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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
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Loss Contingencies [Line Items] |  |
Financial Instrument Commitments | $ 80,600 us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability | $ 76,788 us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability
Unfunded availability under loan commitments [Member] |  |
Loss Contingencies [Line Items] |  |
Financial Instrument Commitments | 25,951 us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_CommitmentsToExtendCreditMember | 24,728 us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_CommitmentsToExtendCreditMember
Unfunded commitments under lines of credit [Member] |  |
Loss Contingencies [Line Items] |  |
Financial Instrument Commitments | 48,873 us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_LossContingenciesByNatureOfContingencyAxis = nwfl_UnfundedCommitmentsUnderLinesOfCreditMember | 46,360 us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_LossContingenciesByNatureOfContingencyAxis = nwfl_UnfundedCommitmentsUnderLinesOfCreditMember
Standby letters of credit [Member] |  |
Loss Contingencies [Line Items] |  |
Financial Instrument Commitments | $ 5,776 us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_StandbyLettersOfCreditMember | $ 5,700 us-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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