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Income Taxes (Narrative) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Current Income Tax Expense (Benefit) | $ 2,657 us-gaap_CurrentIncomeTaxExpenseBenefit | $ 2,566 us-gaap_CurrentIncomeTaxExpenseBenefit | $ 2,612 us-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) | $ 398 us-gaap_CurrentIncomeTaxExpenseBenefit / us-gaap_IncomeStatementLocationAxis = nwfl_RealizedSecuritiesGainMember | $ 300 us-gaap_CurrentIncomeTaxExpenseBenefit / us-gaap_IncomeStatementLocationAxis = nwfl_RealizedSecuritiesGainMember | $ 482 us-gaap_CurrentIncomeTaxExpenseBenefit / us-gaap_IncomeStatementLocationAxis = nwfl_RealizedSecuritiesGainMember

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- 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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