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Trust Preferred Capital Notes (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2012
First National (VA) Statutory Trust II [Member]
Trust Preferred Capital Notes (Textual) [Abstract]
Formation of wholly-owned subsidiary	Jun. 08, 2004
Issuance of trust preferred securities	$ 5.0
LIBOR-indexed floating rate of interest	2.99%
Junior subordinated debt securities	5.2
Securities mandatory redemption date	Jun. 17, 2034
First National (VA) Statutory Trust III [Member]
Trust Preferred Capital Notes (Textual) [Abstract]
Formation of wholly-owned subsidiary	Jul. 24, 2006
Issuance of trust preferred securities	4.0
LIBOR-indexed floating rate of interest	2.06%
Junior subordinated debt securities	$ 4.1
Securities mandatory redemption date	Oct. 01, 2036
Maximum capital required for capital adequacy	25.00%

X

- Definition

Junior subordinated debenture owed to unconsolidated subsidiary trust issued through pooled underwriting.

+ References

No definition available.

+ Details

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Balance Type:	credit
Period Type:	duration

X

- Definition

Maximum capital required for capital adequacy.

+ References

No definition available.

+ Details

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X

- Definition

Redemption date of securities.

+ References

No definition available.

+ Details

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Namespace Prefix:	fxnc_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

X

- Details

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Namespace Prefix:	fxnc_
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X

- Definition

Interest rate stated in the contractual debt agreement.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(1))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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X

- Definition

Including the current and noncurrent portions, the carrying value of junior subordinated long-term debt owed to unconsolidated subsidiary trusts as of the balance sheet date. Such debt places a lender in a lien position behind debt having a higher priority of repayment in liquidation of the entity's assets and was initially scheduled to be repaid after one year or beyond the normal operating cycle if longer.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.16)

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.16)

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Article 9

+ Details

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Balance Type:	credit
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X

- Definition

Date the subsidiary of the limited liability company (LLC) or limited partnership (LP) was formed, in CCYY-MM-DD format.

+ References

No definition available.

+ Details

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