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Loans - Contractual Aging of Recorded Investment in Past Due Loans by Portfolio Classification of Loans (Detail) - USD ($) $ in Thousands | Jun. 30, 2023 | Dec. 31, 2022 | Jun. 30, 2022
--- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans after net deferred loan fees and costs | $ 2,515,793 | $ 2,356,387 | $ 2,034,818
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 | 7,573 | 3,197 |
60 to 89 Days Past Due [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 498 | 674 |
Greater Than 90 Days [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 1,613 | 2,154 |
Past Due [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 9,684 | 6,025 |
Current [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 2,506,109 | 2,350,362 |
Consumer Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 506,842 |  |
Loans after net deferred loan fees and costs | 506,842 | 494,423 | 410,468
Consumer Real Estate [Member] | 30 to 59 Days Past Due [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 1,287 | 1,536 |
Consumer Real Estate [Member] | 60 to 89 Days Past Due [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 5 | 635 |
Consumer Real Estate [Member] | Greater Than 90 Days [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 443 | 90 |
Consumer Real Estate [Member] | Past Due [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 1,735 | 2,261 |
Consumer Real Estate [Member] | Current [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 505,107 | 492,162 |
Agricultural Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans after net deferred loan fees and costs | 230,531 | 220,514 | 199,650
Agricultural Real Estate [Member] | 30 to 59 Days Past Due [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 5,047 | 118 |
Agricultural Real Estate [Member] | 60 to 89 Days Past Due [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 1 | 2 |
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 | 5,048 | 1,670 |
Agricultural Real Estate [Member] | Current [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 225,483 | 218,844 |
Agricultural [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 128,593 |  |
Loans after net deferred loan fees and costs | 128,593 | 128,926 | 127,340
Agricultural [Member] | 30 to 59 Days Past Due [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 750 | 433 |
Agricultural [Member] | 60 to 89 Days Past Due [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 462 |  |
Agricultural [Member] | Greater Than 90 Days [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due |  | 152 |
Agricultural [Member] | Past Due [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 1,212 | 585 |
Agricultural [Member] | Current [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 127,381 | 128,341 |
Commercial Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 1,278,445 |  |
Loans after net deferred loan fees and costs | 1,278,445 | 1,150,511 | 977,588
Commercial Real Estate [Member] | 30 to 59 Days Past Due [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 434 | 74 |
Commercial Real Estate [Member] | Greater Than 90 Days [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 255 | 180 |
Commercial Real Estate [Member] | Past Due [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 689 | 254 |
Commercial Real Estate [Member] | Current [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 1,277,756 | 1,150,257 |
Commercial and Industrial [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans after net deferred loan fees and costs | 282,244 | 272,119 | 264,124
Commercial and Industrial [Member] | 30 to 59 Days Past Due [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 26 | 953 |
Commercial and Industrial [Member] | Greater Than 90 Days [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 855 | 182 |
Commercial and Industrial [Member] | Past Due [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 881 | 1,135 |
Commercial and Industrial [Member] | Current [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 281,363 | 270,984 |
Consumer [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans after net deferred loan fees and costs | 89,138 | 89,894 | $ 55,648
Consumer [Member] | 30 to 59 Days Past Due [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 29 | 83 |
Consumer [Member] | 60 to 89 Days Past Due [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 30 | 37 |
Consumer [Member] | Greater Than 90 Days [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 60 |  |
Consumer [Member] | Past Due [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 119 | 120 |
Consumer [Member] | Current [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | $ 89,019 | $ 89,774 |

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