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Income Taxes (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Current Income Tax Expense (Benefit)	$ 2,657us-gaap_CurrentIncomeTaxExpenseBenefit	$ 2,566us-gaap_CurrentIncomeTaxExpenseBenefit	$ 2,612us-gaap_CurrentIncomeTaxExpenseBenefit
Earliest Tax Year [Member] | Internal Revenue Service (IRS) [Member]
Open Tax Year	2008
Earliest Tax Year [Member] | Pennsylvania Department of Revenue [Member]
Open Tax Year	2010
Realized Securities Gain [Member]
Current Income Tax Expense (Benefit)	$ 398us-gaap_CurrentIncomeTaxExpenseBenefit / us-gaap_IncomeStatementLocationAxis = nwfl_RealizedSecuritiesGainMember	$ 300us-gaap_CurrentIncomeTaxExpenseBenefit / us-gaap_IncomeStatementLocationAxis = nwfl_RealizedSecuritiesGainMember	$ 482us-gaap_CurrentIncomeTaxExpenseBenefit / us-gaap_IncomeStatementLocationAxis = nwfl_RealizedSecuritiesGainMember

X

- Definition

Amount of current income tax expense (benefit) pertaining to taxable income (loss) from continuing operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SAB TOPIC 6.I.7)

-URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Current Tax Expense (or Benefit)

-URI http://asc.fasb.org/extlink&oid=6509736



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 9

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(h))

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690



Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 08

-Paragraph h

-Article 4



Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 6

-Section I

-Subsection 7

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Tax year that remains open to examination under enacted tax laws, in CCYY format.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 15

-Subparagraph (e)

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319

+ Details

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Namespace Prefix:	us-gaap_
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Period Type:	duration

X

- Details

Name:	us-gaap_IncomeStatementLocationAxis=nwfl_RealizedSecuritiesGainMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: