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Loans - Contractual Aging of Recorded Investment in Past Due Loans by Portfolio Classification of Loans (Detail) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due $ 733 $ 1,114  
Current 834,004 821,910  
Loans after net deferred loan fees and costs 834,737 823,024 $ 771,206
Recorded Investment > 90 Days and Accruing 0 0 0
Agricultural Real Estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 18 101  
Current 67,551 63,943  
Loans after net deferred loan fees and costs 67,569 64,044 62,803
Agricultural [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 99,954 95,238  
Loans after net deferred loan fees and costs 99,954 95,238 87,078
Commercial And Industrial and Industrial Development Bonds [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 115 42  
Current 129,750 132,745  
Loans after net deferred loan fees and costs 129,865 132,787 121,183
Consumer Real Estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 556 890  
Current 83,496 82,310  
Loans after net deferred loan fees and costs 84,052 83,200 84,081
Commercial Real Estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 1 38  
Current 414,665 409,915  
Loans after net deferred loan fees and costs 414,666 409,953 382,183
Consumer [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 43 43  
Current 38,588 37,759  
Loans after net deferred loan fees and costs 38,631 37,802 $ 33,878
30 to 59 Days Past Due [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 632 599  
30 to 59 Days Past Due [Member] | Agricultural Real Estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 18    
30 to 59 Days Past Due [Member] | Commercial And Industrial and Industrial Development Bonds [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 115    
30 to 59 Days Past Due [Member] | Consumer Real Estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 461 565  
30 to 59 Days Past Due [Member] | Consumer [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 38 34  
60 to 89 Days Past Due [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 5 256  
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 0 212  
60 to 89 Days Past Due [Member] | Consumer [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 5 2  
Greater Than 90 Days [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 96 259  
Greater Than 90 Days [Member] | Agricultural Real Estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due   101  
Greater Than 90 Days [Member] | Consumer Real Estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 95 113  
Greater Than 90 Days [Member] | Commercial Real Estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due $ 1 38  
Greater Than 90 Days [Member] | Consumer [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due   $ 7