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LOANS - Risk Category of Loans by Portfolio Segment (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans - Gross $ 501,232 $ 501,535
Agricultural Real Estate [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans - Gross 35,746 40,143
Agricultural Real Estate [Member] | 1-2 [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans - Gross 3,258 2,719
Agricultural Real Estate [Member] | 3 [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans - Gross 12,953 15,111
Agricultural Real Estate [Member] | 4 [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans - Gross 18,625 21,481
Agricultural Real Estate [Member] | 5 [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans - Gross 786 794
Agricultural Real Estate [Member] | 6 [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans - Gross 36 38
Agricultural Real Estate [Member] | 7 [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans - Gross 88   
Agricultural Real Estate [Member] | 8 [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans - Gross      
Agricultural [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans - Gross 55,331 57,770
Agricultural [Member] | 1-2 [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans - Gross 5,014 5,022
Agricultural [Member] | 3 [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans - Gross 21,695 23,525
Agricultural [Member] | 4 [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans - Gross 28,588 29,188
Agricultural [Member] | 5 [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans - Gross 34 35
Agricultural [Member] | 6 [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans - Gross      
Agricultural [Member] | 7 [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans - Gross      
Agricultural [Member] | 8 [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans - Gross      
Commercial Real Estate [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans - Gross 215,246 199,999
Commercial Real Estate [Member] | 1-2 [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans - Gross 2,573 4,046
Commercial Real Estate [Member] | 3 [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans - Gross 53,936 42,467
Commercial Real Estate [Member] | 4 [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans - Gross 147,286 137,537
Commercial Real Estate [Member] | 5 [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans - Gross 5,283 8,984
Commercial Real Estate [Member] | 6 [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans - Gross 6,168 6,295
Commercial Real Estate [Member] | 7 [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans - Gross    670
Commercial Real Estate [Member] | 8 [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans - Gross      
Commercial and Industrial [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans - Gross 93,978 101,624
Commercial and Industrial [Member] | 1-2 [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans - Gross 605 750
Commercial and Industrial [Member] | 3 [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans - Gross 23,894 21,750
Commercial and Industrial [Member] | 4 [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans - Gross 63,047 71,228
Commercial and Industrial [Member] | 5 [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans - Gross 2,245 3,385
Commercial and Industrial [Member] | 6 [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans - Gross 1,517 2,202
Commercial and Industrial [Member] | 7 [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans - Gross 2,670 2,309
Commercial and Industrial [Member] | 8 [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans - Gross      
Industrial Development Bonds [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans - Gross 3,102 1,299
Industrial Development Bonds [Member] | 1-2 [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans - Gross    97
Industrial Development Bonds [Member] | 3 [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans - Gross 2,758 859
Industrial Development Bonds [Member] | 4 [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans - Gross 344 343
Industrial Development Bonds [Member] | 5 [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans - Gross      
Industrial Development Bonds [Member] | 6 [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans - Gross      
Industrial Development Bonds [Member] | 7 [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans - Gross      
Industrial Development Bonds [Member] | 8 [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans - Gross