Allowances for Loan Losses - Summary of Balance of Loans Individually Evaluated vs. Collectively Evaluated for Impairment (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Loans and Leases Receivable Disclosure [Line Items]
Allowance for Loan Losses, Ending balance	$ 3,152	$ 2,789	$ 2,702
Allowance for Loan Losses, Ending balance: individually evaluated for impairment	0	0
Allowance for Loan Losses, Ending balance: collectively evaluated for impairment	3,152	2,789
Loans, Ending balance	715,039	236,840
Loans, Ending balance: individually evaluated for impairment	751	297
Ending balance: loans acquired with deteriorated credit quality	5,556
Loans, Ending balance: collectively evaluated for impairment	708,732	236,543
Agriculture Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Allowance for Loan Losses, Ending balance	23	120	152
Allowance for Loan Losses, Ending balance: individually evaluated for impairment	0	0
Allowance for Loan Losses, Ending balance: collectively evaluated for impairment	23	120
Loans, Ending balance	9,341	11,246
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	9,341	11,246
Commercial and PPP Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Allowance for Loan Losses, Ending balance	582	290	312
Allowance for Loan Losses, Ending balance: individually evaluated for impairment	0
Allowance for Loan Losses, Ending balance: collectively evaluated for impairment	582
Loans, Ending balance	122,378
Loans, Ending balance: individually evaluated for impairment	42
Ending balance: loans acquired with deteriorated credit quality	512
Loans, Ending balance: collectively evaluated for impairment	121,824
Commercial Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Allowance for Loan Losses, Ending balance		290
Allowance for Loan Losses, Ending balance: individually evaluated for impairment		0
Allowance for Loan Losses, Ending balance: collectively evaluated for impairment		290
Loans, Ending balance		21,534
Loans, Ending balance: individually evaluated for impairment		2
Loans, Ending balance: collectively evaluated for impairment		21,532
Commercial Real Estate Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Allowance for Loan Losses, Ending balance	799	314	255
Allowance for Loan Losses, Ending balance: individually evaluated for impairment	0	0
Allowance for Loan Losses, Ending balance: collectively evaluated for impairment	799	314
Loans, Ending balance	338,749	27,261
Loans, Ending balance: individually evaluated for impairment	0	0
Ending balance: loans acquired with deteriorated credit quality	4,394
Loans, Ending balance: collectively evaluated for impairment	334,355	27,261
Residential Real Estate Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Allowance for Loan Losses, Ending balance	1,634	1,702	1,707
Allowance for Loan Losses, Ending balance: individually evaluated for impairment	0	0
Allowance for Loan Losses, Ending balance: collectively evaluated for impairment	1,634	1,702
Loans, Ending balance	231,302	167,536
Loans, Ending balance: individually evaluated for impairment	709	295
Ending balance: loans acquired with deteriorated credit quality	650
Loans, Ending balance: collectively evaluated for impairment	229,943	167,241
Consumer Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Allowance for Loan Losses, Ending balance	22	35	43
Allowance for Loan Losses, Ending balance: individually evaluated for impairment	0	0
Allowance for Loan Losses, Ending balance: collectively evaluated for impairment	22	35
Loans, Ending balance	7,087	2,514
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	7,087	2,514
Municipal Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Allowance for Loan Losses, Ending balance	15	18	13
Allowance for Loan Losses, Ending balance: individually evaluated for impairment	0	0
Allowance for Loan Losses, Ending balance: collectively evaluated for impairment	15	18
Loans, Ending balance	6,182	6,749
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	6,182	6,749
Unallocated [Member]
Loans and Leases Receivable Disclosure [Line Items]
Allowance for Loan Losses, Ending balance	77	310	$ 220
Allowance for Loan Losses, Ending balance: individually evaluated for impairment	0	0
Allowance for Loan Losses, Ending balance: collectively evaluated for impairment	$ 77	$ 310

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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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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