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  <xsd:element id="colb_CondensedStatementsOfCashFlowsParentCompanyTableTextBlock" name="CondensedStatementsOfCashFlowsParentCompanyTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element id="colb_CondensedStatementsOfIncomeParentCompanyTableTextBlock" name="CondensedStatementsOfIncomeParentCompanyTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element id="colb_CoreAndOtherDeposits" name="CoreAndOtherDeposits" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="colb_CoreDeposits" name="CoreDeposits" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="colb_DataprocessingMember" name="DataprocessingMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="colb_DebtInstrumentActivityForYearTableTextBlock" name="DebtInstrumentActivityForYearTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="colb_DebtInstrumentsTable" name="DebtInstrumentsTable" nillable="true" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="colb_DeferredCompensationArrangementWithIndividualBenefitPeriod" name="DeferredCompensationArrangementWithIndividualBenefitPeriod" nillable="true" substitutionGroup="xbrli:item" type="us-types:durationStringItemType" xbrli:periodType="duration" />
  <xsd:element id="colb_DeferredCompensationArrangementWithIndividualContributionRequirementsMatchingPercent" name="DeferredCompensationArrangementWithIndividualContributionRequirementsMatchingPercent" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="instant" />
  <xsd:element id="colb_DeferredCompensationArrangementWithIndividualContributionRequirementsPercentOfEachEmployeeCompensation" name="DeferredCompensationArrangementWithIndividualContributionRequirementsPercentOfEachEmployeeCompensation" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="instant" />
  <xsd:element id="colb_DeferredCompensationArrangementWithIndividualContributionToPlanByEmployeePercentOfEligibleCompensation" name="DeferredCompensationArrangementWithIndividualContributionToPlanByEmployeePercentOfEligibleCompensation" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="instant" />
  <xsd:element id="colb_DeferredCompensationArrangementWithIndividualEligibleAge" name="DeferredCompensationArrangementWithIndividualEligibleAge" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="instant" />
  <xsd:element id="colb_DeferredCompensationArrangementWithIndividualVestingPeriod" name="DeferredCompensationArrangementWithIndividualVestingPeriod" nillable="true" substitutionGroup="xbrli:item" type="us-types:durationStringItemType" xbrli:periodType="duration" />
  <xsd:element id="colb_DeferredTaxAssetOtherRealEstateOwnedCosts" name="DeferredTaxAssetOtherRealEstateOwnedCosts" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="colb_DeferredTaxLiabilitiesAssetPurchaseTaxBasisDifference" name="DeferredTaxLiabilitiesAssetPurchaseTaxBasisDifference" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="colb_DeferredTaxLiabilitiesStockDividends" name="DeferredTaxLiabilitiesStockDividends" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="colb_Deferredtaxliabilitiespurchaseaccounting" name="Deferredtaxliabilitiespurchaseaccounting" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="colb_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationAnnualCostOfLivingBenefitAdjustment" name="DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationAnnualCostOfLivingBenefitAdjustment" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="instant" />
  <xsd:element id="colb_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationNormalRetirementAge" name="DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationNormalRetirementAge" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="instant" />
  <xsd:element id="colb_DefinedBenefitPlanExpectedFutureBenefitPayments" name="DefinedBenefitPlanExpectedFutureBenefitPayments" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="colb_Depositaccountandtreasurymanagementfees" name="Depositaccountandtreasurymanagementfees" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="colb_DepositsValuationAdjustmentFromAcquisitionAccounting" name="DepositsValuationAdjustmentFromAcquisitionAccounting" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="colb_DerivativeAssetsGrossAmountsOffsetintheBalanceSheets" name="DerivativeAssetsGrossAmountsOffsetintheBalanceSheets" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="colb_DerivativeLiabilityGrossAmountsOffsetinBalanceSheets" name="DerivativeLiabilityGrossAmountsOffsetinBalanceSheets" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="colb_DiscountOnCommonStockUnderEmployeeStockPurchasePlanPercent" name="DiscountOnCommonStockUnderEmployeeStockPurchasePlanPercent" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="colb_DocumentAndEntityInformationAbstract" name="DocumentAndEntityInformationAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="colb_Earningsallocatedtoparticipatingsecuritiesnonvestedrestrictedshares" name="Earningsallocatedtoparticipatingsecuritiesnonvestedrestrictedshares" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="colb_Earningsallocatedtoparticipatingsecuritiespreferredshares" name="Earningsallocatedtoparticipatingsecuritiespreferredshares" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="colb_EffectiveIncomeTaxRateReconciliationLifeInsuranceProceeds" name="EffectiveIncomeTaxRateReconciliationLifeInsuranceProceeds" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="duration" />
  <xsd:element id="colb_Effectiveincometaxratereconciliationnondeductibleexpensebusinesscombinationamount" name="Effectiveincometaxratereconciliationnondeductibleexpensebusinesscombinationamount" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="colb_Effectiveincometaxratereconciliationnondeductibleexpensebusinesscombinationpercent" name="Effectiveincometaxratereconciliationnondeductibleexpensebusinesscombinationpercent" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="colb_EmployeeBenefitAxis" name="EmployeeBenefitAxis" nillable="true" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="colb_EmployeeBenefitDomain" name="EmployeeBenefitDomain" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="colb_EmployeeBenefitLineItems" name="EmployeeBenefitLineItems" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="colb_ExpectedchangeinotherassetsduetoadoptionofnewASU" name="ExpectedchangeinotherassetsduetoadoptionofnewASU" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="colb_ExpectedchangeinotherliabilitiesduetoadoptionofnewASU" name="ExpectedchangeinotherliabilitiesduetoadoptionofnewASU" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="colb_ExpenseAbstract" name="ExpenseAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="colb_FDIClosssharingagreementearlyterminationpretaxcharge" name="FDIClosssharingagreementearlyterminationpretaxcharge" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="colb_FHLBmembershipstockpurchaserequirementcap" name="FHLBmembershipstockpurchaserequirementcap" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="colb_FederalHomeLoanBankAdvancesMaturitiesSummaryAverageInterestRateAfterTenYearsFromBalanceSheetDate" name="FederalHomeLoanBankAdvancesMaturitiesSummaryAverageInterestRateAfterTenYearsFromBalanceSheetDate" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="instant" />
  <xsd:element id="colb_FederalHomeLoanBankAdvancesMaturitiesSummaryAverageInterestRateOneToFiveYearsFromBalanceSheetDate" name="FederalHomeLoanBankAdvancesMaturitiesSummaryAverageInterestRateOneToFiveYearsFromBalanceSheetDate" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="instant" />
  <xsd:element id="colb_FederalHomeLoanBankAdvancesMaturitiesSummaryByInterestRateTypeFixedRateAfterTenYears" name="FederalHomeLoanBankAdvancesMaturitiesSummaryByInterestRateTypeFixedRateAfterTenYears" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="colb_FederalHomeLoanBankAdvancesMaturitiesSummaryByInterestRateTypeFixedRateBeforeValuationAdjustment" name="FederalHomeLoanBankAdvancesMaturitiesSummaryByInterestRateTypeFixedRateBeforeValuationAdjustment" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="colb_FederalHomeLoanBankAndFederalReserveBankBorrowingsAbstract" name="FederalHomeLoanBankAndFederalReserveBankBorrowingsAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="colb_FederalHomeLoanBankAndFederalReserveBankBorrowingsTextBlock" name="FederalHomeLoanBankAndFederalReserveBankBorrowingsTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element id="colb_FederalHomeLoanBankFixedRateAdvancesValuationAdjustmentFromAcquisitionAccounting" name="FederalHomeLoanBankFixedRateAdvancesValuationAdjustmentFromAcquisitionAccounting" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="colb_FederalHomeLoanBankStockPolicyTextBlock" name="FederalHomeLoanBankStockPolicyTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element