Loans - Summary of Activity in Allowance for Loan and Lease Losses (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Loans and Leases Receivable Disclosure [Line Items]
Beginning balance	$ 3,017	$ 2,699	$ 2,858	$ 2,703
Provision for loan losses	105	0	210	0
Loans charged-off	(1)	(1)	(4)	(17)
Recoveries of loans previously charged off	11	34	68	46
Ending balance	3,132	2,732	3,132	2,732
Commercial [Member]
Loans and Leases Receivable Disclosure [Line Items]
Beginning balance	1,814	1,614	1,657	1,609
Provision for loan losses	105		210
Loans charged-off	0	0	0	0
Recoveries of loans previously charged off	5	4	57	9
Ending balance	1,924	1,618	1,924	1,618
Residential [Member]
Loans and Leases Receivable Disclosure [Line Items]
Beginning balance	745	745	745	745
Provision for loan losses	0		0
Loans charged-off	0	0	0	0
Recoveries of loans previously charged off	0	0	0	0
Ending balance	745	745	745	745
Consumer [Member]
Loans and Leases Receivable Disclosure [Line Items]
Beginning balance	458	340	456	349
Provision for loan losses	0		0
Loans charged-off	(1)	(1)	(4)	(17)
Recoveries of loans previously charged off	6	30	11	37
Ending balance	$ 463	$ 369	$ 463	$ 369