Leases - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Lessee Lease Description [Line Items]
Lease expiration month and year	2027-08	2022-06
Future lease payments	$ 188,000	$ 16,000
Operating lease expense	$ 33,000	$ 32,000
Branch Office and Certain Equipment [Member]
Lessee Lease Description [Line Items]
Operating leases expiration beginning year	2023
Operating leases expiration ending year	2027
Operating lease option to extend	true
Operating lease, renewal term	4 years