id="colb_FederalHomeLoanBankstockparvalue" name="FederalHomeLoanBankstockparvalue" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="colb_FederalReserveBankAdvancesActivityForYearAbstract" name="FederalReserveBankAdvancesActivityForYearAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="colb_FederalReserveBankAdvancesActivityfortheyearaveragebalanceofagreementsoutstanding" name="FederalReserveBankAdvancesActivityfortheyearaveragebalanceofagreementsoutstanding" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="colb_FederalReserveBankAdvancesMaximumAmountAvailable" name="FederalReserveBankAdvancesMaximumAmountAvailable" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="colb_FederalReserveBankMember" name="FederalReserveBankMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="colb_Federalincometaxrate2018" name="Federalincometaxrate2018" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="duration" />
  <xsd:element id="colb_Federaloperatinglosscarryforwardssettobegintoexpirein2024" name="Federaloperatinglosscarryforwardssettobegintoexpirein2024" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="colb_Financialservicesandtrustrevenue" name="Financialservicesandtrustrevenue" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="colb_FinancingReceivableModificationsAdditionalCommitmentToLend" name="FinancingReceivableModificationsAdditionalCommitmentToLend" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="colb_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruingNumberOfLoans" name="FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruingNumberOfLoans" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="instant" />
  <xsd:element id="colb_FinancingReceivableRecordedInvestmentGrossNonaccrualStatus" name="FinancingReceivableRecordedInvestmentGrossNonaccrualStatus" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="colb_FinancingReceivableUnpaidPrincipalBalanceNonaccrualStatus" name="FinancingReceivableUnpaidPrincipalBalanceNonaccrualStatus" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="colb_Gainonsaleofmerchantcardservicesportfolio" name="Gainonsaleofmerchantcardservicesportfolio" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="colb_GoodwillAndIntangibleAssetsLineItems" name="GoodwillAndIntangibleAssetsLineItems" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="colb_GoodwillAndIntangibleAssetsRollForward" name="GoodwillAndIntangibleAssetsRollForward" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="colb_GoodwillAndIntangibleAssetsTable" name="GoodwillAndIntangibleAssetsTable" nillable="true" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="colb_GoodwillAndIntangibleAssetsTotal" name="GoodwillAndIntangibleAssetsTotal" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="colb_Idahostateoperatinglosscarryforwardssettobegintoexpirein2024" name="Idahostateoperatinglosscarryforwardssettobegintoexpirein2024" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="colb_ImpairedFinancingReceivableWithAllowanceAxis" name="ImpairedFinancingReceivableWithAllowanceAxis" nillable="true" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="colb_ImpairedFinancingReceivableWithAllowanceDomain" name="ImpairedFinancingReceivableWithAllowanceDomain" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="colb_ImpairedFinancingReceivableWithoutRelatedAllowanceAxis" name="ImpairedFinancingReceivableWithoutRelatedAllowanceAxis" nillable="true" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="colb_ImpairedFinancingReceivableWithoutRelatedAllowanceDomain" name="ImpairedFinancingReceivableWithoutRelatedAllowanceDomain" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="colb_ImpairedLoansFinancialAssetsFairValue" name="ImpairedLoansFinancialAssetsFairValue" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="colb_ImpairedLoansMeasurementInput" name="ImpairedLoansMeasurementInput" nillable="true" substitutionGroup="xbrli:item" type="xbrli:decimalItemType" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="colb_ImpairedLoansMember" name="ImpairedLoansMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="colb_ImpairedLoansWithRecordedAllowanceMember" name="ImpairedLoansWithRecordedAllowanceMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="colb_ImpairedLoansWithoutRecordedAllowanceMember" name="ImpairedLoansWithoutRecordedAllowanceMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="colb_IncomeAbstract" name="IncomeAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="colb_IncomeLossBeforeEquityInUndistributedNetIncomeLossOfSubsidiaries" name="IncomeLossBeforeEquityInUndistributedNetIncomeLossOfSubsidiaries" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="colb_IncomePropertyMultifamilyConstructionMember" name="IncomePropertyMultifamilyConstructionMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="colb_IncomePropertyMultifamilyMember" name="IncomePropertyMultifamilyMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="colb_IncomeTaxReconciliationLifeInsuranceProceeds" name="IncomeTaxReconciliationLifeInsuranceProceeds" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="colb_IntermountainCommunityBancorpMember" name="IntermountainCommunityBancorpMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="colb_IssuancesOfSecuritiesExceedingShareholdersEquityThresholdPercent" name="IssuancesOfSecuritiesExceedingShareholdersEquityThresholdPercent" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="colb_JuniorsubordinateddebenturesAbstract" name="JuniorsubordinateddebenturesAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="colb_JuniorsubordinateddebenturesLineItems" name="JuniorsubordinateddebenturesLineItems" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="colb_JuniorsubordinateddebenturesTable" name="JuniorsubordinateddebenturesTable" nillable="true" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="colb_JuniorsubordinateddebenturesTextBlock" name="JuniorsubordinateddebenturesTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="colb_LandAndAcquisitionMember" name="LandAndAcquisitionMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="colb_LegalandprofessionalfeesMember" name="LegalandprofessionalfeesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="colb_LoanAndLeaseLossesGeneralAllocation" name="LoanAndLeaseLossesGeneralAllocation" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="colb_LoanAndLeaseLossesSpecificReserve" name="LoanAndLeaseLossesSpecificReserve" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="colb_Loanrevenue" name="Loanrevenue" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="colb_LoansAnalysisofPurchasedCreditImpairedLoansAccretableYieldRollforwardAbstract" name="LoansAnalysisofPurchasedCreditImpairedLoansAccretableYieldRollforwardAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="colb_LoansAndLeasesReceivableLoansEvaluatedForImpairmentOnQuarterlyBasisOutstanding" name="LoansAndLeasesReceivableLoansEvaluatedForImpairmentOnQuarterlyBasisOutstanding" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="colb_LoansAndLeasesReceivableNonaccrualLoansConsideredImpaired" name="LoansAndLeasesReceivableNonaccrualLoansConsideredImpaired" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="colb_LoansAndLeasesReceivableNonaccrualOfInterestCommitmentsOfAdditionalFunds" name="LoansAndLeasesReceivableNonaccrualOfInterestCommitmentsOfAdditionalFunds" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="colb_LoansByMajorCategoryAxis" name="LoansByMajorCategoryAxis" nillable="true" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="colb_LoansByMajorCategoryDomain" name="LoansByMajorCategoryDomain" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="colb_LoansExcludingPurchasedCreditImpairedLoansMember" name="LoansExcludingPurchasedCreditImpairedLoansMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="colb_LoansReceivableRealEstateConstruction" name="LoansReceivableRealEstateConstruction" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="colb_LoansReceivableRealEstateMortgage" name="LoansReceivableRealEstateMortgage" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="colb_LoanspledgedtocollateralizeFederalHomeLoanBankAdvances" name="LoanspledgedtocollateralizeFederalHomeLoanBankAdvances" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="colb_LoanspledgedtocollateralizeFederalReserveBankBorrowings" name="LoanspledgedtocollateralizeFederalReserveBankBorrowings" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="colb_LookBackPeriodUnderEmployeeStockPurchasePlan" name="LookBackPeriodUnderEmployeeStockPurchasePlan" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration" />
