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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
Sep. 30, 2013
Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]    
30-59 Days Past Due $ 1,089 $ 729
60-89 Days Past Due 1,187 7
Greater Than 90 Days 960 4,092
Total Past Due 3,236 4,828
Current 520,090 496,574
Total Financing Receivables 523,326 501,402
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 847 575
60-89 Days Past Due 106   
Greater Than 90 Days 339 648
Total Past Due 1,292 1,223
Current 77,976 79,064
Total Financing Receivables 79,268 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     
60-89 Days Past Due 88   
Greater Than 90 Days     
Total Past Due 88   
Current 37,670 40,143
Total Financing Receivables 37,758 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 56,752 57,759
Total Financing Receivables 56,752 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      
60-89 Days Past Due 975   
Greater Than 90 Days 571 877
Total Past Due 1,546 877
Current 230,558 199,122
Total Financing Receivables 232,104 199,999
Recorded Investment > 90 Days and Accruing      
Commercial and Industrial [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
30-59 Days Past Due 228 78
60-89 Days Past Due      
Greater Than 90 Days 50 2,567
Total Past Due 278 2,645
Current 96,365 100,278
Total Financing Receivables 96,643 102,923
Recorded Investment > 90 Days and Accruing      
Consumer [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
30-59 Days Past Due 14 65
60-89 Days Past Due 18 7
Greater Than 90 Days      
Total Past Due 32 72
Current 20,769 20,208
Total Financing Receivables 20,801 20,280
Recorded Investment > 90 Days and Accruing    $ 1