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Debt (Details) - USD ($)
6 Months Ended
Jun. 30, 2018
Jun. 29, 2018
Dec. 31, 2017
Dec. 17, 2015
Debt Instrument [Line Items]        
Debt outstanding under credit facility [1] $ 349,232,000   $ 32,100,000  
Revolving Credit Facility        
Debt Instrument [Line Items]        
Maximum borrowing capacity       $ 120,000,000
Debt outstanding under credit facility $ 100,000,000   0  
Minimum | Revolving Credit Facility        
Debt Instrument [Line Items]        
Unused commitment fee (percent) 0.25%      
Minimum | Revolving Credit Facility | London Interbank Offered Rate (LIBOR)        
Debt Instrument [Line Items]        
Borrowings interest rate spread (percent) 1.75%      
Maximum | Revolving Credit Facility        
Debt Instrument [Line Items]        
Unused commitment fee (percent) 0.375%      
Maximum | Revolving Credit Facility | London Interbank Offered Rate (LIBOR)        
Debt Instrument [Line Items]        
Borrowings interest rate spread (percent) 2.00%      
Warehouse Credit Facility I | LendingClub Warehouse I LLC | Revolving Credit Facility        
Debt Instrument [Line Items]        
Maximum borrowing capacity $ 250,000,000      
Warehouse Credit Facility II | LendingClub Warehouse II LLC | Revolving Credit Facility        
Debt Instrument [Line Items]        
Maximum borrowing capacity $ 200,000,000.0      
Warehouse Credit Facility III | LendingClub Warehouse III LLC | Revolving Credit Facility        
Debt Instrument [Line Items]        
Maximum borrowing capacity   $ 29,600,000.0    
Warehouse Credit Facilities | Minimum | Revolving Credit Facility | London Interbank Offered Rate (LIBOR)        
Debt Instrument [Line Items]        
Borrowings interest rate spread (percent) 1.85%      
Warehouse Credit Facilities | Maximum | Revolving Credit Facility | London Interbank Offered Rate (LIBOR)        
Debt Instrument [Line Items]        
Borrowings interest rate spread (percent) 2.75%      
Warehouse Credit Facilities I and II | Revolving Credit Facility        
Debt Instrument [Line Items]        
Debt outstanding under credit facility $ 249,200,000   32,100,000  
Restricted cash $ 26,300,000   4,100,000  
Warehouse Credit Facilities I and II | Minimum | Revolving Credit Facility        
Debt Instrument [Line Items]        
Unused commitment fee (percent) 0.50%      
Warehouse Credit Facilities I and II | Maximum | Revolving Credit Facility        
Debt Instrument [Line Items]        
Unused commitment fee (percent) 1.25%      
Loans Held For Sale | Warehouse Credit Facilities I and II | Revolving Credit Facility        
Debt Instrument [Line Items]        
Loans pledged as collateral $ 403,300,000   $ 62,100,000  
[1] Includes amounts in consolidated variable interest entities (VIEs) presented separately in the table below.