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  <xsd:element abstract="true" id="isba_FederalHomeLoanBankAdvancesFixedRateDue2024MemberMember" name="FederalHomeLoanBankAdvancesFixedRateDue2024MemberMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="isba_FederalHomeLoanBankAdvancesFixedRateDue2026Member" name="FederalHomeLoanBankAdvancesFixedRateDue2026Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="isba_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresMaturityPeriod" name="FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresMaturityPeriod" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="isba_FederalHomeLoanBankAdvancesVariableRateDue2021MemberMemberMember" name="FederalHomeLoanBankAdvancesVariableRateDue2021MemberMemberMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="isba_FinancingReceivableAllowanceForCreditLossesHistoricalLossAllocationAnalysisPeriod" name="FinancingReceivableAllowanceForCreditLossesHistoricalLossAllocationAnalysisPeriod" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration" />
  <xsd:element id="isba_FinancingReceivableAmountAdditionalApprovalThreshold" name="FinancingReceivableAmountAdditionalApprovalThreshold" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="isba_FinancingReceivableContinuingPerformanceAccrualOfInterestThresholdPeriod" name="FinancingReceivableContinuingPerformanceAccrualOfInterestThresholdPeriod" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration" />
  <xsd:element id="isba_FinancingReceivableCreditQualityDelinquencyPeriod" name="FinancingReceivableCreditQualityDelinquencyPeriod" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration" />
  <xsd:element id="isba_FinancingReceivableDebtServicingToGrossIncomeRatioMaximum" name="FinancingReceivableDebtServicingToGrossIncomeRatioMaximum" nillable="true" substitutionGroup="xbrli:item" type="xbrli:pureItemType" xbrli:periodType="duration" />
  <xsd:element id="isba_FinancingReceivableLoanToValueRatioMaximum" name="FinancingReceivableLoanToValueRatioMaximum" nillable="true" substitutionGroup="xbrli:item" type="xbrli:pureItemType" xbrli:periodType="duration" />
  <xsd:element id="isba_FinancingReceivableNonperformingNonaccrualOfInterestThresholdPeriod" name="FinancingReceivableNonperformingNonaccrualOfInterestThresholdPeriod" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration" />
  <xsd:element id="isba_FinancingReceivablePaymentAmountToGrossIncomeRatioMaximum" name="FinancingReceivablePaymentAmountToGrossIncomeRatioMaximum" nillable="true" substitutionGroup="xbrli:item" type="xbrli:pureItemType" xbrli:periodType="duration" />
  <xsd:element id="isba_FinancingReceivableRecordedInvestmentPastDueAndNonaccrualStatus" name="FinancingReceivableRecordedInvestmentPastDueAndNonaccrualStatus" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="isba_FinancingReceivableTerm" name="FinancingReceivableTerm" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="isba_HighQualityRatingMember" name="HighQualityRatingMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="isba_HighSatisfactoryRatingMember" name="HighSatisfactoryRatingMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="isba_ImpairedFinancingReceivableFairValueDisclosure" name="ImpairedFinancingReceivableFairValueDisclosure" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="isba_ImpairedFinancingReceivableFairValueDisclosureAppraisedValueDiscount" name="ImpairedFinancingReceivableFairValueDisclosureAppraisedValueDiscount" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="duration" />
  <xsd:element id="isba_ImpairedFinancingReceivableFairValueDisclosureAppraisedValueWeightedAverage" name="ImpairedFinancingReceivableFairValueDisclosureAppraisedValueWeightedAverage" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="duration" />
  <xsd:element id="isba_IncomeBeforeEquityInUndistributedNetIncomeOfSubsidiary" name="IncomeBeforeEquityInUndistributedNetIncomeOfSubsidiary" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="isba_IncomeLossBeforeIncomeTaxesandEquityinUndistributedNetIncomeofSubsidiary" name="IncomeLossBeforeIncomeTaxesandEquityinUndistributedNetIncomeofSubsidiary" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="isba_IncreaseDecreaseinInterestPayableAndOtherAccruedLiabilities" name="IncreaseDecreaseinInterestPayableAndOtherAccruedLiabilities" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="isba_InterestAndDividendIncomeSecuritiesOperatingAvailableforsaleTaxExempt" name="InterestAndDividendIncomeSecuritiesOperatingAvailableforsaleTaxExempt" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="isba_InterestAndDividendIncomeSecuritiesOperatingAvailableforsaleTaxable" name="InterestAndDividendIncomeSecuritiesOperatingAvailableforsaleTaxable" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="isba_InterestIncomeFederalFundsSoldAndOther" name="InterestIncomeFederalFundsSoldAndOther" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="isba_InterestPayableAndOtherLiabilities" name="InterestPayableAndOtherLiabilities" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="isba_InterestPayableFairValueDisclosure" name="InterestPayableFairValueDisclosure" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="isba_InterestReceivableFairValueDisclosure" name="InterestReceivableFairValueDisclosure" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="isba_LoansReceivableAllowanceFairValueDisclosure" name="LoansReceivableAllowanceFairValueDisclosure" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="isba_LoansReceivableCollateralizedByAccountsReceivableMember" name="LoansReceivableCollateralizedByAccountsReceivableMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="isba_LoansReceivableCollateralizedByCashCropInventoryMember" name="LoansReceivableCollateralizedByCashCropInventoryMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="isba_LoansReceivableCollateralizedByEquipmentMember" name="LoansReceivableCollateralizedByEquipmentMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="isba_LoansReceivableCollateralizedByLiquorLicenseMember" name="LoansReceivableCollateralizedByLiquorLicenseMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="isba_LoansReceivableCollateralizedByLivestockMember" name="LoansReceivableCollateralizedByLivestockMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="isba_LoansReceivableCollateralizedByOtherInventoryMember" name="LoansReceivableCollateralizedByOtherInventoryMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="isba_LoansReceivableCollateralizedByRealEstateMember" name="LoansReceivableCollateralizedByRealEstateMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="isba_LoansReceivableGrossAgriculturalandAgriculturalRealEstate" name="LoansReceivableGrossAgriculturalandAgriculturalRealEstate" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="isba_LoansReceivableGrossFairValueDisclosure" name="LoansReceivableGrossFairValueDisclosure" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="isba_LoansandLeasesReceivableGrossCommercialExcludingAgriculturalandAgriculturalRealEstate" name="LoansandLeasesReceivableGrossCommercialExcludingAgriculturalandAgriculturalRealEstate" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="isba_LossMember" name="LossMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="isba_LowSatisfactoryRatingMember" name="LowSatisfactoryRatingMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="isba_ManagementFeesAndOtherIncome" name="ManagementFeesAndOtherIncome" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="isba_MembershipsandSubscriptionsExpense" name="MembershipsandSubscriptionsExpense" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="isba_NoninterestIncomeInvestmentandTrustAdvisoryFees" name="NoninterestIncomeInvestmentandTrustAdvisoryFees" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="isba_NoninterestIncomeServiceChargesandFees" name="NoninterestIncomeServiceChargesandFees" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="isba_OtherMortgageServicingRightsFairValueDisclosure" name="OtherMortgageServicingRightsFairValueDisclosure" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="isba_OtherNoninterestExpenseMiscellaneous" name="OtherNoninterestExpenseMiscellaneous" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="isba_OtherRealEstateForeclosedAssetsandRepossessedAssetsValuationAdjustments" name="OtherRealEstateForeclosedAssetsandRepossessedAssetsValuationAdjustments" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="isba_PaymentsForProceedsFromLoanAndLeaseOriginationsAndPrincipalCollections" name="PaymentsForProceedsFromLoanAndLeaseOriginationsAndPrincipalCollections" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="isba_PaymentsForRepurchaseOfCommonStockExcludingStockForDeferredCompensationObligations" name="PaymentsForRepurchaseOfCommonStockExcludingStockForDeferredCompensationObligations" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="isba_PaymentsForRepurchaseOfCommonStockForDeferredCompensationObligations" name="PaymentsForRepurchaseOfCommonStockForDeferredCompensationObligations" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="isba_PercentageOfAssetsAndLiabilitiesMeasuredAtFairValue" name="PercentageOfAssetsAndLiabilitiesMeasuredAtFairValue" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="instant" />
