Quarterly Results of Operations (Unaudited) (Details) - USD ($)	3 Months Ended								9 Months Ended	12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2018	Dec. 31, 2019		Dec. 31, 2018		Dec. 31, 2017
Net revenue, fees										$ 604,234,000		$ 530,587,000
Interest income	$ 74,791,000	$ 77,820,000	$ 92,562,000	$ 100,172,000	$ 106,170,000	$ 115,514,000	$ 127,760,000	$ 138,018,000		345,345,000		487,462,000		$ 611,259,000
Interest expense	(49,251,000)	(55,060,000)	(66,916,000)	(75,360,000)	(83,222,000)	(90,642,000)	(100,898,000)	(110,843,000)		(246,587,000)		(385,605,000)		(571,424,000)
Net fair value adjustments	(42,659,000)	(31,628,000)	(35,974,000)	(34,729,000)	(25,865,000)	(19,554,000)	(26,556,000)	(28,713,000)		(144,990,000)		(100,688,000)		(30,817,000)
Net interest income and fair value adjustments	(17,119,000)	(8,868,000)	(10,328,000)	(9,917,000)	(2,917,000)	5,318,000	306,000	(1,538,000)		(46,232,000)		1,169,000		9,018,000
Gain on sales of loans	20,373,000	18,305,000	13,886,000	15,152,000	10,509,000	10,919,000	11,880,000	12,671,000		67,716,000		45,979,000		23,370,000
Net Investor Revenue	33,512,000	39,708,000	35,830,000	36,966,000	38,011,000	45,406,000	39,586,000	39,028,000		146,016,000	[1]	162,031,000	[1]	119,496,000	[1]
Other revenue	5,023,000	3,983,000	2,770,000	2,055,000	1,457,000	1,458,000	1,467,000	1,457,000		13,831,000		5,839,000		6,436,000
Total net revenue	188,486,000	204,896,000	190,807,000	174,418,000	181,521,000	184,645,000	176,979,000	151,667,000		758,607,000		694,812,000		574,540,000
Sales and marketing	67,222,000	76,255,000	69,323,000	66,623,000	68,353,000	73,601,000	69,046,000	57,517,000		279,423,000		268,517,000		229,865,000
Origination and servicing	22,203,000	27,996,000	24,931,000	28,273,000	25,707,000	25,431,000	25,593,000	22,645,000		103,403,000		99,376,000		86,891,000
Engineering and product development	41,080,000	41,455,000	43,299,000	42,546,000	39,552,000	41,216,000	37,650,000	36,837,000		168,380,000		155,255,000		142,264,000
Other general and administrative	57,607,000	59,485,000	64,324,000	56,876,000	61,303,000	57,446,000	57,583,000	52,309,000		238,292,000		228,641,000		191,683,000
Goodwill impairment					0	0	35,633,000	0		0		35,633,000		0
Class action and regulatory litigation expense					0	9,738,000	12,262,000	13,500,000	$ 35,500,000	0		35,500,000		77,250,000
Total operating expenses	188,112,000	205,191,000	201,877,000	194,318,000	194,915,000	207,432,000	237,767,000	182,808,000		789,498,000		822,922,000		727,953,000
Loss before income tax expense	374,000	(295,000)	(11,070,000)	(19,900,000)	(13,394,000)	(22,787,000)	(60,788,000)	(31,141,000)		(30,891,000)		(128,110,000)		(153,413,000)
Income tax expense (benefit)	140,000	97,000	(438,000)	0	18,000	(38,000)	24,000	39,000		(201,000)		43,000		632,000
Consolidated net loss	234,000	(392,000)	(10,632,000)	(19,900,000)	(13,412,000)	(22,749,000)	(60,812,000)	(31,180,000)		(30,690,000)		(128,153,000)		(154,045,000)
Less: Income (Loss) attributable to noncontrolling interests	0	(9,000)	29,000	35,000	50,000	55,000	49,000	1,000		55,000		155,000		(210,000)
LendingClub net loss	234,000	(383,000)	(10,661,000)	(19,935,000)	(13,462,000)	(22,804,000)	(60,861,000)	(31,181,000)		$ (30,745,000)		$ (128,308,000)		$ (153,835,000)
Other data:
Loan originations	$ 3,083,129,000	$ 3,349,613,000	$ 3,129,520,000	$ 2,727,831,000	$ 2,871,019,000	$ 2,886,462,000	$ 2,818,331,000	$ 2,306,003,000
Weighted-average common shares - Basic (shares)	88,371,672	87,588,495	86,719,049	86,108,871	85,539,436	84,871,828	84,238,897	83,659,860		87,278,596	[2]	84,583,461	[2]	81,799,189	[2]
Weighted-average common shares - Diluted (shares)	88,912,677	87,588,495	86,719,049	86,108,871	85,539,436	84,871,828	84,238,897	83,659,860		87,278,596	[2]	84,583,461	[2]	81,799,189	[2]
Net income (loss) per share attributable to LendingClub: (3)
Basic ($ per share)	$ 0.00	$ 0.00	$ (0.12)	$ (0.23)	$ (0.16)	$ (0.27)	$ (0.72)	$ (0.37)		$ (0.35)	[2]	$ (1.52)	[2]	$ (1.88)	[2]
Diluted ($ per share)	$ 0.00	$ 0.00	$ (0.12)	$ (0.23)	$ (0.16)	$ (0.27)	$ (0.72)	$ (0.37)		$ (0.35)	[2]	$ (1.52)	[2]	$ (1.88)	[2]
Transaction fees
Net revenue, fees	$ 149,951,000	$ 161,205,000	$ 152,207,000	$ 135,397,000	$ 142,053,000	$ 137,781,000	$ 135,926,000	$ 111,182,000		$ 598,760,000		$ 526,942,000		$ 448,608,000
Investor fees
Net revenue, fees	$ 30,258,000	$ 30,271,000	$ 32,272,000	$ 31,731,000	$ 30,419,000	$ 29,169,000	$ 27,400,000	$ 27,895,000		$ 124,532,000		$ 114,883,000		$ 87,108,000

[1] See “Notes to Consolidated Financial Statements – Note 1. Basis of Presentation” for additional information.

[2] All share and per share information has been retroactively adjusted to reflect a reverse stock split. See “Notes to Consolidated Financial Statements – Note 4. Net Loss Per Share” for additional information.