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  <xs:element id="fsbc_FixedToFloatingRateSubordinatedNotesIssuedSep2017Member" abstract="true" name="FixedToFloatingRateSubordinatedNotesIssuedSep2017Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="fsbc_AgriculturalLinesOfCreditMember" abstract="false" name="AgriculturalLinesOfCreditMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="fsbc_ScheduleOfCompositionOfNetworkDepositsTableTextBlock" abstract="false" name="ScheduleOfCompositionOfNetworkDepositsTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:textBlockItemType"/>
  <xs:element id="fsbc_SacramentoAdministrativeOfficeLeaseMaturityMay2026Member" abstract="true" name="SacramentoAdministrativeOfficeLeaseMaturityMay2026Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="fsbc_CDARSMember" abstract="false" name="CDARSMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="fsbc_FederalHomeLoanBankStockDividends" abstract="false" name="FederalHomeLoanBankStockDividends" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="fsbc_DebtSecuritiesAvailableForSaleUnrealizedLossPositionFairValue" abstract="false" name="DebtSecuritiesAvailableForSaleUnrealizedLossPositionFairValue" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="fsbc_DeferredTaxAssetsRightOfUseLiability" abstract="false" name="DeferredTaxAssetsRightOfUseLiability" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="fsbc_FarmlandMember" abstract="false" name="FarmlandMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="fsbc_LaborAndRelatedExpenseDeferredAsLoanOriginationCosts" abstract="false" name="LaborAndRelatedExpenseDeferredAsLoanOriginationCosts" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="fsbc_InterestBearingDomesticDepositTimeDeposits250000OrMore" abstract="false" name="InterestBearingDomesticDepositTimeDeposits250000OrMore" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="fsbc_NumberOfUnsecuredFederalFunds" abstract="false" name="NumberOfUnsecuredFederalFunds" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="fsbc_Exceeding3EmployeeContributionMember" abstract="true" name="Exceeding3EmployeeContributionMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="fsbc_FurnitureFixturesAndEquipmentMember" abstract="true" name="FurnitureFixturesAndEquipmentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="fsbc_ShareBasedPaymentArrangementExecutivesAndDirectorsMember" abstract="true" name="ShareBasedPaymentArrangementExecutivesAndDirectorsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="fsbc_NumberOfBranchOffices" abstract="false" name="NumberOfBranchOffices" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="fsbc_PropertyManagementFeesExpenses" abstract="false" name="PropertyManagementFeesExpenses" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="fsbc_FederalHomeLoanBankStockPolicyTextBlock" abstract="false" name="FederalHomeLoanBankStockPolicyTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:textBlockItemType"/>
  <xs:element id="fsbc_DebtInstrumentFloatingInterestRate" abstract="false" name="DebtInstrumentFloatingInterestRate" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types1:percentItemType"/>
  <xs:element id="fsbc_UndisbursedResidentialRealEstateLoansMember" abstract="true" name="UndisbursedResidentialRealEstateLoansMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="fsbc_LargestSingleDeposit" abstract="false" name="LargestSingleDeposit" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="fsbc_LoanRelatedFees" abstract="false" name="LoanRelatedFees" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="fsbc_ScheduleOfActivityInTheAllowanceForLoanLossesTableTextBlock" abstract="false" name="ScheduleOfActivityInTheAllowanceForLoanLossesTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:textBlockItemType"/>
  <xs:element id="fsbc_ICSMember" abstract="false" name="ICSMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="fsbc_NumberOfSeries" abstract="false" name="NumberOfSeries" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="fsbc_FederalReserveDiscountWindowMember" abstract="true" name="FederalReserveDiscountWindowMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="fsbc_FederalHomeLoanBankAdvancesStockPriceForSalesAndPurchases" abstract="false" name="FederalHomeLoanBankAdvancesStockPriceForSalesAndPurchases" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:perShareItemType"/>
  <xs:element id="fsbc_SecureLocalAgencyDepositMember" abstract="false" name="SecureLocalAgencyDepositMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="fsbc_LoanRelatedExpenses" abstract="false" name="LoanRelatedExpenses" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="fsbc_CommercialConstructionLoansMember" abstract="false" name="CommercialConstructionLoansMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="fsbc_ProceedsFromCancellationOfNoteIssuanceCosts" abstract="false" name="ProceedsFromCancellationOfNoteIssuanceCosts" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="fsbc_LowIncomeHousingCreditsCommitment" abstract="false" name="LowIncomeHousingCreditsCommitment" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="fsbc_UndisbursedCommercialRealEstateLoansMember" abstract="false" name="UndisbursedCommercialRealEstateLoansMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="fsbc_PercentageOfLargestSingleDepositToDeposits" abstract="false" name="PercentageOfLargestSingleDepositToDeposits" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types1:percentItemType"/>
  <xs:element id="fsbc_LowIncomeHousingTaxCredits" abstract="false" name="LowIncomeHousingTaxCredits" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="fsbc_ScheduleOfInterestBearingDepositsTableTextBlock" abstract="false" name="ScheduleOfInterestBearingDepositsTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:textBlockItemType"/>
