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Loans - Contractual Aging of Recorded Investment in Past Due Loans by Portfolio Classification of Loans (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due $ 1,114 $ 1,744  
Current 821,910 756,350  
Loans after net deferred loan fees and costs 823,024 758,094  
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 63,943 62,192  
Loans after net deferred loan fees and costs 64,044 62,336  
Recorded Investment > 90 Days and Accruing 0 0  
Agricultural [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due   101  
Current 95,238 84,591  
Loans after net deferred loan fees and costs 95,238 84,692  
Recorded Investment > 90 Days and Accruing 0 0  
Commercial And Industrial and Industrial Development Bonds [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 42    
Current 132,745 115,093  
Loans after net deferred loan fees and costs 132,787 115,093  
Recorded Investment > 90 Days and Accruing 0 0  
Consumer Real Estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 890 1,404  
Current 82,310 84,469  
Loans after net deferred loan fees and costs 83,200 85,873  
Recorded Investment > 90 Days and Accruing 0 0  
Commercial Real Estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 38 60  
Current 409,915 376,827  
Loans after net deferred loan fees and costs 409,953 376,887  
Recorded Investment > 90 Days and Accruing 0 0  
Consumer [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 43 35  
Current 37,759 33,178  
Loans after net deferred loan fees and costs 37,802 33,213  
Recorded Investment > 90 Days and Accruing 0 0  
30 to 59 Days Past Due [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 599 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 565 882  
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 34 29  
60 to 89 Days Past Due [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 256 21  
60 to 89 Days Past Due [Member] | Commercial And Industrial and Industrial Development Bonds [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 42    
60 to 89 Days Past Due [Member] | Consumer Real Estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 212 15  
60 to 89 Days Past Due [Member] | Consumer [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 2 6  
Greater Than 90 Days [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 259 639  
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 113 $ 507  
Greater Than 90 Days [Member] | Commercial Real Estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 38    
Greater Than 90 Days [Member] | Consumer [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due $ 7