Allowance for Loan Losses - Schedule of Loans and Reserve Balances by Loan Segment Both Individually and Collectively Evaluated for Impairment (Detail) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021	Dec. 31, 2020
Financing Receivable Allowance For Credit Losses [Line Items]
Individually Evaluated, Reserve	$ 243	$ 214
Individually Evaluated, Loans	4,091	4,708
Collectively Evaluated, Reserve	3,913	3,812
Collectively Evaluated, Loans	441,833	416,071
Total Reserve	4,156	4,026	$ 4,252	$ 4,402
Total Loans	445,924	420,779
Commercial [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Individually Evaluated, Reserve	130	102
Individually Evaluated, Loans	2,146	2,573
Collectively Evaluated, Reserve	2,496	2,327
Collectively Evaluated, Loans	288,416	269,876
Total Reserve	2,626	2,429	2,555	2,753
Total Loans	290,562	272,449
Non-Commercial [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Individually Evaluated, Reserve	113	112
Individually Evaluated, Loans	1,945	2,135
Collectively Evaluated, Reserve	1,417	1,485
Collectively Evaluated, Loans	153,417	146,195
Total Reserve	1,530	1,597	$ 1,697	$ 1,649
Total Loans	$ 155,362	$ 148,330

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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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 and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements.

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