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Loans (Details 2) (USD $)
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Investment in impaired loans      
Recorded Investment $ 13,473,000   $ 17,312,000
Unpaid Principal Balance 18,924,000   24,271,000
Impaired Loans With Specific Allowance 10,567,000   10,177,000
Impaired Loans Without Specific Allowance 2,906,000   7,135,000
Specific Allowance for Impaired Loans 6,261,000   6,061,000
Average Recorded Investment 15,437,000 15,116,000  
Interest Income Recognized   2,000  
Increase in interest income if interest on non-accruing loans had been recognized at original interest rates stipulated in the respective loan agreements 200,000 300,000  
Real Estate Secured | Residential 1 to 4 family
      
Investment in impaired loans      
Recorded Investment 603,000   831,000
Unpaid Principal Balance 751,000   1,035,000
Impaired Loans With Specific Allowance 603,000   246,000
Impaired Loans Without Specific Allowance     585,000
Specific Allowance for Impaired Loans 91,000   18,000
Average Recorded Investment 718,000 616,000  
Real Estate Secured | Home equity lines of credit
      
Investment in impaired loans      
Recorded Investment 57,000   58,000
Unpaid Principal Balance 64,000   152,000
Impaired Loans With Specific Allowance 57,000   58,000
Specific Allowance for Impaired Loans 7,000   7,000
Average Recorded Investment 58,000 373,000  
Real Estate Secured | Commercial
      
Investment in impaired loans      
Recorded Investment 707,000   933,000
Unpaid Principal Balance 1,413,000   1,799,000
Impaired Loans With Specific Allowance 39,000   42,000
Impaired Loans Without Specific Allowance 668,000   891,000
Specific Allowance for Impaired Loans 3,000    
Average Recorded Investment 818,000 2,722,000  
Real Estate Secured | Farmland
      
Investment in impaired loans      
Recorded Investment     1,077,000
Unpaid Principal Balance     1,089,000
Impaired Loans Without Specific Allowance     1,077,000
Average Recorded Investment 539,000    
Commercial | Commercial and industrial
      
Investment in impaired loans      
Recorded Investment 3,857,000   4,337,000
Unpaid Principal Balance 4,262,000   4,813,000
Impaired Loans With Specific Allowance 3,039,000   3,410,000
Impaired Loans Without Specific Allowance 818,000   927,000
Specific Allowance for Impaired Loans 2,030,000   2,172,000
Average Recorded Investment 4,103,000 4,429,000  
Interest Income Recognized   2,000  
Commercial | Agriculture
      
Investment in impaired loans      
Recorded Investment 831,000   907,000
Unpaid Principal Balance 1,182,000   1,235,000
Impaired Loans With Specific Allowance 17,000   30,000
Impaired Loans Without Specific Allowance 814,000   877,000
Specific Allowance for Impaired Loans 7,000   13,000
Average Recorded Investment 869,000 2,548,000  
Construction | Commercial
      
Investment in impaired loans      
Recorded Investment     1,380,000
Unpaid Principal Balance     2,508,000
Impaired Loans Without Specific Allowance     1,380,000
Average Recorded Investment 690,000    
Land
      
Investment in impaired loans      
Recorded Investment 7,317,000   7,504,000
Unpaid Principal Balance 11,103,000   11,307,000
Impaired Loans With Specific Allowance 6,711,000   6,106,000
Impaired Loans Without Specific Allowance 606,000   1,398,000
Specific Allowance for Impaired Loans 4,090,000   3,829,000
Average Recorded Investment 7,449,000 3,898,000  
Installment loans to individuals
      
Investment in impaired loans      
Recorded Investment 101,000   285,000
Unpaid Principal Balance 149,000   333,000
Impaired Loans With Specific Allowance 101,000   285,000
Specific Allowance for Impaired Loans 33,000   22,000
Average Recorded Investment $ 193,000 $ 61,000