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Borrowings (Other Borrowings) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Long-term Federal Home Loan Bank Advances	$ 22,200us-gaap_FederalHomeLoanBankAdvancesLongTerm	$ 23,761us-gaap_FederalHomeLoanBankAdvancesLongTerm
Convertible note due July 2015 at 4.34% [Member]
Long-term Federal Home Loan Bank Advances	7,111us-gaap_FederalHomeLoanBankAdvancesLongTerm / us-gaap_DebtInstrumentAxis = nwfl_ConvertibleNoteDueJuly2015At434Member	7,301us-gaap_FederalHomeLoanBankAdvancesLongTerm / us-gaap_DebtInstrumentAxis = nwfl_ConvertibleNoteDueJuly2015At434Member
Debt Instrument, Interest Rate, Stated Percentage	4.34%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = nwfl_ConvertibleNoteDueJuly2015At434Member
Convertible note due January 2017 at 4.71% [Member]
Long-term Federal Home Loan Bank Advances	10,000us-gaap_FederalHomeLoanBankAdvancesLongTerm / us-gaap_DebtInstrumentAxis = nwfl_ConvertibleNoteDueJanuary2017At471Member	10,000us-gaap_FederalHomeLoanBankAdvancesLongTerm / us-gaap_DebtInstrumentAxis = nwfl_ConvertibleNoteDueJanuary2017At471Member
Debt Instrument, Interest Rate, Stated Percentage	4.71%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = nwfl_ConvertibleNoteDueJanuary2017At471Member
Amortizing fixed rate borrowing due January 2018 at 0.91% [Member]
Long-term Federal Home Loan Bank Advances	1,866us-gaap_FederalHomeLoanBankAdvancesLongTerm / us-gaap_DebtInstrumentAxis = nwfl_AmortizingFixedRateBorrowingDueJanuary2018At091Member	2,460us-gaap_FederalHomeLoanBankAdvancesLongTerm / us-gaap_DebtInstrumentAxis = nwfl_AmortizingFixedRateBorrowingDueJanuary2018At091Member
Debt Instrument, Interest Rate, Stated Percentage	0.91%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = nwfl_AmortizingFixedRateBorrowingDueJanuary2018At091Member
Amortizing fixed rate borrowing due December 2018 at 1.425% [Member]
Long-term Federal Home Loan Bank Advances	$ 3,223us-gaap_FederalHomeLoanBankAdvancesLongTerm / us-gaap_DebtInstrumentAxis = nwfl_AmortizingFixedRateBorrowingDueDecember2018At1425Member	$ 4,000us-gaap_FederalHomeLoanBankAdvancesLongTerm / us-gaap_DebtInstrumentAxis = nwfl_AmortizingFixedRateBorrowingDueDecember2018At1425Member
Debt Instrument, Interest Rate, Stated Percentage	1.425%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = nwfl_AmortizingFixedRateBorrowingDueDecember2018At1425Member

X

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(1))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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X

- Definition

Including both current and noncurrent portions, Federal Home Loan Bank borrowings initially due beyond one year or beyond the normal operating cycle if longer.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 470

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.16)

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878



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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Article 9



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 470

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64702-112823

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