  <xsd:element id="isba_PercentageOfReportableSegmentAssetsAndOperatingResults" name="PercentageOfReportableSegmentAssetsAndOperatingResults" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="instant" />
  <xsd:element id="isba_PledgedFinancialInstrumentsAvailableforSaleSecuritieswithoutSingleMaturityDate" name="PledgedFinancialInstrumentsAvailableforSaleSecuritieswithoutSingleMaturityDate" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="isba_PledgedFinancialInstrumentsNotSeparatelyReportedSecuritiesAndLoansReceivableForFederalHomeLoanBankDebtAndFederalReserveBankDiscountWindow" name="PledgedFinancialInstrumentsNotSeparatelyReportedSecuritiesAndLoansReceivableForFederalHomeLoanBankDebtAndFederalReserveBankDiscountWindow" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="isba_PledgedFinancialInstrumentsNotSeparatelyReportedSecuritiesAndLoansReceivablePledgedAsCollateral" name="PledgedFinancialInstrumentsNotSeparatelyReportedSecuritiesAndLoansReceivablePledgedAsCollateral" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="isba_Printingandsuppliesexpense" name="Printingandsuppliesexpense" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="isba_RealEstateOwnedMember" name="RealEstateOwnedMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="isba_ResidentialHomeEquityLineOfCreditFinancingReceivableMember" name="ResidentialHomeEquityLineOfCreditFinancingReceivableMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="isba_ResidentialJuniorLiensFinancingReceivableMember" name="ResidentialJuniorLiensFinancingReceivableMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="isba_ResidentialPrivatelyInsuredFinancingReceivableMember" name="ResidentialPrivatelyInsuredFinancingReceivableMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="isba_ResidentialSeniorLiensFinancingReceivableMember" name="ResidentialSeniorLiensFinancingReceivableMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="isba_RestructureOfLoansThroughForbearanceOfPrincipalOrAccruedInterest" name="RestructureOfLoansThroughForbearanceOfPrincipalOrAccruedInterest" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="isba_ScheduleofDebtLineItems" name="ScheduleofDebtLineItems" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="isba_ScheduleofDebtTable" name="ScheduleofDebtTable" nillable="true" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="isba_ScheduleofEquityMethodAndOtherInvestmentsTableTextBlock" name="ScheduleofEquityMethodAndOtherInvestmentsTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="isba_ServiceChargesAndDepositAccountFeesMember" name="ServiceChargesAndDepositAccountFeesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="isba_ShareBasedCompensationSharesTransferredFromTrustToCommonStockValue" name="ShareBasedCompensationSharesTransferredFromTrustToCommonStockValue" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="isba_ShortTermDebtWeightedAverageInterestRates" name="ShortTermDebtWeightedAverageInterestRates" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="isba_StateandLocalFundsPurchasedMember" name="StateandLocalFundsPurchasedMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="isba_StockRepurchasedDuringPeriodExcludingStockForDeferredCompensationObligationsShares" name="StockRepurchasedDuringPeriodExcludingStockForDeferredCompensationObligationsShares" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" xbrli:periodType="duration" />
  <xsd:element id="isba_StockRepurchasedDuringPeriodExcludingStockForDeferredCompensationObligationsValue" name="StockRepurchasedDuringPeriodExcludingStockForDeferredCompensationObligationsValue" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="isba_StockRepurchasedDuringPeriodForDeferredCompensationObligationsValue" name="StockRepurchasedDuringPeriodForDeferredCompensationObligationsValue" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="isba_SummaryOfOtherNoninterestExpensesAbstract" name="SummaryOfOtherNoninterestExpensesAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="isba_UndistributedEarningsOfEquityMethodAndOtherInvestments" name="UndistributedEarningsOfEquityMethodAndOtherInvestments" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="isba_VulnerableRatingMember" name="VulnerableRatingMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
</xsd:schema>
