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Income Taxes (Schedule of Deferred Tax Assets and Liabilties) (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Income Taxes [Abstract] |  |
Deferred tax assets, Allowance for loan losses | $ 1,997 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses | $ 1,941 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses
Deferred tax assets, Deferred compensation | 491 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits | 496 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits
Deferred Tax Assets, Purchase Price Adjustment | 999 nwfl_DeferredTaxAssetsPurchasePriceAdjustment | 1,215 nwfl_DeferredTaxAssetsPurchasePriceAdjustment
Deferred Tax Assets, Other | 201 us-gaap_DeferredTaxAssetsOther | 303 us-gaap_DeferredTaxAssetsOther
Deferred Tax Assets, Foreclosed real estate | 280 nwfl_DeferredTaxAssetsForeclosedRealEstate | 54 nwfl_DeferredTaxAssetsForeclosedRealEstate
Deferred tax assets, Net unrealized loss on securities | 0 us-gaap_DeferredTaxAssetsUnrealizedLossesOnAvailableforSaleSecuritiesGross | 1,337 us-gaap_DeferredTaxAssetsUnrealizedLossesOnAvailableforSaleSecuritiesGross
Deferred Tax Assets, Gross, Total | 3,968 us-gaap_DeferredTaxAssetsGross | 5,346 us-gaap_DeferredTaxAssetsGross
Deferred tax liabilities, Premises and equipment | 265 us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment | 327 us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Deferred tax liablities, Deferred loan fees | 170 us-gaap_DeferredTaxLiabilitiesDeferredExpenseDeferredFinancingCosts | 200 us-gaap_DeferredTaxLiabilitiesDeferredExpenseDeferredFinancingCosts
Deferred tax liabilties, Net unrealized gains on securities | 248 us-gaap_DeferredTaxLiabilitiesInvestments | 0 us-gaap_DeferredTaxLiabilitiesInvestments
Deferred Tax Liabilities, Gross, Total | 683 us-gaap_DeferredIncomeTaxLiabilities | 527 us-gaap_DeferredIncomeTaxLiabilities
Deferred Tax Assets, Net, Total | $ 3,285 us-gaap_DeferredTaxAssetsLiabilitiesNet | $ 4,819 us-gaap_DeferredTaxAssetsLiabilitiesNet

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- Definition Amount of deferred tax liability attributable to taxable temporary differences. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Deferred Tax Liability -URI http://asc.fasb.org/extlink&oid=6510232 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 15 -Subparagraph b(2) -Article 7 + Details
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