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Loans Receivable and Allowance for Loan Losses (Troubled Debt Restructurings) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014 loan	Dec. 31, 2013	Dec. 31, 2012
Troubled Debt Restructuring, Debtor, Subsequent Periods [Line Items]
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 8,800,000us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2	$ 9,200,000us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	293,000us-gaap_FinancingReceivablesImpairedTroubledDebtRestructuringWriteDown	53,000us-gaap_FinancingReceivablesImpairedTroubledDebtRestructuringWriteDown
Gains (Losses) on Sales of Other Real Estate	(920,000)us-gaap_GainsLossesOnSalesOfOtherRealEstate	(347,000)us-gaap_GainsLossesOnSalesOfOtherRealEstate	5,000us-gaap_GainsLossesOnSalesOfOtherRealEstate
Mortgage Loans on Real Estate, Foreclosures		4,700,000us-gaap_MortgageLoansOnRealEstateForeclosures
Mortgage Loans on Real Estate, Number of Foreclosures	2nwfl_MortgageLoansOnRealEstateNumberOfForeclosures
Financing Receivable, Allowance for Credit Losses, Write-downs	1,546,000us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs	2,225,000us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs	2,437,000us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs
Recognized loss on loan identified as troubled debt restructuring in prior period	73,000nwfl_RecognizedLossOnLoanIdentifiedAsTroubledDebtRestructuringInPriorPeriod
Commercial Real Estate Loans [Member]
Troubled Debt Restructuring, Debtor, Subsequent Periods [Line Items]
Financing Receivable, Modifications, Number of Contracts	1us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember	4us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember
Financing Receivable, Modifications, Pre-Modification Recorded Investment	4,914,000us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember
Financing Receivable, Modifications, Post-Modification Recorded Investment	4,914,000us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember	5,100,000us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember
Gains (Losses) on Sales of Other Real Estate	680,000us-gaap_GainsLossesOnSalesOfOtherRealEstate / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember
Troubled Debt Restructured Loans [Member]
Troubled Debt Restructuring, Debtor, Subsequent Periods [Line Items]
Financing Receivable, Allowance for Credit Losses, Write-downs	$ 573,000us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = nwfl_TroubledDebtRestructuredLoansMember

X

- Definition

The number of mortgage loans on real estate which were foreclosed on during the reporting period.

+ References

No definition available.

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- Definition

The amount of loss recognized for loans identified as troubled debt restructuring in prior periods.

+ References

No definition available.

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 11B

-Subparagraph (c)(3)

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- Definition

Number of financing receivables that have been modified by troubled debt restructurings.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

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Post-modification amount of investment in financing receivables modified by troubled debt restructurings.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

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- Definition

Pre-modification amount of investment in financing receivables modified by troubled debt restructurings.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

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-Section 50

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- Definition

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

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 40

-Section 50

-Paragraph 4

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- Definition

The net gain (loss) resulting from sales and other disposals of other real estate owned, increases (decreases) in the valuation allowance for foreclosed real estate, and write-downs of other real estate owned after acquisition or physical possession.

+ References

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