Loans - Summary of Allowance for Loan and Lease Losses for Loans Evaluated Individually and Collectively for Impairment (Detail) - USD ($) $ in Thousands	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021
Loans and Leases Receivable Disclosure [Line Items]
Individually evaluated for impairment			$ 4,497
Collectively evaluated for impairment			357,450
Total loans			361,947
Collectively evaluated for impairment			3,203
Total allowance for loan losses	$ 3,643	$ 3,693	3,203	$ 3,132	$ 3,017	$ 2,858
Commercial [Member]
Loans and Leases Receivable Disclosure [Line Items]
Individually evaluated for impairment			3,525
Collectively evaluated for impairment			251,041
Total loans			254,566
Collectively evaluated for impairment			1,944
Total allowance for loan losses	2,632	2,669	1,944	1,924	1,814	1,657
Residential [Member]
Loans and Leases Receivable Disclosure [Line Items]
Individually evaluated for impairment			917
Collectively evaluated for impairment			87,775
Total loans			88,692
Collectively evaluated for impairment			752
Total allowance for loan losses	831	848	752	745	745	745
Consumer [Member]
Loans and Leases Receivable Disclosure [Line Items]
Individually evaluated for impairment			55
Collectively evaluated for impairment			18,634
Total loans			18,689
Collectively evaluated for impairment			507
Total allowance for loan losses	$ 180	$ 176	$ 507	$ 463	$ 458	$ 456