Segment Reporting - Balance Sheets (Details) - USD ($) $ in Thousands		Sep. 30, 2021	Jun. 30, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Dec. 31, 2019
Assets
Total cash and cash equivalents		$ 862,151		$ 524,963
Restricted cash	[1]	77,577		103,522
Securities available for sale at fair value		274,930		142,226
Loans held for sale at fair value	[1]	152,160		121,902
Loans and leases held for investment, net		2,603,256		0
Retail and certificate loans held for investment at fair value	[1]	298,541		636,686
Other loans held for investment at fair value	[1]	27,229		49,954
Property, equipment and software, net		96,073		96,641
Investment in subsidiary		0		0
Goodwill		75,717		0
Other assets	[1]	283,126		187,399
Total assets		4,750,760		1,863,293
Liabilities and Equity
Total deposits		2,838,719		0
Short-term borrowings		46,110		104,989
Advances from Paycheck Protection Program Liquidity Facility (PPPLF)		391,945		0
Retail notes, certificates and secured borrowings at fair value	[1]	298,541		636,774
Payable on Structured Program borrowings	[1]	89,252		152,808
Other long-term debt		15,563		0
Other liabilities	[1]	265,840		244,551
Liabilities		3,945,970		1,139,122
Total equity		804,790	$ 762,359	724,171	$ 733,892	$ 746,142	$ 900,187
Total liabilities and equity		4,750,760		1,863,293
Operating Segments | LendingClub Bank
Assets
Total cash and cash equivalents		825,538		0
Restricted cash		0		0
Securities available for sale at fair value		201,438		0
Loans held for sale at fair value		82,483		0
Loans and leases held for investment, net		2,603,256		0
Retail and certificate loans held for investment at fair value		0		0
Other loans held for investment at fair value		0		0
Property, equipment and software, net		26,457		0
Investment in subsidiary		0		0
Goodwill		75,717		0
Other assets		199,050		0
Total assets		4,013,939		0
Liabilities and Equity
Total deposits		2,910,171		0
Short-term borrowings		321		0
Advances from Paycheck Protection Program Liquidity Facility (PPPLF)		391,945		0
Retail notes, certificates and secured borrowings at fair value		0		0
Payable on Structured Program borrowings		0		0
Other long-term debt		0		0
Other liabilities		154,521		0
Liabilities		3,456,958		0
Total equity		556,981		0
Total liabilities and equity		4,013,939		0
Operating Segments | LendingClub Corporation
Assets
Total cash and cash equivalents		100,815		524,963
Restricted cash		84,827		103,522
Securities available for sale at fair value		73,492		142,226
Loans held for sale at fair value		69,677		121,902
Loans and leases held for investment, net		0		0
Retail and certificate loans held for investment at fair value		298,541		636,686
Other loans held for investment at fair value		27,229		49,954
Property, equipment and software, net		69,616		96,641
Investment in subsidiary		511,394		0
Goodwill		0		0
Other assets		176,994		187,399
Total assets		1,412,585		1,863,293
Liabilities and Equity
Total deposits		0		0
Short-term borrowings		45,789		104,989
Advances from Paycheck Protection Program Liquidity Facility (PPPLF)		0		0
Retail notes, certificates and secured borrowings at fair value		298,541		636,774
Payable on Structured Program borrowings		89,252		152,808
Other long-term debt		15,563		0
Other liabilities		171,764		244,551
Liabilities		620,909		1,139,122
Total equity		791,676		724,171
Total liabilities and equity		1,412,585		1,863,293
Intercompany Eliminations
Assets
Total cash and cash equivalents		(64,202)		0
Restricted cash		(7,250)		0
Securities available for sale at fair value		0		0
Loans held for sale at fair value		0		0
Loans and leases held for investment, net		0		0
Retail and certificate loans held for investment at fair value		0		0
Other loans held for investment at fair value		0		0
Property, equipment and software, net		0		0
Investment in subsidiary		(511,394)		0
Goodwill		0		0
Other assets		(92,918)		0
Total assets		(675,764)		0
Liabilities and Equity
Total deposits		(71,452)		0
Short-term borrowings		0		0
Advances from Paycheck Protection Program Liquidity Facility (PPPLF)		0		0
Retail notes, certificates and secured borrowings at fair value		0		0
Payable on Structured Program borrowings		0		0
Other long-term debt		0		0
Other liabilities		(60,445)		0
Liabilities		(131,897)		0
Total equity		(543,867)		0
Total liabilities and equity		$ (675,764)		$ 0

[1] Includes amounts in consolidated variable interest entities (VIEs) presented separately in the table below.