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Consolidated Statements of Income (Parenthetical)	9 Months Ended
	Sep. 30, 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