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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 | $ 11,605,000 us-gaap_ImpairedFinancingReceivableRecordedInvestment |  | $ 12,609,000 us-gaap_ImpairedFinancingReceivableRecordedInvestment |
Number of impaired loans requiring a valuation allowance | 3 nwfl_NumberOfImpairedLoansRequiringValuationAllowance |  | 1 nwfl_NumberOfImpairedLoansRequiringValuationAllowance |
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 2,973,000 us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment |  | 1,723,000 us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment |
Impaired Financing Receivable, Related Allowance | 293,000 us-gaap_ImpairedFinancingReceivableRelatedAllowance |  | 53,000 us-gaap_ImpairedFinancingReceivableRelatedAllowance |
Number of impaired loans not requiring a valuation allowance | 14 nwfl_NumberOfImpairedLoansNotRequiringValuationAllowance |  | 20 nwfl_NumberOfImpairedLoansNotRequiringValuationAllowance |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 8,632,000 us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment |  | 10,886,000 us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment |
Impaired Loans, Cumulative Charge-Offs | 1,022,000 nwfl_ImpairedLoansCumulativeChargeOffs |  | 3,714,000 nwfl_ImpairedLoansCumulativeChargeOffs |
Investment Owned, at Fair Value | 11,605,000 us-gaap_InvestmentOwnedAtFairValue |  | 12,556,000 us-gaap_InvestmentOwnedAtFairValue |
Impaired Loans [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Assets, Fair Value Disclosure, Nonrecurring | 11,312,000 us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_FairValueByAssetClassAxis = nwfl_ImpairedLoansMember |  | 12,556,000 us-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 | $ 3,726,000 us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_FairValueByAssetClassAxis = nwfl_OtherRealEstateOwnedMember |  | $ 1,009,000 us-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.

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- Definition Cumulative amount of charge-offs against impaired financing receivables over their respective lives. + References No definition available. + Details
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- Definition The number of impaired loans during the period for which a valuation allowance was not required due to the estimated realizable value of the collateral exceeding the recorded investment in the loans. + References No definition available. + Details
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- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a nonrecurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References No definition available. + Details
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- Definition Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 14A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953550-111524 + Details
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