Regulatory Requirements - Summary of Regulatory Capital and Ratios (Details) $ in Millions	Sep. 30, 2022 USD ($)	Dec. 31, 2021 USD ($)
LendingClub Bank
Amount
CET1 capital	$ 760.4	$ 523.7
Tier 1 capital	760.4	523.7
Total capital	825.8	563.7
Tier 1 leverage	760.4	523.7
Risk-weighted assets	5,018.3	3,130.4
Quarterly adjusted average assets	$ 5,692.0	$ 3,667.7
Ratio
CET1 capital	0.152	0.167
Tier 1 capital	0.152	0.167
Total capital	0.165	0.180
Tier 1 leverage	0.134	0.143
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	$ 953.2	$ 710.0
Tier 1 capital	953.2	710.0
Total capital	1,033.2	767.9
Tier 1 leverage	953.2	710.0
Risk-weighted assets	5,210.2	3,333.2
Quarterly adjusted average assets	$ 6,061.4	$ 4,301.7
Ratio
CET1 capital	0.183	0.213
Tier 1 capital	0.183	0.213
Total capital	0.198	0.230
Tier 1 leverage	0.157	0.165
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