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Allowances for Loan Losses - Summary of Balance of Loans Individually Evaluated vs. Collectively Evaluated for Impairment (Detail) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021 | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | --- | --- | ---
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |
Allowance for Loan Losses, Ending balance | $ 3,443 | $ 3,152 | $ 2,787 | $ 2,789
Allowance for Loan Losses, Ending balance: individually evaluated for impairment | 4 | 0 |  |
Allowance for Loan Losses, Ending balance: collectively evaluated for impairment | 3,439 | 3,152 |  |
Loans, Ending balance | 731,080 | 715,039 |  |
Loans, Ending balance: individually evaluated for impairment | 2,351 | 751 |  |
Ending balance: loans acquired with deteriorated credit quality | 5,564 | 5,556 |  |
Loans, Ending balance: collectively evaluated for impairment | 723,165 | 708,732 |  |
Agriculture Loans [Member] |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |
Allowance for Loan Losses, Ending balance | 20 | 23 | 105 | 120
Allowance for Loan Losses, Ending balance: individually evaluated for impairment | 0 | 0 |  |
Allowance for Loan Losses, Ending balance: collectively evaluated for impairment | 20 | 23 |  |
Loans, Ending balance | 8,111 | 9,341 |  |
Loans, Ending balance: individually evaluated for impairment | 250 | 0 |  |
Ending balance: loans acquired with deteriorated credit quality | 0 | 0 |  |
Loans, Ending balance: collectively evaluated for impairment | 7,861 | 9,341 |  |
Commercial and PPP Loans [Member] |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |
Allowance for Loan Losses, Ending balance | 585 | 582 |  |
Allowance for Loan Losses, Ending balance: individually evaluated for impairment | 0 | 0 |  |
Allowance for Loan Losses, Ending balance: collectively evaluated for impairment | 585 | 582 |  |
Loans, Ending balance | 104,700 | 122,378 |  |
Loans, Ending balance: individually evaluated for impairment | 37 | 42 |  |
Ending balance: loans acquired with deteriorated credit quality | 641 | 512 |  |
Loans, Ending balance: collectively evaluated for impairment | 104,022 | 121,824 |  |
Commercial Real Estate Loans [Member] |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |
Allowance for Loan Losses, Ending balance | 1,070 | 799 | 315 | 314
Allowance for Loan Losses, Ending balance: individually evaluated for impairment | 0 | 0 |  |
Allowance for Loan Losses, Ending balance: collectively evaluated for impairment | 1,070 | 799 |  |
Loans, Ending balance | 353,559 | 338,749 |  |
Loans, Ending balance: individually evaluated for impairment | 177 | 0 |  |
Ending balance: loans acquired with deteriorated credit quality | 4,329 | 4,394 |  |
Loans, Ending balance: collectively evaluated for impairment | 349,053 | 334,355 |  |
Residential Real Estate Loans [Member] |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |
Allowance for Loan Losses, Ending balance | 1,728 | 1,634 | 1,674 | 1,702
Allowance for Loan Losses, Ending balance: individually evaluated for impairment | 4 | 0 |  |
Allowance for Loan Losses, Ending balance: collectively evaluated for impairment | 1,724 | 1,634 |  |
Loans, Ending balance | 252,158 | 231,302 |  |
Loans, Ending balance: individually evaluated for impairment | 1,887 | 709 |  |
Ending balance: loans acquired with deteriorated credit quality | 594 | 650 |  |
Loans, Ending balance: collectively evaluated for impairment | 249,677 | 229,943 |  |
Consumer Loans [Member] |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |
Allowance for Loan Losses, Ending balance | 13 | 22 | 24 | 35
Allowance for Loan Losses, Ending balance: individually evaluated for impairment | 0 | 0 |  |
Allowance for Loan Losses, Ending balance: collectively evaluated for impairment | 13 | 22 |  |
Loans, Ending balance | 6,359 | 7,087 |  |
Loans, Ending balance: individually evaluated for impairment | 0 | 0 |  |
Ending balance: loans acquired with deteriorated credit quality | 0 | 0 |  |
Loans, Ending balance: collectively evaluated for impairment | 6,359 | 7,087 |  |
Municipal Loans [Member] |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |
Allowance for Loan Losses, Ending balance | 15 | 15 | 18 | 18
Allowance for Loan Losses, Ending balance: individually evaluated for impairment | 0 | 0 |  |
Allowance for Loan Losses, Ending balance: collectively evaluated for impairment | 15 | 15 |  |
Loans, Ending balance | 6,193 | 6,182 |  |
Loans, Ending balance: individually evaluated for impairment | 0 | 0 |  |
Ending balance: loans acquired with deteriorated credit quality | 0 | 0 |  |
Loans, Ending balance: collectively evaluated for impairment | 6,193 | 6,182 |  |
Unallocated [Member] |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |
Allowance for Loan Losses, Ending balance | 12 | 77 | $ 336 | $ 310
Allowance for Loan Losses, Ending balance: individually evaluated for impairment | 0 | 0 |  |
Allowance for Loan Losses, Ending balance: collectively evaluated for impairment | $ (12) | $ 77 |  |

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- Definition The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524 + Details
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- Definition Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524 + Details
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- Definition Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SAB Topic 6.L.1) -URI http://asc.fasb.org/extlink&oid=122038336&loc=d3e74567-122707 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(1)(ii) -URI http://asc.fasb.org/extlink&oid=121614798&loc=d3e15032-111544 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524 + Details
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