Condensed Consolidated Statements of Operations - USD ($)		3 Months Ended				6 Months Ended
		Jun. 30, 2018		Jun. 30, 2017		Jun. 30, 2018	Jun. 30, 2017
Income Statement [Abstract]
Transaction fees		$ 135,926,000		$ 107,314,000		$ 247,108,000	$ 206,006,000
Investor fees		27,400,000		21,116,000		55,295,000	42,296,000
Gain on sales of loans (1)	[1]	11,880,000		4,445,000		24,551,000	6,337,000
Other revenue (1)		1,467,000	[1]	1,949,000	[1]	2,924,000	3,695,000
Net interest income and fair value adjustments:
Interest income		127,760,000		157,260,000		265,778,000	318,256,000
Interest expense		(100,898,000)		(150,340,000)		(211,741,000)	(308,947,000)
Net fair value adjustments (1)	[1]	(26,556,000)		(2,171,000)		(55,269,000)	(3,588,000)
Net interest income and fair value adjustments (1)		306,000	[1]	4,749,000	[1]	(1,232,000)	5,721,000
Total net revenue		176,979,000		139,573,000		328,646,000	264,055,000
Operating expenses:
Sales and marketing		69,046,000		55,582,000		126,563,000	110,165,000
Origination and servicing		25,593,000		21,274,000		48,238,000	41,723,000
Engineering and product development		37,650,000		35,718,000		74,487,000	71,478,000
Other general and administrative		57,583,000		52,495,000		109,892,000	96,069,000
Goodwill impairment		35,633,000		0		35,633,000	0
Class action settlement and regulatory litigation expense		12,262,000		0		25,762,000	0
Total operating expenses		237,767,000		165,069,000		420,575,000	319,435,000
Loss before income tax expense		(60,788,000)		(25,496,000)		(91,929,000)	(55,380,000)
Income tax expense (benefit)		24,000		(52,000)		63,000	(92,000)
Consolidated net loss		(60,812,000)		(25,444,000)		(91,992,000)	(55,288,000)
Less: Income attributable to noncontrolling interests		49,000		10,000		50,000	10,000
LendingClub net loss		$ (60,861,000)		$ (25,454,000)		$ (92,042,000)	$ (55,298,000)
Net loss per share attributable to LendingClub: Basic ($ per share)		$ (0.14)		$ (0.06)		$ (0.22)	$ (0.14)
Net loss per share attributable to LendingClub: Diluted ($ per share)		$ (0.14)		$ (0.06)		$ (0.22)	$ (0.14)
Weighted-average common shares - Diluted (shares)		421,194,489		406,676,996		419,754,893	403,510,351
Weighted-average common shares - Basic (shares)		421,194,489		406,676,996		419,754,893	403,510,351

[1] Prior period amounts have been reclassified to conform to the current period presentation. See “Notes to Condensed Consolidated Financial Statements – Note 1. Basis of Presentation” for additional information.