Loans - Summary of Activity in Allowance for Loan and Lease Losses (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Loans and Leases Receivable Disclosure [Line Items]
Beginning balance	$ 2,858	$ 2,703
Provision for loan losses	222	30
Loans charged-off	(10)	(19)
Recoveries of loans previously charged off	133	144
Ending balance	3,203	2,858
Commercial [Member]
Loans and Leases Receivable Disclosure [Line Items]
Beginning balance	1,657	1,609
Provision for loan losses	222	30
Loans charged-off	0	0
Recoveries of loans previously charged off	65	18
Ending balance	1,944	1,657
Residential [Member]
Loans and Leases Receivable Disclosure [Line Items]
Beginning balance	745	745
Provision for loan losses	0	0
Loans charged-off	0	0
Recoveries of loans previously charged off	7	0
Ending balance	752	745
Consumer [Member]
Loans and Leases Receivable Disclosure [Line Items]
Beginning balance	456	349
Provision for loan losses	0	0
Loans charged-off	(10)	(19)
Recoveries of loans previously charged off	61	126
Ending balance	$ 507	$ 456