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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

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