Regulatory Requirements - Summary of Regulatory Capital and Ratios (Details) $ in Millions	Jun. 30, 2023 USD ($)	Dec. 31, 2022 USD ($)
LendingClub
Amount
CET1 capital	$ 1,053.5	$ 1,005.8
Tier 1 capital	1,053.5	1,005.8
Total capital	1,138.3	1,088.1
Tier 1 leverage	1,053.5	1,005.8
Risk-weighted assets	6,526.5	6,360.7
Quarterly adjusted average assets	$ 8,522.6	$ 7,119.0
Ratio
CET1 capital	0.161	0.158
Tier 1 capital	0.161	0.158
Total capital	0.174	0.171
Tier 1 leverage	0.124	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 Bank
Amount
CET1 capital	$ 939.3	$ 852.2
Tier 1 capital	939.3	852.2
Total capital	1,022.6	932.4
Tier 1 leverage	939.3	852.2
Risk-weighted assets	6,406.5	6,194.0
Quarterly adjusted average assets	$ 8,300.0	$ 6,795.2
Ratio
CET1 capital	0.147	0.138
Tier 1 capital	0.147	0.138
Total capital	0.160	0.151
Tier 1 leverage	0.113	0.125
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