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Loans - Risk Category of Loans by Portfolio Class (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans after net deferred loan fees and costs $ 685,878 $ 621,926
Commercial and Industrial [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans after net deferred loan fees and costs 100,198 100,126
Commercial Real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans after net deferred loan fees and costs 322,230 270,188
1-2 [Member] | Commercial and Industrial [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans after net deferred loan fees and costs 261 1,771
1-2 [Member] | Commercial Real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans after net deferred loan fees and costs 597 1,072
3 [Member] | Commercial and Industrial [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans after net deferred loan fees and costs 22,300 15,582
3 [Member] | Commercial Real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans after net deferred loan fees and costs 24,264 34,229
4 [Member] | Commercial and Industrial [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans after net deferred loan fees and costs 76,855 80,079
4 [Member] | Commercial Real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans after net deferred loan fees and costs 293,381 225,015
5 [Member] | Commercial and Industrial [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans after net deferred loan fees and costs 57 2,299
5 [Member] | Commercial Real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans after net deferred loan fees and costs 1,738 7,083
6 [Member] | Commercial and Industrial [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans after net deferred loan fees and costs 543 165
6 [Member] | Commercial Real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans after net deferred loan fees and costs 1,828 2,080
7 [Member] | Commercial and Industrial [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans after net deferred loan fees and costs 182 230
7 [Member] | Commercial Real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans after net deferred loan fees and costs 422 709
Agricultural Real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans after net deferred loan fees and costs 58,463 50,895
Agricultural Real Estate [Member] | 1-2 [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans after net deferred loan fees and costs 5,841 4,319
Agricultural Real Estate [Member] | 3 [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans after net deferred loan fees and costs 16,593 15,780
Agricultural Real Estate [Member] | 4 [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans after net deferred loan fees and costs 35,475 30,472
Agricultural Real Estate [Member] | 5 [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans after net deferred loan fees and costs 192 111
Agricultural Real Estate [Member] | 6 [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans after net deferred loan fees and costs 362 213
Agricultural [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans after net deferred loan fees and costs 82,762 74,611
Agricultural [Member] | 1-2 [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans after net deferred loan fees and costs 12,025 11,490
Agricultural [Member] | 3 [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans after net deferred loan fees and costs 21,247 26,871
Agricultural [Member] | 4 [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans after net deferred loan fees and costs 49,220 36,225
Agricultural [Member] | 5 [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans after net deferred loan fees and costs 250  
Agricultural [Member] | 7 [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans after net deferred loan fees and costs 20 25
Industrial Development Bonds [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans after net deferred loan fees and costs 6,491 4,698
Industrial Development Bonds [Member] | 3 [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans after net deferred loan fees and costs 3,100 4,289
Industrial Development Bonds [Member] | 4 [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans after net deferred loan fees and costs $ 3,391 $ 409