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Loans - Risk Category of Loans by Portfolio Class (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans after net deferred loan fees and costs $ 823,024 $ 758,094
Commercial and Industrial [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans after net deferred loan fees and costs 126,372 109,361
Commercial Real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans after net deferred loan fees and costs 409,953 376,887
1-2 [Member] | Commercial and Industrial [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans after net deferred loan fees and costs 9,205 10,060
1-2 [Member] | Commercial Real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans after net deferred loan fees and costs 1,244 677
3 [Member] | Commercial and Industrial [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans after net deferred loan fees and costs 15,277 14,064
3 [Member] | Commercial Real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans after net deferred loan fees and costs 32,498 27,858
4 [Member] | Commercial and Industrial [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans after net deferred loan fees and costs 99,581 83,100
4 [Member] | Commercial Real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans after net deferred loan fees and costs 359,600 333,523
5 [Member] | Commercial and Industrial [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans after net deferred loan fees and costs 1,381 1,379
5 [Member] | Commercial Real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans after net deferred loan fees and costs 7,758 8,321
6 [Member] | Commercial and Industrial [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans after net deferred loan fees and costs 817 641
6 [Member] | Commercial Real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans after net deferred loan fees and costs 8,853 6,508
7 [Member] | Commercial and Industrial [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans after net deferred loan fees and costs 111 117
Agricultural Real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans after net deferred loan fees and costs 64,044 62,336
Agricultural Real Estate [Member] | 1-2 [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans after net deferred loan fees and costs 4,143 4,399
Agricultural Real Estate [Member] | 3 [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans after net deferred loan fees and costs 15,244 16,660
Agricultural Real Estate [Member] | 4 [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans after net deferred loan fees and costs 43,416 39,808
Agricultural Real Estate [Member] | 5 [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans after net deferred loan fees and costs 1,125 1,209
Agricultural Real Estate [Member] | 6 [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans after net deferred loan fees and costs 116 260
Agricultural [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans after net deferred loan fees and costs 95,238 84,692
Agricultural [Member] | 1-2 [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans after net deferred loan fees and costs 6,558 7,334
Agricultural [Member] | 3 [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans after net deferred loan fees and costs 37,267 31,397
Agricultural [Member] | 4 [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans after net deferred loan fees and costs 51,312 44,560
Agricultural [Member] | 5 [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans after net deferred loan fees and costs 101 1,234
Agricultural [Member] | 6 [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans after net deferred loan fees and costs   167
Industrial Development Bonds [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans after net deferred loan fees and costs 6,415 5,732
Industrial Development Bonds [Member] | 3 [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans after net deferred loan fees and costs 3,489 2,640
Industrial Development Bonds [Member] | 4 [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans after net deferred loan fees and costs $ 2,926 $ 3,092