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Loans Receivable and Allowance for Loan Losses (Narrative) (Details) (USD $)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Real Estate Acquired Through Foreclosure $ 1,698,000us-gaap_RealEstateAcquiredThroughForeclosure   $ 3,726,000us-gaap_RealEstateAcquiredThroughForeclosure
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Accretable Yield, Period Increase (Decrease) 0us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesAccretableYieldPeriodIncreaseDecrease    
Loans and Leases Receivable, Gross 519,349,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount   501,534,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
Financing Receivable, Allowance for Credit Losses, Write-downs 495,000us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs 415,000us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs  
Gross Realized Losses on Loans 0nwfl_GrossRealizedLossesOnLoans    
Proceeds from Sale of Mortgage Loans Held-for-sale 804,000us-gaap_ProceedsFromSaleOfMortgageLoansHeldForSale 1,151,000us-gaap_ProceedsFromSaleOfMortgageLoansHeldForSale  
Hospitality Lodging Industry [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases Receivable, Gross 34,100,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_ConcentrationRiskByTypeAxis
= nwfl_HospitalityLodgingIndustryMember
   
Hospitality Lodging Industry [Member] | Loans Receivable [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Concentration Risk, Percentage 37.50%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_LoansReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= nwfl_HospitalityLodgingIndustryMember
   
Property Owners' Associations [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases Receivable, Gross 13,200,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_ConcentrationRiskByTypeAxis
= nwfl_PropertyOwnersAssociationsMember
   
Property Owners' Associations [Member] | Loans Receivable [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Concentration Risk, Percentage 14.50%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_LoansReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= nwfl_PropertyOwnersAssociationsMember
   
Automobile Dealers [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases Receivable, Gross 15,100,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_ConcentrationRiskByTypeAxis
= nwfl_AutomobileDealersMember
   
Automobile Dealers [Member] | Loans Receivable [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Concentration Risk, Percentage 16.60%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_LoansReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= nwfl_AutomobileDealersMember
   
Resorts [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases Receivable, Gross 9,600,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_ConcentrationRiskByTypeAxis
= nwfl_ResortsMember
   
Resorts [Member] | Loans Receivable [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Concentration Risk, Percentage 10.60%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_LoansReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= nwfl_ResortsMember
   
Troubled Debt Restructured Loans [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down 373,000us-gaap_FinancingReceivablesImpairedTroubledDebtRestructuringWriteDown
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= nwfl_TroubledDebtRestructuredLoansMember
   
Residential Real Estate Loans [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Real Estate Acquired Through Foreclosure 225,000us-gaap_RealEstateAcquiredThroughForeclosure
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember
   
Mortgage Loans in Process of Foreclosure, Amount 1,055,000nwfl_MortgageLoansInProcessOfForeclosureAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember
   
Loans and Leases Receivable, Gross 157,707,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember
  158,139,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember
Financing Receivable, Allowance for Credit Losses, Write-downs 87,000us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember
75,000us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember
 
Gross Realized Gains on Loans 24,000nwfl_GrossRealizedGainsOnLoans
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember
42,000nwfl_GrossRealizedGainsOnLoans
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember
 
Gross Realized Losses on Loans 0nwfl_GrossRealizedLossesOnLoans
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember
0nwfl_GrossRealizedLossesOnLoans
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember
 
Proceeds from Sale of Mortgage Loans Held-for-sale $ 804,000us-gaap_ProceedsFromSaleOfMortgageLoansHeldForSale
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember
$ 1,200,000us-gaap_ProceedsFromSaleOfMortgageLoansHeldForSale
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember