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Borrowings (Outstanding Balances and Related Information) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Borrowings [Abstract] |  |
Short-term Debt, Average Outstanding Amount | $ 36,514 us-gaap_ShorttermDebtAverageOutstandingAmount | $ 30,832 us-gaap_ShorttermDebtAverageOutstandingAmount
Short-term Debt, Average Interest Rate During the Year | 0.21%nwfl_ShortTermDebtAverageInterestRateDuringYear | 0.21%nwfl_ShortTermDebtAverageInterestRateDuringYear
Short-term Debt, Maximum Month-end Outstanding Amount | $ 49,634 us-gaap_ShorttermDebtMaximumMonthendOutstandingAmount | $ 49,914 us-gaap_ShorttermDebtMaximumMonthendOutstandingAmount
Short-term Debt, Weighted Average Interest Rate | 0.20%us-gaap_ShortTermDebtWeightedAverageInterestRate | 0.21%us-gaap_ShortTermDebtWeightedAverageInterestRate

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- Definition Reflects the calculation of the average interest rate of short-term debt for the period ended. + References No definition available. + Details
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Namespace Prefix: | nwfl_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration

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- Definition For the form of debt having an initial term of less than one year or less than the normal operating cycle, if longer, average borrowings during the period. + References No definition available. + Details
Name: | us-gaap_ShorttermDebtAverageOutstandingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition For the form of debt having an initial term of less than one year or less than the normal operating cycle, if longer, maximum month-end borrowings during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Industry Guide -Number 3 -Section VII -Subsection 2 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Weighted average interest rate of short-term debt outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19 -Subparagraph b -Article 5 + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant