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        <link:definition>01020 - Disclosure - SUPPLEMENTARY FINANCIAL INFORMATION (Details)</link:definition>
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  <element name="UnrecognizedTaxBenefitsDecreasesIncreasesResultingFromPriorPeriodTaxPositions" id="cass_UnrecognizedTaxBenefitsDecreasesIncreasesResultingFromPriorPeriodTaxPositions" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" xbrli:balance="credit"/>
  <element name="FrostNationalBankMember" id="cass_FrostNationalBankMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <element name="JpmChaseBankMember" id="cass_JpmChaseBankMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <element name="GatewayGivingLLCMember" id="cass_GatewayGivingLLCMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <element name="IncomeTaxReconciliationReconcilingItemsAbstract" id="cass_IncomeTaxReconciliationReconcilingItemsAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
  <element name="WeightedAverageInterestRateOfInterestBearingDeposits" id="cass_WeightedAverageInterestRateOfInterestBearingDeposits" type="num:percentItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="instant"/>
  <element name="ScheduleOfMaturitiesOfTimeDepositsTableTextBlock" id="cass_ScheduleOfMaturitiesOfTimeDepositsTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <element name="AccountsAndDraftsPayableFairValueDisclosure" id="cass_AccountsAndDraftsPayableFairValueDisclosure" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="instant" xbrli:balance="credit"/>
  <element name="ScheduleOfInterestExpenseOnDepositsTableTextBlock" id="cass_ScheduleOfInterestExpenseOnDepositsTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <element name="DeferredTaxLiabilitiesStockCompensation" id="cass_DeferredTaxLiabilitiesStockCompensation" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="instant" xbrli:balance="credit"/>
  <element name="OtherFinancingReceivableMember" id="cass_OtherFinancingReceivableMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <element name="EmergingMarketsMember" id="cass_EmergingMarketsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <element name="PercentageHoldingRequiredToAccountInvestmentsNonMarketableEquityInvestments" id="cass_PercentageHoldingRequiredToAccountInvestmentsNonMarketableEquityInvestments" type="num:percentItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="instant"/>
  <element name="WeighteDaverageInterestRateOfTimeDepositsLessThan100000" id="cass_WeighteDaverageInterestRateOfTimeDepositsLessThan100000" type="num:percentItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="instant"/>
  <element name="UnitedStatesCoreOpportunisticMember" id="cass_UnitedStatesCoreOpportunisticMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <element name="PercentageOfTargetOpportunityForAwardsToVest" id="cass_PercentageOfTargetOpportunityForAwardsToVest" type="num:percentItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <element name="ProfitSharingExpenseRecognizedInConsolidatedStatementsOfIncome" id="cass_ProfitSharingExpenseRecognizedInConsolidatedStatementsOfIncome" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" xbrli:balance="credit"/>
  <element name="InterestOnFederalFundsSoldAndOtherShortTermInvestments" id="cass_InterestOnFederalFundsSoldAndOtherShortTermInvestments" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" xbrli:balance="credit"/>
  <element name="CommonEquityTierOneRiskBasedCapitalRequiredToBeWellCapitalized" id="cass_CommonEquityTierOneRiskBasedCapitalRequiredToBeWellCapitalized" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="instant" xbrli:balance="credit"/>
  <element name="InterestExpenseTimeDeposits100000OrMoreAndLessThan250000" id="cass_InterestExpenseTimeDeposits100000OrMoreAndLessThan250000" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" xbrli:balance="debit"/>
  <element name="RealEstateChurchRelatedConstructionLoanMember" id="cass_RealEstateChurchRelatedConstructionLoanMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <element name="PercentageOfOneTimeCharge" id="cass_PercentageOfOneTimeCharge" type="num:percentItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <element name="NetOperatingLossCarryforwardsLimitationsOnUse" id="cass_NetOperatingLossCarryforwardsLimitationsOnUse" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="instant" xbrli:balance="debit"/>
  <element name="ForeignEquitySecuritiesEmergingMember" id="cass_ForeignEquitySecuritiesEmergingMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <element name="NoncontributoryProfitSharingProgramMember" id="cass_NoncontributoryProfitSharingProgramMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <element name="ExpensesAbstract" id="cass_ExpensesAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
