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Allowances for Loan Losses - Summary of Aging Analysis of the Recorded Investment of Past-Due Loans (Detail) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Purchased Credit Impaired Loans | $ 5,564 | $ 5,556
Loans receivable | 731,080 | 715,039
Total > 90 Days and Accruing | 0 | 762
Agriculture Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Purchased Credit Impaired Loans |  |
Loans receivable | 8,111 | 9,341
Total > 90 Days and Accruing | 0 |
Commercial and PPP Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Purchased Credit Impaired Loans | 641 | 512
Loans receivable | 104,700 | 122,378
Total > 90 Days and Accruing | 0 |
Commercial Real Estate Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Purchased Credit Impaired Loans | 4,329 | 4,394
Loans receivable | 353,559 | 338,749
Total > 90 Days and Accruing | 0 |
Residential Real Estate Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Purchased Credit Impaired Loans | 594 | 650
Loans receivable | 252,158 | 231,302
Total > 90 Days and Accruing | 0 | 762
Consumer Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Purchased Credit Impaired Loans |  |
Loans receivable | 6,359 | 7,087
Total > 90 Days and Accruing | 0 |
Municipal Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Purchased Credit Impaired Loans |  |
Loans receivable | 6,193 | 6,182
Total > 90 Days and Accruing | 0 |
30-59 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, Gross | 2,479 | 1,852
30-59 Days Past Due [Member] | Agriculture Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, Gross | 187 | 83
30-59 Days Past Due [Member] | Commercial and PPP Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, Gross | 33 | 66
30-59 Days Past Due [Member] | Commercial Real Estate Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, Gross |  | 245
30-59 Days Past Due [Member] | Residential Real Estate Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, Gross | 2,240 | 1,427
30-59 Days Past Due [Member] | Consumer Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, Gross | 19 | 31
30-59 Days Past Due [Member] | Municipal Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, Gross |  |
60-89 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, Gross | 26 | 213
60-89 Days Past Due [Member] | Agriculture Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, Gross |  |
60-89 Days Past Due [Member] | Commercial and PPP Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, Gross |  |
60-89 Days Past Due [Member] | Commercial Real Estate Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, Gross |  |
60-89 Days Past Due [Member] | Residential Real Estate Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, Gross | 25 | 211
60-89 Days Past Due [Member] | Consumer Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, Gross | 1 | 2
60-89 Days Past Due [Member] | Municipal Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, Gross |  |
90 Days or Greater Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, Gross | 516 | 869
90 Days or Greater Past Due [Member] | Agriculture Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, Gross |  |
90 Days or Greater Past Due [Member] | Commercial and PPP Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, Gross |  |
90 Days or Greater Past Due [Member] | Commercial Real Estate Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, Gross |  |
90 Days or Greater Past Due [Member] | Residential Real Estate Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, Gross | 516 | 869
90 Days or Greater Past Due [Member] | Consumer Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, Gross |  |
90 Days or Greater Past Due [Member] | Municipal Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, Gross |  |
Total Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, Gross | 3,021 | 2,934
Total Past Due [Member] | Agriculture Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, Gross | 187 | 83
Total Past Due [Member] | Commercial and PPP Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, Gross | 33 | 66
Total Past Due [Member] | Commercial Real Estate Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, Gross |  | 245
Total Past Due [Member] | Residential Real Estate Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, Gross | 2,781 | 2,507
Total Past Due [Member] | Consumer Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, Gross | 20 | 33
Total Past Due [Member] | Municipal Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, Gross |  |
Current [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, Gross | 722,495 | 706,549
Current [Member] | Agriculture Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, Gross | 7,924 | 9,258
Current [Member] | Commercial and PPP Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, Gross | 104,026 | 121,800
Current [Member] | Commercial Real Estate Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, Gross | 349,230 | 334,110
Current [Member] | Residential Real Estate Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, Gross | 248,783 | 228,145
Current [Member] | Consumer Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, Gross | 6,339 | 7,054
Current [Member] | Municipal Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, Gross | $ 6,193 | $ 6,182

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