Regulatory Requirements - Summary of Regulatory Capital and Ratios (Details) $ in Millions	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Parent
Amount
CET1 capital	$ 1,090.2	$ 1,005.8
Tier 1 capital	1,090.2	1,005.8
Total capital	1,169.2	1,088.1
Tier 1 leverage	1,090.2	1,005.8
Risk-weighted assets	6,104.5	6,360.7
Quarterly adjusted average assets	$ 8,476.1	$ 7,119.0
Ratio
CET1 capital	0.179	0.158
Tier 1 capital	0.179	0.158
Total capital	0.192	0.171
Tier 1 leverage	0.129	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	$ 949.4	$ 852.2
Tier 1 capital	949.4	852.2
Total capital	1,027.4	932.4
Tier 1 leverage	949.4	852.2
Risk-weighted assets	6,022.2	6,194.0
Quarterly adjusted average assets	$ 8,337.4	$ 6,795.2
Ratio
CET1 capital	0.158	0.138
Tier 1 capital	0.158	0.138
Total capital	0.171	0.151
Tier 1 leverage	0.114	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

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 505
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (c)(1)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480696/942-505-50-1

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