Leases - Components of Total Lease Cost (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Amortization of ROU assets	$ 363	$ 291
Interest on lease liabilities	146	191
Operating lease cost	36,094	34,175
Short-term lease cost	783	410
Variable lease cost	4,296	3,573
Sublease income	(2,520)	(3,422)
Total lease cost (included in net occupancy and equipment expense)	$ 39,162	$ 35,218