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Loans - Risk Category of Loans by Portfolio Class (Detail) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018 | Jun. 30, 2018
--- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans after net deferred loan fees and costs | $ 1,091,131 | $ 846,374 | $ 831,015
Agricultural Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans after net deferred loan fees and costs | 193,616 | 68,588 | 69,676
Agricultural [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans after net deferred loan fees and costs | 113,906 | 108,616 | 104,980
Commercial Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans after net deferred loan fees and costs | 442,538 | 419,131 | $ 410,886
Commercial and Industrial [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans after net deferred loan fees and costs | 125,673 | 121,863 |
Other Loan [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans after net deferred loan fees and costs | 7,341 | 5,889 |
1-2 [Member] | Agricultural Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans after net deferred loan fees and costs | 33,993 | 4,442 |
1-2 [Member] | Agricultural [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans after net deferred loan fees and costs | 7,892 | 5,753 |
1-2 [Member] | Commercial Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans after net deferred loan fees and costs | 7,724 | 4,698 |
1-2 [Member] | Commercial and Industrial [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans after net deferred loan fees and costs | 4,394 | 3,199 |
3 [Member] | Agricultural Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans after net deferred loan fees and costs | 53,521 | 14,118 |
3 [Member] | Agricultural [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans after net deferred loan fees and costs | 40,275 | 38,852 |
3 [Member] | Commercial Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans after net deferred loan fees and costs | 83,706 | 64,341 |
3 [Member] | Commercial and Industrial [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans after net deferred loan fees and costs | 19,312 | 16,284 |
3 [Member] | Other Loan [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans after net deferred loan fees and costs | 2,463 | 3,135 |
4 [Member] | Agricultural Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans after net deferred loan fees and costs | 84,260 | 49,596 |
4 [Member] | Agricultural [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans after net deferred loan fees and costs | 60,437 | 63,380 |
4 [Member] | Commercial Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans after net deferred loan fees and costs | 341,424 | 346,072 |
4 [Member] | Commercial and Industrial [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans after net deferred loan fees and costs | 95,720 | 100,644 |
4 [Member] | Other Loan [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans after net deferred loan fees and costs | 4,878 | 2,754 |
5 [Member] | Agricultural Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans after net deferred loan fees and costs | 17,548 | 422 |
5 [Member] | Agricultural [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans after net deferred loan fees and costs | 5,055 | 631 |
5 [Member] | Commercial Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans after net deferred loan fees and costs | 8,046 | 2,171 |
5 [Member] | Commercial and Industrial [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans after net deferred loan fees and costs | 4,753 | 308 |
6 [Member] | Agricultural Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans after net deferred loan fees and costs | 4,294 | 10 |
6 [Member] | Agricultural [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans after net deferred loan fees and costs | 247 |  |
6 [Member] | Commercial Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans after net deferred loan fees and costs | 1,638 | 1,849 |
6 [Member] | Commercial and Industrial [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans after net deferred loan fees and costs | 615 | 542 |
7 [Member] | Commercial and Industrial [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans after net deferred loan fees and costs | $ 879 | $ 886 |

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