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Loans - Risk Category of Loans by Portfolio Segment (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans - Gross $ 598,159 $ 576,343
Agricultural Real Estate [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans - Gross 47,745 44,301
Agricultural Real Estate [Member] | 1-2 [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans - Gross 4,497 3,764
Agricultural Real Estate [Member] | 3 [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans - Gross 15,265 14,588
Agricultural Real Estate [Member] | 4 [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans - Gross 27,648 25,186
Agricultural Real Estate [Member] | 5 [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans - Gross 114 729
Agricultural Real Estate [Member] | 6 [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans - Gross 221 34
Agricultural Real Estate [Member] | 7 [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans - Gross 0 0
Agricultural Real Estate [Member] | 8 [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans - Gross 0 0
Agricultural [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans - Gross 63,393 65,449
Agricultural [Member] | 1-2 [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans - Gross 7,029 9,263
Agricultural [Member] | 3 [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans - Gross 22,954 27,212
Agricultural [Member] | 4 [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans - Gross 33,410 28,974
Agricultural [Member] | 5 [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans - Gross 0 0
Agricultural [Member] | 6 [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans - Gross 0 0
Agricultural [Member] | 7 [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans - Gross 0 0
Agricultural [Member] | 8 [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans - Gross 0 0
Commercial Real Estate [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans - Gross 265,902 248,893
Commercial Real Estate [Member] | 1-2 [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans - Gross 1,295 1,104
Commercial Real Estate [Member] | 3 [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans - Gross 52,072 55,060
Commercial Real Estate [Member] | 4 [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans - Gross 205,801 182,277
Commercial Real Estate [Member] | 5 [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans - Gross 1,871 4,987
Commercial Real Estate [Member] | 6 [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans - Gross 4,863 5,092
Commercial Real Estate [Member] | 7 [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans - Gross 0 373
Commercial Real Estate [Member] | 8 [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans - Gross 0 0
Commercial and Industrial [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans - Gross 98,292 99,498
Commercial and Industrial [Member] | 1-2 [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans - Gross 365 2,525
Commercial and Industrial [Member] | 3 [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans - Gross 24,343 21,610
Commercial and Industrial [Member] | 4 [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans - Gross 70,439 72,059
Commercial and Industrial [Member] | 5 [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans - Gross 2,081 2,119
Commercial and Industrial [Member] | 6 [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans - Gross 673 758
Commercial and Industrial [Member] | 7 [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans - Gross 391 427
Commercial and Industrial [Member] | 8 [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans - Gross 0 0
Industrial Development Bonds [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans - Gross 4,163 4,358
Industrial Development Bonds [Member] | 1-2 [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans - Gross 0 0
Industrial Development Bonds [Member] | 3 [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans - Gross 3,687 3,869
Industrial Development Bonds [Member] | 4 [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans - Gross 476 489
Industrial Development Bonds [Member] | 5 [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans - Gross 0 0
Industrial Development Bonds [Member] | 6 [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans - Gross 0 0
Industrial Development Bonds [Member] | 7 [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans - Gross 0 0
Industrial Development Bonds [Member] | 8 [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans - Gross $ 0 $ 0