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Consolidated Statements of Income (Parenthetical) | 12 Months Ended
--- | ---
Dec. 31, 2017
Consolidated Statements of Income [Abstract] |
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
Name: | nwfl_CommonStockDividendRatePercentage
Namespace Prefix: | nwfl_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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