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Leases - Balance Sheet Disclosures and Components of Lease Expense (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Leases [Abstract]      
Operating lease ROU assets $ 53,802   $ 50,743
Operating lease liabilities $ 58,080   $ 59,100
Weighted-average remaining lease term-operating leases (Year) 7 years 10 months 24 days   8 years 3 months 18 days
Weighted average discount rate-operating leases 3.20%   3.20%
Operating lease cost $ 2,104 $ 1,885  
Short-term lease cost 35 34  
Variable lease cost 298 264  
Total lease cost 2,437 2,183  
Operating cash flows from operating leases 5,630 1,982  
Right-of-use assets obtained in exchange for new operating lease liabilities $ 4,760 $ 23