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

X

- 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

X

- References

No definition available.

+ Details

Name:	us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- 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