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Composition of Net Loans (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Real estate loans $ 295,469 $ 312,766
Business loans 52,317 38,160
Consumer loans 30,656 38,540
Total Gross Loans 378,442 389,466
Unearned income (242) (204)
Allowance for loan losses (7,449) (6,681)
Loans, net 370,751 382,581
Land Development and Construction
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Real estate loans 11,280 13,480
Farmland
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Real estate loans 32,986 35,912
1-4 Family Mortgages
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Real estate loans 119,297 133,987
Commercial Real Estate
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Real estate loans 131,906 129,387
Commercial and Industrial Loans
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Business loans 50,802 36,581
Farm Production and Other Farm Loans
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Business loans 1,515 1,579
Credit Cards
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Consumer loans 976 995
Other Consumer Loans
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Consumer loans $ 29,680 $ 37,545