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Fair Value Measurements and Fair Value of Financial Instruments (Additional Qualitative Information about Level 3 Assets) (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
loan
Dec. 31, 2013
loan
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired Financing Receivable, Recorded Investment $ 11,605,000us-gaap_ImpairedFinancingReceivableRecordedInvestment $ 12,609,000us-gaap_ImpairedFinancingReceivableRecordedInvestment
Number of impaired loans requiring a valuation allowance 3nwfl_NumberOfImpairedLoansRequiringValuationAllowance 1nwfl_NumberOfImpairedLoansRequiringValuationAllowance
Impaired Financing Receivable, with Related Allowance, Recorded Investment 2,973,000us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment 1,723,000us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment
Impaired Financing Receivable, Related Allowance 293,000us-gaap_ImpairedFinancingReceivableRelatedAllowance 53,000us-gaap_ImpairedFinancingReceivableRelatedAllowance
Number of impaired loans not requiring a valuation allowance 14nwfl_NumberOfImpairedLoansNotRequiringValuationAllowance 20nwfl_NumberOfImpairedLoansNotRequiringValuationAllowance
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 8,632,000us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment 10,886,000us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment
Impaired Loans, Cumulative Charge-Offs 1,022,000nwfl_ImpairedLoansCumulativeChargeOffs 3,714,000nwfl_ImpairedLoansCumulativeChargeOffs
Investment Owned, at Fair Value 11,605,000us-gaap_InvestmentOwnedAtFairValue 12,556,000us-gaap_InvestmentOwnedAtFairValue
Impaired Loans [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, Fair Value Disclosure, Nonrecurring 11,312,000us-gaap_AssetsFairValueDisclosureNonrecurring
/ us-gaap_FairValueByAssetClassAxis
= nwfl_ImpairedLoansMember		 12,556,000us-gaap_AssetsFairValueDisclosureNonrecurring
/ us-gaap_FairValueByAssetClassAxis
= nwfl_ImpairedLoansMember
Fair Value Measurements, Valuation Techniques Appraisal of collateral(1) [1] Appraisal of collateral(1) [1]
Fair Value Disclosure, Unbservable Input Range Appraisal adjustments(2) [2] Appraisal adjustments(2) [2]
Impaired Loans [Member] | Minimum [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value Inputs, Discount Rate 6.00%us-gaap_FairValueInputsDiscountRate
/ us-gaap_FairValueByAssetClassAxis
= nwfl_ImpairedLoansMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		 10.00%us-gaap_FairValueInputsDiscountRate
/ us-gaap_FairValueByAssetClassAxis
= nwfl_ImpairedLoansMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Impaired Loans [Member] | Maximum [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value Inputs, Discount Rate 33.00%us-gaap_FairValueInputsDiscountRate
/ us-gaap_FairValueByAssetClassAxis
= nwfl_ImpairedLoansMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		 15.00%us-gaap_FairValueInputsDiscountRate
/ us-gaap_FairValueByAssetClassAxis
= nwfl_ImpairedLoansMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Impaired Loans [Member] | Weighted Average [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value Inputs, Discount Rate 22.35%us-gaap_FairValueInputsDiscountRate
/ us-gaap_FairValueByAssetClassAxis
= nwfl_ImpairedLoansMember
/ us-gaap_RangeAxis
= us-gaap_WeightedAverageMember		 10.67%us-gaap_FairValueInputsDiscountRate
/ us-gaap_FairValueByAssetClassAxis
= nwfl_ImpairedLoansMember
/ us-gaap_RangeAxis
= us-gaap_WeightedAverageMember
Foreclosed Real Estate Owned [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, Fair Value Disclosure, Nonrecurring $ 3,726,000us-gaap_AssetsFairValueDisclosureNonrecurring
/ us-gaap_FairValueByAssetClassAxis
= nwfl_OtherRealEstateOwnedMember		 $ 1,009,000us-gaap_AssetsFairValueDisclosureNonrecurring
/ us-gaap_FairValueByAssetClassAxis
= nwfl_OtherRealEstateOwnedMember
Fair Value Measurements, Valuation Techniques Appraisal of collateral(1) [1] Appraisal of collateral(1) [1]
Fair Value Disclosure, Unbservable Input Range Liquidation Expenses(2) [2] Liquidation Expenses(2) [2]
Fair Value Inputs, Discount Rate 10.00%us-gaap_FairValueInputsDiscountRate
/ us-gaap_FairValueByAssetClassAxis
= nwfl_OtherRealEstateOwnedMember		 10.00%us-gaap_FairValueInputsDiscountRate
/ us-gaap_FairValueByAssetClassAxis
= nwfl_OtherRealEstateOwnedMember
[1] Fair value is generally determined through independent appraisals of the underlying collateral, which generally include various level 3 inputs which are not identifiable, less any associated allowance.
[2] Appraisals may be adjusted by management for qualitative factors such as economic conditions and estimated liquidation expenses. The range and weighted average of liquidation expenses and other appraisal adjustments are presented as a percent of the appraisal.