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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
Dec. 31, 2013
Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]    
30-59 Days Past Due $ 806 $ 715
60-89 Days Past Due 2 1
Greater Than 90 Days 633 4,092
Total Past Due 1,441 4,808
Current 574,672 496,594
Total Financing Receivables 576,113 501,402
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 778 575
60-89 Days Past Due      
Greater Than 90 Days 234 648
Total Past Due 1,012 1,223
Current 91,426 79,064
Total Financing Receivables 92,438 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      
Greater Than 90 Days      
Total Past Due      
Current 44,301 40,143
Total Financing Receivables 44,301 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 65,449 57,759
Total Financing Receivables 65,449 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      
Greater Than 90 Days 373 877
Total Past Due 373 877
Current 248,520 199,122
Total Financing Receivables 248,893 199,999
Recorded Investment > 90 Days and Accruing      
Commercial and Industrial [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
30-59 Days Past Due    78
60-89 Days Past Due      
Greater Than 90 Days 26 2,567
Total Past Due 26 2,645
Current 103,830 100,278
Total Financing Receivables 103,856 102,923
Recorded Investment > 90 Days and Accruing      
Consumer [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
30-59 Days Past Due 28 51
60-89 Days Past Due 2 1
Greater Than 90 Days      
Total Past Due 30 52
Current 21,146 20,228
Total Financing Receivables 21,176 20,280
Recorded Investment > 90 Days and Accruing    $ 1