Condensed Consolidated Statements of Changes in Equity (Parenthetical) $ in Millions	9 Months Ended
Sep. 30, 2020 USD ($)
Statement of Stockholders' Equity [Abstract]
Payment of deemed dividend due to beneficial conversion feature	$ 50.2

Payment of Deemed Dividend due to Beneficial Conversion Feature

No definition available.

Name:	lc_PaymentofDeemedDividendduetoBeneficialConversionFeature
Namespace Prefix:	lc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration