Regulatory Requirements - Summary of Regulatory Capital and Ratios (Details)	Jun. 30, 2021 USD ($)
LendingClub
Amount
CET1 capital	$ 610,100,000
Tier 1 capital	610,100,000
Total capital	658,500,000
Tier 1 leverage	610,100,000
Risk-weighted assets	2,623,100,000
Quarterly adjusted average assets	$ 4,009,100,000
Ratio
CET1 capital	0.233
Tier 1 capital	0.233
Total capital	0.251
Tier 1 leverage	0.152
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 Bank
Amount
CET1 capital	$ 396,500,000
Tier 1 capital	396,500,000
Total capital	423,200,000
Tier 1 leverage	396,500,000
Risk-weighted assets	2,123,000,000.0
Quarterly adjusted average assets	$ 2,941,200,000
Ratio
CET1 capital	0.187
Tier 1 capital	0.187
Total capital	0.199
Tier 1 leverage	0.135
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