  <xsd:element id="colb_MerchantProcessing" name="MerchantProcessing" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="colb_Merchantprocessingrevenue" name="Merchantprocessingrevenue" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="colb_Netcostbenefitofoperationofotherrealestateowned" name="Netcostbenefitofoperationofotherrealestateowned" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="colb_NetgainonsaleandvaluationadjustmentsofOREO" name="NetgainonsaleandvaluationadjustmentsofOREO" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="colb_Noninterestincomeexcludingrevenuefromcontractswithcustomers" name="Noninterestincomeexcludingrevenuefromcontractswithcustomers" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="colb_NotCollateralDependentMember" name="NotCollateralDependentMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="colb_NumberOfBranchLocations" name="NumberOfBranchLocations" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="instant" />
  <xsd:element id="colb_NumberOfDaysUsedToDetermineTreatmentAsCashEquivalent" name="NumberOfDaysUsedToDetermineTreatmentAsCashEquivalent" nillable="true" substitutionGroup="xbrli:item" type="us-types:durationStringItemType" xbrli:periodType="duration" />
  <xsd:element id="colb_NumberOfIssuancesOfSecuritiesExceedingShareholdersEquityThreshold" name="NumberOfIssuancesOfSecuritiesExceedingShareholdersEquityThreshold" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="instant" />
  <xsd:element id="colb_NumberOfLookBackPeriodUnderEmployeeStockPurchasePlan" name="NumberOfLookBackPeriodUnderEmployeeStockPurchasePlan" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="duration" />
  <xsd:element id="colb_NumberOfSecuritiesInContinuousLossPositionForTwelveMonthsOrMore" name="NumberOfSecuritiesInContinuousLossPositionForTwelveMonthsOrMore" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="instant" />
  <xsd:element id="colb_NumberOfSecuritiesInUnrealizedLossPosition" name="NumberOfSecuritiesInUnrealizedLossPosition" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="instant" />
  <xsd:element id="colb_NumberofDaysofDelinquencyatWhichLoansAreCategorizedAsNonAccrualStatus" name="NumberofDaysofDelinquencyatWhichLoansAreCategorizedAsNonAccrualStatus" nillable="true" substitutionGroup="xbrli:item" type="us-types:durationStringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="colb_OneToFourFamilyResidentialMember" name="OneToFourFamilyResidentialMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="colb_OnetoFourFamilyResidentialConstructionDomain" name="OnetoFourFamilyResidentialConstructionDomain" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="colb_Oregonstateoperatinglosscarryforwardssettobegintoexpirein2024" name="Oregonstateoperatinglosscarryforwardssettobegintoexpirein2024" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="colb_OtherRealEstateOwnedFairValue" name="OtherRealEstateOwnedFairValue" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="colb_OtherRealEstateOwnedFairValueDisclosure" name="OtherRealEstateOwnedFairValueDisclosure" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="colb_OtherRealEstateOwnedLineItems" name="OtherRealEstateOwnedLineItems" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="colb_OtherRealEstateOwnedMember" name="OtherRealEstateOwnedMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="colb_OtherRealEstateOwnedTable" name="OtherRealEstateOwnedTable" nillable="true" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="colb_OtherRealEstateOwnedestablishedthroughacquisition" name="OtherRealEstateOwnedestablishedthroughacquisition" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="colb_OtherSecuritiesMember" name="OtherSecuritiesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="colb_OtherSubsidiariesMember" name="OtherSubsidiariesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="colb_Otherbrokeredcertificatesofdeposit" name="Otherbrokeredcertificatesofdeposit" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="colb_OthernoninterestexpensesMember" name="OthernoninterestexpensesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="colb_OwnerOccupiedConstructionMember" name="OwnerOccupiedConstructionMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="colb_OwnerOccupiedMember" name="OwnerOccupiedMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="colb_PacificContinentalMember" name="PacificContinentalMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="colb_PaymentfromtoFDICtoterminatelosssharingagreements" name="PaymentfromtoFDICtoterminatelosssharingagreements" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="colb_PaymenttoFDICRelatedtoLossSharingAsset" name="PaymenttoFDICRelatedtoLossSharingAsset" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="colb_ProceedsFromSalesOfLoansHeldForInvestmentAndOtherAssets" name="ProceedsFromSalesOfLoansHeldForInvestmentAndOtherAssets" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="colb_ProceedsfromFDICforreimbursementonlosssharingasset" name="ProceedsfromFDICforreimbursementonlosssharingasset" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="colb_Proceedsfromsaleofmerchantcardservicesportfolio" name="Proceedsfromsaleofmerchantcardservicesportfolio" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="colb_PurchasedCreditImpairedLoansMember" name="PurchasedCreditImpairedLoansMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="colb_RealEstateAcquiredThroughForeclosureTransfersInNetOfWriteDowns" name="RealEstateAcquiredThroughForeclosureTransfersInNetOfWriteDowns" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="colb_RealEstateConstructionPortfolioSegmentMember" name="RealEstateConstructionPortfolioSegmentMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="colb_RealEstateOwnedByTypeAxis" name="RealEstateOwnedByTypeAxis" nillable="true" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="colb_RealEstateOwnedTypeDomain" name="RealEstateOwnedTypeDomain" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="colb_RealEstatePortfolioSegmentMember" name="RealEstatePortfolioSegmentMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="colb_ReceivableByCollateralTypeAxis" name="ReceivableByCollateralTypeAxis" nillable="true" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="colb_ReceivableByCollateralTypeDomain" name="ReceivableByCollateralTypeDomain" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="colb_ReceivablesPurchasedCreditImpairedLoansAbstract" name="ReceivablesPurchasedCreditImpairedLoansAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="colb_RecentdevelopmentsAxis" name="RecentdevelopmentsAxis" nillable="true" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="colb_RecentdevelopmentsDomain" name="RecentdevelopmentsDomain" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="colb_Repaymentoftermrepurchaseagreement" name="Repaymentoftermrepurchaseagreement" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="colb_RepurchaseAgreementsSweepMember" name="RepurchaseAgreementsSweepMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="colb_Repurchaseagreementsamountsoffsetinbalancesheet" name="Repurchaseagreementsamountsoffsetinbalancesheet" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="colb_Repurchaseagreementsnetamountpresentedinstatementoffinancialposition" name="Repurchaseagreementsnetamountpresentedinstatementoffinancialposition" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="colb_ResidentialConstructionMember" name="ResidentialConstructionMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="colb_Revenuefromcontractswithcustomers" name="Revenuefromcontractswithcustomers" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="colb_ScheduleOfContractualMaturitiesTextBlock" name="ScheduleOfContractualMaturitiesTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element id="colb_ScheduleOfDepositsTableTextBlock" name="ScheduleOfDepositsTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element id="colb_ScheduleOfGrossUnrealizedLossesAndFairValuesOfSecuritiesInContinuousUnrealizedLossPositionTextBlock" name="ScheduleOfGrossUnrealizedLossesAndFairValuesOfSecuritiesInContinuousUnrealizedLossPositionTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element id="colb_ScheduleOfTimeDepositsMaturityTableTextBlock" name="ScheduleOfTimeDepositsMaturityTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element id="colb_ScheduleofSecuritiespledgedascollateralTableTextBlock" name="ScheduleofSecuritiespledgedascollateralTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element id="colb_ScheduleofgrossrealizedgainsandlossesonsalesandcallsofsecuritiesavailableforsaleTableTextBlock" name="ScheduleofgrossrealizedgainsandlossesonsalesandcallsofsecuritiesavailableforsaleTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="colb_SecuredLoansMember" name="SecuredLoansMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="colb_SecuritiesPledgedAsCollateralByCounterpartyAxis" name="SecuritiesPledgedAsCollateralByCounterpartyAxis" nillable="true" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="colb_SecuritiesPledgedAsCollateralByCounterpartyDomain" name="SecuritiesPledgedAsCollateralByCounterpartyDomain" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="colb_Securitiessoldunderagreementstorepurchaseamountnotoffset" name="Securitiessoldunderagreementstorepurchaseamountnotoffset" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="colb_ShareBasedCompensationArrangementByShareBasedPaymentAwardExercisablePeriod" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardExercisablePeriod" nillable="true" substitutionGroup="xbrli:item" type="us-types:durationStringItemType" xbrli:periodType="duration" />
