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Loans - Risk Category of Loans by Portfolio Class (Detail) - USD ($) $ in Thousands | Sep. 30, 2015 | Dec. 31, 2014 | Sep. 30, 2014
--- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans after net deferred loan fees and costs | $ 635,239 | $ 621,926 | $ 608,604
Commercial and Industrial [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans after net deferred loan fees and costs | 84,465 | 100,126 |
Commercial Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans after net deferred loan fees and costs | 301,342 | 270,188 | 274,074
1-2 [Member] | Commercial and Industrial [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans after net deferred loan fees and costs | 294 | 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 | 714 | 1,072 |
3 [Member] | Commercial and Industrial [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans after net deferred loan fees and costs | 14,292 | 15,582 |
3 [Member] | Commercial Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans after net deferred loan fees and costs | 26,839 | 34,229 |
4 [Member] | Commercial and Industrial [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans after net deferred loan fees and costs | 68,560 | 80,079 |
4 [Member] | Commercial Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans after net deferred loan fees and costs | 269,865 | 225,015 |
5 [Member] | Commercial and Industrial [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans after net deferred loan fees and costs | 958 | 2,299 |
5 [Member] | Commercial Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans after net deferred loan fees and costs | 1,689 | 7,083 |
6 [Member] | Commercial and Industrial [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans after net deferred loan fees and costs | 158 | 165 |
6 [Member] | Commercial Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans after net deferred loan fees and costs | 1,630 | 2,080 |
7 [Member] | Commercial and Industrial [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans after net deferred loan fees and costs | 203 | 230 |
7 [Member] | Commercial Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans after net deferred loan fees and costs | 605 | 709 |
Agricultural Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans after net deferred loan fees and costs | 54,995 | 50,895 | 48,812
Agricultural Real Estate [Member] | 1-2 [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans after net deferred loan fees and costs | 5,527 | 4,319 |
Agricultural Real Estate [Member] | 3 [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans after net deferred loan fees and costs | 15,598 | 15,780 |
Agricultural Real Estate [Member] | 4 [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans after net deferred loan fees and costs | 33,358 | 30,472 |
Agricultural Real Estate [Member] | 5 [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans after net deferred loan fees and costs | 84 | 111 |
Agricultural Real Estate [Member] | 6 [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans after net deferred loan fees and costs | 428 | 213 |
Agricultural [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans after net deferred loan fees and costs | 73,310 | 74,611 | $ 67,221
Agricultural [Member] | 1-2 [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans after net deferred loan fees and costs | 10,866 | 11,490 |
Agricultural [Member] | 3 [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans after net deferred loan fees and costs | 19,901 | 26,871 |
Agricultural [Member] | 4 [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans after net deferred loan fees and costs | 42,100 | 36,225 |
Agricultural [Member] | 5 [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans after net deferred loan fees and costs | 422 |  |
Agricultural [Member] | 7 [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans after net deferred loan fees and costs | 21 | 25 |
Industrial Development Bonds [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans after net deferred loan fees and costs | 6,649 | 4,698 |
Industrial Development Bonds [Member] | 3 [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans after net deferred loan fees and costs | 3,207 | 4,289 |
Industrial Development Bonds [Member] | 4 [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans after net deferred loan fees and costs | $ 3,442 | $ 409 |

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