Securitizations and Variable Interest Entities - Summary of Financial Asset and Liability Involvement with Consolidated VIEs (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Variable Interest Entity [Line Items]
Assets	$ 4,370,101	$ 1,863,293
Liabilities	(3,607,742)	(1,139,122)
Consolidated VIEs
Variable Interest Entity [Line Items]
Assets	144,426	218,165
Liabilities	(135,067)	(206,157)
Net Assets	9,359	12,008
LC Trust | Consolidated VIEs
Variable Interest Entity [Line Items]
Assets	26,424	55,447
Liabilities	(23,991)	(53,068)
Net Assets	2,433	2,379
Consolidated trusts | Consolidated VIEs
Variable Interest Entity [Line Items]
Assets	118,002	162,460
Liabilities	(111,076)	(153,089)
Net Assets	$ 6,926	9,371
Warehouse credit facility | Consolidated VIEs
Variable Interest Entity [Line Items]
Assets		258
Liabilities		0
Net Assets		$ 258