  <xsd:element id="colb_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumTerm" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumTerm" nillable="true" substitutionGroup="xbrli:item" type="us-types:durationStringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="colb_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeAbstract" name="ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="colb_SharebasedCompensationSharesAuthorizedunderStockOptionPlansExercisePriceRangeFrom0.00To9.99Member" name="SharebasedCompensationSharesAuthorizedunderStockOptionPlansExercisePriceRangeFrom0.00To9.99Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="colb_SharebasedCompensationSharesAuthorizedunderStockOptionPlansExercisePriceRangeFrom40.00To49.99MemberMember" name="SharebasedCompensationSharesAuthorizedunderStockOptionPlansExercisePriceRangeFrom40.00To49.99MemberMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="colb_SharebasedCompensationSharesAuthorizedunderStockOptionPlansExercisePriceRangeFrom50.00To136.93Member" name="SharebasedCompensationSharesAuthorizedunderStockOptionPlansExercisePriceRangeFrom50.00To136.93Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="colb_SharesAvailableForPurchaseUnderEmployeeStockPurchasePlan" name="SharesAvailableForPurchaseUnderEmployeeStockPurchasePlan" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="colb_StateofsaleleasebackactivityAxis" name="StateofsaleleasebackactivityAxis" nillable="true" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="colb_StateofsaleleasebackactivityDomain" name="StateofsaleleasebackactivityDomain" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="colb_StockAdjustmentValueDeferredCompensation" name="StockAdjustmentValueDeferredCompensation" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="colb_SubordinateddebenturesAbstract" name="SubordinateddebenturesAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="colb_SummaryofOtherRealEstateOwnedTableTextBlock" name="SummaryofOtherRealEstateOwnedTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element id="colb_TaxesLicensesAndFees" name="TaxesLicensesAndFees" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="colb_TaxeslicensesandfeesMember" name="TaxeslicensesandfeesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="colb_TierOneBasedCapitalRequiredforCapitalAdequacytoRiskWeightedAssetspluscapitalconservationbufferfullyphasedin" name="TierOneBasedCapitalRequiredforCapitalAdequacytoRiskWeightedAssetspluscapitalconservationbufferfullyphasedin" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="instant" />
  <xsd:element id="colb_TierOneBasedCapitalRequiredforCapitalAdequacytoRiskWeightedAssetspluscapitalconservationbufferphasein" name="TierOneBasedCapitalRequiredforCapitalAdequacytoRiskWeightedAssetspluscapitalconservationbufferphasein" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="instant" />
  <xsd:element id="colb_TierOneRiskBasedCapitalRequiredforCapitalAdequacypluscapitalconservationbufferfullyphasedin" name="TierOneRiskBasedCapitalRequiredforCapitalAdequacypluscapitalconservationbufferfullyphasedin" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="colb_TierOneRiskBasedCapitalRequiredforCapitalAdequacypluscapitalconservationbufferphasein" name="TierOneRiskBasedCapitalRequiredforCapitalAdequacypluscapitalconservationbufferphasein" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="colb_TransferOtherRealEstateWriteDown" name="TransferOtherRealEstateWriteDown" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="colb_USGovernmentAgencyAndGovernmentSponsoredEnterpriseMortgageBackedSecuritiesAndCollateralizedMortgageObligationsMember" name="USGovernmentAgencyAndGovernmentSponsoredEnterpriseMortgageBackedSecuritiesAndCollateralizedMortgageObligationsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="colb_UnrealizedgainsandlossesonequitysecuritiesTableTextBlock" name="UnrealizedgainsandlossesonequitysecuritiesTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="colb_UnsecuredLoansMember" name="UnsecuredLoansMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="colb_WashingtonAndOregonStatePublicDepositsMember" name="WashingtonAndOregonStatePublicDepositsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
</xsd:schema>
