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Allowance for Credit Losses - Summary of Balance of Loans Individually Evaluated vs. Collectively Evaluated for Impairment (Detail) - USD ($) $ in Thousands | Jun. 30, 2023 | Dec. 31, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | --- | --- | --- | ---
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |
Allowance for Loan Losses, Ending balance | $ 10,228 | $ 4,666 | $ 3,890 | $ 3,443 | $ 3,152
Allowance for Loan Losses, Ending balance: individually evaluated for impairment |  | 20 |  |  |
Allowance for Loan Losses, Ending balance: collectively evaluated for impairment |  | 4,646 |  |  |
Loans, Ending balance | 969,170 | 927,615 |  |  |
Loans, Ending balance: individually evaluated for impairment |  | 7,313 |  |  |
Ending balance: loans acquired with deteriorated credit quality |  | 2,409 |  |  |
Loans, Ending balance: collectively evaluated for impairment |  | 917,893 |  |  |
Agriculture Loans [Member] |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |
Allowance for Loan Losses, Ending balance |  | 33 | 17 | 20 | 23
Allowance for Loan Losses, Ending balance: individually evaluated for impairment |  | 0 |  |  |
Allowance for Loan Losses, Ending balance: collectively evaluated for impairment |  | 33 |  |  |
Loans, Ending balance |  | 15,591 |  |  |
Loans, Ending balance: individually evaluated for impairment |  | 300 |  |  |
Ending balance: loans acquired with deteriorated credit quality |  | 0 |  |  |
Loans, Ending balance: collectively evaluated for impairment |  | 15,291 |  |  |
Commercial and PPP Loans [Member] |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |
Allowance for Loan Losses, Ending balance |  | 583 | 506 | 585 | 582
Allowance for Loan Losses, Ending balance: individually evaluated for impairment |  | 20 |  |  |
Allowance for Loan Losses, Ending balance: collectively evaluated for impairment |  | 563 |  |  |
Loans, Ending balance |  | 104,755 |  |  |
Loans, Ending balance: individually evaluated for impairment |  | 55 |  |  |
Ending balance: loans acquired with deteriorated credit quality |  | 0 |  |  |
Loans, Ending balance: collectively evaluated for impairment |  | 104,700 |  |  |
Commercial Real Estate Loans [Member] |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |
Allowance for Loan Losses, Ending balance |  | 2,462 | 1,786 | 1,070 | 799
Allowance for Loan Losses, Ending balance: individually evaluated for impairment |  | 0 |  |  |
Allowance for Loan Losses, Ending balance: collectively evaluated for impairment |  | 2,462 |  |  |
Loans, Ending balance |  | 540,914 |  |  |
Loans, Ending balance: individually evaluated for impairment |  | 2,306 |  |  |
Ending balance: loans acquired with deteriorated credit quality |  | 2,227 |  |  |
Loans, Ending balance: collectively evaluated for impairment |  | 536,381 |  |  |
Residential Real Estate Loans [Member] |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |
Allowance for Loan Losses, Ending balance |  | 1,536 | 1,547 | 1,728 | 1,634
Allowance for Loan Losses, Ending balance: individually evaluated for impairment |  | 0 |  |  |
Allowance for Loan Losses, Ending balance: collectively evaluated for impairment |  | 1,536 |  |  |
Loans, Ending balance |  | 250,832 |  |  |
Loans, Ending balance: individually evaluated for impairment |  | 4,652 |  |  |
Ending balance: loans acquired with deteriorated credit quality |  | 182 |  |  |
Loans, Ending balance: collectively evaluated for impairment |  | 245,998 |  |  |
Consumer Loans [Member] |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |
Allowance for Loan Losses, Ending balance |  | 40 | 21 | 13 | 22
Allowance for Loan Losses, Ending balance: individually evaluated for impairment |  | 0 |  |  |
Allowance for Loan Losses, Ending balance: collectively evaluated for impairment |  | 40 |  |  |
Loans, Ending balance | 3,929 | 10,057 |  |  |
Loans, Ending balance: individually evaluated for impairment |  | 0 |  |  |
Ending balance: loans acquired with deteriorated credit quality |  | 0 |  |  |
Loans, Ending balance: collectively evaluated for impairment |  | 10,057 |  |  |
Municipal Loans [Member] |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |
Allowance for Loan Losses, Ending balance |  | 12 | 13 | 15 | 15
Allowance for Loan Losses, Ending balance: individually evaluated for impairment |  | 0 |  |  |
Allowance for Loan Losses, Ending balance: collectively evaluated for impairment |  | 12 |  |  |
Loans, Ending balance | $ 11,308 | 5,466 |  |  |
Loans, Ending balance: individually evaluated for impairment |  | 0 |  |  |
Ending balance: loans acquired with deteriorated credit quality |  | 0 |  |  |
Loans, Ending balance: collectively evaluated for impairment |  | 5,466 |  |  |
Unallocated [Member] |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |
Allowance for Loan Losses, Ending balance |  | 0 | $ 0 | $ 12 | $ 77
Allowance for Loan Losses, Ending balance: individually evaluated for impairment |  | 0 |  |  |
Allowance for Loan Losses, Ending balance: collectively evaluated for impairment |  | $ 0 |  |  |

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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 -Name Accounting Standards Codification -Section 50 -Paragraph 11B -Subparagraph (g) -SubTopic 10 -Topic 310 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481962/310-10-50-11B + 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 -Name Accounting Standards Codification -Section 50 -Paragraph 11B -Subparagraph (g) -SubTopic 10 -Topic 310 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481962/310-10-50-11B + 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://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(1)(ii) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481696/310-30-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 11B -Subparagraph (c)(1) -SubTopic 10 -Topic 310 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481962/310-10-50-11B Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 11B -Subparagraph (g) -SubTopic 10 -Topic 310 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481962/310-10-50-11B Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Name Accounting Standards Codification -Section S99 -Paragraph 4 -Subparagraph (SAB Topic 6.L.1) -SubTopic 10 -Topic 310 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480418/310-10-S99-4 + Details
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