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  <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_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_PercentageOfConsolidatedStockholdersEquityExceedingWhichNoBorrowerHadOutstandingLoansOrCommitments" abstract="false" name="PercentageOfConsolidatedStockholdersEquityExceedingWhichNoBorrowerHadOutstandingLoansOrCommitments" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types1:percentItemType"/>
  <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_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_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-types:domainItemType"/>
  <xs:element id="gbci_FinancialAssetEqualToOrGreaterThan90DaysPastDueAndNonaccrualsMember" abstract="true" name="FinancialAssetEqualToOrGreaterThan90DaysPastDueAndNonaccrualsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gbci_RightOfUseAsset" abstract="false" name="RightOfUseAsset" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="gbci_OperatingLeaseRightOfUseAssetAbstract" abstract="true" name="OperatingLeaseRightOfUseAssetAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <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_InvestmentProgramProportionalAmortizationMethodAppliedIncomeTaxCreditAndOtherTaxBenefitAmortizationStatementOfIncomeOrComprehensiveIncomeExtensibleEnumerationNotDisclosedFlag" abstract="false" name="InvestmentProgramProportionalAmortizationMethodAppliedIncomeTaxCreditAndOtherTaxBenefitAmortizationStatementOfIncomeOrComprehensiveIncomeExtensibleEnumerationNotDisclosedFlag" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="gbci_DepositsTextualAbstract" abstract="true" name="DepositsTextualAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="gbci_TimeDepositsThatMeetOrExceedFDICInsuranceLimit" abstract="false" name="TimeDepositsThatMeetOrExceedFDICInsuranceLimit" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="gbci_OverdraftDemandDepositsReclassifiedAsLoans" abstract="false" name="OverdraftDemandDepositsReclassifiedAsLoans" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="gbci_FederalHomeLoanBankAdvancesMaturitiesSummaryAverageInterestRate" abstract="false" name="FederalHomeLoanBankAdvancesMaturitiesSummaryAverageInterestRate" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types1:percentItemType"/>
  <xs:element id="gbci_FirstCompanyStatutoryTrust2001Member" abstract="true" name="FirstCompanyStatutoryTrust2001Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="gbci_FirstCompanyStatutoryTrust2003Member" abstract="true" name="FirstCompanyStatutoryTrust2003Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="gbci_GlacierCapitalTrustIiMember" abstract="true" name="GlacierCapitalTrustIiMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="gbci_CitizensIdStatutoryTrustIMember" abstract="true" name="CitizensIdStatutoryTrustIMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="gbci_GlacierCapitalTrustIiiMember" abstract="true" name="GlacierCapitalTrustIiiMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="gbci_GlacierCapitalTrustIvMember" abstract="true" name="GlacierCapitalTrustIvMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="gbci_BankOfSanJuansBancorporationTrustIMember" abstract="true" name="BankOfSanJuansBancorporationTrustIMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="gbci_FNBUTStatutoryTrustIMemberMember" abstract="true" name="FNBUTStatutoryTrustIMemberMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="gbci_FNBUTStatutoryTrustIIMember" abstract="true" name="FNBUTStatutoryTrustIIMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="gbci_JuniorSubordinatedDebentureOwedtoUnconsolidatedSubsidiaryTrustMember" abstract="true" name="JuniorSubordinatedDebentureOwedtoUnconsolidatedSubsidiaryTrustMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="gbci_TermsOfSubordinatedDebenturesAbstract" abstract="true" name="TermsOfSubordinatedDebenturesAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="gbci_MaximumNumberOfConsecutiveQuartersForDeferralOfInterestPaymentsOnTrustPreferredSecurities" abstract="false" name="MaximumNumberOfConsecutiveQuartersForDeferralOfInterestPaymentsOnTrustPreferredSecurities" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="gbci_SizeOfCompanyEligibleForTier1GrandfatherProvision" abstract="false" name="SizeOfCompanyEligibleForTier1GrandfatherProvision" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="gbci_GlacierBankMember" abstract="true" name="GlacierBankMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="gbci_CapitalConservationBufferToRiskWeightedAssetsCurrentYear" abstract="false" name="CapitalConservationBufferToRiskWeightedAssetsCurrentYear" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types1:percentItemType"/>
  <xs:element id="gbci_TierOneCommonCapitalRequiredForCapitalAdequacyToRiskWeightedAssets" abstract="false" name="TierOneCommonCapitalRequiredForCapitalAdequacyToRiskWeightedAssets" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types1:percentItemType"/>
  <xs:element id="gbci_TierOneCommonCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets" abstract="false" name="TierOneCommonCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types1:percentItemType"/>
