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Leases - Components of lease costs and supplemental information related to leases (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Lease Assets and Liabilities          
ROU assets $ 19,403   $ 19,403   $ 19,112
Total lease liabilities 21,073   21,073   $ 21,164
Lease Cost          
Operating lease expense 1,634 $ 1,654 4,977 $ 4,900  
Sublease income 0 0 0 0  
Total lease expense 1,634 1,654 4,977 4,900  
Other Information          
Operating cash outflows from operating leases, net $ 1,700 $ 1,826 $ 5,364 $ 5,630  
Lease Term and Discount Rate          
Weighted average remaining lease term (years) 4 years 3 months 29 days   4 years 3 months 29 days   4 years 1 month 28 days
Weighted average discount rate 2.47%   2.47%   2.80%