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Loans Receivable and Allowance for Loan Losses (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Impaired, Interest Lost on Nonaccrual Loans	$ 451us-gaap_LoansAndLeasesReceivableImpairedInterestLostOnNonaccrualLoans	$ 724us-gaap_LoansAndLeasesReceivableImpairedInterestLostOnNonaccrualLoans	$ 666us-gaap_LoansAndLeasesReceivableImpairedInterestLostOnNonaccrualLoans
Loans and Leases Receivable, Gross	501,534us-gaap_LoansAndLeasesReceivableGrossCarryingAmount	503,577us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
Financing Receivable, Allowance for Credit Losses, Write-downs	1,546us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs	2,225us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs	2,437us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs
Gross Realized Gains on Loans	150nwfl_GrossRealizedGainsOnLoans	74nwfl_GrossRealizedGainsOnLoans	270nwfl_GrossRealizedGainsOnLoans
Gross Realized Losses on Loans	0nwfl_GrossRealizedLossesOnLoans	7nwfl_GrossRealizedLossesOnLoans	0nwfl_GrossRealizedLossesOnLoans
Proceeds from Sale of Mortgage Loans Held-for-sale	4,419us-gaap_ProceedsFromSaleOfMortgageLoansHeldForSale	4,053us-gaap_ProceedsFromSaleOfMortgageLoansHeldForSale	7,175us-gaap_ProceedsFromSaleOfMortgageLoansHeldForSale
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	293us-gaap_FinancingReceivablesImpairedTroubledDebtRestructuringWriteDown	53us-gaap_FinancingReceivablesImpairedTroubledDebtRestructuringWriteDown
Customer Concentration Risk [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Allowance for Credit Losses, Write-downs	422us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember	0us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember	0us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember
Hospitality Lodging Industry [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	35,700us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_ConcentrationRiskByTypeAxis = nwfl_HospitalityLodgingIndustryMember
Concentration Risk, Percentage	39.80%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByTypeAxis = nwfl_HospitalityLodgingIndustryMember
Property Owners' Associations [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	13,800us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_ConcentrationRiskByTypeAxis = nwfl_PropertyOwnersAssociationsMember
Concentration Risk, Percentage	15.40%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByTypeAxis = nwfl_PropertyOwnersAssociationsMember
Automobile Dealers [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	12,200us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_ConcentrationRiskByTypeAxis = nwfl_AutomobileDealersMember
Concentration Risk, Percentage	13.60%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByTypeAxis = nwfl_AutomobileDealersMember
Troubled Debt Restructured Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Allowance for Credit Losses, Write-downs	573us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = nwfl_TroubledDebtRestructuredLoansMember
Impaired Loans Not Requiring an Allowance [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Allowance for Credit Losses, Write-downs	158us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs / us-gaap_FairValueByAssetClassAxis = nwfl_ImpairedLoansNotRequiringAllowanceMember	3,714us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs / us-gaap_FairValueByAssetClassAxis = nwfl_ImpairedLoansNotRequiringAllowanceMember
Impaired Loans Requiring an Allowance [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Allowance for Credit Losses, Write-downs	$ 864us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs / us-gaap_FairValueByAssetClassAxis = nwfl_ImpairedLoansRequiringAllowanceMember	$ 0us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs / us-gaap_FairValueByAssetClassAxis = nwfl_ImpairedLoansRequiringAllowanceMember

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Gross Realized Gains on Loans

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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Amount of direct write-downs of financing receivables charged against the allowance.

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Reflects the amount of the write-down related to a troubled debt restructuring.

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Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

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Reflects the amount of additional interest income that would have been recorded if impaired or nonperforming loans were instead current, in compliance with their original terms, and outstanding throughout the reporting period or since origination (if held for part of the period).

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The cash inflow from sales of loans that are secured with real estate mortgages and are held with the intention to resell in the near future.

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