{"url_path":"/sec/nksh/10-q/2026/cover-page","section_key":"cover-page","section_title":"Cover Page","topic":"sec","document":{"doc_type":"10-Q","doc_date":"2026-05-13","source_url":"https://www.sec.gov/Archives/edgar/data/796534/0001193125-26-220869-index.html","accession_number":"0001193125-26-220869","cik":"0000796534","ticker":"NKSH","issuer_name":"NATIONAL BANKSHARES INC","edgar_url":"https://www.sec.gov/Archives/edgar/data/796534/0001193125-26-220869-index.html","primary_entity_key":"0000796534","primary_entity_name":"NATIONAL BANKSHARES INC"},"word_count":459,"has_tables":true,"body_markdown":"10-Q\n\n0000796534Q1false--12-31http://fasb.org/us-gaap/2025#AvailableForSaleSecuritiesDebtSecuritieshttp://fasb.org/us-gaap/2025#AvailableForSaleSecuritiesDebtSecuritieshttp://fasb.org/us-gaap/2025#OtherLiabilitieshttp://fasb.org/us-gaap/2025#OtherLiabilitieshttp://fasb.org/us-gaap/2025#OtherAssetshttp://fasb.org/us-gaap/2025#OtherAssets0000796534nksh:OtherConsumerLoansMembernksh:FinancingReceivables30To89DaysPastDueMembernksh:ConsumerNonRealEstatePortfolioSegmentMember2026-03-310000796534us-gaap:CorporateDebtSecuritiesMemberus-gaap:FairValueInputsLevel1Member2025-12-310000796534us-gaap:FairValueInputsLevel2Memberus-gaap:USStatesAndPoliticalSubdivisionsMember2025-12-310000796534nksh:ConsumerNonRealEstatePortfolioSegmentMember2024-12-310000796534us-gaap:USGovernmentAgenciesDebtSecuritiesMemberus-gaap:FairValueInputsLevel1Member2025-12-310000796534us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember2025-03-310000796534nksh:ConsumerNonRealEstatePortfolioSegmentMemberus-gaap:PassMemberus-gaap:CreditCardReceivablesMember2025-12-310000796534nksh:InsuranceAndInvestmentMember2025-01-012025-03-310000796534nksh:RealEstateConstructionPortfolioSegmentMember2026-01-012026-03-310000796534nksh:OtherConsumerLoansMembernksh:ConsumerNonRealEstatePortfolioSegmentMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember2025-12-310000796534us-gaap:CommercialRealEstatePortfolioSegmentMembernksh:MultifamilyRealEstateMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember2026-03-310000796534nksh:RealEstateConstructionPortfolioSegmentMembernksh:ConstructionOtherMember2026-03-310000796534nksh:CommercialNonRealEstateSegmentMembernksh:CollectivelyEvaluatedMember2025-12-3100007965342024-12-310000796534nksh:FinancingReceivables30To89DaysPastDueMembernksh:ConsumerRealEstatePortfolioSegmentMembernksh:ClosedEndFirstLiensMember2026-03-310000796534nksh:ConsumerNonRealEstatePortfolioSegmentMemberus-gaap:CreditCardReceivablesMemberus-gaap:PassMember2026-03-3100007965342025-01-012025-12-310000796534nksh:FinancingReceivables30To89DaysPastDueMembernksh:RealEstateConstructionPortfolioSegmentMembernksh:ConstructionOtherMember2026-03-310000796534nksh:PublicSectorAndIDAPortfolioSegmentMembernksh:CollectivelyEvaluatedMember2025-12-310000796534nksh:Construction14FamilyResidentialMemberus-gaap:FinancialAssetNotPastDueMembernksh:RealEstateConstructionPortfolioSegmentMember2025-12-310000796534us-gaap:CommercialRealEstatePortfolioSegmentMember2025-03-310000796534us-gaap:RestrictedStockMember2025-12-310000796534nksh:ConsumerNonRealEstatePortfolioSegmentMemberus-gaap:CreditCardReceivablesMember2026-03-310000796534nksh:CommercialNonRealEstateSegmentMember2025-03-310000796534us-gaap:MortgageBackedSecuritiesMemberus-gaap:FairValueInputsLevel2Member2025-12-310000796534srt:FederalHomeLoanBankOfAtlantaMembernksh:NationalBankOfBlacksburgMember2026-03-310000796534us-gaap:USStatesAndPoliticalSubdivisionsMember2026-03-310000796534nksh:FinancingReceivables30To89DaysPastDueMembernksh:PublicSectorAndIDAPortfolioSegmentMember2025-12-310000796534us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2026-03-310000796534nksh:RestrictedStockAwardsAndRestrictedStockUnitsMember2025-12-310000796534nksh:RealEstateConstructionPortfolioSegmentMember2025-12-310000796534nksh:PublicSectorAndIDAPortfolioSegmentMember2025-03-310000796534us-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMembernksh:PublicSectorAndIDAPortfolioSegmentMember2025-12-310000796534us-gaap:CommercialRealEstatePortfolioSegmentMemberus-gaap:FinancialAssetNotPastDueMembernksh:MultifamilyRealEstateMember2025-12-310000796534nksh:ConsumerRealEstatePortfolioSegmentMembernksh:EquityLinesMembernksh:ClassifiedExcludingImpairedMember2026-03-310000796534nksh:IndividuallyEvaluatedMembernksh:CommercialNonRealEstateSegmentMember2025-12-310000796534us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2025-03-310000796534nksh:OtherConsumerLoansMembernksh:ConsumerNonRealEstatePortfolioSegmentMemberus-gaap:SpecialMentionMember2025-12-310000796534nksh:FinancingReceivables30To89DaysPastDueMembernksh:ConsumerNonRealEstatePortfolioSegmentMemberus-gaap:CreditCardReceivablesMember2026-03-310000796534nksh:ConsumerNonRealEstatePortfolioSegmentMemberus-gaap:FinancialAssetNotPastDueMemberus-gaap:CreditCardReceivablesMember2026-03-310000796534us-gaap:CommercialRealEstatePortfolioSegmentMembernksh:CommercialRealEstateOtherMember2025-12-310000796534us-gaap:SpecialMentionMember2025-12-310000796534us-gaap:CorporateDebtSecuritiesMember2026-03-310000796534us-gaap:AutomobileLoanMembernksh:ConsumerNonRealEstatePortfolioSegmentMember2025-12-310000796534nksh:ConsumerRealEstatePortfolioSegmentMember2025-12-310000796534nksh:OtherConsumerLoansMembernksh:ConsumerNonRealEstatePortfolioSegmentMembernksh:ClassifiedExcludingImpairedMember2025-12-310000796534us-gaap:FairValueInputsLevel2Member2025-12-310000796534us-gaap:AutomobileLoanMembernksh:ConsumerNonRealEstatePortfolioSegmentMemberus-gaap:FinancialAssetNotPastDueMember2026-03-310000796534us-gaap:CommercialMortgageBackedSecuritiesMember2025-12-310000796534nksh:InvestorOwnedResidentialRealEstateMembernksh:ConsumerRealEstatePortfolioSegmentMemberus-gaap:PassMember2026-03-310000796534nksh:ConsumerNonRealEstatePortfolioSegmentMember2026-01-012026-03-310000796534nksh:ConsumerNonRealEstatePortfolioSegmentMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMemberus-gaap:CreditCardReceivablesMember2025-12-310000796534us-gaap:CommonStockIncludingAdditionalPaidInCapitalMember2025-12-310000796534nksh:InvestorOwnedResidentialRealEstateMembernksh:ConsumerRealEstatePortfolioSegmentMemberus-gaap:FinancialAssetNotPastDueMember2025-12-310000796534nksh:FinancingReceivables30To89DaysPastDueMember2025-12-310000796534us-gaap:FinancialAssetNotPastDueMembernksh:RealEstateConstructionPortfolioSegmentMembernksh:ConstructionOtherMember2025-12-310000796534us-gaap:CommercialRealEstatePortfolioSegmentMember2026-03-310000796534us-gaap:CommercialRealEstatePortfolioSegmentMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMembernksh:CommercialRealEstateOwnerOccupiedMember2025-12-310000796534us-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMembernksh:RealEstateConstructionPortfolioSegmentMembernksh:ConstructionOtherMember2025-12-310000796534nksh:ConsumerNonRealEstatePortfolioSegmentMember2026-03-310000796534nksh:OtherConsumerLoansMembernksh:ConsumerNonRealEstatePortfolioSegmentMember2026-03-3100007965342026-03-310000796534nksh:ConsumerRealEstatePortfolioSegmentMember2025-03-310000796534nksh:OtherConsumerLoansMembernksh:ConsumerNonRealEstatePortfolioSegmentMemberus-gaap:SpecialMentionMember2026-03-310000796534us-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMembernksh:CommercialAndIndustrialMembernksh:CommercialNonRealEstateSegmentMember2026-03-310000796534nksh:RealEstateConstructionPortfolioSegmentMember2025-03-310000796534nksh:OtherConsumerLoansMembernksh:ConsumerNonRealEstatePortfolioSegmentMember2025-03-310000796534us-gaap:FairValueInputsLevel3Member2025-12-310000796534nksh:IndividuallyEvaluatedMembernksh:PublicSectorAndIDAPortfolioSegmentMember2026-03-310000796534nksh:ConsumerNonRealEstatePortfolioSegmentMember2025-01-012025-03-310000796534us-gaap:FairValueInputsLevel3Memberus-gaap:USGovernmentAgenciesDebtSecuritiesMember2026-03-310000796534nksh:RealEstateConstructionPortfolioSegmentMembernksh:CollectivelyEvaluatedMember2025-12-310000796534nksh:ConsumerRealEstatePortfolioSegmentMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMembernksh:EquityLinesMember2025-12-310000796534us-gaap:CommercialRealEstatePortfolioSegmentMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMembernksh:CommercialRealEstateOtherMember2025-12-310000796534us-gaap:FinancialAssetNotPastDueMembernksh:CommercialAndIndustrialMembernksh:CommercialNonRealEstateSegmentMember2025-12-310000796534nksh:PublicSectorAndIDAPortfolioSegmentMemberus-gaap:PassMember2025-12-310000796534nksh:ConsumerRealEstatePortfolioSegmentMemberus-gaap:PassMembernksh:EquityLinesMember2025-12-310000796534us-gaap:CoreDepositsMember2026-01-012026-03-310000796534nksh:CommercialAndIndustrialMembernksh:CommercialNonRealEstateSegmentMember2026-03-310000796534nksh:ConsumerNonRealEstatePortfolioSegmentMember2025-03-310000796534us-gaap:RetainedEarningsMember2024-12-310000796534nksh:FinancingReceivables30To89DaysPastDueMemberus-gaap:CommercialRealEstatePortfolioSegmentMembernksh:CommercialRealEstateOtherMember2026-03-310000796534us-gaap:CommercialRealEstatePortfolioSegmentMemberus-gaap:SpecialMentionMembernksh:CommercialRealEstateOtherMember2026-03-310000796534nksh:ConsumerRealEstatePortfolioSegmentMemberus-gaap:PassMembernksh:EquityLinesMember2026-03-310000796534us-gaap:CommercialRealEstatePortfolioSegmentMemberus-gaap:FinancialAssetNotPastDueMembernksh:CommercialRealEstateOtherMember2025-12-3100007965342026-05-130000796534us-gaap:CommonStockIncludingAdditionalPaidInCapitalMember2025-03-310000796534us-gaap:AutomobileLoanMembernksh:ConsumerNonRealEstatePortfolioSegmentMemberus-gaap:PassMember2026-03-310000796534nksh:ClassifiedExcludingImpairedMember2026-03-310000796534us-gaap:FairValueInputsLevel1Memberus-gaap:USStatesAndPoliticalSubdivisionsMember2025-12-310000796534us-gaap:FiduciaryAndTrustMember2026-01-012026-03-310000796534nksh:ConsumerRealEstatePortfolioSegmentMembernksh:MultifamilyRealEstateMember2025-12-310000796534us-gaap:AutomobileLoanMembernksh:ConsumerNonRealEstatePortfolioSegmentMember2025-01-012025-12-310000796534us-gaap:FairValueInputsLevel1Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2025-12-310000796534nksh:FinancingReceivables30To89DaysPastDueMemberus-gaap:CommercialRealEstatePortfolioSegmentMembernksh:MultifamilyRealEstateMember2026-03-310000796534us-gaap:FairValueInputsLevel2Memberus-gaap:CorporateDebtSecuritiesMember2025-12-310000796534nksh:ConsumerRealEstatePortfolioSegmentMembernksh:MultifamilyRealEstateMembernksh:ClassifiedExcludingImpairedMember2025-12-310000796534us-gaap:UnfundedLoanCommitmentMember2025-12-310000796534us-gaap:CommercialRealEstatePortfolioSegmentMembernksh:CommercialRealEstateOtherMember2026-03-310000796534nksh:IndividuallyEvaluatedMembernksh:ConsumerNonRealEstatePortfolioSegmentMember2026-03-3100007965342025-01-012025-03-310000796534nksh:ConsumerRealEstatePortfolioSegmentMembernksh:ClosedEndFirstLiensMember2025-01-012025-12-310000796534us-gaap:FairValueInputsLevel3Memberus-gaap:USStatesAndPoliticalSubdivisionsMember2026-03-310000796534us-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMembernksh:RealEstateConstructionPortfolioSegmentMembernksh:ConstructionOtherMember2026-03-310000796534us-gaap:MortgageBackedSecuritiesMemberus-gaap:FairValueInputsLevel2Member2026-03-310000796534nksh:IndividuallyEvaluatedMemberus-gaap:CommercialRealEstatePortfolioSegmentMember2025-12-310000796534nksh:InvestorOwnedResidentialRealEstateMembernksh:FinancingReceivables30To89DaysPastDueMembernksh:ConsumerRealEstatePortfolioSegmentMember2025-12-310000796534us-gaap:CorporateDebtSecuritiesMemberus-gaap:FairValueInputsLevel1Member2026-03-310000796534us-gaap:CoreDepositsMember2026-03-310000796534us-gaap:CommercialRealEstatePortfolioSegmentMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMembernksh:CommercialRealEstateOwnerOccupiedMember2026-03-310000796534nksh:BearingInsuranceGroupLLCMemberus-gaap:SubsequentEventMember2026-05-010000796534us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2025-01-012025-03-310000796534nksh:ConsumerRealEstatePortfolioSegmentMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMembernksh:ClosedEndFirstLiensMember2026-03-310000796534us-gaap:CommonStockIncludingAdditionalPaidInCapitalMember2024-12-310000796534nksh:ClosedEndJuniorLiensMembernksh:ConsumerRealEstatePortfolioSegmentMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember2025-12-310000796534nksh:FinancingReceivables30To89DaysPastDueMembernksh:ClosedEndJuniorLiensMembernksh:ConsumerRealEstatePortfolioSegmentMember2025-12-310000796534us-gaap:CollateralPledgedMemberus-gaap:CommercialRealEstatePortfolioSegmentMembernksh:CommercialRealEstateOwnerOccupiedMember2025-12-310000796534us-gaap:CommercialRealEstatePortfolioSegmentMembernksh:CollectivelyEvaluatedMember2025-12-310000796534us-gaap:CommercialRealEstatePortfolioSegmentMembernksh:CommercialRealEstateOwnerOccupiedMember2026-03-310000796534us-gaap:AutomobileLoanMembernksh:ConsumerNonRealEstatePortfolioSegmentMember2026-01-012026-03-310000796534nksh:InvestorOwnedResidentialRealEstateMembernksh:FinancingReceivables30To89DaysPastDueMembernksh:ConsumerRealEstatePortfolioSegmentMember2026-03-310000796534nksh:CommercialNonRealEstateSegmentMember2025-12-310000796534nksh:OtherConsumerLoansMembernksh:FinancingReceivables30To89DaysPastDueMembernksh:ConsumerNonRealEstatePortfolioSegmentMember2025-12-310000796534us-gaap:DepositAccountMember2025-01-012025-03-310000796534nksh:InvestorOwnedResidentialRealEstateMemberus-gaap:CommercialRealEstatePortfolioSegmentMemberus-gaap:PassMember2025-12-310000796534us-gaap:FairValueInputsLevel3Memberus-gaap:CorporateDebtSecuritiesMember2026-03-310000796534nksh:ConsumerRealEstatePortfolioSegmentMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMembernksh:ClosedEndFirstLiensMember2025-12-310000796534us-gaap:FairValueInputsLevel2Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2026-03-310000796534nksh:ConsumerRealEstatePortfolioSegmentMemberus-gaap:FinancialAssetNotPastDueMembernksh:ClosedEndFirstLiensMember2026-03-310000796534nksh:PublicSectorAndIDAPortfolioSegmentMembernksh:CollectivelyEvaluatedMember2026-03-310000796534us-gaap:RestrictedStockMember2026-03-310000796534nksh:ConsumerRealEstatePortfolioSegmentMember2025-01-012025-12-310000796534us-gaap:FinancialAssetNotPastDueMember2025-12-310000796534nksh:ConsumerRealEstatePortfolioSegmentMembernksh:ClosedEndFirstLiensMember2025-12-310000796534us-gaap:CommercialRealEstatePortfolioSegmentMemberus-gaap:PassMembernksh:CommercialRealEstateOwnerOccupiedMember2025-12-310000796534nksh:PublicSectorAndIDAPortfolioSegmentMember2026-03-310000796534nksh:CollectivelyEvaluatedMember2025-12-310000796534nksh:CommercialAndIndustrialMembernksh:CommercialNonRealEstateSegmentMember2025-01-012025-12-310000796534nksh:FinancingReceivables30To89DaysPastDueMemberus-gaap:AutomobileLoanMembernksh:ConsumerNonRealEstatePortfolioSegmentMember2026-03-310000796534us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2026-01-012026-03-310000796534us-gaap:CommercialRealEstatePortfolioSegmentMemberus-gaap:PassMembernksh:CommercialRealEstateOtherMember2026-03-310000796534us-gaap:CommercialRealEstatePortfolioSegmentMembernksh:MultifamilyRealEstateMembernksh:ClassifiedExcludingImpairedMember2026-03-310000796534nksh:ConsumerRealEstateLoansMembernksh:RealEstateConstructionPortfolioSegmentMember2025-12-310000796534us-gaap:AccumulatedOtherComprehensiveIncomeMember2025-01-012025-03-310000796534us-gaap:AutomobileLoanMembernksh:ConsumerNonRealEstatePortfolioSegmentMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember2026-03-310000796534nksh:RealEstateConstructionPortfolioSegmentMember2025-01-012025-12-310000796534us-