Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement of Comprehensive Income [Abstract]
LendingClub net income (loss)	$ (153,835)	$ (145,969)	$ (4,995)
Other comprehensive income (loss), before tax:
Net unrealized gain (loss) on securities available for sale	184	1,515	(1,671)
Other comprehensive income (loss), before tax	184	1,515	(1,671)
Income tax effect	(591)	611	0
Other comprehensive income (loss), net of tax	775	904	(1,671)
Less: Other comprehensive income attributable to noncontrolling interests	13	0	0
Other comprehensive income (loss), net of tax	762	904	(1,671)
LendingClub comprehensive income (loss)	(153,073)	(145,065)	(6,666)
Comprehensive income (loss) attributable to noncontrolling interests	13	0	0
Total comprehensive income (loss)	$ (153,060)	$ (145,065)	$ (6,666)