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Risks and Uncertainties (Narrative) (Details) $ in Millions	Sep. 30, 2021 USD ($) loan
Risks and Uncertainties [Abstract]
Number of applications | loan	1,200
PPP loans | $	$ 274.3

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- Definition

Paycheck Protection Program, Applications

+ References

No definition available.

+ Details

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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.

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No definition available.

+ Details

Name:	us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountAsset
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant