Leases - Components of lease costs and supplemental information related to leases (Detail) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Lease Assets and Liabilities
ROU assets		$ 24,503		$ 24,503		$ 19,274
Total lease liabilities		26,070		26,070		$ 20,864
Lease Cost
Operating lease expense	[1]	1,849	$ 1,681	3,695	$ 3,343
Sublease income		0	0	0	0
Total lease expense		1,849	1,681	3,695	3,343
Other Information
Operating cash outflows from operating leases, net		$ 1,860	$ 1,845	$ 3,711	$ 3,664
Lease Term and Discount Rate
Weighted average remaining lease term (years)		4 years 4 months 9 days		4 years 4 months 9 days		4 years 3 months 3 days
Weighted average discount rate		2.64%		2.64%		2.41%

[1] Includes short-term leases and variable lease costs, which are immaterial.