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v3.19.1

Nature of Operations (Narrative) (Details) - segment | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Nature of Operations [Abstract] |  |
Number of Reportable Segments | 1 |
Common Stock, Dividend Rate, Percentage |  | 50.00%

X
- Definition The percentage rate used to calculate dividend payments on common stock. + References No definition available. + Details
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Namespace Prefix: | nwfl_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References No definition available. + Details
Name: | us-gaap_NumberOfReportableSegments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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