Leases - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2022 USD ($) OfficeLocation Branch	Mar. 31, 2021 USD ($)
Lessee Lease Description [Line Items]
Number of office locations leased | OfficeLocation	3
Number of branch locations leased | Branch	2
Lessee, Operating Lease, Existence of Option to Extend [true false]	true
Description of option to extend	Certain lease arrangements contain extension options which range from five to ten years at the then fair market rental rates.
Operating Lease, Liability	$ 2,141,000
Operating lease costs	99,000	$ 99,000
ASU 2016-02 [Member]
Lessee Lease Description [Line Items]
Operating Lease, Right-of-Use Asset	$ 2,000,000.0	$ 2,400,000
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Premises and equipment, net	Premises and equipment, net
Operating Lease, Liability	$ 2,100,000	$ 2,500,000
Minimum [Member]
Lessee Lease Description [Line Items]
Operating leases remaining term	4 years
Option to extend term	5 years
Maximum [Member]
Lessee Lease Description [Line Items]
Operating leases remaining term	7 years
Option to extend term	10 years