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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, 2022 | Dec. 31, 2021 | Jun. 30, 2021
--- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans after net deferred loan fees and costs | $ 2,034,818 | $ 1,857,419 | $ 1,458,423
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 | 1,032 | 749 |
60 to 89 Days Past Due [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 2,336 | 131 |
Greater Than 90 Days [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 731 | 575 |
Past Due [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 4,099 | 1,455 |
Current [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 2,030,719 | 1,855,964 |
Consumer Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans after net deferred loan fees and costs | 410,468 | 395,805 | 194,574
Consumer Real Estate [Member] | 30 to 59 Days Past Due [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 964 | 228 |
Consumer Real Estate [Member] | 60 to 89 Days Past Due [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 52 |  |
Consumer Real Estate [Member] | Greater Than 90 Days [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 164 | 246 |
Consumer Real Estate [Member] | Past Due [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 1,180 | 474 |
Consumer Real Estate [Member] | Current [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 409,288 | 395,331 |
Agricultural Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans after net deferred loan fees and costs | 199,650 | 198,033 | 189,426
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] | 60 to 89 Days Past Due [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 | 1,550 | 436 |
Agricultural Real Estate [Member] | Current [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 198,100 | 197,597 |
Agricultural [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans after net deferred loan fees and costs | 127,340 | 118,504 | 100,905
Agricultural [Member] | 30 to 59 Days Past Due [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 42 |  |
Agricultural [Member] | 60 to 89 Days Past Due [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 662 |  |
Agricultural [Member] | Greater Than 90 Days [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 112 |  |
Agricultural [Member] | Past Due [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 816 |  |
Agricultural [Member] | Current [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 126,524 | 118,504 |
Commercial Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans after net deferred loan fees and costs | 977,588 | 847,110 | 689,728
Commercial Real Estate [Member] | 30 to 59 Days Past Due [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 15 |  |
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 | 195 | 180 |
Commercial Real Estate [Member] | Current [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 977,393 | 846,930 |
Commercial and Industrial [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans after net deferred loan fees and costs | 264,124 | 240,138 | 227,256
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 | 9 | 131 |
Commercial and Industrial [Member] | Greater Than 90 Days [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 275 | 149 |
Commercial and Industrial [Member] | Past Due [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 284 | 301 |
Commercial and Industrial [Member] | Current [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 263,840 | 239,837 |
Consumer [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans after net deferred loan fees and costs | 55,648 | 57,829 | $ 56,534
Consumer [Member] | 30 to 59 Days Past Due [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 11 | 64 |
Consumer [Member] | 60 to 89 Days Past Due [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 63 |  |
Consumer [Member] | Past Due [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 74 | 64 |
Consumer [Member] | Current [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | $ 55,574 | $ 57,765 |

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