Regulatory Requirements - Summary of Regulatory Capital and Ratios (Details)	Sep. 30, 2021 USD ($)
LendingClub Bank
Amount
CET1 capital	$ 453,500,000
Tier 1 capital	453,500,000
Total capital	485,400,000
Tier 1 leverage	453,500,000
Risk-weighted assets	2,514,000,000
Quarterly adjusted average assets	$ 3,223,900,000
Ratio
CET1 capital	0.180
Tier 1 capital	0.180
Total capital	0.193
Tier 1 leverage	0.141
Minimum to be Well Capitalized, Ratio [Abstract]
CET1 capital	0.070
Tier 1 capital	0.085
Total capital	0.105
Tier 1 leverage	0.040
LendingClub
Amount
CET1 capital	$ 656,200,000
Tier 1 capital	656,200,000
Total capital	708,200,000
Tier 1 leverage	656,200,000
Risk-weighted assets	2,881,100,000
Quarterly adjusted average assets	$ 4,049,800,000
Ratio
CET1 capital	0.228
Tier 1 capital	0.228
Total capital	0.246
Tier 1 leverage	0.162
Minimum to be Well Capitalized, Ratio [Abstract]
CET1 capital	0.070
Tier 1 capital	0.085
Total capital	0.105
Tier 1 leverage	0.040