  <xs:element id="gbci_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTaxBenefit" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTaxBenefit" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="gbci_DefinedContributionPlanMember" abstract="true" name="DefinedContributionPlanMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="gbci_DeferredCompensationPlanMember" abstract="true" name="DeferredCompensationPlanMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="gbci_DeferredCompensationPlanAcquiredMember" abstract="true" name="DeferredCompensationPlanAcquiredMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="gbci_SupplementalEmployeeRetirementPlansMember" abstract="true" name="SupplementalEmployeeRetirementPlansMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="gbci_RetirementPlanEmployeeAgeAxis" abstract="true" name="RetirementPlanEmployeeAgeAxis" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType"/>
  <xs:element id="gbci_RetirementPlanEmployeeAgeDomain" abstract="true" name="RetirementPlanEmployeeAgeDomain" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="gbci_EmployeeAgeUnder50Member" abstract="true" name="EmployeeAgeUnder50Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="gbci_EmployeeAge50andOverMember" abstract="true" name="EmployeeAge50andOverMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="gbci_MinimumAgeRequiredToBeConsideredEligibleForPlan" abstract="false" name="MinimumAgeRequiredToBeConsideredEligibleForPlan" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="gbci_PeriodOfEmploymentRequiredToBeEligibleForPlan" abstract="false" name="PeriodOfEmploymentRequiredToBeEligibleForPlan" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="gbci_MinimumNumberOfQuartersRequiredToBeEligibleForEmployerDiscretionaryContribution" abstract="false" name="MinimumNumberOfQuartersRequiredToBeEligibleForEmployerDiscretionaryContribution" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="gbci_MinimumNumberOfHoursRequiredToBeConsideredEligibleForEmployerDiscretionaryContribution" abstract="false" name="MinimumNumberOfHoursRequiredToBeConsideredEligibleForEmployerDiscretionaryContribution" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="gbci_DefinedContributionPlanAgeOfEmployee" abstract="false" name="DefinedContributionPlanAgeOfEmployee" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="gbci_PercentageOfEmployeesContributionRequiredToDetermineMatchedAmountUnderPlan" abstract="false" name="PercentageOfEmployeesContributionRequiredToDetermineMatchedAmountUnderPlan" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:percentItemType"/>
  <xs:element id="gbci_PercentageOfSalaryForDeferralOfCashPayments" abstract="false" name="PercentageOfSalaryForDeferralOfCashPayments" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:percentItemType"/>
  <xs:element id="gbci_PercentageOfBonusesAndDirectorsFeesForDeferralOfCashPayments" abstract="false" name="PercentageOfBonusesAndDirectorsFeesForDeferralOfCashPayments" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:percentItemType"/>
  <xs:element id="gbci_CreditEarningRateAsPercentageOfReturnOnEquity" abstract="false" name="CreditEarningRateAsPercentageOfReturnOnEquity" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:percentItemType"/>
  <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_LoanRelatedExpenses" abstract="false" name="LoanRelatedExpenses" 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_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_DepositRelatedExpenses" abstract="false" name="DepositRelatedExpenses" 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_DeferredTaxAssetsOperatingLeaseLiabilities" abstract="false" name="DeferredTaxAssetsOperatingLeaseLiabilities" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="gbci_DeferredTaxAssetDebtSecuritiesAvailableForSaleTransferred" abstract="false" name="DeferredTaxAssetDebtSecuritiesAvailableForSaleTransferred" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="gbci_DeferredTaxLiabilitiesOperatingLeaseROUAssets" abstract="false" name="DeferredTaxLiabilitiesOperatingLeaseROUAssets" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="gbci_OperatingLossandTaxCreditCarryforwardsTable" abstract="true" name="OperatingLossandTaxCreditCarryforwardsTable" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType"/>
