Variable Interest Entities - Nonconsolidated VIEs (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Variable Interest Entity [Line Items]
Securitization investments	$ 288,717	$ 374,688
Variable interest entity, not primary beneficiary
Variable Interest Entity [Line Items]
Securitization investments	288,717	374,688
Variable interest entity, not primary beneficiary \| Personal loans
Variable Interest Entity [Line Items]
Securitization investments	42,238	62,925
Variable interest entity, not primary beneficiary \| Student loans
Variable Interest Entity [Line Items]
Securitization investments	$ 246,479	$ 311,763

The carrying amount (fair value) as of the balance sheet date of the transferor's interests in transferred financial assets (typically securitized receivables, generally not involved in the collection of principal) following transfer of significant portions of such financial instruments to other parties. Such interests could be ancillary cash flows and interest-only strips.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (a)(3)
-URI https://asc.fasb.org/extlink&oid=121570589&loc=d3e107314-111719

Name:	us-gaap_InterestsContinuedToBeHeldByTransferorFairValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant