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Leases - Components of lease costs and supplemental information related to leases (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Lease Assets and Liabilities      
Operating Lease, Right-of-Use Asset $ 19,274 $ 19,112  
Total lease liabilities $ 20,864 $ 21,164  
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] Other Liabilities Other Liabilities  
Lease Cost      
Operating lease expense [1] $ 6,613 $ 6,558  
Sublease income 0 0  
Total lease expense 6,613 6,558  
Other Information      
Operating cash outflows from operating leases, net $ 7,081 $ 7,387  
Lease Term and Discount Rate      
Weighted average remaining lease term (years)   4 years 3 months 3 days 4 years 1 month 28 days
Weighted average discount rate   2.41% 2.80%
[1] Includes short-term leases and variable lease costs, which are immaterial.