Leases - Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Leases [Abstract]
Leased assets obtained or adjusted in exchange for new, amended, and modified operating lease liabilities	$ 0	$ 0	$ (4,664)	$ 0

Right Of Use Asset Obtained or Adjusted In Exchange for New, Amended and Modified Operating Lease Liability

No definition available.

Name:	lc_RightOfUseAssetObtainedOrAdjustedInExchangeForNewAmendedAndModifiedOperatingLeaseLiability
Namespace Prefix:	lc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration