Leases - Supplemental Balance Sheet Information (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Lessee, Lease, Description [Line Items]
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Other Assets	Other Assets
Operating lease assets	$ 82,612	$ 0
Operating Lease, Liability, Statement of Financial Position [Extensible Enumeration]	Other liabilities	Other liabilities
Operating lease liabilities	$ 99,492	$ 0
LendingClub Historical Presentation
Lessee, Lease, Description [Line Items]
Operating lease assets		74,037
Operating lease liabilities		$ 94,538