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Leases - Balance Sheet Disclosures and Components of Lease Expense (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Leases [Abstract]          
Operating lease ROU assets $ 51,972   $ 51,972   $ 50,743
Operating lease liability $ 56,151   $ 56,151   $ 59,100
Weighted-average remaining lease term-operating leases (Year) 7 years 8 months 12 days   7 years 8 months 12 days   8 years 3 months 18 days
Weighted average discount rate-operating leases 3.20%   3.20%   3.20%
Operating lease cost $ 2,244 $ 1,897 $ 4,348 $ 3,800 $ 3,782
Short-term lease cost 60 34 95   68
Variable lease cost 298 287 596   552
Total lease cost 2,602 2,218 5,039   4,402
Operating cash flows from operating leases $ 2,418 2,200 $ 8,048   4,182
Right-of-use assets obtained in exchange for new operating lease liabilities   $ 27     $ 50