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Loans Receivable and Allowance for Loan Losses (Narrative) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and Leases Receivable, Impaired, Interest Lost on Nonaccrual Loans | $ 451 us-gaap_LoansAndLeasesReceivableImpairedInterestLostOnNonaccrualLoans | $ 724 us-gaap_LoansAndLeasesReceivableImpairedInterestLostOnNonaccrualLoans | $ 666 us-gaap_LoansAndLeasesReceivableImpairedInterestLostOnNonaccrualLoans
Loans and Leases Receivable, Gross | 501,534 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount | 503,577 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount |
Financing Receivable, Allowance for Credit Losses, Write-downs | 1,546 us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs | 2,225 us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs | 2,437 us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs
Gross Realized Gains on Loans | 150 nwfl_GrossRealizedGainsOnLoans | 74 nwfl_GrossRealizedGainsOnLoans | 270 nwfl_GrossRealizedGainsOnLoans
Gross Realized Losses on Loans | 0 nwfl_GrossRealizedLossesOnLoans | 7 nwfl_GrossRealizedLossesOnLoans | 0 nwfl_GrossRealizedLossesOnLoans
Proceeds from Sale of Mortgage Loans Held-for-sale | 4,419 us-gaap_ProceedsFromSaleOfMortgageLoansHeldForSale | 4,053 us-gaap_ProceedsFromSaleOfMortgageLoansHeldForSale | 7,175 us-gaap_ProceedsFromSaleOfMortgageLoansHeldForSale
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down | 293 us-gaap_FinancingReceivablesImpairedTroubledDebtRestructuringWriteDown | 53 us-gaap_FinancingReceivablesImpairedTroubledDebtRestructuringWriteDown |
Customer Concentration Risk [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Allowance for Credit Losses, Write-downs | 422 us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember | 0 us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember | 0 us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember
Hospitality Lodging Industry [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and Leases Receivable, Gross | 35,700 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_ConcentrationRiskByTypeAxis = nwfl_HospitalityLodgingIndustryMember |  |
Concentration Risk, Percentage | 39.80%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByTypeAxis = nwfl_HospitalityLodgingIndustryMember |  |
Property Owners' Associations [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and Leases Receivable, Gross | 13,800 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_ConcentrationRiskByTypeAxis = nwfl_PropertyOwnersAssociationsMember |  |
Concentration Risk, Percentage | 15.40%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByTypeAxis = nwfl_PropertyOwnersAssociationsMember |  |
Automobile Dealers [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and Leases Receivable, Gross | 12,200 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_ConcentrationRiskByTypeAxis = nwfl_AutomobileDealersMember |  |
Concentration Risk, Percentage | 13.60%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByTypeAxis = nwfl_AutomobileDealersMember |  |
Troubled Debt Restructured Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Allowance for Credit Losses, Write-downs | 573 us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = nwfl_TroubledDebtRestructuredLoansMember |  |
Impaired Loans Not Requiring an Allowance [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Allowance for Credit Losses, Write-downs | 158 us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs / us-gaap_FairValueByAssetClassAxis = nwfl_ImpairedLoansNotRequiringAllowanceMember | 3,714 us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs / us-gaap_FairValueByAssetClassAxis = nwfl_ImpairedLoansNotRequiringAllowanceMember |
Impaired Loans Requiring an Allowance [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Allowance for Credit Losses, Write-downs | $ 864 us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs / us-gaap_FairValueByAssetClassAxis = nwfl_ImpairedLoansRequiringAllowanceMember | $ 0 us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs / us-gaap_FairValueByAssetClassAxis = nwfl_ImpairedLoansRequiringAllowanceMember |

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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13537-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6404-108592 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13531-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6351-108592 + Details
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- Definition Amount of direct write-downs of financing receivables charged against the allowance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524 + Details
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- Definition Reflects the amount of the write-down related to a troubled debt restructuring. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=25495931&loc=d3e18845-111554 + Details
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- Definition Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4428-111522 + Details
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- Definition Reflects the amount of additional interest income that would have been recorded if impaired or nonperforming loans were instead current, in compliance with their original terms, and outstanding throughout the reporting period or since origination (if held for part of the period). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25495931&loc=d3e18794-111554 + Details
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- Definition The cash inflow from sales of loans that are secured with real estate mortgages and are held with the intention to resell in the near future. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 21 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3461-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3536-108585 + Details
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