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<!-- DFIN ActiveDisclosure(SM) XBRL Schema Document - http://www.dfinsolutions.com/ -->
<!-- Creation Date      : 2019-05-01T14:11:00.6132338+00:00 -->
<!-- Version            : 3.4.7044.22220 -->
<!-- Package ID         : fd289400f33d460b9d9adc6cc8a89093 -->
<!-- Copyright (c) 2019 Donnelley Financial Solutions, Inc. All Rights Reserved. -->
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  <xsd:element id="fmao_LoanReceivableWeightedAverageUsefulLife" name="LoanReceivableWeightedAverageUsefulLife" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="fmao_BusinessCombinationIdentifiableAssetsInPremisesAndEquipmentWrittenDownValue" name="BusinessCombinationIdentifiableAssetsInPremisesAndEquipmentWrittenDownValue" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="fmao_BusinessCombinationAverageRemainingUsefulLife" name="BusinessCombinationAverageRemainingUsefulLife" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="fmao_FairValueForCertificateOfDepositValuationAmount" name="FairValueForCertificateOfDepositValuationAmount" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="fmao_FairValueForCertificateOfDepositAmortizationPeriod" name="FairValueForCertificateOfDepositAmortizationPeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="fmao_FairValueOfFederalHomeLoanBankAdvancesValuationAmount" name="FairValueOfFederalHomeLoanBankAdvancesValuationAmount" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="fmao_FairValueOfFederalHomeLoanBankAdvancesAmortizationPeriod" name="FairValueOfFederalHomeLoanBankAdvancesAmortizationPeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="fmao_ConsumerRealEstateLoanMember" name="ConsumerRealEstateLoanMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="fmao_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesCarryingAmountAllowance" name="CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesCarryingAmountAllowance" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="fmao_BusinessAcquisitionsProFormaNetInterestIncomeBeforeProvisionForLoanLosses" name="BusinessAcquisitionsProFormaNetInterestIncomeBeforeProvisionForLoanLosses" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="fmao_BusinessAcquisitionsProFormaProvisionForLoanLosses" name="BusinessAcquisitionsProFormaProvisionForLoanLosses" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="fmao_BusinessAcquisitionsProFormaNetInterestIncomeAfterProvisionForLoanLosses" name="BusinessAcquisitionsProFormaNetInterestIncomeAfterProvisionForLoanLosses" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="fmao_BusinessAcquisitionsProFormaNoninterestIncome" name="BusinessAcquisitionsProFormaNoninterestIncome" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="fmao_BusinessAcquisitionsProFormaNoninterestExpense" name="BusinessAcquisitionsProFormaNoninterestExpense" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="fmao_BusinessAcquisitionsProFormaIncomeLossBeforeIncomeTaxes" name="BusinessAcquisitionsProFormaIncomeLossBeforeIncomeTaxes" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="fmao_BusinessAcquisitionsProFormaIncomeTaxesExpenseBenefit" name="BusinessAcquisitionsProFormaIncomeTaxesExpenseBenefit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="fmao_BusinessAcquisitionProFormaEarningsPerShareBasicAndDiluted" name="BusinessAcquisitionProFormaEarningsPerShareBasicAndDiluted" type="num:perShareItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="fmao_FiniteLivedIntangibleAssetsAmortizationExpenseYearSix" name="FiniteLivedIntangibleAssetsAmortizationExpenseYearSix" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="fmao_FiniteLivedIntangibleAssetsAmortizationExpenseYearSeven" name="FiniteLivedIntangibleAssetsAmortizationExpenseYearSeven" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="fmao_GenevaMember" name="GenevaMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="fmao_MaturityPeriodForUnderWaterSecurities" name="MaturityPeriodForUnderWaterSecurities" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="fmao_ForUnderWaterSecuritiesLossPositionExpirationPeriod" name="ForUnderWaterSecuritiesLossPositionExpirationPeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="fmao_AvailableForSaleSecuritiesGrossRealizedGainLossTaxExpenses" name="AvailableForSaleSecuritiesGrossRealizedGainLossTaxExpenses" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="fmao_AvailableForSaleSecuritiesDebtMaturitiesFairValueExcludingMortgageBackedSecurities" name="AvailableForSaleSecuritiesDebtMaturitiesFairValueExcludingMortgageBackedSecurities" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="fmao_LoansAndLeasesReceivablePurchaseAccountingAdjustments" name="LoansAndLeasesReceivablePurchaseAccountingAdjustments" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="fmao_IndustrialDevelopmentBondsMember" name="IndustrialDevelopmentBondsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="fmao_AgricultureRealEstateMember" name="AgricultureRealEstateMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="fmao_AgriculturalLoanMember" name="AgriculturalLoanMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="fmao_MajorCategoryOfReceivablesDueWithinOneYearMember" name="MajorCategoryOfReceivablesDueWithinOneYearMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="fmao_MajorCategoryOfReceivablesDueWithinOneYearToFiveYearsMember" name="MajorCategoryOfReceivablesDueWithinOneYearToFiveYearsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="fmao_MajorCategoryOfReceivablesOverFiveYearsMember" name="MajorCategoryOfReceivablesOverFiveYearsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="fmao_CommercialAndIndustrialAndIndustrialDevelopmentBondsMember" name="CommercialAndIndustrialAndIndustrialDevelopmentBondsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="fmao_LeverageRatioTwo" name="LeverageRatioTwo" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="fmao_GoodMember" name="GoodMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="fmao_SatisfactoryMember" name="SatisfactoryMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="fmao_RepaymentPeriodOfLoanWithReasonableReductionOfPrincipalBalance" name="RepaymentPeriodOfLoanWithReasonableReductionOfPrincipalBalance" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="fmao_ExcellentAndGoodMember" name="ExcellentAndGoodMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="fmao_SatisfactoryMonitoredMember" name="SatisfactoryMonitoredMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="fmao_LossMember" name="LossMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="fmao_ConsumerOtherFinancingReceivablesMember" name="ConsumerOtherFinancingReceivablesMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="fmao_AdditionalFundsAvailableToBeAdvancedInConnectionWithImpairedLoans" name="AdditionalFundsAvailableToBeAdvancedInConnectionWithImpairedLoans" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="fmao_MaximumTimeForReevaluation" name="MaximumTimeForReevaluation" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="fmao_ReEvaluationPeriodForRealEstate" name="ReEvaluationPeriodForRealEstate" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="fmao_UnsecuredConsumerLoansCreditCardCreditsAndOverdraft" name="UnsecuredConsumerLoansCreditCardCreditsAndOverdraft" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="fmao_DelinquentPeriodForChargingDownConsumerLoans" name="DelinquentPeriodForChargingDownConsumerLoans" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="fmao_DelinquentPeriodForChargingDownCommercialAndAgriculturalCredits" name="DelinquentPeriodForChargingDownCommercialAndAgriculturalCredits" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="fmao_AllowanceForUnfundedLoanCommitmentsAndLettersOfCredit" name="AllowanceForUnfundedLoanCommitmentsAndLettersOfCredit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="fmao_OtherNonInterestIncomeExpenseRecoveryRelatedToUnfunded" name="OtherNonInterestIncomeExpenseRecoveryRelatedToUnfunded" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="fmao_AllowanceForCreditLossesAbstract" name="AllowanceForCreditLossesAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="fmao_FinancingReceivableAllowanceForCreditLossesAcquiredWithDeterioratedCreditQualityEndingPeriod" name="FinancingReceivableAllowanceForCreditLossesAcquiredWithDeterioratedCreditQualityEndingPeriod" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="fmao_FinancingReceivablesAbstract" name="FinancingReceivablesAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="fmao_UnfundedLoanCommitmentAndLettersOfCreditMember" name="UnfundedLoanCommitmentAndLettersOfCreditMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="fmao_MaximumMaturityPeriodOfCarryingAmountInterestBearingDeposits" name="MaximumMaturityPeriodOfCarryingAmountInterestBearingDeposits" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="fmao_CashCashEquivalentsAndFederalFundsSoldFairValueDisclosure" name="CashCashEquivalentsAndFederalFundsSoldFairValueDisclosure" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="fmao_InterestBearingTimeDepositsFairValueDisclosure" name="InterestBearingTimeDepositsFairValueDisclosure" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="fmao_InterestReceivableFairValueDisclosure" name="InterestReceivableFairValueDisclosure" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="fmao_InterestPayableFairValueDisclosure" name="InterestPayableFairValueDisclosure" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="fmao_InterestBearingDepositsLiabilityMember" name="InterestBearingDepositsLiabilityMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="fmao_NonInterestBearingDepositsMember" name="NonInterestBearingDepositsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="fmao_TimeDepositsMember" name="TimeDepositsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="fmao_USStatesAndPoliticalSubdivisionsTaxExemptDebtSecuritiesMember" name="USStatesAndPoliticalSubdivisionsTaxExemptDebtSecuritiesMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="fmao_USStatesAndPoliticalSubdivisionsTaxableDebtSecuritiesMember" name="USStatesAndPoliticalSubdivisionsTaxableDebtSecuritiesMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="fmao_ImpairedLoansMember" name="ImpairedLoansMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="fmao_FeesAndCommissionsIncomeAbstract" name="FeesAndCommissionsIncomeAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="fmao_SummaryOfSignificantAccountingPoliciesLineItems" name="SummaryOfSignificantAccountingPoliciesLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="fmao_SummaryOfSignificantAccountingPoliciesTable" name="SummaryOfSignificantAccountingPoliciesTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" xbrli:periodType="duration" nillable="true" abstract="true" />
</xsd:schema>
