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Loans - Risk Category of Loans by Portfolio Class (Detail) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020 | Jun. 30, 2020
--- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans after net deferred loan fees and costs | $ 1,458,423 | $ 1,302,990 | $ 1,344,723
Agricultural Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans after net deferred loan fees and costs | 189,426 | 188,826 | 194,310
Agricultural [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans after net deferred loan fees and costs | 100,905 | 94,490 | 107,615
Commercial Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans after net deferred loan fees and costs | 689,728 | 587,654 | $ 588,176
Commercial and Industrial [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans after net deferred loan fees and costs | 213,707 | 188,286 |
Other Loan [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans after net deferred loan fees and costs | 13,549 | 15,757 |
1-2 [Member] | Agricultural Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans after net deferred loan fees and costs | 11,266 | 11,960 |
1-2 [Member] | Agricultural [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans after net deferred loan fees and costs | 3,678 | 5,093 |
1-2 [Member] | Commercial Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans after net deferred loan fees and costs | 11,506 | 11,001 |
1-2 [Member] | Commercial and Industrial [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans after net deferred loan fees and costs | 50,321 | 38,486 |
3 [Member] | Agricultural Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans after net deferred loan fees and costs | 42,763 | 38,306 |
3 [Member] | Agricultural [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans after net deferred loan fees and costs | 22,980 | 23,779 |
3 [Member] | Commercial Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans after net deferred loan fees and costs | 202,360 | 165,201 |
3 [Member] | Commercial and Industrial [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans after net deferred loan fees and costs | 36,000 | 26,515 |
3 [Member] | Other Loan [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans after net deferred loan fees and costs | 2,963 | 4,651 |
4 [Member] | Agricultural Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans after net deferred loan fees and costs | 115,726 | 112,465 |
4 [Member] | Agricultural [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans after net deferred loan fees and costs | 73,458 | 63,480 |
4 [Member] | Commercial Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans after net deferred loan fees and costs | 440,615 | 396,076 |
4 [Member] | Commercial and Industrial [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans after net deferred loan fees and costs | 120,761 | 114,108 |
4 [Member] | Other Loan [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans after net deferred loan fees and costs | 10,586 | 11,106 |
5 [Member] | Agricultural Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans after net deferred loan fees and costs | 5,411 | 7,478 |
5 [Member] | Agricultural [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans after net deferred loan fees and costs | 500 | 1,577 |
5 [Member] | Commercial Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans after net deferred loan fees and costs | 2,193 | 4,010 |
5 [Member] | Commercial and Industrial [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans after net deferred loan fees and costs | 2,507 | 3,266 |
6 [Member] | Agricultural Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans after net deferred loan fees and costs | 14,260 | 18,617 |
6 [Member] | Agricultural [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans after net deferred loan fees and costs | 289 | 561 |
6 [Member] | Commercial Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans after net deferred loan fees and costs | 33,054 | 11,366 |
6 [Member] | Commercial and Industrial [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans after net deferred loan fees and costs | 4,072 | 4,796 |
7 [Member] | Commercial and Industrial [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans after net deferred loan fees and costs | $ 46 | $ 1,115 |

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