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Loans - Summary of Loans (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Jun. 30, 2012
Dec. 31, 2011
Real estate loans:        
Commercial and industrial loans $ 19,701 $ 20,718    
Consumer and other loans 8,045 7,815    
Total loans 377,513 383,594 384,135  
Allowance for loan losses 12,478 13,075 13,999 12,937
Loans, net 365,035 370,519    
Construction and Land Development [Member]
       
Real estate loans:        
Real estate loans 44,305 43,524    
Total loans 44,305 43,524    
Secured by 1-4 Family Residential [Member]
       
Real estate loans:        
Real estate loans 145,628 134,964    
Total loans 145,628 134,964    
Other Real Estate Loans [Member]
       
Real estate loans:        
Real estate loans 159,834 176,573    
Total loans $ 159,834 $ 176,573