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Leases - Components of lease costs and supplemental information related to leases (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Lease Assets and Liabilities          
ROU assets $ 20,304   $ 20,304   $ 19,112
Total lease liabilities 22,039   22,039   $ 21,164
Lease Cost          
Operating lease expense 1,681 $ 1,623 3,343 $ 3,246  
Sublease income 0 0 0 0  
Total lease expense 1,681 1,623 3,343 3,246  
Other Information          
Operating cash outflows from operating leases, net $ 1,845 $ 1,869 $ 3,664 $ 3,804  
Lease Term and Discount Rate          
Weighted average remaining lease term (years) 4 years 4 months 28 days   4 years 4 months 28 days   4 years 1 month 28 days
Weighted average discount rate 2.51%   2.51%   2.80%