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LOANS - Contractual Aging of Recorded Investment in Past Due Loans by Portfolio Segment of Loans (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Jun. 30, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]      
30-59 Days Past Due $ 1,136 $ 729  
60-89 Days Past Due 256 7  
Greater Than 90 Days 3,994 4,092  
Total Past Due 5,386 4,828  
Current 495,688 496,574  
Total Financing Receivables 501,074 501,402  
Recorded Investment > 90 Days and Accruing    1   
Other real estate owned residential mortgages [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
30-59 Days Past Due 453 575  
60-89 Days Past Due 249     
Greater Than 90 Days 319 648  
Total Past Due 1,021 1,223  
Current 76,927 79,064  
Total Financing Receivables 77,948 80,287  
Recorded Investment > 90 Days and Accruing        
Agricultural Real Estate [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
30-59 Days Past Due 104     
60-89 Days Past Due        
Greater Than 90 Days 88     
Total Past Due 192     
Current 35,554 40,143  
Total Financing Receivables 35,746 40,143  
Recorded Investment > 90 Days and Accruing        
Agricultural [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
30-59 Days Past Due    11  
60-89 Days Past Due        
Greater Than 90 Days        
Total Past Due    11  
Current 55,331 57,759  
Total Financing Receivables 55,331 57,770  
Recorded Investment > 90 Days and Accruing        
Commercial Real Estate [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
30-59 Days Past Due 501     
60-89 Days Past Due        
Greater Than 90 Days 1,035 877  
Total Past Due 1,536 877  
Current 213,710 199,122  
Total Financing Receivables 215,246 199,999  
Recorded Investment > 90 Days and Accruing        
Commercial and Industrial [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
30-59 Days Past Due 65 78  
60-89 Days Past Due        
Greater Than 90 Days 2,552 2,567  
Total Past Due 2,617 2,645  
Current 94,463 100,278  
Total Financing Receivables 97,080 102,923  
Recorded Investment > 90 Days and Accruing        
Consumer [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
30-59 Days Past Due 13 65  
60-89 Days Past Due 7 7  
Greater Than 90 Days        
Total Past Due 20 72  
Current 19,703 20,208  
Total Financing Receivables 19,723 20,280  
Recorded Investment > 90 Days and Accruing    $ 1