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Allowances for Loan Losses - Summary of Classes of the Loan Portfolio Summarized by the Internal Risk Rating System (Detail) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Loans and Leases Receivable Disclosure [Line Items] |  |
Loans and Leases Receivable, Gross | $ 731,080 | $ 715,039
Agriculture Loans [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Loans and Leases Receivable, Gross | 8,111 | 9,341
Commercial and PPP Loans [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Loans and Leases Receivable, Gross | 104,700 | 122,378
Commercial Real Estate Loans [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Loans and Leases Receivable, Gross | 353,559 | 338,749
Residential Real Estate Loans [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Loans and Leases Receivable, Gross | 252,158 | 231,302
Consumer Loans [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Loans and Leases Receivable, Gross | 6,359 | 7,087
Municipal Loans [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Loans and Leases Receivable, Gross | 6,193 | 6,182
Pass [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Loans and Leases Receivable, Gross | 718,372 | 701,348
Pass [Member] | Agriculture Loans [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Loans and Leases Receivable, Gross | 7,861 | 9,341
Pass [Member] | Commercial and PPP Loans [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Loans and Leases Receivable, Gross | 98,520 | 117,918
Pass [Member] | Commercial Real Estate Loans [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Loans and Leases Receivable, Gross | 350,995 | 332,156
Pass [Member] | Residential Real Estate Loans [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Loans and Leases Receivable, Gross | 248,444 | 228,664
Pass [Member] | Consumer Loans [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Loans and Leases Receivable, Gross | 6,359 | 7,087
Pass [Member] | Municipal Loans [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Loans and Leases Receivable, Gross | 6,193 | 6,182
Special Mention [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Loans and Leases Receivable, Gross | 9,017 | 7,491
Special Mention [Member] | Agriculture Loans [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Loans and Leases Receivable, Gross | 0 |
Special Mention [Member] | Commercial and PPP Loans [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Loans and Leases Receivable, Gross | 5,504 | 3,757
Special Mention [Member] | Commercial Real Estate Loans [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Loans and Leases Receivable, Gross | 1,965 | 2,077
Special Mention [Member] | Residential Real Estate Loans [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Loans and Leases Receivable, Gross | 1,548 | 1,657
Special Mention [Member] | Consumer Loans [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Loans and Leases Receivable, Gross | 0 |
Special Mention [Member] | Municipal Loans [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Loans and Leases Receivable, Gross | 0 |
Substandard [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Loans and Leases Receivable, Gross | 3,691 | 6,200
Substandard [Member] | Agriculture Loans [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Loans and Leases Receivable, Gross | 250 |
Substandard [Member] | Commercial and PPP Loans [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Loans and Leases Receivable, Gross | 676 | 703
Substandard [Member] | Commercial Real Estate Loans [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Loans and Leases Receivable, Gross | 599 | 4,516
Substandard [Member] | Residential Real Estate Loans [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Loans and Leases Receivable, Gross | 2,166 | 981
Substandard [Member] | Consumer Loans [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Loans and Leases Receivable, Gross | 0 |
Substandard [Member] | Municipal Loans [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Loans and Leases Receivable, Gross | 0 |
Doubtful [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Loans and Leases Receivable, Gross | 0 |
Doubtful [Member] | Agriculture Loans [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Loans and Leases Receivable, Gross | 0 |
Doubtful [Member] | Commercial and PPP Loans [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Loans and Leases Receivable, Gross | 0 |
Doubtful [Member] | Commercial Real Estate Loans [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Loans and Leases Receivable, Gross | 0 |
Doubtful [Member] | Residential Real Estate Loans [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Loans and Leases Receivable, Gross | 0 |
Doubtful [Member] | Consumer Loans [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Loans and Leases Receivable, Gross | 0 |
Doubtful [Member] | Municipal Loans [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Loans and Leases Receivable, Gross | $ 0 |

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