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Loans - Recorded Investment in Nonaccrual Loans by Portfolio Class of Loans (Detail) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Investment in nonaccrual loans | $ 8,076 | $ 9,404
Consumer Real Estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Investment in nonaccrual loans | 824 | 1,546
Agricultural Real Estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Investment in nonaccrual loans | 6,477 | 5,575
Agricultural [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Investment in nonaccrual loans | 20 | 307
Commercial Real Estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Investment in nonaccrual loans | 600 | 665
Commercial and Industrial [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Investment in nonaccrual loans | 149 | 1,296
Consumer [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Investment in nonaccrual loans | $ 6 | $ 15

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