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMembernksh:CommercialAndIndustrialMembernksh:CommercialNonRealEstateSegmentMember2025-12-310000796534nksh:ConsumerRealEstatePortfolioSegmentMembernksh:ClosedEndFirstLiensMember2026-01-012026-03-310000796534nksh:ConsumerRealEstatePortfolioSegmentMembernksh:ClosedEndFirstLiensMemberus-gaap:SpecialMentionMember2025-12-310000796534us-gaap:CoreDepositsMember2025-12-310000796534us-gaap:FinancialAssetNotPastDueMembernksh:RealEstateConstructionPortfolioSegmentMembernksh:ConstructionOtherMember2026-03-310000796534nksh:RealEstateConstructionPortfolioSegmentMembernksh:ConstructionOtherMember2025-12-310000796534us-gaap:AutomobileLoanMembernksh:ConsumerNonRealEstatePortfolioSegmentMemberus-gaap:PassMember2025-12-310000796534nksh:Construction14FamilyResidentialMembernksh:RealEstateConstructionPortfolioSegmentMember2025-12-310000796534us-gaap:CorporateDebtSecuritiesMember2025-12-310000796534us-gaap:ProductAndServiceOtherMember2026-01-012026-03-310000796534us-gaap:CommercialRealEstatePortfolioSegmentMembernksh:ClassifiedExcludingImpairedMembernksh:CommercialRealEstateOtherMember2026-03-310000796534nksh:PublicSectorAndIDAPortfolioSegmentMember2024-12-310000796534us-gaap:PassMembernksh:CommercialAndIndustrialMembernksh:CommercialNonRealEstateSegmentMember2025-12-310000796534us-gaap:CollateralPledgedMemberus-gaap:CommercialRealEstatePortfolioSegmentMembernksh:CommercialRealEstateOtherMember2025-12-310000796534nksh:CommercialNonRealEstateSegmentMember2024-12-310000796534nksh:PublicSectorAndIDAPortfolioSegmentMember2025-01-012025-12-310000796534us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember2025-12-310000796534us-gaap:FairValueInputsLevel3Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2026-03-310000796534us-gaap:FairValueInputsLevel3Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2025-12-310000796534us-gaap:PassMembernksh:RealEstateConstructionPortfolioSegmentMembernksh:ConstructionResidentialMember2025-12-310000796534nksh:InvestorOwnedResidentialRealEstateMemberus-gaap:CommercialRealEstatePortfolioSegmentMember2025-12-310000796534us-gaap:CommercialRealEstatePortfolioSegmentMembernksh:MultifamilyRealEstateMemberus-gaap:PassMember2026-03-310000796534nksh:RealEstateConstructionPortfolioSegmentMember2024-12-310000796534us-gaap:FairValueInputsLevel1Member2026-03-310000796534us-gaap:CommercialRealEstatePortfolioSegmentMembernksh:CommercialRealEstateOwnerOccupiedMemberus-gaap:SpecialMentionMember2025-12-310000796534us-gaap:FairValueMeasurementsNonrecurringMemberus-gaap:ChangeDuringPeriodFairValueDisclosureMembernksh:LoansHeldForSaleMember2025-01-012025-12-310000796534us-gaap:FairValueInputsLevel3Memberus-gaap:MortgageBackedSecuritiesMember2026-03-310000796534us-gaap:UnfundedLoanCommitmentMember2024-12-310000796534us-gaap:SpecialMentionMembernksh:CommercialAndIndustrialMembernksh:CommercialNonRealEstateSegmentMember2026-03-310000796534us-gaap:AccumulatedOtherComprehensiveIncomeMember2024-12-310000796534nksh:ConsumerRealEstatePortfolioSegmentMembernksh:EquityLinesMember2025-12-310000796534nksh:ClosedEndJuniorLiensMembernksh:ConsumerRealEstatePortfolioSegmentMember2026-03-310000796534us-gaap:UnfundedLoanCommitmentMember2026-03-310000796534nksh:ConsumerRealEstatePortfolioSegmentMembernksh:EquityLinesMember2026-03-310000796534us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember2026-01-012026-03-310000796534nksh:ClassifiedExcludingImpairedMember2025-12-310000796534nksh:FinancingReceivables30To89DaysPastDueMemberus-gaap:CommercialRealEstatePortfolioSegmentMembernksh:CommercialRealEstateOwnerOccupiedMember2026-03-310000796534nksh:CommercialAndIndustrialMembernksh:CommercialNonRealEstateSegmentMembernksh:ClassifiedExcludingImpairedMember2026-03-310000796534nksh:ConsumerRealEstatePortfolioSegmentMemberus-gaap:FinancialAssetNotPastDueMembernksh:EquityLinesMember2025-12-310000796534us-gaap:CommercialRealEstatePortfolioSegmentMemberus-gaap:FinancialAssetNotPastDueMembernksh:CommercialRealEstateOwnerOccupiedMember2025-12-310000796534us-gaap:FairValueInputsLevel1Member2025-12-310000796534us-gaap:AutomobileLoanMembernksh:ConsumerNonRealEstatePortfolioSegmentMembernksh:ClassifiedExcludingImpairedMember2025-12-310000796534nksh:ConsumerRealEstatePortfolioSegmentMembernksh:ClosedEndFirstLiensMembernksh:ClassifiedExcludingImpairedMember2025-12-310000796534us-gaap:FairValueInputsLevel2Memberus-gaap:USStatesAndPoliticalSubdivisionsMember2026-03-310000796534us-gaap:CommercialRealEstatePortfolioSegmentMemberus-gaap:FinancialAssetNotPastDueMembernksh:CommercialRealEstateOwnerOccupiedMember2026-03-310000796534nksh:IndividuallyEvaluatedMembernksh:RealEstateConstructionPortfolioSegmentMember2026-03-310000796534us-gaap:UnfundedLoanCommitmentMember2025-03-310000796534nksh:IndividuallyEvaluatedMemberus-gaap:CommercialRealEstatePortfolioSegmentMember2026-03-310000796534us-gaap:PensionPlansDefinedBenefitMember2026-01-012026-03-310000796534us-gaap:CommercialRealEstatePortfolioSegmentMember2024-12-310000796534nksh:FinancingReceivables30To89DaysPastDueMembernksh:ConsumerRealEstatePortfolioSegmentMembernksh:EquityLinesMember2026-03-310000796534us-gaap:AccumulatedOtherComprehensiveIncomeMember2026-01-012026-03-310000796534us-gaap