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Operating Leases (Narrative) (Details)	6 Months Ended
	Jun. 30, 2023 USD ($) item	Jun. 30, 2022 USD ($)
Operating Leases [Abstract]
Number of operating leases | item	7
Lease, Cost | $	$ 362,000	$ 299,000

X

- Definition

Number Of Operating Leases

+ References

No definition available.

+ Details

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Namespace Prefix:	nwfl_
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Period Type:	duration

X

- Definition

Amount of lease cost recognized by lessee for lease contract.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 4
-URI https://asc.fasb.org/extlink&oid=128292326&loc=SL77918686-209980

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 55
-Paragraph 53
-URI https://asc.fasb.org/extlink&oid=123414884&loc=SL77918982-209971

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- References

No definition available.

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