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Loans - Contractual Aging of Recorded Investment in Past Due Loans by Portfolio Classification of Loans (Detail) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due $ 1,511 $ 1,744  
Current 793,694 756,350  
Loans after net deferred loan fees and costs 795,205 758,094 $ 737,057
Recorded Investment > 90 Days and Accruing 0 0 0
Agricultural Real Estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 205 144  
Current 63,366 62,192  
Loans after net deferred loan fees and costs 63,571 62,336 59,458
Agricultural [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 126 101  
Current 87,113 84,591  
Loans after net deferred loan fees and costs 87,239 84,692 79,332
Commercial And Industrial and Industrial Development Bonds [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 130,720 115,093  
Loans after net deferred loan fees and costs 130,720 115,093 111,953
Consumer Real Estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 1,037 1,404  
Current 82,838 84,469  
Loans after net deferred loan fees and costs 83,875 85,873 85,977
Commercial Real Estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 98 60  
Current 393,815 376,827  
Loans after net deferred loan fees and costs 393,913 376,887 369,721
Consumer [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 45 35  
Current 35,842 33,178  
Loans after net deferred loan fees and costs 35,887 33,213 $ 30,616
30 to 59 Days Past Due [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 673 1,084  
30 to 59 Days Past Due [Member] | Agricultural Real Estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 104 12  
30 to 59 Days Past Due [Member] | Agricultural [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due   101  
30 to 59 Days Past Due [Member] | Consumer Real Estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 532 882  
30 to 59 Days Past Due [Member] | Commercial Real Estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due   60  
30 to 59 Days Past Due [Member] | Consumer [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 37 29  
60 to 89 Days Past Due [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 10 21  
60 to 89 Days Past Due [Member] | Agricultural [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 2    
60 to 89 Days Past Due [Member] | Consumer Real Estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 0 15  
60 to 89 Days Past Due [Member] | Consumer [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 8 6  
Greater Than 90 Days [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 828 639  
Greater Than 90 Days [Member] | Agricultural Real Estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 101 132  
Greater Than 90 Days [Member] | Agricultural [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 124    
Greater Than 90 Days [Member] | Consumer Real Estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 505 $ 507  
Greater Than 90 Days [Member] | Commercial Real Estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due $ 98