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

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.

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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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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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