Leases - Balance Sheet Disclosures and Components of Lease Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Leases [Abstract]
Operating lease ROU assets	$ 50,743	$ 41,254
Operating lease liabilities	59,100	49,367
Operating lease cost	7,725	7,575
Short-term lease cost	139	136
Variable lease cost	1,128	1,020
Total lease cost	8,992	8,731
Operating cash flows from operating leases	8,316	8,051
Right-of-use assets obtained in exchange for new operating lease liabilities	5,484	$ 1,576
Right-of-use assets obtained in acquisition	$ 9,993
Weighted-average remaining lease term-operating leases (Year)	8 years 3 months 18 days	7 years 6 months
Weighted average discount rate-operating leases	3.20%	3.80%
Operating leases, rent expense			$ 6,100