:CollateralPledgedMemberus-gaap:CommercialRealEstatePortfolioSegmentMembernksh:CommercialRealEstateOtherMember2026-03-310000796534nksh:ConsumerRealEstatePortfolioSegmentMembernksh:ClosedEndFirstLiensMember2026-03-310000796534us-gaap:FairValueInputsLevel3Memberus-gaap:USGovernmentAgenciesDebtSecuritiesMember2025-12-310000796534nksh:IndividuallyEvaluatedMembernksh:ConsumerRealEstatePortfolioSegmentMember2025-12-310000796534nksh:ConsumerRealEstatePortfolioSegmentMembernksh:MultifamilyRealEstateMemberus-gaap:PassMember2025-12-310000796534us-gaap:FairValueInputsLevel3Member2026-03-310000796534us-gaap:PassMember2025-12-310000796534nksh:ClosedEndJuniorLiensMembernksh:ConsumerRealEstatePortfolioSegmentMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember2026-03-310000796534us-gaap:MortgageBackedSecuritiesMember2026-03-310000796534us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember2026-03-310000796534nksh:FinancingReceivables30To89DaysPastDueMembernksh:PublicSectorAndIDAPortfolioSegmentMember2026-03-310000796534nksh:ConsumerRealEstatePortfolioSegmentMembernksh:ClosedEndFirstLiensMembernksh:ClassifiedExcludingImpairedMember2026-03-310000796534nksh:IndividuallyEvaluatedMembernksh:ConsumerNonRealEstatePortfolioSegmentMember2025-12-310000796534us-gaap:UnfundedLoanCommitmentMember2026-01-012026-03-310000796534us-gaap:CreditAndDebitCardMember2025-01-012025-03-310000796534nksh:ConsumerRealEstatePortfolioSegmentMembernksh:CommercialRealEstateOtherMembernksh:ClassifiedExcludingImpairedMember2025-12-310000796534nksh:IndividuallyEvaluatedMember2025-12-310000796534nksh:RestrictedStockAwardsAndRestrictedStockUnitsMember2026-03-310000796534us-gaap:FinancialAssetNotPastDueMembernksh:CommercialAndIndustrialMembernksh:CommercialNonRealEstateSegmentMember2026-03-310000796534nksh:ConsumerNonRealEstatePortfolioSegmentMemberus-gaap:FinancialAssetNotPastDueMemberus-gaap:CreditCardReceivablesMember2025-12-310000796534us-gaap:CommonStockIncludingAdditionalPaidInCapitalMember2026-01-012026-03-310000796534us-gaap:RetainedEarningsMember2025-03-310000796534us-gaap:CommercialRealEstatePortfolioSegmentMemberus-gaap:FinancialAssetNotPastDueMembernksh:MultifamilyRealEstateMember2026-03-310000796534nksh:IndividuallyEvaluatedMember2026-03-310000796534us-gaap:CollateralPledgedMember2026-03-310000796534nksh:OtherConsumerLoansMembernksh:ConsumerNonRealEstatePortfolioSegmentMembernksh:ClassifiedExcludingImpairedMember2026-03-310000796534us-gaap:PassMembernksh:RealEstateConstructionPortfolioSegmentMembernksh:ConstructionResidentialMember2026-03-310000796534us-gaap:SpecialMentionMembernksh:CommercialAndIndustrialMembernksh:CommercialNonRealEstateSegmentMember2025-12-310000796534us-gaap:USGovernmentAgenciesDebtSecuritiesMember2025-12-310000796534nksh:FinancingReceivables30To89DaysPastDueMembernksh:CommercialAndIndustrialMembernksh:CommercialNonRealEstateSegmentMember2025-12-310000796534nksh:FinancingReceivables30To89DaysPastDueMembernksh:RealEstateConstructionPortfolioSegmentMembernksh:ConstructionOtherMember2025-12-310000796534nksh:CommercialAndIndustrialMembernksh:CommercialNonRealEstateSegmentMembernksh:ClassifiedExcludingImpairedMember2025-12-310000796534nksh:PublicSectorAndIDAPortfolioSegmentMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember2026-03-310000796534us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2025-12-310000796534nksh:ClosedEndJuniorLiensMembernksh:ConsumerRealEstatePortfolioSegmentMemberus-gaap:PassMember2025-12-310000796534us-gaap:FinancialAssetNotPastDueMember2026-03-310000796534us-gaap:CreditAndDebitCardMember2026-01-012026-03-310000796534us-gaap:USGovernmentAgenciesDebtSecuritiesMemberus-gaap:FairValueInputsLevel1Member2026-03-310000796534us-gaap:PassMember2026-03-310000796534us-gaap:RetainedEarningsMember2026-01-012026-03-310000796534nksh:FinancingReceivables30To89DaysPastDueMembernksh:ConsumerRealEstatePortfolioSegmentMembernksh:ClosedEndFirstLiensMember2025-12-310000796534us-gaap:RetainedEarningsMember2026-03-310000796534nksh:FinancingReceivables30To89DaysPastDueMember2026-03-310000796534us-gaap:CommercialRealEstatePortfolioSegmentMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMembernksh:CommercialRealEstateOtherMember2026-03-310000796534us-gaap:USGovernmentAgenciesDebtSecuritiesMemberus-gaap:FairValueInputsLevel2Member2025-12-310000796534us-gaap:FairValueInputsLevel3Memberus-gaap:USStatesAndPoliticalSubdivisionsMember2025-12-310000796534nksh:ConsumerRealEstatePortfolioSegmentMember2025-01-012025-03-310000796534nksh:FinancingReceivables30To89DaysPastDueMembernksh:ConsumerRealEstatePortfolioSegmentMembernksh:EquityLinesMember2025-12-310000796534nksh:ConsumerRealEstatePortfolioSegmentMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMembernksh:EquityLinesMember2026-03-310000796534nksh:InvestorOwnedResidentialRealEstateMembernksh:ConsumerRealEstatePortfolioSegmentMembernksh:ClassifiedExcludingImpairedMember2025-12-310000796534nksh:FinancingReceivables30To89DaysPastDueMemberus-gaap:CommercialRealEstatePortfolioSegmentMembernksh:CommercialRealEstateOtherMember2025-12-310000796534us-gaap:FairValueInputsLevel2Memberus-gaap:USGovernmentAgenciesDebtSecuritiesMember2026-03-310000796534nksh:PublicSectorAndIDAPortfolioSegmentMemberus-gaap:FinancialAssetNotPastDueMember2025-12-310000796534nksh:CollectivelyEvaluatedMember2026-03-310000796534nksh:OtherConsumerLoansMembernksh:ConsumerNonRealEstatePortfolioSegmentMemberus-gaap:PassMember2026-03-310000796534us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2024-12-310000796534us-gaap:FairValueInputsLevel1Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2026-03-310000796534nksh:ClosedEndJuniorLiensMembernksh:ConsumerRealEstatePortfolioSegmentMemberus-gaap:FinancialAssetNotPastDueMember2026-03-310000796534us-gaap:FairValueInputsLevel2Memberus-gaap:CorporateDebtSecuritiesMember2026-03-310000796534us-gaap:PassMembernksh:RealEstateConstructionPortfolioSegmentMembernksh:ConstructionOtherMember2026-03-310000796534us-gaap:CommercialRealEstatePortfolioSegmentMembernksh:CommercialRealEstateOwnerOccupiedMembernksh:ClassifiedExcludingImpairedMember2025-12-310000796534nksh:ConsumerRealEstatePortfolioSegmentMembernksh:ClosedEndFirstLiensMemberus-gaap:PassMember2026-03-310000796534us-gaap:RetainedEarningsMember2025-12-310000796534nksh:OtherConsumerLoansMembernksh:ConsumerNonRealEstatePortfolioSegmentMemberus-gaap:FinancialAssetNotPastDueMember2026-03-310000796534nksh:OtherConsumerLoansMembernksh:ConsumerNonRealEstatePortfolioSegmentMember2025-12-310000796534us-gaap:FairValueInputsLevel1Memberus-gaap:USStatesAndPoliticalSubdivisionsMember2026-03-310000796534us-gaap:RetainedEarningsMember2025-01-012025-03-310000796534nksh:CommercialAndIndustrialMembernksh:CommercialNonRealEstateSegmentMember2025-12-3100007965342025-12-310000796534nksh:FinancingReceivables30To89DaysPastDueMembernksh:ClosedEndJuniorLiensMembernksh:ConsumerRealEstatePortfolioSegmentMember2026-03-310000796534us-gaap:MortgageBackedSecuritiesMemberus-gaap:FairValueInputsLevel1Member2025-12-310000796534us-gaap:FairValueInputsLevel2Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2025-12-310000796534nksh:RealEstateConstructionPortfolioSegmentMember2025-01-012025-03-310000796534us-gaap:PassMembernksh:RealEstateConstructionPortfolioSegmentMembernksh:ConstructionOtherMember2025-12-310000796534nksh:ConsumerNonRealEstatePortfolioSegmentMember2025-12-310000796534nksh:InvestorOwnedResidentialRealEstateMembernksh:ConsumerRealEstatePortfolioSegmentMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember2025-12-310000796534nksh:AcquiredLoansMember2026-03-310000796534us-gaap:MortgageBackedSecuritiesMemberus-gaap:FairValueInputsLevel1Member2026-03-310000796534nksh:ConsumerNonRealEstatePortfolioSegmentMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMemberus-gaap:CreditCardReceivablesMember2026-03-310000796534nksh:ClosedEndJuniorLiensMembernksh:ConsumerRealEstatePortfolioSegmentMemberus-gaap:FinancialAssetNotPastDueMember2025-12-310000796534us-gaap:USStatesAndPoliticalSubdivisionsMember2025-12-310000796534nksh:OtherConsumerLoansMembernksh:ConsumerNonRealEstatePortfolioSegmentMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember2026-03-310000796534us-gaap:CommercialRealEstatePortfolioSegmentMembernksh:MultifamilyRealEstateMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember2025-12-310000796534nksh:ConsumerNonRealEstatePortfolioSegmentMemberus-gaap:CreditCardReceivablesMember2025-12-310000796534nksh:ConsumerRealEstatePortfolioSegmentMemberus-gaap:FinancialAssetNotPastDueMembernksh:ClosedEndFirstLiensMember2025-12-310000796534nksh:PublicSectorAndIDAPortfolioSegmentMember2026-01-012026-03-310000796534us-gaap:UnfundedLoanCommitmentMember2025-01-012025-03-310000796534us-gaap:CommercialRealEstatePortfolioSegmentMembernksh:CommercialRealEstateOwnerOccupiedMembernksh:ClassifiedExcludingImpairedMember2026-03-310000796534nksh:ConsumerNonRealEstatePortfolioSegmentMembernksh:CollectivelyEvaluatedMember2025-12-310000796534nksh:ConsumerRealEstatePortfolioSegmentMembernksh:CollectivelyEvaluatedMember2026-03-310000796534nksh:ConsumerNonRealEstatePortfolioSegmentMembernksh:CollectivelyEvaluatedMember2026-03-310000796534us-gaap:DepositAccountMember2026-01-012026-03-310000796534nksh:PublicSectorAndIDAPortfolioSegmentMember2025-01-012025-03-310000796534us-gaap:FairValueInputsLevel3Memberus-gaap:CorporateDebtSecuritiesMember2025-12-310000796534us-gaap:CommercialRealEstatePortfolioSegmentMemberus-gaap:PassMembernksh:CommercialRealEstateOwnerOccupiedMember2026-03-310000796534us-gaap:CommercialRealEstatePortfolioSegmentMember2025-01-012025-12-310000796534us-gaap:CommercialRealEstatePortfolioSegmentMembernksh:MultifamilyRealEstateMember2026-03-3100007965342026-01-012026-03-310000796534nksh:ClosedEndJuniorLiensMembernksh:ConsumerRealEstatePortfolioSegmentMemberus-gaap:PassMember2026-03-310000796534us-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember2026-03-310000796534nksh:Construction14FamilyResidentialMembernksh:RealEstateConstructionPortfolioSegmentMember2026-03-310000796534nksh:IndividuallyEvaluatedMembernksh:ConsumerRealEstatePortfolioSegmentMember2026-03-310000796534nksh:Construction14FamilyResidentialMemberus-gaap:FinancialAssetNotPastDueMembernksh:RealEstateConstructionPortfolioSegmentMember2026-03-310000796534nksh:CommercialNonRealEstateSegmentMember2026-01-012026-03-310000796534nksh:IndividuallyEvaluatedMembernksh:PublicSectorAndIDAPortfolioSegmentMember2025