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Loans - Contractual Aging of Recorded Investment in Past Due Loans by Portfolio Classification of Loans (Detail) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Jun. 30, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due $ 1,057 $ 1,744  
Current 789,781 756,350  
Loans after net deferred loan fees and costs 790,838 758,094 $ 729,915
Recorded Investment > 90 Days and Accruing 0 0 0
Agricultural Real Estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 101 144  
Current 63,902 62,192  
Loans after net deferred loan fees and costs 64,003 62,336 60,203
Agricultural [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due   101  
Current 83,771 84,591  
Loans after net deferred loan fees and costs 83,771 84,692 83,433
Commercial And Industrial and Industrial Development Bonds [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 129,675 115,093  
Loans after net deferred loan fees and costs 129,675 115,093 110,386
Consumer Real Estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 843 1,404  
Current 83,060 84,469  
Loans after net deferred loan fees and costs 83,903 85,873 88,165
Commercial Real Estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 60 60  
Current 393,991 376,827  
Loans after net deferred loan fees and costs 394,051 376,887 357,243
Consumer [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 53 35  
Current 35,382 33,178  
Loans after net deferred loan fees and costs 35,435 33,213 $ 30,485
30 to 59 Days Past Due [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 510 1,084  
30 to 59 Days Past Due [Member] | Agricultural Real Estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due   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 424 882  
30 to 59 Days Past Due [Member] | Commercial Real Estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 60 60  
30 to 59 Days Past Due [Member] | Consumer [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 26 29  
60 to 89 Days Past Due [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 0 21  
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   6  
Greater Than 90 Days [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 547 639  
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] | Consumer Real Estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 419 $ 507  
Greater Than 90 Days [Member] | Consumer [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due $ 27