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Loans Receivable and Allowance for Loan Losses (Components of Purchase Accounting Adjustments) (Details) - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016 | Jul. 31, 2016
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Loans Receivable and Allowance for Loan Losses [Abstract] |  |  |
Contractually required principal and interest |  |  | $ 2,621
Non-accretable discount |  |  | (1,014)
Expected cash flows |  |  | 1,607
Accretable discount |  |  | (239)
Estimated fair value | $ 1,345 | $ 1,386 | $ 1,368

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- Definition Accretable discount of acquired impaired loans. + References No definition available. + Details
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Namespace Prefix: | nwfl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Contractually required principal and interest of acquired impaired loans. + References No definition available. + Details
Name: | nwfl_ContractuallyRequiredPrincipalAndInterest
Namespace Prefix: | nwfl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Expected cash flows from acquired impaired loans. + References No definition available. + Details
Name: | nwfl_ExpectedCashFlows
Namespace Prefix: | nwfl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Non-accretable discount related to acquired impaired loans. + References No definition available. + Details
Name: | nwfl_NonAccretableDiscount
Namespace Prefix: | nwfl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The recorded balance, net of any applicable reductions (for example, unamortized accretable yield and other-than-temporary impairments), for loans 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 is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable. + 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)(1) -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 + Details
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Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration