Segment Reporting - Balance Sheets (Details) - USD ($) $ in Thousands		Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019
Assets
Total cash and cash equivalents		$ 568,646		$ 524,963
Restricted cash	[1]	123,896		103,522
Securities available for sale at fair value		277,505		142,226
Loans held for sale	[1]	226,328		121,902
Loans and leases held for investment, net		2,299,045		0
Retail and certificate loans held for investment at fair value	[1]	391,362		636,686
Other loans held for investment at fair value	[1]	34,523		49,954
Property, equipment and software, net		94,676		96,641
Investment in subsidiary		0		0
Goodwill		75,717		0
Other Assets	[1]	278,403		187,399
Total assets		4,370,101		1,863,293
Liabilities and Equity
Total deposits		2,539,704		0
Short-term borrowings		68,781		104,989
Advances from Paycheck Protection Program Liquidity Facility (PPPLF)		195,481		0
Retail notes, certificates and secured borrowings at fair value	[1]	391,384		636,774
Payable on Structured Program borrowings	[1]	110,871		152,808
Other long-term debt		15,650		0
Other liabilities	[1]	285,871		244,551
Liabilities		3,607,742		1,139,122
Total equity		762,359	$ 733,135	724,171	$ 746,142	$ 796,546	$ 900,187
Total liabilities and equity		4,370,101		1,863,293
Operating Segments | LendingClub Corporation
Assets
Total cash and cash equivalents		72,458		524,963
Restricted cash		127,781		103,522
Securities available for sale at fair value		95,378		142,226
Loans held for sale		92,509		121,902
Loans and leases held for investment, net		0		0
Retail and certificate loans held for investment at fair value		391,362		636,686
Other loans held for investment at fair value		34,523		49,954
Property, equipment and software, net		78,288		96,641
Investment in subsidiary		483,696		0
Goodwill		0		0
Other Assets		189,567		187,399
Total assets		1,565,562		1,863,293
Liabilities and Equity
Total deposits		0		0
Short-term borrowings		68,460		104,989
Advances from Paycheck Protection Program Liquidity Facility (PPPLF)		0		0
Retail notes, certificates and secured borrowings at fair value		391,384		636,774
Payable on Structured Program borrowings		110,871		152,808
Other long-term debt		15,650		0
Other liabilities		206,525		244,551
Liabilities		792,890		1,139,122
Total equity		772,672		724,171
Total liabilities and equity		1,565,562		1,863,293
Operating Segments | LendingClub Bank
Assets
Total cash and cash equivalents		493,915		0
Restricted cash		0		0
Securities available for sale at fair value		182,127		0
Loans held for sale		133,819		0
Loans and leases held for investment, net		2,299,045		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		16,388		0
Investment in subsidiary		0		0
Goodwill		75,717		0
Other Assets		156,886		0
Total assets		3,357,897		0
Liabilities and Equity
Total deposits		2,541,317		0
Short-term borrowings		321		0
Advances from Paycheck Protection Program Liquidity Facility (PPPLF)		195,481		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		125,790		0
Liabilities		2,862,909		0
Total equity		494,988		0
Total liabilities and equity		3,357,897		0
Intercompany Eliminations
Assets
Total cash and cash equivalents		2,273		0
Restricted cash		(3,885)		0
Securities available for sale at fair value		0		0
Loans held for sale		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		(483,696)		0
Goodwill		0		0
Other Assets		(68,050)		0
Total assets		(553,358)		0
Liabilities and Equity
Total deposits		(1,613)		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		(46,444)		0
Liabilities		(48,057)		0
Total equity		(505,301)		0
Total liabilities and equity		$ (553,358)		$ 0

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