  <element name="RealEstateCommercialMortgageMember" id="cass_RealEstateCommercialMortgageMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <element name="RealEstateFaithBasedRelatedMortgageMember" id="cass_RealEstateFaithBasedRelatedMortgageMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <element name="FeeRevenueAndOtherIncomeRevenueFromCustomers" id="cass_FeeRevenueAndOtherIncomeRevenueFromCustomers" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" xbrli:balance="credit"/>
  <element name="IndustrialRevenueBondsMember" id="cass_IndustrialRevenueBondsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <element name="IncomeBeforeUndistributedIncomeOfSubsidiaries" id="cass_IncomeBeforeUndistributedIncomeOfSubsidiaries" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" xbrli:balance="credit"/>
  <element name="ScheduleOfInterestBearingDepositsTableTextBlock" id="cass_ScheduleOfInterestBearingDepositsTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <element name="CommonEquityTierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets" id="cass_CommonEquityTierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets" type="num:percentItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="instant"/>
  <element name="WellsFargoBankMember" id="cass_WellsFargoBankMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <element name="ScheduleOfProjectedBenefitObligationAssetsFundedStatusAndAmountsRecognizedTableTextBlock" id="cass_ScheduleOfProjectedBenefitObligationAssetsFundedStatusAndAmountsRecognizedTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <element name="ImpairmentOfLoansPolicyPolicyTextBlock" id="cass_ImpairmentOfLoansPolicyPolicyTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <element name="TransactionTwoMember" id="cass_TransactionTwoMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <element name="ScheduleOfNetPeriodicPensionCostsTableTextBlock" id="cass_ScheduleOfNetPeriodicPensionCostsTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <element name="TransactionOneMember" id="cass_TransactionOneMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <element name="ScheduleOfDefinedBenefitPlanAccumulatedOtherComprehensiveIncomeLossPretaxTableTextBlock" id="cass_ScheduleOfDefinedBenefitPlanAccumulatedOtherComprehensiveIncomeLossPretaxTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <element name="InvestmentInDebtSecuritiesPolicyTextBlock" id="cass_InvestmentInDebtSecuritiesPolicyTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <element name="IncentiveStockOptionsExercised" id="cass_IncentiveStockOptionsExercised" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <element name="OutsideServiceFees" id="cass_OutsideServiceFees" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" xbrli:balance="debit"/>
  <element name="LoansSubjectToNormalMonitoringMember" id="cass_LoansSubjectToNormalMonitoringMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <element name="OneYearNominalReturn" id="cass_OneYearNominalReturn" type="num:percentItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <element name="IncreaseDecreaseInPaymentsInExcessOfFunding" id="cass_IncreaseDecreaseInPaymentsInExcessOfFunding" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" xbrli:balance="credit"/>
  <element name="PerformanceBasedRestrictedSharesMember" id="cass_PerformanceBasedRestrictedSharesMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <element name="ScheduleOfLoanCategoriesTableTextBlock" id="cass_ScheduleOfLoanCategoriesTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <element name="UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitationsOver12Months" id="cass_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitationsOver12Months" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" xbrli:balance="debit"/>
  <element name="ExpectedLongTermRateReturn" id="cass_ExpectedLongTermRateReturn" type="num:percentItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <element name="IncomeRecognizedOnNonaccrualLoans" id="cass_IncomeRecognizedOnNonaccrualLoans" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" xbrli:balance="credit"/>
  <element name="CommercialAndIndustrialLoanMember" id="cass_CommercialAndIndustrialLoanMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <element name="ProceedsFromPurchaseOfStateAndPoliticalSubdivisions" id="cass_ProceedsFromPurchaseOfStateAndPoliticalSubdivisions" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="instant" xbrli:balance="debit"/>
  <element name="CommercialLettersOfCreditMember" id="cass_CommercialLettersOfCreditMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <element name="RealEstateCommercialConstructionLoanMember" id="cass_RealEstateCommercialConstructionLoanMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <element name="IncomeTaxesTable" id="cass_IncomeTaxesTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" abstract="true" nillable="true" xbrli:periodType="duration"/>
