Leases - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Schedule Of Operating Leases [Line Items]
Operating lease extension period	5 years
Operating lease right of use asset	$ 409
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Accrued interest receivable and other assets
Operating lease liabilities	$ 400
Operating Lease, Liability, Statement of Financial Position [Extensible List]	Accrued interest payable and other liabilities
Operating lease cost	$ 105	$ 105	$ 71
Minimum [Member]
Schedule Of Operating Leases [Line Items]
Remaining lease term - operating leases in years	3 years
Maximum [Member]
Schedule Of Operating Leases [Line Items]
Remaining lease term - operating leases in years	5 years