Leases - Additional information (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Lessee, Lease, Description [Line Items]
Operating lease costs		$ 7,821	$ 7,244	$ 15,812	$ 14,860
Cash payments included in the measurement of lease liabilities reported in operating cash flows		5,844	7,685	14,305	14,585
Right-of-use assets obtained in exchange for new lease liabilities		435	$ 4,420	3,885	$ 4,420
Lease liability		$ 139,772		$ 139,772
Weighted average discount rate		3.90%	3.90%	3.90%	3.90%
Weighted average remaining lease term in years		6 years 1 month 6 days	6 years 6 months	6 years 1 month 6 days	6 years 6 months
Maximum
Lessee, Lease, Description [Line Items]
Operating lease term		11 years		11 years
Other assets
Lessee, Lease, Description [Line Items]
Right-of-use assets	[1]	$ 119,494	$ 134,061	$ 119,494	$ 134,061
Other liabilities
Lessee, Lease, Description [Line Items]
Lease liability	[1]	$ 139,772	$ 150,341	$ 139,772	$ 150,341

[1] The right-of-use assets are included in ‘other assets’ while the operating lease liability is included in ‘other liabilities.’