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Note 16 - Derivative Financial Instruments - Derivative Instruments Components (Details) - Interest Rate Swap [Member] - Designated as Hedging Instrument [Member] $ in Thousands	Sep. 30, 2021 USD ($)
Notional amount	$ 9,000
Derivative Assets	990
Derivative liabilities	0
Interest rate swap contracts	$ 0	[1]
[1] Collateral pledged may be comprised of cash or securities.

X

- Definition

Amount of obligation to return cash or securities collateral under master netting arrangements that have not been offset against derivative assets.

+ References

No definition available.

+ Details

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Namespace Prefix:	fxnc_
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Balance Type:	credit
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X

- Definition

Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313

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-Publisher FASB
-Name Accounting Standards Codification
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Period Type:	instant

X

- Definition

Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312

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-Publisher FASB
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-URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313

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Period Type:	instant

X

- Definition

Nominal or face amount used to calculate payment on derivative.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
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X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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