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Off-Balance Sheet Financial Instruments and Guarantees (Table) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Loss Contingencies [Line Items]
Financial Instrument Commitments	$ 80,600us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability	$ 76,788us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability
Unfunded availability under loan commitments [Member]
Loss Contingencies [Line Items]
Financial Instrument Commitments	25,951us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_CommitmentsToExtendCreditMember	24,728us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_CommitmentsToExtendCreditMember
Unfunded commitments under lines of credit [Member]
Loss Contingencies [Line Items]
Financial Instrument Commitments	48,873us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_LossContingenciesByNatureOfContingencyAxis = nwfl_UnfundedCommitmentsUnderLinesOfCreditMember	46,360us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_LossContingenciesByNatureOfContingencyAxis = nwfl_UnfundedCommitmentsUnderLinesOfCreditMember
Standby letters of credit [Member]
Loss Contingencies [Line Items]
Financial Instrument Commitments	$ 5,776us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_StandbyLettersOfCreditMember	$ 5,700us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_StandbyLettersOfCreditMember

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- Definition

The fair value of financial liabilities, which are not recognized in the financial statements (off-balance sheet) because they fail to meet some other criterion for recognition.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 10

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13433-108611

+ Details

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