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  <xs:element id="gbci_PeriodPastDueToConsiderLoansAsDelinquent" abstract="false" name="PeriodPastDueToConsiderLoansAsDelinquent" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="gbci_FinancingReceivableCreditQualityIndicators2TableTextBlock" abstract="false" name="FinancingReceivableCreditQualityIndicators2TableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <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_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedDeposits" abstract="false" name="BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedDeposits" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" 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_NonperformingFinancialInstruments3089DaysPastDueMember" abstract="true" name="NonperformingFinancialInstruments3089DaysPastDueMember" 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_MoodysAa1Aa2OrAa3RatingsMember" abstract="true" name="MoodysAa1Aa2OrAa3RatingsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gbci_CertifiedDevelopmentEntitiesMember" abstract="true" name="CertifiedDevelopmentEntitiesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gbci_InterestReceivableAvailableForSaleDebtSecurities" abstract="false" name="InterestReceivableAvailableForSaleDebtSecurities" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="gbci_StandardPoorsNotRatedMember" abstract="true" name="StandardPoorsNotRatedMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gbci_MiscellaneousLoanFeesAndCharges" abstract="false" name="MiscellaneousLoanFeesAndCharges" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" 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_StandardPoorsAAAAOrAARatingsMember" abstract="true" name="StandardPoorsAAAAOrAARatingsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gbci_EquitySecuritiesPolicyPolicyTextBlock" abstract="false" name="EquitySecuritiesPolicyPolicyTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="gbci_CashConsiderationForOutstandingShares" abstract="false" name="CashConsiderationForOutstandingShares" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="gbci_UnamortizedLoanOriginationCostsFees" abstract="false" name="UnamortizedLoanOriginationCostsFees" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="gbci_GainLossonSaleofLoansMember" abstract="true" name="GainLossonSaleofLoansMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gbci_InterestExpenseFederalHomeLoanBankAdvance" abstract="false" name="InterestExpenseFederalHomeLoanBankAdvance" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="gbci_UnamortizedDiscountsAndPremiumsOnLoans" abstract="false" name="UnamortizedDiscountsAndPremiumsOnLoans" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <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_VIEWriteDownsLossesAndOtherExpenses" abstract="false" name="VIEWriteDownsLossesAndOtherExpenses" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="gbci_PropertyPlantAndEquipmentAndLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization" abstract="false" name="PropertyPlantAndEquipmentAndLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="gbci_FinancingReceivableAllowanceForCreditLossesForecastingPeriod" abstract="false" name="FinancingReceivableAllowanceForCreditLossesForecastingPeriod" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <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_MaximumPeriodUpToWhichPurchasePriceOfBusinessIsAllocatedToAssetsAcquiredAndLiabilitiesAssumed" abstract="false" name="MaximumPeriodUpToWhichPurchasePriceOfBusinessIsAllocatedToAssetsAcquiredAndLiabilitiesAssumed" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="gbci_StandardPoorsAAOrARatingsMember" abstract="true" name="StandardPoorsAAOrARatingsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <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_GeneralInsuranceAndFederalDepositInsuranceCorporationPremiumExpense" abstract="false" name="GeneralInsuranceAndFederalDepositInsuranceCorporationPremiumExpense" 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_HomeEquityPortfolioSegmentMember" abstract="true" name="HomeEquityPortfolioSegmentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gbci_RealEstateAcquiredThroughForeclosureSecuredbyResidentialRealEstate" abstract="false" name="RealEstateAcquiredThroughForeclosureSecuredbyResidentialRealEstate" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="gbci_QualifiedAffordableHousingProjectInvestmentsMember" abstract="true" name="QualifiedAffordableHousingProjectInvestmentsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gbci_NonperformingFinancialInstrumentsNonAccrualAnd90DaysOrMorePastDueMember" abstract="true" name="NonperformingFinancialInstrumentsNonAccrualAnd90DaysOrMorePastDueMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <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_CollateralDependentLoans" abstract="false" name="CollateralDependentLoans" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="gbci_NumberOfBankDivisions" abstract="false" name="NumberOfBankDivisions" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="gbci_BusinessAssetsMember" abstract="true" name="BusinessAssetsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
</xs:schema>
