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Allowance for Loan Losses (Details 2) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011
Impaired loans and the related allowance
Unpaid Principal Balance	$ 27,748		$ 32,317
Recorded Investment with No Allowance	9,338		15,161
Recorded Investment with Allowance	12,593		10,758
Total Recorded Investment	21,931		25,920
Related Allowance	3,205		2,438
Average Recorded Investment	22,103		38,174
Interest Income Recognized	367		1,091
Commercial and industrial [Member]
Impaired loans and the related allowance
Unpaid Principal Balance	402		480
Recorded Investment with Allowance	402		480
Total Recorded Investment	402		480
Related Allowance	55		309
Average Recorded Investment	468		660
Interest Income Recognized	10		27
Consumer and other loans [Member]
Impaired loans and the related allowance
Unpaid Principal Balance
Recorded Investment with No Allowance
Recorded Investment with Allowance
Total Recorded Investment
Related Allowance
Average Recorded Investment
Interest Income Recognized
Other real estate loans [Member]
Impaired loans and the related allowance
Unpaid Principal Balance	15,435		15,165
Recorded Investment with No Allowance	7,447		8,135
Recorded Investment with Allowance	3,366		2,805
Total Recorded Investment	10,813		10,940
Related Allowance	1,033		351
Average Recorded Investment	10,618		23,918
Interest Income Recognized	108		396
Construction and Land Development [Member] | Real estate loans [Member]
Impaired loans and the related allowance
Unpaid Principal Balance	5,586		8,106
Recorded Investment with No Allowance	595		3,531
Recorded Investment with Allowance	4,661		4,109
Total Recorded Investment	5,256		7,640
Related Allowance	1,145		930
Average Recorded Investment	5,730		7,077
Interest Income Recognized	137		367
Secured by 1-4 Family Residential [Member] | Real estate loans [Member]
Impaired loans and the related allowance
Unpaid Principal Balance	6,325		8,566
Recorded Investment with No Allowance	1,296		3,495
Recorded Investment with Allowance	4,164		3,365
Total Recorded Investment	5,460		6,860
Related Allowance	972		848
Average Recorded Investment	5,287		6,519
Interest Income Recognized	$ 112		$ 301

X

- Definition

Impaired financing receivable interest income recognized.

+ References

No definition available.

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X

- Definition

Impaired financing receivables average recorded investment.

+ References

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Namespace Prefix:	fxnc_
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X

- Definition

Amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 14A

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953550-111524

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- Definition

Amount of allowance for credit losses related to recorded investment.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 15

-Subparagraph (a)(3)

-URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5212-111524

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- Definition

Amount of unpaid principal balance of impaired financing receivables with related allowance for credit losses and without related allowance for credit losses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 15

-Subparagraph (a)(4)

-URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5212-111524

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- Definition

Amount of investment in impaired financing receivables for which there is no related allowance for credit losses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 14A

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953550-111524

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- Definition

Amount of investment in impaired financing receivables for which there is a related allowance for credit losses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 14A

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953550-111524

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