The valuation allowance for financing receivables that are expected to be uncollectible that were collectively 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 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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Allowances for Loan Losses - Summary of Balance of Loans Individually Evaluated vs. Collectively Evaluated for Impairment (Detail) - USD ($) $ in Thousands	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019
Loans and Leases Receivable Disclosure [Line Items]
Allowance for Loan Losses, Ending balance	$ 4,800	$ 4,386	$ 4,177	$ 3,766	$ 3,644	$ 1,689
Allowance for Loan Losses, Ending balance: individually evaluated for impairment	102		132
Allowance for Loan Losses, Ending balance: collectively evaluated for impairment	4,698		4,045
Loans, Ending balance	415,807		328,247
Loans, Ending balance: individually evaluated for impairment	6,692		1,645
Loans, Ending balance: collectively evaluated for impairment	409,115		326,602
Commercial and Industrial [Member]
Loans and Leases Receivable Disclosure [Line Items]
Allowance for Loan Losses, Ending balance	976	901	1,002	940	904	623
Allowance for Loan Losses, Ending balance: individually evaluated for impairment	45		111
Allowance for Loan Losses, Ending balance: collectively evaluated for impairment	931		891
Loans, Ending balance	129,835		101,370
Loans, Ending balance: individually evaluated for impairment	950		1,081
Loans, Ending balance: collectively evaluated for impairment	128,885		100,289
Construction and Land Development [Member]
Loans and Leases Receivable Disclosure [Line Items]
Allowance for Loan Losses, Ending balance	492	408	397	326	226	170
Allowance for Loan Losses, Ending balance: individually evaluated for impairment	0		0
Allowance for Loan Losses, Ending balance: collectively evaluated for impairment	492		397
Loans, Ending balance	25,177		20,935
Loans, Ending balance: individually evaluated for impairment	0		0
Loans, Ending balance: collectively evaluated for impairment	25,177		20,935
Real Estate Commercial [Member]
Loans and Leases Receivable Disclosure [Line Items]
Allowance for Loan Losses, Ending balance	2,520	2,343	2,082	1,765	1,638	598
Allowance for Loan Losses, Ending balance: individually evaluated for impairment	37		0
Allowance for Loan Losses, Ending balance: collectively evaluated for impairment	2,483		2,082
Loans, Ending balance	193,488		145,800
Loans, Ending balance: individually evaluated for impairment	4,916		230
Loans, Ending balance: collectively evaluated for impairment	188,572		145,570
Real Estate Residential [Member]
Loans and Leases Receivable Disclosure [Line Items]
Allowance for Loan Losses, Ending balance	510	484	418	497	526	214
Allowance for Loan Losses, Ending balance: individually evaluated for impairment	17		18
Allowance for Loan Losses, Ending balance: collectively evaluated for impairment	493		400
Loans, Ending balance	41,891		37,302
Loans, Ending balance: individually evaluated for impairment	823		331
Loans, Ending balance: collectively evaluated for impairment	41,068		36,971
Real Estate Home Equity [Member]
Loans and Leases Receivable Disclosure [Line Items]
Allowance for Loan Losses, Ending balance	255	219	242	97	103	45
Allowance for Loan Losses, Ending balance: individually evaluated for impairment	0		0
Allowance for Loan Losses, Ending balance: collectively evaluated for impairment	255		242
Loans, Ending balance	21,987		20,218
Loans, Ending balance: individually evaluated for impairment	0		0
Loans, Ending balance: collectively evaluated for impairment	21,987		20,218
Consumer Other [Member]
Loans and Leases Receivable Disclosure [Line Items]
Allowance for Loan Losses, Ending balance	47	31	35	14	76	9
Allowance for Loan Losses, Ending balance: individually evaluated for impairment	3		3
Allowance for Loan Losses, Ending balance: collectively evaluated for impairment	44		32
Loans, Ending balance	3,429		2,622
Loans, Ending balance: individually evaluated for impairment	3		3
Loans, Ending balance: collectively evaluated for impairment	3,426		2,619
Unallocated [Member]
Loans and Leases Receivable Disclosure [Line Items]
Allowance for Loan Losses, Ending balance	0	$ 0	1	$ 127	$ 171	$ 30
Allowance for Loan Losses, Ending balance: individually evaluated for impairment	0		0
Allowance for Loan Losses, Ending balance: collectively evaluated for impairment	$ 0		$ 1