-12-310000796534nksh:InvestorOwnedResidentialRealEstateMembernksh:ConsumerRealEstatePortfolioSegmentMemberus-gaap:FinancialAssetNotPastDueMember2026-03-310000796534us-gaap:CommercialRealEstatePortfolioSegmentMember2025-01-012025-03-310000796534nksh:FinancingReceivables30To89DaysPastDueMemberus-gaap:CommercialRealEstatePortfolioSegmentMembernksh:MultifamilyRealEstateMember2025-12-310000796534nksh:CommercialNonRealEstateSegmentMember2025-01-012025-03-310000796534nksh:ConsumerRealEstatePortfolioSegmentMembernksh:ClosedEndFirstLiensMemberus-gaap:SpecialMentionMember2026-03-310000796534nksh:ConsumerRealEstatePortfolioSegmentMember2024-12-310000796534nksh:InvestorOwnedResidentialRealEstateMembernksh:ConsumerRealEstatePortfolioSegmentMembernksh:ClassifiedExcludingImpairedMember2026-03-310000796534nksh:OtherConsumerLoansMembernksh:ConsumerNonRealEstatePortfolioSegmentMemberus-gaap:PassMember2025-12-310000796534us-gaap:SpecialMentionMember2026-03-310000796534us-gaap:CommercialRealEstatePortfolioSegmentMembernksh:EquityLinesMembernksh:ClassifiedExcludingImpairedMember2025-12-310000796534nksh:ConsumerRealEstateLoansMembernksh:RealEstateConstructionPortfolioSegmentMember2026-03-310000796534nksh:RealEstateConstructionPortfolioSegmentMember2026-03-310000796534nksh:FinancingReceivables30To89DaysPastDueMembernksh:CommercialAndIndustrialMembernksh:CommercialNonRealEstateSegmentMember2026-03-310000796534nksh:CommercialNonRealEstateSegmentMember2026-03-310000796534us-gaap:USGovernmentAgenciesDebtSecuritiesMember2026-03-310000796534nksh:CommercialNonRealEstateSegmentMember2025-01-012025-12-310000796534us-gaap:CollateralPledgedMember2025-12-310000796534nksh:ConsumerRealEstatePortfolioSegmentMembernksh:CollectivelyEvaluatedMember2025-12-310000796534us-gaap:AutomobileLoanMembernksh:ConsumerNonRealEstatePortfolioSegmentMemberus-gaap:FinancialAssetNotPastDueMember2025-12-310000796534nksh:CommercialNonRealEstateSegmentMembernksh:CollectivelyEvaluatedMember2026-03-310000796534nksh:Construction14FamilyResidentialMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMembernksh:RealEstateConstructionPortfolioSegmentMember2026-03-310000796534nksh:IndividuallyEvaluatedMembernksh:CommercialNonRealEstateSegmentMember2026-03-310000796534us-gaap:CommercialRealEstatePortfolioSegmentMemberus-gaap:PassMembernksh:CommercialRealEstateOtherMember2025-12-310000796534nksh:ConsumerNonRealEstatePortfolioSegmentMember2025-01-012025-12-310000796534us-gaap:PassMembernksh:CommercialAndIndustrialMembernksh:CommercialNonRealEstateSegmentMember2026-03-310000796534us-gaap:CommercialMortgageBackedSecuritiesMember2026-03-310000796534us-gaap:CommercialRealEstatePortfolioSegmentMember2025-12-310000796534us-gaap:FinancialAssetNotPastDueMembernksh:PublicSectorAndIDAPortfolioSegmentMember2026-03-310000796534nksh:AcquiredLoansMember2025-12-310000796534us-gaap:CommercialRealEstatePortfolioSegmentMembernksh:CollectivelyEvaluatedMember2026-03-310000796534us-gaap:MortgageBackedSecuritiesMember2025-12-310000796534nksh:OtherConsumerLoansMembernksh:ConsumerNonRealEstatePortfolioSegmentMember2025-01-012025-12-310000796534nksh:ClosedEndJuniorLiensMembernksh:ConsumerRealEstatePortfolioSegmentMember2025-12-310000796534nksh:ConsumerRealEstatePortfolioSegmentMember2026-01-012026-03-310000796534nksh:PublicSectorAndIDAPortfolioSegmentMemberus-gaap:PassMember2026-03-310000796534nksh:FinancingReceivables30To89DaysPastDueMembernksh:ConsumerNonRealEstatePortfolioSegmentMemberus-gaap:CreditCardReceivablesMember2025-12-310000796534us-gaap:ProductAndServiceOtherMember2025-01-012025-03-310000796534nksh:FinancingReceivables30To89DaysPastDueMemberus-gaap:AutomobileLoanMembernksh:ConsumerNonRealEstatePortfolioSegmentMember2025-12-310000796534nksh:ConsumerNonRealEstatePortfolioSegmentMemberus-gaap:CreditCardReceivablesMember2025-01-012025-12-310000796534us-gaap:CommercialRealEstatePortfolioSegmentMembernksh:CommercialRealEstateOwnerOccupiedMember2025-12-310000796534nksh:ConsumerRealEstatePortfolioSegmentMemberus-gaap:FinancialAssetNotPastDueMembernksh:EquityLinesMember2026-03-310000796534us-gaap:CommonStockIncludingAdditionalPaidInCapitalMember2026-03-310000796534nksh:ConsumerRealEstatePortfolioSegmentMembernksh:ClosedEndFirstLiensMemberus-gaap:PassMember2025-12-310000796534us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember2024-12-310000796534nksh:InvestorOwnedResidentialRealEstateMembernksh:ConsumerRealEstatePortfolioSegmentMember2026-03-310000796534us-gaap:AccumulatedOtherComprehensiveIncomeMember2025-03-310000796534us-gaap:AccumulatedOtherComprehensiveIncomeMember2026-03-310000796534nksh:StockIncentivePlan2023Member2023-05-090000796534nksh:Construction14FamilyResidentialMembernksh:FinancingReceivables30To89DaysPastDueMembernksh:RealEstateConstructionPortfolioSegmentMember2026-03-310000796534us-gaap:CommercialRealEstatePortfolioSegmentMemberus-gaap:FinancialAssetNotPastDueMembernksh:CommercialRealEstateOtherMember2026-03-310000796534nksh:InvestorOwnedResidentialRealEstateMembernksh:ConsumerRealEstatePortfolioSegmentMember2025-12-310000796534nksh:OtherConsumerLoansMembernksh:ConsumerNonRealEstatePortfolioSegmentMember2026-01-012026-03-310000796534nksh:Construction14FamilyResidentialMembernksh:FinancingReceivables