  <xs:element id="gbci_OperatingLossandTaxCreditCarryforwardsLineItems" abstract="true" name="OperatingLossandTaxCreditCarryforwardsLineItems" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="gbci_AOCIAccumulatedGainLossDebtSecuritiesAvailableForSaleGainsAndTransfersIncludedInNetIncomeAndAccumulatedGainLossNetCashFlowHedgeParentMember" abstract="true" name="AOCIAccumulatedGainLossDebtSecuritiesAvailableForSaleGainsAndTransfersIncludedInNetIncomeAndAccumulatedGainLossNetCashFlowHedgeParentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="gbci_AOCIAccumulatedGainLossDebtSecuritiesAvailableForSaleGainsAndTransfersIncludedInNetIncomeParentMember" abstract="true" name="AOCIAccumulatedGainLossDebtSecuritiesAvailableForSaleGainsAndTransfersIncludedInNetIncomeParentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="gbci_AOCIAccumulatedGainLossDebtSecuritiesAvailableForSaleAmortizationIncludedInNetIncomeParentMember" abstract="true" name="AOCIAccumulatedGainLossDebtSecuritiesAvailableForSaleAmortizationIncludedInNetIncomeParentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="gbci_StatementOfOperationsAbstract" abstract="true" name="StatementOfOperationsAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="gbci_IntercompanyChargesForServices" abstract="false" name="IntercompanyChargesForServices" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="gbci_EarningsBeforeIncomeTaxBenefitAndEquityInUndistributedEarningsOfSubsidiaries" abstract="false" name="EarningsBeforeIncomeTaxBenefitAndEquityInUndistributedEarningsOfSubsidiaries" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="gbci_IncomeBeforeEquityInUndistributedEarningsOfSubsidiaries" abstract="false" name="IncomeBeforeEquityInUndistributedEarningsOfSubsidiaries" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="gbci_SubsidiaryIncomeInExcessOfLessThanDividendsDistributed" abstract="false" name="SubsidiaryIncomeInExcessOfLessThanDividendsDistributed" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="gbci_PaymentsForProceedsFromNonMarketableEquitySecurities" abstract="false" name="PaymentsForProceedsFromNonMarketableEquitySecurities" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="gbci_ProceedsFromSubsidiariesPaymentsToAcquireAdditionalInterestInSubsidiaries" abstract="false" name="ProceedsFromSubsidiariesPaymentsToAcquireAdditionalInterestInSubsidiaries" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <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_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_ToBeAnnouncedHedgeMember" abstract="true" name="ToBeAnnouncedHedgeMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gbci_OtherRealEstateOwnedFairValueDisclosure" abstract="false" name="OtherRealEstateOwnedFairValueDisclosure" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <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_FinancialAssetsFairValueDisclosure" abstract="false" name="FinancialAssetsFairValueDisclosure" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="gbci_CommitmenttoExtendCreditMember" abstract="true" name="CommitmenttoExtendCreditMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="gbci_LettersofCreditMember" abstract="true" name="LettersofCreditMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="gbci_CommunityFinancialGroupInc.Member" abstract="true" name="CommunityFinancialGroupInc.Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gbci_RockyMountainBankDivisionOfHTLFBankMember" abstract="true" name="RockyMountainBankDivisionOfHTLFBankMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gbci_BusinessCombinationNumberOfBranchLocationsAcquired" abstract="false" name="BusinessCombinationNumberOfBranchLocationsAcquired" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="gbci_BusinessCombinationConsiderationTransferredDepositPremium" abstract="false" name="BusinessCombinationConsiderationTransferredDepositPremium" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="gbci_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeposits" abstract="false" name="BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeposits" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="gbci_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLoansReceivableGross" abstract="false" name="BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLoansReceivableGross" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="gbci_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedMarketableSecurities" abstract="false" name="BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedMarketableSecurities" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="gbci_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAccruedIncomeAndOtherAssets" abstract="false" name="BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAccruedIncomeAndOtherAssets" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="gbci_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBorrowings" abstract="false" name="BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBorrowings" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="gbci_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAccruedExpensesAndOtherLiabilities" abstract="false" name="BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAccruedExpensesAndOtherLiabilities" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="gbci_CommunityFinancialGroupInc.AndRockyMountainBankDivisionOfHTLFBankMember" abstract="true" name="CommunityFinancialGroupInc.AndRockyMountainBankDivisionOfHTLFBankMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gbci_BankOfIdahoMember" abstract="true" name="BankOfIdahoMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gbci_NumberOfBranchLocations1" abstract="false" name="NumberOfBranchLocations1" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
</xs:schema>
