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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, 2016
Dec. 31, 2015
Mar. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due $ 2,082 $ 2,190  
Current 705,578 683,688  
Loans after net deferred loan fees and costs 707,660 685,878 $ 614,709
Recorded Investment > 90 Days and Accruing 0 0 0
Agricultural Real Estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 219 162  
Current 59,260 58,301  
Loans after net deferred loan fees and costs 59,479 58,463 51,396
Agricultural [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 3 145  
Current 78,018 82,617  
Loans after net deferred loan fees and costs 78,021 82,762 71,571
Commercial And Industrial and Industrial Development Bonds [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 19 71  
Current 109,367 106,618  
Loans after net deferred loan fees and costs 109,386 106,689 99,895
Consumer Real Estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 1,220 707  
Current 86,877 87,240  
Loans after net deferred loan fees and costs 88,097 87,947 97,019
Recorded Investment > 90 Days and Accruing 0 0  
Commercial Real Estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 570 1,077  
Current 344,091 321,153  
Loans after net deferred loan fees and costs 344,661 322,230 271,201
Consumer [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 51 28  
Current 27,965 27,759  
Loans after net deferred loan fees and costs 28,016 27,787 $ 23,627
30 to 59 Days Past Due [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 806 609  
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   51  
30 to 59 Days Past Due [Member] | Consumer Real Estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 621 303  
30 to 59 Days Past Due [Member] | Commercial Real Estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 148 236  
30 to 59 Days Past Due [Member] | Consumer [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 37 19  
60 to 89 Days Past Due [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 226 201  
60 to 89 Days Past Due [Member] | Agricultural Real Estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 57    
60 to 89 Days Past Due [Member] | Agricultural [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 3 145  
60 to 89 Days Past Due [Member] | Consumer Real Estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 156 47  
60 to 89 Days Past Due [Member] | Consumer [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 10 9  
Greater Than 90 Days [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 1,050 1,380  
Greater Than 90 Days [Member] | Agricultural Real Estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 162 162  
Greater Than 90 Days [Member] | Commercial And Industrial and Industrial Development Bonds [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 19 20  
Greater Than 90 Days [Member] | Consumer Real Estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 443 357  
Greater Than 90 Days [Member] | Commercial Real Estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 422 $ 841  
Greater Than 90 Days [Member] | Consumer [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due $ 4