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Loans Receivable and Allowance for Loan Losses (Troubled Debt Restructurings) (Details) (USD $) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2014 | Mar. 31, 2013 | Dec. 31, 2013
Loans Receivable and Allowance for Loan Losses [Abstract] |  |  |
New Loans Identified as Troubled Debt Restructurings | $ 0 | $ 0 |
Financing Receivable, Modifications, Recorded Investment | $ 9,100,000 |  | $ 9,200,000

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- Definition Loans Identified as Troubled Debt Restructurings during the period. + References No definition available. + Details
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Namespace Prefix: | nwfl_
Data Type: | xbrli:monetaryItemType
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Period Type: | duration

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- Definition The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings. + 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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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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Balance Type: | na
Period Type: | duration