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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, 2018
Dec. 31, 2017
Sep. 30, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due $ 777 $ 1,114  
Current 837,921 821,910  
Loans after net deferred loan fees and costs 838,698 823,024 $ 795,205
Recorded Investment > 90 Days and Accruing 0 0 0
30 to 59 Days Past Due [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 590 599  
60 to 89 Days Past Due [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 9 256  
Greater Than 90 Days [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 178 259  
Consumer Real Estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 742 890  
Current 81,887 82,310  
Loans after net deferred loan fees and costs 82,629 83,200 83,875
Consumer Real Estate [Member] | 30 to 59 Days Past Due [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 555 565  
Consumer Real Estate [Member] | 60 to 89 Days Past Due [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 9 212  
Consumer Real Estate [Member] | Greater Than 90 Days [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 178 113  
Agricultural Real Estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due   101  
Current 68,524 63,943  
Loans after net deferred loan fees and costs 68,524 64,044 63,571
Agricultural Real Estate [Member] | Greater Than 90 Days [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due   101  
Agricultural [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 103,760 95,238  
Loans after net deferred loan fees and costs 103,760 95,238 87,239
Commercial Real Estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due   38  
Current 416,632 409,915  
Loans after net deferred loan fees and costs 416,632 409,953 393,913
Commercial Real Estate [Member] | Greater Than 90 Days [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due   38  
Commercial and Industrial [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due   42  
Current 125,612 132,745  
Loans after net deferred loan fees and costs 125,612 132,787 130,720
Commercial and Industrial [Member] | 60 to 89 Days Past Due [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due   42  
Consumer [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 35 43  
Current 41,506 37,759  
Loans after net deferred loan fees and costs 41,541 37,802 $ 35,887
Consumer [Member] | 30 to 59 Days Past Due [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due $ 35 34  
Consumer [Member] | 60 to 89 Days Past Due [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due   2  
Consumer [Member] | Greater Than 90 Days [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due   $ 7