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Loans - Contractual Aging of Recorded Investment in Past Due Loans by Portfolio Classification of Loans (Detail) - USD ($) $ in Thousands | Sep. 30, 2022 | Dec. 31, 2021 | Sep. 30, 2021
--- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans after net deferred loan fees and costs | $ 2,142,616 | $ 1,857,419 | $ 1,495,562
Recorded Investment > 90 Days and Accruing | 0 | 0 | 0
30 to 59 Days Past Due [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 1,898 | 749 |
60 to 89 Days Past Due [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 568 | 131 |
Greater Than 90 Days [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 2,847 | 575 |
Past Due [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 5,313 | 1,455 |
Current [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 2,137,303 | 1,855,964 |
Consumer Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans after net deferred loan fees and costs | 416,044 | 395,805 | 202,370
Consumer Real Estate [Member] | 30 to 59 Days Past Due [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 1,056 | 228 |
Consumer Real Estate [Member] | 60 to 89 Days Past Due [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 167 |  |
Consumer Real Estate [Member] | Greater Than 90 Days [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 216 | 246 |
Consumer Real Estate [Member] | Past Due [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 1,439 | 474 |
Consumer Real Estate [Member] | Current [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 414,605 | 395,331 |
Agricultural Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans after net deferred loan fees and costs | 204,787 | 198,033 | 179,051
Agricultural Real Estate [Member] | 30 to 59 Days Past Due [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 189 | 436 |
Agricultural Real Estate [Member] | 60 to 89 Days Past Due [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 216 |  |
Agricultural Real Estate [Member] | Greater Than 90 Days [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 1,550 |  |
Agricultural Real Estate [Member] | Past Due [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 1,955 | 436 |
Agricultural Real Estate [Member] | Current [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 202,832 | 197,597 |
Agricultural [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans after net deferred loan fees and costs | 128,818 | 118,504 | 105,722
Agricultural [Member] | 30 to 59 Days Past Due [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 435 |  |
Agricultural [Member] | 60 to 89 Days Past Due [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 88 |  |
Agricultural [Member] | Greater Than 90 Days [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 831 |  |
Agricultural [Member] | Past Due [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 1,354 |  |
Agricultural [Member] | Current [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 127,464 | 118,504 |
Commercial Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans after net deferred loan fees and costs | 1,061,904 | 847,110 | 727,418
Commercial Real Estate [Member] | 30 to 59 Days Past Due [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 1 |  |
Commercial Real Estate [Member] | Greater Than 90 Days [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 180 | 180 |
Commercial Real Estate [Member] | Past Due [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 181 | 180 |
Commercial Real Estate [Member] | Current [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 1,061,723 | 846,930 |
Commercial and Industrial [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans after net deferred loan fees and costs | 260,000 | 240,138 | 225,382
Commercial and Industrial [Member] | 30 to 59 Days Past Due [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 203 | 21 |
Commercial and Industrial [Member] | 60 to 89 Days Past Due [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 52 | 131 |
Commercial and Industrial [Member] | Greater Than 90 Days [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 23 | 149 |
Commercial and Industrial [Member] | Past Due [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 278 | 301 |
Commercial and Industrial [Member] | Current [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 259,722 | 239,837 |
Consumer [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans after net deferred loan fees and costs | 71,063 | 57,829 | $ 55,619
Consumer [Member] | 30 to 59 Days Past Due [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 14 | 64 |
Consumer [Member] | 60 to 89 Days Past Due [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 45 |  |
Consumer [Member] | Greater Than 90 Days [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 47 |  |
Consumer [Member] | Past Due [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 106 | 64 |
Consumer [Member] | Current [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | $ 70,957 | $ 57,765 |

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