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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, 2014
Dec. 31, 2013
Sep. 30, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]      
30-59 Days Past Due $ 717 $ 806  
60-89 Days Past Due 877 2  
Greater Than 90 Days 494 633  
Total Past Due 2,088 1,441  
Current 606,516 574,672  
Total Financing Receivables 608,604 576,113 523,326
Recorded Investment > 90 Days and Accruing 0 0 0
Consumer Real Estate [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
30-59 Days Past Due 576 778  
60-89 Days Past Due 150 0  
Greater Than 90 Days 489 234  
Total Past Due 1,215 1,012  
Current 96,436 91,426  
Total Financing Receivables 97,651 92,438 79,268
Recorded Investment > 90 Days and Accruing 0 0  
Agricultural Real Estate [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
30-59 Days Past Due 25 0  
60-89 Days Past Due 0 0  
Greater Than 90 Days 0 0  
Total Past Due 25 0  
Current 48,787 44,301  
Total Financing Receivables 48,812 44,301 37,758
Recorded Investment > 90 Days and Accruing 0 0  
Agricultural [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
30-59 Days Past Due 0 0  
60-89 Days Past Due 0 0  
Greater Than 90 Days 0 0  
Total Past Due 0 0  
Current 67,221 65,449  
Total Financing Receivables 67,221 65,449 56,752
Recorded Investment > 90 Days and Accruing 0 0  
Commercial Real Estate [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
30-59 Days Past Due 56 0  
60-89 Days Past Due 709 0  
Greater Than 90 Days 0 373  
Total Past Due 765 373  
Current 273,309 248,520  
Total Financing Receivables 274,074 248,893 232,104
Recorded Investment > 90 Days and Accruing 0 0  
Commercial and Industrial [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
30-59 Days Past Due 0 0  
60-89 Days Past Due 0 0  
Greater Than 90 Days 0 26  
Total Past Due 0 26  
Current 97,780 103,830  
Total Financing Receivables 97,780 103,856 96,643
Recorded Investment > 90 Days and Accruing 0 0  
Consumer [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
30-59 Days Past Due 60 28  
60-89 Days Past Due 18 2  
Greater Than 90 Days 5 0  
Total Past Due 83 30  
Current 22,983 21,146  
Total Financing Receivables 23,066 21,176 20,801
Recorded Investment > 90 Days and Accruing $ 0 $ 0