  <element name="OpportunisticMember" id="cass_OpportunisticMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <element name="TreasuryStockPolicyPolicyTextBlock" id="cass_TreasuryStockPolicyPolicyTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <element name="AdditionalOperatingLeaseRightOfUseAsset" id="cass_AdditionalOperatingLeaseRightOfUseAsset" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="instant" xbrli:balance="debit"/>
  <element name="ReductionOfTaxExpense" id="cass_ReductionOfTaxExpense" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" xbrli:balance="debit"/>
  <element name="AssetsAndLiabilitiesExpectedToBeAddedToBalanceSheetFromAdoptionOfASU" id="cass_AssetsAndLiabilitiesExpectedToBeAddedToBalanceSheetFromAdoptionOfASU" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="instant" xbrli:balance="debit"/>
  <element name="ForeignEquitySecuritiesMember" id="cass_ForeignEquitySecuritiesMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <element name="UnitedStatesPassiveMember" id="cass_UnitedStatesPassiveMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <element name="IncomeTaxesLineItems" id="cass_IncomeTaxesLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
  <element name="CassInformationSystemsIncMember" id="cass_CassInformationSystemsIncMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <element name="InvoicePaymentFeesInscopeFASBASC606" id="cass_InvoicePaymentFeesInscopeFASBASC606" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" xbrli:balance="credit"/>
  <element name="AvailableForSaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosurePercentage" id="cass_AvailableForSaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosurePercentage" type="num:percentItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="instant"/>
  <element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAndStockAppreciationRightsExercisesInPeriod" id="cass_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAndStockAppreciationRightsExercisesInPeriod" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <element name="CreditExposureOfLoanPortfolioDomain" id="cass_CreditExposureOfLoanPortfolioDomain" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
  <element name="RealEstateFaithBasedConstructionLoanMember" id="cass_RealEstateFaithBasedConstructionLoanMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <element name="UmbBankMember" id="cass_UmbBankMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <element name="SupplementalExecutiveRetirementPlanMember" id="cass_SupplementalExecutiveRetirementPlanMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <element name="TaxEquivalentAdjustment" id="cass_TaxEquivalentAdjustment" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" xbrli:balance="debit"/>
  <element name="InterestExpenseTimeDeposits250000OrMore" id="cass_InterestExpenseTimeDeposits250000OrMore" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" xbrli:balance="debit"/>
  <element name="OtherLoanMember" id="cass_OtherLoanMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <element name="CommonEquityTierOneRiskBasedCapitalToRiskWeightedAssets" id="cass_CommonEquityTierOneRiskBasedCapitalToRiskWeightedAssets" type="num:percentItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="instant"/>
  <element name="OtherIncomeOutofscopeFASBASC606" id="cass_OtherIncomeOutofscopeFASBASC606" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" xbrli:balance="credit"/>
  <element name="BankingServicesMember" id="cass_BankingServicesMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <element name="NonperformingLoansSubjectToSpecialMonitoringMember" id="cass_NonperformingLoansSubjectToSpecialMonitoringMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <element name="InformationServicesMember" id="cass_InformationServicesMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <element name="UnitedStatesLargeCapGrowthMember" id="cass_UnitedStatesLargeCapGrowthMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <element name="FederalFundsSoldAndOtherShortTermInvestments" id="cass_FederalFundsSoldAndOtherShortTermInvestments" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="instant" xbrli:balance="debit"/>
  <element name="DefinedBenefitPlanFairValueOfPlanAssetsAbstract" id="cass_DefinedBenefitPlanFairValueOfPlanAssetsAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
  <element name="UsBankMember" id="cass_UsBankMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <element name="IncomeRecognizedOnNonaccrualLoansUnderOriginalTermsOfContract" id="cass_IncomeRecognizedOnNonaccrualLoansUnderOriginalTermsOfContract" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" xbrli:balance="credit"/>
  <element name="DocumentAndEntityInformationAbstract" id="cass_DocumentAndEntityInformationAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
