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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, 2020 | Dec. 31, 2019 | Sep. 30, 2019
--- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | $ 324 | $ 1,139 |
Current | 1,363,538 | 1,217,860 |
Loans after net deferred loan fees and costs | 1,363,862 | 1,218,999 | $ 1,158,696
Recorded Investment > 90 Days and Accruing | 408 | 0 | 0
30 to 59 Days Past Due [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 283 | 688 |
60 to 89 Days Past Due [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 41 | 451 |
Consumer Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 113 | 425 |
Current | 175,482 | 164,266 |
Loans after net deferred loan fees and costs | 175,595 | 164,691 | 158,458
Consumer Real Estate [Member] | 30 to 59 Days Past Due [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 80 | 355 |
Consumer Real Estate [Member] | 60 to 89 Days Past Due [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 33 | 70 |
Agricultural Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due |  | 107 |
Current | 192,577 | 198,752 |
Loans after net deferred loan fees and costs | 192,577 | 198,859 | 200,625
Agricultural Real Estate [Member] | 60 to 89 Days Past Due [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due |  | 107 |
Agricultural [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due |  | 85 |
Current | 103,476 | 111,864 |
Loans after net deferred loan fees and costs | 103,476 | 111,949 | 110,405
Agricultural [Member] | 30 to 59 Days Past Due [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due |  | 78 |
Agricultural [Member] | 60 to 89 Days Past Due [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due |  | 7 |
Commercial Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 169 |  |
Current | 593,767 | 550,082 |
Loans after net deferred loan fees and costs | 593,936 | 550,082 | 501,095
Commercial Real Estate [Member] | 30 to 59 Days Past Due [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 169 |  |
Commercial and Industrial [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due |  | 468 |
Current | 244,823 | 143,541 |
Loans after net deferred loan fees and costs | 244,823 | 144,009 | 138,395
Commercial and Industrial [Member] | 30 to 59 Days Past Due [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due |  | 201 |
Commercial and Industrial [Member] | 60 to 89 Days Past Due [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due |  | 267 |
Consumer [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 42 | 54 |
Current | 53,413 | 49,355 |
Loans after net deferred loan fees and costs | 53,455 | 49,409 | $ 49,718
Consumer [Member] | 30 to 59 Days Past Due [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 34 | $ 54 |
Consumer [Member] | 60 to 89 Days Past Due [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | $ 8 |  |

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