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Loans - Contractual Aging of Recorded Investment in Past Due Loans by Portfolio Classification of Loans (Detail) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans after net deferred loan fees and costs | $ 1,857,419 | $ 1,302,990
Recorded Investment > 90 Days and Accruing | 0 | 0
30 to 59 Days Past Due [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 749 | 322
60 to 89 Days Past Due [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 131 | 941
Greater Than 90 Days [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 575 | 2,464
Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 1,455 | 3,727
Current |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 1,855,964 | 1,299,263
Consumer Real Estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans after net deferred loan fees and costs | 395,805 | 175,316
Consumer Real Estate [Member] | 30 to 59 Days Past Due [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 228 | 269
Consumer Real Estate [Member] | 60 to 89 Days Past Due [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due |  | 191
Consumer Real Estate [Member] | Greater Than 90 Days [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 246 | 1,032
Consumer Real Estate [Member] | Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 474 | 1,492
Consumer Real Estate [Member] | Current |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 395,331 | 173,824
Agricultural Real Estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans after net deferred loan fees and costs | 198,033 | 188,826
Agricultural Real Estate [Member] | 30 to 59 Days Past Due [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 436 |
Agricultural Real Estate [Member] | Greater Than 90 Days [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due |  | 88
Agricultural Real Estate [Member] | Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 436 | 88
Agricultural Real Estate [Member] | Current |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 197,597 | 188,738
Agricultural [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans after net deferred loan fees and costs | 118,504 | 94,490
Agricultural [Member] | Greater Than 90 Days [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due |  | 176
Agricultural [Member] | Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due |  | 176
Agricultural [Member] | Current |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 118,504 | 94,314
Commercial Real Estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans after net deferred loan fees and costs | 847,110 | 587,654
Commercial Real Estate [Member] | Greater Than 90 Days [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 180 | 185
Commercial Real Estate [Member] | Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 180 | 185
Commercial Real Estate [Member] | Current |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 846,930 | 587,469
Commercial and Industrial [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans after net deferred loan fees and costs | 240,138 | 204,043
Commercial and Industrial [Member] | 30 to 59 Days Past Due [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 21 |
Commercial and Industrial [Member] | 60 to 89 Days Past Due [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 131 | 750
Commercial and Industrial [Member] | Greater Than 90 Days [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 149 | 983
Commercial and Industrial [Member] | Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 301 | 1,733
Commercial and Industrial [Member] | Current |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 239,837 | 202,310
Consumer [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans after net deferred loan fees and costs | 57,829 | 52,661
Consumer [Member] | 30 to 59 Days Past Due [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 64 | 53
Consumer [Member] | Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 64 | 53
Consumer [Member] | Current |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | $ 57,765 | $ 52,608

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