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

X

- 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

X

- Details

Name:	us-gaap_DebtDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- 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

X

- 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

Name:	us-gaap_ShorttermDebtMaximumMonthendOutstandingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- 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
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