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Loans Receivable and Allowance for Loan Losses (Impaired Loans Acquired in North Penn Acquisition) (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | May 31, 2011
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Accretable discount | $ 8 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield | $ 20 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield | $ 76 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield | $ 171 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield |
North Penn Bancorp, Inc. [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Unpaid principal balance |  |  |  |  | 1,936 nwfl_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesAcquiredDuringPeriodUnpaidPrincipalBalance / us-gaap_BusinessAcquisitionAxis = nwfl_NorthPennBancorpIncMember
Interest |  |  |  |  | 1,669 nwfl_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesAcquiredDuringPeriodInterest / us-gaap_BusinessAcquisitionAxis = nwfl_NorthPennBancorpIncMember
Contractual cash flows |  |  |  |  | 3,605 us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesAcquiredDuringPeriodContractuallyRequiredPaymentsReceivableAtAcquisition / us-gaap_BusinessAcquisitionAxis = nwfl_NorthPennBancorpIncMember
Non-accretable discount |  |  |  |  | (1,724)us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAcquiredDuringPeriodNotAccountedForUsingIncomeRecognitionModelAtAcquisition / us-gaap_BusinessAcquisitionAxis = nwfl_NorthPennBancorpIncMember
Expected cash flows |  |  |  |  | 1,881 us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesAcquiredDuringPeriodCashFlowsExpectedToBeCollectedAtAcquisition / us-gaap_BusinessAcquisitionAxis = nwfl_NorthPennBancorpIncMember
Accretable discount |  |  |  |  | (329)us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield / us-gaap_BusinessAcquisitionAxis = nwfl_NorthPennBancorpIncMember
Estimated fair value |  |  |  |  | $ 1,552 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAcquiredDuringPeriodAtAcquisitionAtFairValue / us-gaap_BusinessAcquisitionAxis = nwfl_NorthPennBancorpIncMember

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- Definition Certain Loans Acquired in Transfer Accounted for as Debt Securities, Acquired During Period, Interest + References No definition available. + Details
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- Definition Certain Loans Acquired in Transfer Accounted for as Debt Securities, Acquired During Period, Unpaid Principal Balance + References No definition available. + Details
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- Definition Amount of cash flows expected to be collected at acquisition of acquired loans accounted for as debt securities with evidence of deterioration of credit quality. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=27045933&loc=d3e13503-111538 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 + Details
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- Definition Amount of contractually required payments receivable at acquisition of acquired loans accounted for as debt securities with evidence of deterioration of credit quality. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=27045933&loc=d3e13503-111538 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 + Details
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- Definition Amount of the excess of a loan's cash flows expected to be collected over the investor's initial investment in acquired loans not accounted for as debt securities with evidence of deterioration of credit quality. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=27045933&loc=d3e13503-111538 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 + Details
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- Definition Fair value at acquisition of acquired loans not accounted for as debt securities with evidence of deterioration of credit quality. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=27045933&loc=d3e13503-111538 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 + Details
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- Definition The carrying amount as of the acquisition date of loans to which the income recognition total model was not applied. This relates to loans not accounted for as debt securities, with evidence of deterioration of credit quality since origination that were acquired by completion of a transfer, for which it was deemed probable at acquisition that the investor would be unable to collect all contractually required payments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=27045933&loc=d3e13503-111538 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 + Details
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