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Trust Preferred Capital Notes (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
First National (VA) Statutory Trust II [Member]
    
Trust Preferred Capital Notes (Textual) [Abstract]    
Formation of wholly-owned subsidiary Jun. 08, 2004  
Preferred securities issued through pooled underwriting date Jun. 17, 2004  
Issuance of trust preferred securities $ 5.0  
LIBOR-indexed floating rate of interest 2.91% 3.16%
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  
Preferred securities issued through pooled underwriting date Jul. 31, 2006  
Issuance of trust preferred securities 4.0  
LIBOR-indexed floating rate of interest 1.96% 1.97%
Junior subordinated debt securities $ 4.1  
Securities mandatory redemption date Oct. 01, 2036  
Maximum capital required for capital adequacy 25.00%