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Securities (Details Textual) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2012 Contract
Securities (Textual) [Abstract]
Number of U.S. agency and mortgage-backed securities	2
Number of obligation of state and political subdivisions in an unrealized loss position	10
Percentage of investment portfolio	100.00%
Weighted-average period of re-pricing of portfolio	4 years
Investment in Federal Home Loan Bank stock	$ 1.5

X

- Definition

Investment in federal home loan bank stock.

+ References

No definition available.

+ Details

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Namespace Prefix:	fxnc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Number obligation of state and political subdivisions in an unrealized loss position.

+ References

No definition available.

+ Details

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

X

- Definition

Number of securities in unrealized loss position.

+ References

No definition available.

+ Details

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

X

- Definition

Percentage of investment portfolio.

+ References

No definition available.

+ Details

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Namespace Prefix:	fxnc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Details

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Namespace Prefix:	fxnc_
Data Type:	xbrli:stringItemType
Balance Type:	na
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X

- Definition

Weighted average period of pricing of portfolio.

+ References

No definition available.

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