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

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- 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 + Details
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- 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 + Details
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