Allowances for Loan Losses - Summary of Balance of Loans Individually Evaluated vs. Collectively Evaluated for Impairment (Detail) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Loans and Leases Receivable Disclosure [Line Items]
Allowance for Loan Losses, Ending balance	$ 4,666	$ 3,152	$ 2,789
Allowance for Loan Losses, Ending balance: individually evaluated for impairment	20	0
Allowance for Loan Losses, Ending balance: collectively evaluated for impairment	4,646	3,152
Loans, Ending balance	927,615	715,039
Loans, Ending balance: individually evaluated for impairment	7,313	751
Ending balance: loans acquired with deteriorated credit quality	2,409	5,556
Loans, Ending balance: collectively evaluated for impairment	917,893	708,732
Agriculture Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Allowance for Loan Losses, Ending balance	33	23	120
Allowance for Loan Losses, Ending balance: individually evaluated for impairment	0	0
Allowance for Loan Losses, Ending balance: collectively evaluated for impairment	33	23
Loans, Ending balance	15,591	9,341
Loans, Ending balance: individually evaluated for impairment	300	0
Ending balance: loans acquired with deteriorated credit quality	0	0
Loans, Ending balance: collectively evaluated for impairment	15,291	9,341
Commercial and PPP Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Allowance for Loan Losses, Ending balance	583	582	290
Allowance for Loan Losses, Ending balance: individually evaluated for impairment	20	0
Allowance for Loan Losses, Ending balance: collectively evaluated for impairment	563	582
Loans, Ending balance	104,755	122,378
Loans, Ending balance: individually evaluated for impairment	55	42
Ending balance: loans acquired with deteriorated credit quality	0	512
Loans, Ending balance: collectively evaluated for impairment	104,700	121,824
Commercial Real Estate Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Allowance for Loan Losses, Ending balance	2,462	799	314
Allowance for Loan Losses, Ending balance: individually evaluated for impairment	0	0
Allowance for Loan Losses, Ending balance: collectively evaluated for impairment	2,462	799
Loans, Ending balance	540,914	338,749
Loans, Ending balance: individually evaluated for impairment	2,306	0
Ending balance: loans acquired with deteriorated credit quality	2,227	4,394
Loans, Ending balance: collectively evaluated for impairment	536,381	334,355
Residential Real Estate Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Allowance for Loan Losses, Ending balance	1,536	1,634	1,702
Allowance for Loan Losses, Ending balance: individually evaluated for impairment	0	0
Allowance for Loan Losses, Ending balance: collectively evaluated for impairment	1,536	1,634
Loans, Ending balance	250,832	231,302
Loans, Ending balance: individually evaluated for impairment	4,652	709
Ending balance: loans acquired with deteriorated credit quality	182	650
Loans, Ending balance: collectively evaluated for impairment	245,998	229,943
Consumer Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Allowance for Loan Losses, Ending balance	40	22	35
Allowance for Loan Losses, Ending balance: individually evaluated for impairment	0	0
Allowance for Loan Losses, Ending balance: collectively evaluated for impairment	40	22
Loans, Ending balance	10,057	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	10,057	7,087
Municipal Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Allowance for Loan Losses, Ending balance	12	15	18
Allowance for Loan Losses, Ending balance: individually evaluated for impairment	0	0
Allowance for Loan Losses, Ending balance: collectively evaluated for impairment	12	15
Loans, Ending balance	5,466	6,182
Loans, Ending balance: individually evaluated for impairment	0	0
Ending balance: loans acquired with deteriorated credit quality		0
Loans, Ending balance: collectively evaluated for impairment	5,466	6,182
Unallocated [Member]
Loans and Leases Receivable Disclosure [Line Items]
Allowance for Loan Losses, Ending balance	0	77	$ 310
Allowance for Loan Losses, Ending balance: individually evaluated for impairment	0	0
Allowance for Loan Losses, Ending balance: collectively evaluated for impairment	$ 0	$ 77

Financing receivable loans acquired with deteriorated credit quality.

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- Definition

The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment.

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Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment.

+ References

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- Definition

The balance of financing receivables that were collectively evaluated for impairment.

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The balance of financing receivables that were individually evaluated for impairment.

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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.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

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