30To89DaysPastDueMembernksh:RealEstateConstructionPortfolioSegmentMember2025-12-310000796534nksh:PublicSectorAndIDAPortfolioSegmentMember2025-12-310000796534nksh:OtherConsumerLoansMembernksh:ConsumerNonRealEstatePortfolioSegmentMemberus-gaap:FinancialAssetNotPastDueMember2025-12-310000796534us-gaap:CarryingReportedAmountFairValueDisclosureMember2025-12-310000796534us-gaap:FairValueInputsLevel2Member2026-03-310000796534nksh:IndividuallyEvaluatedMembernksh:RealEstateConstructionPortfolioSegmentMember2025-12-310000796534nksh:InvestorOwnedResidentialRealEstateMembernksh:ConsumerRealEstatePortfolioSegmentMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember2026-03-310000796534nksh:RealEstateConstructionPortfolioSegmentMembernksh:CollectivelyEvaluatedMember2026-03-310000796534nksh:ConsumerNonRealEstatePortfolioSegmentMemberus-gaap:CreditCardReceivablesMember2026-01-012026-03-310000796534us-gaap:AccumulatedOtherComprehensiveIncomeMember2025-12-310000796534us-gaap:CommercialRealEstatePortfolioSegmentMembernksh:CommercialAndIndustrialMember2025-12-310000796534us-gaap:FairValueMeasurementsNonrecurringMemberus-gaap:ChangeDuringPeriodFairValueDisclosureMembernksh:LoansHeldForSaleMember2026-01-012026-03-310000796534us-gaap:CommercialRealEstatePortfolioSegmentMembernksh:MultifamilyRealEstateMember2025-12-310000796534us-gaap:CoreDepositsMember2025-01-012025-03-310000796534us-gaap:AutomobileLoanMembernksh:ConsumerNonRealEstatePortfolioSegmentMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember2025-12-310000796534us-gaap:CollateralPledgedMemberus-gaap:CommercialRealEstatePortfolioSegmentMembernksh:CommercialRealEstateOwnerOccupiedMember2026-03-310000796534us-gaap:CommercialRealEstatePortfolioSegmentMemberus-gaap:SpecialMentionMembernksh:CommercialRealEstateOwnerOccupiedMember2026-03-310000796534us-gaap:CommercialRealEstatePortfolioSegmentMember2026-01-012026-03-310000796534us-gaap:PensionPlansDefinedBenefitMember2025-01-012025-03-310000796534us-gaap:CarryingReportedAmountFairValueDisclosureMember2026-03-310000796534us-gaap:FiduciaryAndTrustMember2025-01-012025-03-310000796534nksh:Construction14FamilyResidentialMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMembernksh:RealEstateConstructionPortfolioSegmentMember2025-12-310000796534us-gaap:CommonStockIncludingAdditionalPaidInCapitalMember2025-01-012025-03-310000796534us-gaap:FairValueInputsLevel3Memberus-gaap:MortgageBackedSecuritiesMember2025-12-310000796534nksh:RestrictedStockAwardsAndRestrictedStockUnitsMember2026-01-012026-03-3100007965342025-03-310000796534nksh:ConsumerRealEstatePortfolioSegmentMember2026-03-310000796534nksh:FinancingReceivables30To89DaysPastDueMemberus-gaap:CommercialRealEstatePortfolioSegmentMembernksh:CommercialRealEstateOwnerOccupiedMember2025-12-310000796534us-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember2025-12-310000796534nksh:InsuranceAndInvestmentMember2026-01-012026-03-310000796534us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember2025-01-012025-03-310000796534us-gaap:AutomobileLoanMembernksh:ConsumerNonRealEstatePortfolioSegmentMember2026-03-31nksh:Loansiso4217:USDxbrli:sharesxbrli:purexbrli:sharesnksh:Securitiesiso4217:USD\n\n[Table of Contents](#toc_page)\n\nUNITED STATES\n\nSECURITIES AND EXCHANGE COMMISSION\n\nWashington, D.C. 20549\n\nFORM 10-Q\n\n \n\n☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934\n\nFor the quarterly period ended March 31, 2026\n\n☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934\n\nFor the transition period from ________ to ________\n\n \n\nCommission File Number: 0-15204\n\nNATIONAL BANKSHARES, INC.\n\n(Exact name of registrant as specified in its charter)\n\n \n\nVirginia\n\n54-1375874\n\n(State or other jurisdiction of incorporation or organization)\n\n(I.R.S. Employer Identification No.)\n\n \n\n101 Hubbard Street\n\nBlacksburg, Virginia 24062-9002\n\n(Address of principal executive offices) (Zip Code)\n\n(540) 951-6300\n\n(Registrant’s telephone number, including area code)\n\n(Not applicable)\n\n(Former name, former address and former fiscal year, if changed since last report)\n\nSecurities registered pursuant to Section 12(b) of the Act:\n\n \n\nTitle of each class\n\nTrading Symbol(s)\n\nName of each exchange on which registered\n\nCommon Stock, par value $1.25 per share\n\nNKSH\n\nNasdaq Capital Market\n\n \n\nIndicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. ☒ Yes ☐ No\n\nIndicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files). ☒ Yes ☐ No\n\nIndicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b–2 of the Exchange Act.\n\n \n\nLarge accelerated filer ☐\n\nAccelerated filer ☐\n\nNon-accelerated filer ☒\n\nSmaller reporting company ☒\n\nEmerging growth company ☐\n\n \n\nIf an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐\n\nIndicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). Yes ☐ No ☒\n\nIndicate the number of shares outstanding of each of the issuer’s classes of common stock, as of the latest practicable date.\n\n \n\nOutstanding shares of common stock at May 13, 2026\n\n6,368,410\n\n \n\n \n\n[Table of Contents](#toc_page)\n\nNATIONAL BANKSHARES, INC.\n\nForm 10-Q\n\nIndex\n\n \n\n[Part I – Financial Information](#part_i)\n\nPage"}