  <xs:element id="fsbc_DisclosureInterestbearingDepositsAbstract" abstract="true" name="DisclosureInterestbearingDepositsAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="fsbc_WatchMember" abstract="false" name="WatchMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="fsbc_UndisbursedConstructionLoansMember" abstract="false" name="UndisbursedConstructionLoansMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="fsbc_InterestBearingDepositsTable" abstract="true" name="InterestBearingDepositsTable" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType"/>
  <xs:element id="fsbc_DeferredTaxAssetsGainLossOnAvailableForSaleAssets" abstract="false" name="DeferredTaxAssetsGainLossOnAvailableForSaleAssets" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="fsbc_ResidentialConstructionLoansMember" abstract="false" name="ResidentialConstructionLoansMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="fsbc_LongTermAssetsPolicyTextBlock" abstract="false" name="LongTermAssetsPolicyTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:textBlockItemType"/>
  <xs:element id="fsbc_SubordinatedNotesPolicyTextBlock" abstract="false" name="SubordinatedNotesPolicyTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:textBlockItemType"/>
  <xs:element id="fsbc_ConsumerAndOtherPortfolioSegmentMember" abstract="true" name="ConsumerAndOtherPortfolioSegmentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="fsbc_OccupancyFurnitureFixturesAndEquipmentMember" abstract="true" name="OccupancyFurnitureFixturesAndEquipmentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="fsbc_FHLBAgreementMember" abstract="true" name="FHLBAgreementMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="fsbc_ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalanceServicedOnBehalfOfOthers" abstract="false" name="ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalanceServicedOnBehalfOfOthers" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="fsbc_OneWayDeposits" abstract="false" name="OneWayDeposits" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="fsbc_FinancingReceivableNonaccrualInterestIncomeForegone" abstract="false" name="FinancingReceivableNonaccrualInterestIncomeForegone" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="fsbc_TemporaryAdministrativeOfficeInSanFranciscoMember" abstract="true" name="TemporaryAdministrativeOfficeInSanFranciscoMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="fsbc_RealEstatePortfolioSegmentMember" abstract="true" name="RealEstatePortfolioSegmentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="fsbc_TimeDepositAtFairValueDisclosure" abstract="false" name="TimeDepositAtFairValueDisclosure" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="fsbc_RealEstateRelatedLoansPercentage" abstract="false" name="RealEstateRelatedLoansPercentage" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types1:percentItemType"/>
  <xs:element id="fsbc_Deposits5MillionOrMoreAmount" abstract="false" name="Deposits5MillionOrMoreAmount" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="fsbc_ServiceChargesOnDepositAccounts" abstract="false" name="ServiceChargesOnDepositAccounts" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="fsbc_ProceedsFromLowIncomeHousingCredits" abstract="false" name="ProceedsFromLowIncomeHousingCredits" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="fsbc_TotalNetworkDeposits" abstract="false" name="TotalNetworkDeposits" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="fsbc_InterestBearingDepositsTextBlock" abstract="false" name="InterestBearingDepositsTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:textBlockItemType"/>
  <xs:element id="fsbc_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerFairValue" abstract="false" name="DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerFairValue" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="fsbc_CommonEquityTierRequiredToBeCategorizedWellCapitalizedAmount" abstract="false" name="CommonEquityTierRequiredToBeCategorizedWellCapitalizedAmount" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="fsbc_TenantImprovementMember" abstract="true" name="TenantImprovementMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="fsbc_InterestExpenseDomesticDepositLiabilitiesTimeDeposit250000Minimum" abstract="false" name="InterestExpenseDomesticDepositLiabilitiesTimeDeposit250000Minimum" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="fsbc_InvestmentInBankingSubsidiary" abstract="false" name="InvestmentInBankingSubsidiary" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="fsbc_NoncashTransactionToAcquireOperatingLeaseRightOfUseAsset" abstract="false" name="NoncashTransactionToAcquireOperatingLeaseRightOfUseAsset" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="fsbc_FinancialLiabilitiesRecordedAtAmortizedCostAbstract" abstract="true" name="FinancialLiabilitiesRecordedAtAmortizedCostAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="fsbc_NumberOfCorrespondentBanks" abstract="false" name="NumberOfCorrespondentBanks" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="fsbc_FiveUnsecuredFederalFundsLineOfCreditMember" abstract="true" name="FiveUnsecuredFederalFundsLineOfCreditMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="fsbc_BOLIPolicyTextBlock" abstract="false" name="BOLIPolicyTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:textBlockItemType"/>
  <xs:element id="fsbc_SevenUnsecuredFederalFundsLineOfCreditMember" abstract="true" name="SevenUnsecuredFederalFundsLineOfCreditMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="fsbc_A3EmployeeContributionMember" abstract="true" name="A3EmployeeContributionMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="fsbc_CommercialPaycheckProtectionProgramMember" abstract="false" name="CommercialPaycheckProtectionProgramMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="fsbc_CommercialLinesOfCreditMember" abstract="false" name="CommercialLinesOfCreditMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="fsbc_FederalReserveBankOfSanFranciscoMember" abstract="true" name="FederalReserveBankOfSanFranciscoMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="fsbc_LesseeOperatingLeaseLiabilityToBePaidDiscountForPresentValue" abstract="false" name="LesseeOperatingLeaseLiabilityToBePaidDiscountForPresentValue" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="fsbc_FederalReserveBankBranchAxis" abstract="true" name="FederalReserveBankBranchAxis" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType"/>