  <element name="UnitedStatesSmallAndMidCapGrowthMember" id="cass_UnitedStatesSmallAndMidCapGrowthMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <element name="FirstTennesseeBankMember" id="cass_FirstTennesseeBankMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <element name="InformationServicesPaymentAndProcessingRevenue" id="cass_InformationServicesPaymentAndProcessingRevenue" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" xbrli:balance="credit"/>
  <element name="PaymentsInExcessOfFunding" id="cass_PaymentsInExcessOfFunding" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="instant" xbrli:balance="debit"/>
  <element name="CommonEquityTierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets" id="cass_CommonEquityTierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets" type="num:percentItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="instant"/>
  <element name="FundingSources" id="cass_FundingSources" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="instant" xbrli:balance="debit"/>
  <element name="InformationServicesRevenuePolicyTextBlock" id="cass_InformationServicesRevenuePolicyTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <element name="LiabilitiesCarryingValue" id="cass_LiabilitiesCarryingValue" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="instant" xbrli:balance="credit"/>
  <element name="ScheduleOfAssumedLongTermRateOfReturnOnAssetsTableTextBlock" id="cass_ScheduleOfAssumedLongTermRateOfReturnOnAssetsTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <element name="ScheduleOfFairValueOfPlanAssetsByTypeOfAssetsTableTextBlock" id="cass_ScheduleOfFairValueOfPlanAssetsByTypeOfAssetsTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <element name="PncBankMember" id="cass_PncBankMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <element name="FederalHomeLoanBankMember" id="cass_FederalHomeLoanBankMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <element name="PeriodForExpectedFutureBenefitsPayable" id="cass_PeriodForExpectedFutureBenefitsPayable" type="xbrli:durationItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <element name="EquitySecuritiesSmallCapMember" id="cass_EquitySecuritiesSmallCapMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <element name="NetInterestIncomeAfterProvisionForLoanLossesOutofscopeFASBASC606" id="cass_NetInterestIncomeAfterProvisionForLoanLossesOutofscopeFASBASC606" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" xbrli:balance="credit"/>
  <element name="InvoiceProcessingFeesInscopeFASBASC606" id="cass_InvoiceProcessingFeesInscopeFASBASC606" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" xbrli:balance="credit"/>
  <element name="FeeRevenueAndOtherIncomeIntersegmentIncomeExpense" id="cass_FeeRevenueAndOtherIncomeIntersegmentIncomeExpense" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" xbrli:balance="credit"/>
  <element name="ScheduleOfDefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostTableTextBlock" id="cass_ScheduleOfDefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <element name="CreditExposureOfLoanPortfolioAxis" id="cass_CreditExposureOfLoanPortfolioAxis" type="xbrli:stringItemType" substitutionGroup="xbrldt:dimensionItem" abstract="true" nillable="true" xbrli:periodType="duration"/>
  <element name="LongTermRateOfReturnAssumption" id="cass_LongTermRateOfReturnAssumption" type="num:percentItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <element name="InterestBearingDepositsAbstract" id="cass_InterestBearingDepositsAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
  <element name="EstimatedEarnoutAmount" id="cass_EstimatedEarnoutAmount" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" xbrli:balance="credit"/>
  <element name="AssetsCarryingAmount" id="cass_AssetsCarryingAmount" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="instant" xbrli:balance="debit"/>
  <element name="FranklinBancorpMember" id="cass_FranklinBancorpMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <element name="TaxEquivalizedPretaxIncome" id="cass_TaxEquivalizedPretaxIncome" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" xbrli:balance="credit"/>
  <element name="PercentageOfFinancialGoal" id="cass_PercentageOfFinancialGoal" type="num:percentItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <element name="DeferredTaxLiabilitiesPensionCosts" id="cass_DeferredTaxLiabilitiesPensionCosts" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="instant" xbrli:balance="credit"/>
  <element name="AccountsAndDraftsPayable" id="cass_AccountsAndDraftsPayable" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="instant" xbrli:balance="credit"/>
  <element name="BankServiceFees" id="cass_BankServiceFees" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" xbrli:balance="credit"/>
