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Risks and Uncertainties (Narrative) (Details) $ in Millions | Dec. 31, 2020 USD ($) item
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Risks and Uncertainties [Abstract] |
Number of applications | item | 1,100
PPP loans | $ | $ 95.0

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- Definition Paycheck Protection Program, Applications + References No definition available. + Details
Name: | nwfl_PaycheckProtectionProgramApplications
Namespace Prefix: | nwfl_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The face amount of financial assets, which are not recognized in the financial statements (off-balance sheet) because they fail to meet some other criterion for recognition. + References No definition available. + Details
Name: | us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountAsset
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant