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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
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accretable discount	$ 8us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield	$ 20us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield	$ 76us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield	$ 171us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield
North Penn Bancorp, Inc. [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance					1,936nwfl_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesAcquiredDuringPeriodUnpaidPrincipalBalance / us-gaap_BusinessAcquisitionAxis = nwfl_NorthPennBancorpIncMember
Interest					1,669nwfl_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesAcquiredDuringPeriodInterest / us-gaap_BusinessAcquisitionAxis = nwfl_NorthPennBancorpIncMember
Contractual cash flows					3,605us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesAcquiredDuringPeriodContractuallyRequiredPaymentsReceivableAtAcquisition / us-gaap_BusinessAcquisitionAxis = nwfl_NorthPennBancorpIncMember
Non-accretable discount					(1,724)us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAcquiredDuringPeriodNotAccountedForUsingIncomeRecognitionModelAtAcquisition / us-gaap_BusinessAcquisitionAxis = nwfl_NorthPennBancorpIncMember
Expected cash flows					1,881us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesAcquiredDuringPeriodCashFlowsExpectedToBeCollectedAtAcquisition / us-gaap_BusinessAcquisitionAxis = nwfl_NorthPennBancorpIncMember
Accretable discount					(329)us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield / us-gaap_BusinessAcquisitionAxis = nwfl_NorthPennBancorpIncMember
Estimated fair value					$ 1,552us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAcquiredDuringPeriodAtAcquisitionAtFairValue / us-gaap_BusinessAcquisitionAxis = nwfl_NorthPennBancorpIncMember

X

- Definition

Certain Loans Acquired in Transfer Accounted for as Debt Securities, Acquired During Period, Interest

+ References

No definition available.

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- Definition

Certain Loans Acquired in Transfer Accounted for as Debt Securities, Acquired During Period, Unpaid Principal Balance

+ References

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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

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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

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-Publisher FASB

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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

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Fair value at acquisition of acquired loans not accounted for as debt securities with evidence of deterioration of credit quality.

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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.

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