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Leases - Lease Costs and Other Information (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Leases [Abstract]      
Operating lease cost (cost resulting from lease payments) $ 2,159 $ 1,998  
Variable lease cost (cost excluded from lease payments) 250 267  
Sublease income (87) (87)  
Net lease cost 2,322 2,178  
Operating lease - operating cash flows (fixed payments) 2,304 2,206  
Right-of-use assets - operating leases $ 30,707 $ 25,655 $ 25,237
Weighted average lease term - operating leases 6 years 2 months 26 days 4 years 10 months 2 days  
Weighted average discount rate - operating leases 3.37% 4.00%