  <xs:element id="fsbc_Deposits5MillionOrMorePerDeposit" abstract="false" name="Deposits5MillionOrMorePerDeposit" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="fsbc_AuditorInformationAbstract" abstract="true" name="AuditorInformationAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="fsbc_CommonStockConvertibleSharesIssuable" abstract="false" name="CommonStockConvertibleSharesIssuable" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="fsbc_PaymentsForCapitalCallForVentureBackedInvestment" abstract="false" name="PaymentsForCapitalCallForVentureBackedInvestment" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="fsbc_TransferFromLoansHeldForSaleToLoansHeldForInvestment" abstract="false" name="TransferFromLoansHeldForSaleToLoansHeldForInvestment" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="fsbc_InterestBearingDepostisLineItems" abstract="true" name="InterestBearingDepostisLineItems" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="fsbc_TransfersOutOfOtherReceivables" abstract="false" name="TransfersOutOfOtherReceivables" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="fsbc_EntityControlledByExistingAndFormerBoardMembersAndAffiliatesMember" abstract="true" name="EntityControlledByExistingAndFormerBoardMembersAndAffiliatesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="fsbc_UndisbursedAgriculturalRealEstateLoansMember" abstract="false" name="UndisbursedAgriculturalRealEstateLoansMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="fsbc_CommonEquityTierRequiredToBeCategorizedWellCapitalizedRatioAsPercent" abstract="false" name="CommonEquityTierRequiredToBeCategorizedWellCapitalizedRatioAsPercent" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:pureItemType"/>
  <xs:element id="fsbc_Deposits5MillionOrMoreNumberOfDepositRelationships" abstract="false" name="Deposits5MillionOrMoreNumberOfDepositRelationships" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="fsbc_FixedToFloatingRateSubordinatedNotesIssuedAugust2022Member" abstract="true" name="FixedToFloatingRateSubordinatedNotesIssuedAugust2022Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="fsbc_FederalReserveBankAdvancesGeneralDebtObligationsDisclosuresCollateralPledged" abstract="false" name="FederalReserveBankAdvancesGeneralDebtObligationsDisclosuresCollateralPledged" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="fsbc_InterestExpenseRecognizedOnInterestBearingDepositsTableTextBlock" abstract="false" name="InterestExpenseRecognizedOnInterestBearingDepositsTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:textBlockItemType"/>
  <xs:element id="fsbc_PercentageOfDepositsOver5MillionToDeposits" abstract="false" name="PercentageOfDepositsOver5MillionToDeposits" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types1:percentItemType"/>
  <xs:element id="fsbc_LettersOfCreditPledgedAsSecurityForStateOfCaliforniaDepositsMember" abstract="true" name="LettersOfCreditPledgedAsSecurityForStateOfCaliforniaDepositsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="fsbc_InterestBearingDomesticDepositBrokeredTimeDeposits" abstract="false" name="InterestBearingDomesticDepositBrokeredTimeDeposits" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="fsbc_ReclassificationAdjustmentForNetRealizedGainsIncludedInNetIncome" abstract="false" name="ReclassificationAdjustmentForNetRealizedGainsIncludedInNetIncome" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="fsbc_NetGainOnSaleOfSecuritiesAvailableForSale" abstract="false" name="NetGainOnSaleOfSecuritiesAvailableForSale" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="fsbc_PaymentsForOriginationOfLoansNetOfProceedsFromRepayments" abstract="false" name="PaymentsForOriginationOfLoansNetOfProceedsFromRepayments" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="fsbc_FederalReserveBankBranchDomain" abstract="true" name="FederalReserveBankBranchDomain" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="fsbc_FixedToFloatingRateSubordinatedNotesIssuedNov2019Member" abstract="true" name="FixedToFloatingRateSubordinatedNotesIssuedNov2019Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="fsbc_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsUnvestedWeightedAverageRemainingContractualTerms" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsUnvestedWeightedAverageRemainingContractualTerms" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="fsbc_CashAndCashEquivalentsLessTimeDepositsAtCarryingValue" abstract="false" name="CashAndCashEquivalentsLessTimeDepositsAtCarryingValue" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="fsbc_DepositsAndFederalFundsPurchasedMember" abstract="true" name="DepositsAndFederalFundsPurchasedMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="fsbc_FinancialAssetsRecordedAtAmortizedCostAbstract" abstract="true" name="FinancialAssetsRecordedAtAmortizedCostAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="fsbc_SubsidiaryOrEquityMethodInvesteeUndistributedBankingSubsidiaryIncome" abstract="false" name="SubsidiaryOrEquityMethodInvesteeUndistributedBankingSubsidiaryIncome" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="fsbc_OtherCommitmentsMember" abstract="false" name="OtherCommitmentsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="fsbc_LoanConcentrationRiskMember" abstract="true" name="LoanConcentrationRiskMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
</xs:schema>
