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  <xs:element id="gbci_SecuritiesGrossUnrealizedGainAccumulatedInInvestments" abstract="false" name="SecuritiesGrossUnrealizedGainAccumulatedInInvestments" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="gbci_SecuritiesGrossUnrealizedLossAccumulatedInInvestments" abstract="false" name="SecuritiesGrossUnrealizedLossAccumulatedInInvestments" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="gbci_DebtSecuritiesFairValue" abstract="false" name="DebtSecuritiesFairValue" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="gbci_ProceedsFromSalesAndCallsOfDebtSecuritiesAvailableForSale" abstract="false" name="ProceedsFromSalesAndCallsOfDebtSecuritiesAvailableForSale" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="gbci_HeldtoMaturitySecuritiesGrossRealizedGainsLossesSaleProceeds" abstract="false" name="HeldtoMaturitySecuritiesGrossRealizedGainsLossesSaleProceeds" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="gbci_HeldtoMaturitySecuritiesSoldSecurityRealizedGain" abstract="false" name="HeldtoMaturitySecuritiesSoldSecurityRealizedGain" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="gbci_HeldtoMaturitySecuritiesSoldSecurityRealizedLoss" abstract="false" name="HeldtoMaturitySecuritiesSoldSecurityRealizedLoss" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="gbci_NumberOfCreditRatingCategoriesHighest" abstract="false" name="NumberOfCreditRatingCategoriesHighest" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="gbci_StandardPoorsAAAAOrAARatingsMember" abstract="true" name="StandardPoorsAAAAOrAARatingsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="gbci_StandardPoorsAAOrARatingsMember" abstract="true" name="StandardPoorsAAOrARatingsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="gbci_StandardPoorsNotRatedMember" abstract="true" name="StandardPoorsNotRatedMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="gbci_MoodysAa1Aa2OrAa3RatingsMember" abstract="true" name="MoodysAa1Aa2OrAa3RatingsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="gbci_MoodysA1A2OrA3RatingsMember" abstract="true" name="MoodysA1A2OrA3RatingsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="gbci_MoodysNotRatedMember" abstract="true" name="MoodysNotRatedMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="gbci_HomeEquityPortfolioSegmentMember" abstract="true" name="HomeEquityPortfolioSegmentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="gbci_WheatlandAndRMBMember" abstract="true" name="WheatlandAndRMBMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gbci_FinancingReceivableNonaccrualWithAllowance" abstract="false" name="FinancingReceivableNonaccrualWithAllowance" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="gbci_FinancingReceivableRepaymentThroughOperationOrSaleOfCollateralTable" abstract="true" name="FinancingReceivableRepaymentThroughOperationOrSaleOfCollateralTable" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType"/>
  <xs:element id="gbci_BusinessAssetsMember" abstract="true" name="BusinessAssetsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="gbci_OtherMember" abstract="true" name="OtherMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="gbci_CollateralDependentLoansLineItems" abstract="true" name="CollateralDependentLoansLineItems" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="gbci_PaymentDeferralAndExtendedMaturityMember" abstract="true" name="PaymentDeferralAndExtendedMaturityMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gbci_FinancialAsset30To89DaysPastDueMember" abstract="true" name="FinancialAsset30To89DaysPastDueMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="gbci_NonperformingFinancialInstruments3089DaysPastDueMember" abstract="true" name="NonperformingFinancialInstruments3089DaysPastDueMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="gbci_NonperformingFinancialInstrumentsNonAccrualAnd90DaysOrMorePastDueMember" abstract="true" name="NonperformingFinancialInstrumentsNonAccrualAnd90DaysOrMorePastDueMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="gbci_CertifiedDevelopmentEntitiesMember" abstract="true" name="CertifiedDevelopmentEntitiesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="gbci_TaxCreditPeriod" abstract="false" name="TaxCreditPeriod" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="gbci_TaxCreditCompliancePeriod" abstract="false" name="TaxCreditCompliancePeriod" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="gbci_InvestmentProportionalAmortizationMethodElectedStatementOfFinancialPositionExtensibleEnumerationNotDisclosedFlag" abstract="false" name="InvestmentProportionalAmortizationMethodElectedStatementOfFinancialPositionExtensibleEnumerationNotDisclosedFlag" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="gbci_QualifiedAffordableHousingProjectInvestmentsMember" abstract="true" name="QualifiedAffordableHousingProjectInvestmentsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="gbci_OtherCommitmentToBePaidAfterYearFour" abstract="false" name="OtherCommitmentToBePaidAfterYearFour" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="gbci_InvestmentProgramProportionalAmortizationMethodAppliedIncomeTaxCreditAndOtherTaxBenefitAmortizationStatementOfIncomeOrComprehensiveIncomeExtensibleEnumerationNotDisclosedFlag" abstract="false" name="InvestmentProgramProportionalAmortizationMethodAppliedIncomeTaxCreditAndOtherTaxBenefitAmortizationStatementOfIncomeOrComprehensiveIncomeExtensibleEnumerationNotDisclosedFlag" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="gbci_ConsultingFees" abstract="false" name="ConsultingFees" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="gbci_DebitCardExpense" abstract="false" name="DebitCardExpense" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="gbci_VIEWriteDownsLossesAndOtherExpenses" abstract="false" name="VIEWriteDownsLossesAndOtherExpenses" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="gbci_LoanRelatedExpenses" abstract="false" name="LoanRelatedExpenses" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="gbci_MiscellaneousEmployeeExpenses" abstract="false" name="MiscellaneousEmployeeExpenses" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="gbci_TelephoneExpenses" abstract="false" name="TelephoneExpenses" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="gbci_AccountingFees" abstract="false" name="AccountingFees" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="gbci_DepositRelatedExpenses" abstract="false" name="DepositRelatedExpenses" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="gbci_AOCIAccumulatedGainLossDebtSecuritiesAvailableForSaleGainsAndTransfersIncludedInNetIncomeAndAccumulatedGainLossNetCashFlowHedgeParentMember" abstract="true" name="AOCIAccumulatedGainLossDebtSecuritiesAvailableForSaleGainsAndTransfersIncludedInNetIncomeAndAccumulatedGainLossNetCashFlowHedgeParentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gbci_AOCIAccumulatedGainLossDebtSecuritiesAvailableForSaleGainsAndTransfersIncludedInNetIncomeParentMember" abstract="true" name="AOCIAccumulatedGainLossDebtSecuritiesAvailableForSaleGainsAndTransfersIncludedInNetIncomeParentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gbci_AOCIAccumulatedGainLossDebtSecuritiesAvailableForSaleAmortizationIncludedInNetIncomeParentMember" abstract="true" name="AOCIAccumulatedGainLossDebtSecuritiesAvailableForSaleAmortizationIncludedInNetIncomeParentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gbci_LoansHeldForSaleMember" abstract="true" name="LoansHeldForSaleMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="gbci_GainLossonSaleofLoansMember" abstract="true" name="GainLossonSaleofLoansMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="gbci_FairValueMeasurementTransfersFromOneLevelToAnother" abstract="false" name="FairValueMeasurementTransfersFromOneLevelToAnother" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="gbci_ToBeAnnouncedHedgeMember" abstract="true" name="ToBeAnnouncedHedgeMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gbci_CollateralDependentImpairedLoansOwnedFairValueDisclosure" abstract="false" name="CollateralDependentImpairedLoansOwnedFairValueDisclosure" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="gbci_CombinedApproachValuationTechniqueMember" abstract="true" name="CombinedApproachValuationTechniqueMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="gbci_ImpairedLoansMeasurementInput" abstract="false" name="ImpairedLoansMeasurementInput" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:decimalItemType"/>
  <xs:element id="gbci_HeldToMaturityInvestmentsFairValueDisclosure" abstract="false" name="HeldToMaturityInvestmentsFairValueDisclosure" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="gbci_FinancialAssetsFairValueDisclosure" abstract="false" name="FinancialAssetsFairValueDisclosure" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="gbci_BankOfIdahoMember" abstract="true" name="BankOfIdahoMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
</xs:schema>