  <element name="CassCommercialBankMember" id="cass_CassCommercialBankMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <element name="ImpactOfReductionInCorporateTaxRateDeferredTaxAssetsAndLiabilitiesExpected" id="cass_ImpactOfReductionInCorporateTaxRateDeferredTaxAssetsAndLiabilitiesExpected" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" xbrli:balance="debit"/>
  <element name="IncreaseDecreaseInAccruedInterestResultingFromSettlementsWithTaxingAuthoritiesAndOtherPriorYearAdjustments" id="cass_IncreaseDecreaseInAccruedInterestResultingFromSettlementsWithTaxingAuthoritiesAndOtherPriorYearAdjustments" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" xbrli:balance="debit"/>
  <element name="IncomeFromManagementFees" id="cass_IncomeFromManagementFees" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" xbrli:balance="credit"/>
  <element name="DefinedBenefitPlanLongTermRateOfReturnOnAssetsExpectedRange" id="cass_DefinedBenefitPlanLongTermRateOfReturnOnAssetsExpectedRange" type="num:percentItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <element name="AdditionalOperatingLeaseLiability" id="cass_AdditionalOperatingLeaseLiability" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="instant" xbrli:balance="credit"/>
  <element name="CommonEquityTierOneRiskBasedCapital" id="cass_CommonEquityTierOneRiskBasedCapital" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="instant" xbrli:balance="credit"/>
  <element name="ScheduleOfCreditExposureOfLoanPortfolioByInternallyAssignedCreditGradeTableTextBlock" id="cass_ScheduleOfCreditExposureOfLoanPortfolioByInternallyAssignedCreditGradeTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <element name="SummaryOfOperationsPolicyTextBlock" id="cass_SummaryOfOperationsPolicyTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <element name="AnnualStandardDeviation" id="cass_AnnualStandardDeviation" type="num:percentItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <element name="UnamortizedIntangibleAssetAbstract" id="cass_UnamortizedIntangibleAssetAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
  <element name="FeeRevenueInscopeFASBASC606" id="cass_FeeRevenueInscopeFASBASC606" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" xbrli:balance="credit"/>
  <element name="InternallyDevelopedSoftwareMember" id="cass_InternallyDevelopedSoftwareMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <element name="LongTermRateOfReturnAllocation" id="cass_LongTermRateOfReturnAllocation" type="num:percentItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <element name="NonUnitedStatesCoreMember" id="cass_NonUnitedStatesCoreMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <element name="DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationTableTextBlock" id="cass_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <element name="EquitySecuritiesLargeCapMember" id="cass_EquitySecuritiesLargeCapMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <element name="PerformingLoansSubjectToSpecialMonitoringMember" id="cass_PerformingLoansSubjectToSpecialMonitoringMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <element name="ScheduleOfAmortizedCostAndFairValueTableTextBlock" id="cass_ScheduleOfAmortizedCostAndFairValueTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <element name="CorporateEliminationsAndOtherMember" id="cass_CorporateEliminationsAndOtherMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <element name="CommonEquityTierOneRiskBasedCapitalRequiredForCapitalAdequacy" id="cass_CommonEquityTierOneRiskBasedCapitalRequiredForCapitalAdequacy" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="instant" xbrli:balance="credit"/>
  <element name="TimeDeposits100000OrMoreAndLessThan250000" id="cass_TimeDeposits100000OrMoreAndLessThan250000" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="instant" xbrli:balance="credit"/>
  <element name="PercentageOfPretaxIncomeTaxRate" id="cass_PercentageOfPretaxIncomeTaxRate" type="num:percentItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <element name="IncreaseDecreaseInNonInterestBearingDemandDeposits" id="cass_IncreaseDecreaseInNonInterestBearingDemandDeposits" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" xbrli:balance="debit"/>
  <element name="TimeDeposits250000OrMore" id="cass_TimeDeposits250000OrMore" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="instant" xbrli:balance="credit"/>
  <element name="TimeDepositsWeightedAverageInterestRateAggregate" id="cass_TimeDepositsWeightedAverageInterestRateAggregate" type="num:percentItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="instant"/>
  <element name="AmortizationOfRestrictedStockBonus" id="cass_AmortizationOfRestrictedStockBonus" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" xbrli:balance="debit"/>
  <element name="ForeignEquitySecuritiesDevelopedMember" id="cass_ForeignEquitySecuritiesDevelopedMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <element name="UnitedStatesLargeCapPassiveMember" id="cass_UnitedStatesLargeCapPassiveMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
</schema>
