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Borrowings (Short-Term Borrowings) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Short-term Debt [Line Items]
Securities Sold under Agreements to Repurchase	$ 25,695us-gaap_SecuritiesSoldUnderAgreementsToRepurchase	$ 36,500us-gaap_SecuritiesSoldUnderAgreementsToRepurchase
FHLB of Pittsburgh [Member]
Short-term Debt [Line Items]
Line of Credit Facility, Fair Value of Amount Outstanding	$ 0us-gaap_LineOfCreditFacilityFairValueOfAmountOutstanding / us-gaap_LineOfCreditFacilityAxis = nwfl_FhlbOfPittsburghMember	$ 13,414us-gaap_LineOfCreditFacilityFairValueOfAmountOutstanding / us-gaap_LineOfCreditFacilityAxis = nwfl_FhlbOfPittsburghMember

X

- Definition

Fair value of the amount outstanding under the credit facility.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 10

-Subparagraph (a)

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Balance Type:	credit
Period Type:	instant

X

- Definition

Amount, after the effects of master netting arrangements, of funds outstanding borrowed in the form of a security repurchase agreement between the entity and another party for the sale and repurchase of identical or substantially the same securities at a date certain for a specified price. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

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-Section S99

-Paragraph 1

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

-Publisher SEC

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-Number 210

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Period Type: