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Loans (Details) (USD $)
3 Months Ended
Mar. 31, 2013
item
Dec. 31, 2012
Mar. 31, 2012
Dec. 31, 2011
Outstanding loan balances        
Total gross loans $ 704,880,000 $ 689,608,000    
Net deferred loan fees (1,035,000) (937,000)    
Allowance for loan losses 17,743,000 18,118,000 19,801,000 19,314,000
Net loans held for investment 686,102,000 670,553,000    
Loans held for sale 9,138,000 22,549,000    
Number of related loans for which the purchaser is seeking reimbursement 5      
Reserve maintained for the exercise of repurchase option by buyer 1,100,000      
Losses incurred on settlement 800,000      
Number of loans settled 6      
Concentration of Credit Risk        
Loan portfolio collateralized by various forms of real estate 551,300,000 537,400,000    
Unpaid principal balance of loans serviced for others, exclusive of SBA loans 6,900,000 7,100,000    
Unpaid principal balance of SBA loans serviced for others 3,100,000 3,100,000    
Real Estate Secured
       
Outstanding loan balances        
Total gross loans 516,588,000 493,008,000    
Allowance for loan losses 6,140,000 6,879,000 7,444,000 9,645,000
Real Estate Secured | Multi-family residential
       
Outstanding loan balances        
Total gross loans 19,747,000 21,467,000    
Real Estate Secured | Residential 1 to 4 family
       
Outstanding loan balances        
Total gross loans 46,894,000 41,444,000    
Real Estate Secured | Home equity lines of credit
       
Outstanding loan balances        
Total gross loans 32,852,000 31,863,000    
Real Estate Secured | Commercial
       
Outstanding loan balances        
Total gross loans 391,159,000 372,592,000    
Real Estate Secured | Farmland
       
Outstanding loan balances        
Total gross loans 25,936,000 25,642,000    
Commercial
       
Outstanding loan balances        
Total gross loans 148,863,000 147,064,000    
Allowance for loan losses 6,742,000 6,154,000 10,019,000 6,549,000
Commercial | Commercial and industrial
       
Outstanding loan balances        
Total gross loans 120,988,000 125,340,000    
Commercial | Agriculture
       
Outstanding loan balances        
Total gross loans 27,820,000 21,663,000    
Commercial | Other
       
Outstanding loan balances        
Total gross loans 55,000 61,000    
Construction
       
Outstanding loan balances        
Total gross loans 10,894,000 19,716,000    
Allowance for loan losses 142,000 313,000 555,000 488,000
Construction | Single family residential
       
Outstanding loan balances        
Total gross loans 8,803,000 8,074,000    
Construction | Single family residential - Spec.
       
Outstanding loan balances        
Total gross loans 847,000 535,000    
Construction | Multi-family
       
Outstanding loan balances        
Total gross loans 767,000 778,000    
Construction | Commercial
       
Outstanding loan balances        
Total gross loans 477,000 10,329,000    
Land
       
Outstanding loan balances        
Total gross loans 23,816,000 24,664,000    
Allowance for loan losses 4,578,000 4,670,000 1,604,000 2,416,000
Installment loans to individuals
       
Outstanding loan balances        
Total gross loans 4,527,000 4,895,000    
Allowance for loan losses 106,000 64,000 139,000 175,000
All other loans (including overdrafts)
       
Outstanding loan balances        
Total gross loans 192,000 261,000    
Allowance for loan losses $ 35,000 $ 38,000 $ 40,000 $ 41,000