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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, 2018
Dec. 31, 2017
Jun. 30, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due $ 831 $ 1,114  
Current 830,184 821,910  
Loans after net deferred loan fees and costs 831,015 823,024 $ 790,838
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 410 599  
60 to 89 Days Past Due [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 171 256  
Greater Than 90 Days [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 250 259  
Agricultural Real Estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 16 101  
Current 69,660 63,943  
Loans after net deferred loan fees and costs 69,676 64,044 64,003
Agricultural Real Estate [Member] | 30 to 59 Days Past Due [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 16    
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 104,980 95,238  
Loans after net deferred loan fees and costs 104,980 95,238 83,771
Commercial And Industrial and Industrial Development Bonds [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 44 42  
Current 122,466 132,745  
Loans after net deferred loan fees and costs 122,510 132,787 129,675
Commercial And Industrial and Industrial Development Bonds [Member] | 30 to 59 Days Past Due [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 44    
Commercial And Industrial and Industrial Development Bonds [Member] | 60 to 89 Days Past Due [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due   42  
Consumer Real Estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 718 890  
Current 81,650 82,310  
Loans after net deferred loan fees and costs 82,368 83,200 83,903
Consumer Real Estate [Member] | 30 to 59 Days Past Due [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 325 565  
Consumer Real Estate [Member] | 60 to 89 Days Past Due [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 143 212  
Consumer Real Estate [Member] | Greater Than 90 Days [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 250 113  
Commercial Real Estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due   38  
Current 410,886 409,915  
Loans after net deferred loan fees and costs 410,886 409,953 394,051
Commercial Real Estate [Member] | Greater Than 90 Days [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due   38  
Consumer [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 53 43  
Current 40,542 37,759  
Loans after net deferred loan fees and costs 40,595 37,802 $ 35,435
Consumer [Member] | 30 to 59 Days Past Due [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 25 34  
Consumer [Member] | 60 to 89 Days Past Due [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due $ 28 2  
Consumer [Member] | Greater Than 90 Days [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due   $ 7