesAndBeforeMinorityInterestIncomeLossFromEquityMethodInvestments" id="iboc_IncomeLossFromContinuingOperationsAfterIncomeTaxesAndBeforeMinorityInterestIncomeLossFromEquityMethodInvestments" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="IncomeLossFromInvestmentsInSubsidiaries" id="iboc_IncomeLossFromInvestmentsInSubsidiaries" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="FinancialInformationStatementsOfCashFlowsDisclosureAbstract" id="iboc_FinancialInformationStatementsOfCashFlowsDisclosureAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="CondensedStatementsOfCashFlowsParentCompanyOnlyTableTextBlock" id="iboc_CondensedStatementsOfCashFlowsParentCompanyOnlyTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="IncomeLossFromInvestmentsInSubsidiariesCashFlowAsAdjusted" id="iboc_IncomeLossFromInvestmentsInSubsidiariesCashFlowAsAdjusted" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="IncreaseDecreaseInOtherAssets" id="iboc_IncreaseDecreaseInOtherAssets" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringNetOfReclassificationAdjustment" id="iboc_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringNetOfReclassificationAdjustment" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="InternationalBankOfCommerceLaredoMember" id="iboc_InternationalBankOfCommerceLaredoMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="InternationalBankOfCommerceBrownsvilleMember" id="iboc_InternationalBankOfCommerceBrownsvilleMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="InternationalBankOfCommerceZapataMember" id="iboc_InternationalBankOfCommerceZapataMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="CommerceBankMember" id="iboc_CommerceBankMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="InternationalOperationsDisclosureTextBlock" id="iboc_InternationalOperationsDisclosureTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="FairValueOffBalanceSheetRisksAndConcentrationOfRiskTextBlock" id="iboc_FairValueOffBalanceSheetRisksAndConcentrationOfRiskTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="CondensedFinancialInformationOfConditionParentCompanyOnlyDisclosureTextBlock" id="iboc_CondensedFinancialInformationOfConditionParentCompanyOnlyDisclosureTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="CondensedFinancialInformationOfIncomeParentCompanyOnlyDisclosureTextBlock" id="iboc_CondensedFinancialInformationOfIncomeParentCompanyOnlyDisclosureTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="CondensedFinancialInformationOfCashFlowParentCompanyOnlyDisclosureTextBlock" id="iboc_CondensedFinancialInformationOfCashFlowParentCompanyOnlyDisclosureTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="LongTermRestrictedStockUnitsNoteAbstract" id="iboc_LongTermRestrictedStockUnitsNoteAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="LongTermRestrictedStockUnitsDisclosureTextBlock" id="iboc_LongTermRestrictedStockUnitsDisclosureTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NumberOfMaterialNonRecognizableEvent" id="iboc_NumberOfMaterialNonRecognizableEvent" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="AccruedDividendsPreferredStockValue" id="iboc_AccruedDividendsPreferredStockValue" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardExpirationPeriod" id="iboc_ShareBasedCompensationArrangementByShareBasedPaymentAwardExpirationPeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="FairValueByBalanceSheetGroupingSignificantAssumptionsAbstract1" id="iboc_FairValueByBalanceSheetGroupingSignificantAssumptionsAbstract1" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="PrepaymentPenaltyOnSecuritiesSoldUnderRepurchaseAgreement" id="iboc_PrepaymentPenaltyOnSecuritiesSoldUnderRepurchaseAgreement" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
</xsd:schema>
