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Debt (Detail)
3 Months Ended 12 Months Ended
Dec. 06, 2017
USD ($)
Oct. 13, 2017
USD ($)
Oct. 11, 2017
USD ($)
Oct. 10, 2017
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Jun. 30, 2018
Dec. 17, 2015
USD ($)
Debt Instrument [Line Items]                    
Warehouse notes payable (1) [1]         $ 32,100,000 $ 32,100,000 $ 0      
Repayment of credit facility           $ 251,000,000 0 $ 0    
Revolving Credit Facility                    
Debt Instrument [Line Items]                    
Current borrowing capacity                   $ 120,000,000.0
Maximum rolling annual total net leverage ratio allowed         4.00 4.00        
Proceeds from credit facility     $ 5,000,000              
Repayment of credit facility   $ 5,000,000                
Debt issuance costs               1,300,000    
Revolving Credit Facility | Minimum                    
Debt Instrument [Line Items]                    
Commitment fee           0.25%        
Revolving Credit Facility | Maximum                    
Debt Instrument [Line Items]                    
Commitment fee           0.375%        
Revolving Credit Facility | Scenario, Forecast                    
Debt Instrument [Line Items]                    
Maximum rolling annual total net leverage ratio allowed                 3.00  
Revolving Credit Facility | London Interbank Offered Rate (LIBOR) | Minimum                    
Debt Instrument [Line Items]                    
Basis spread           1.75%        
Revolving Credit Facility | London Interbank Offered Rate (LIBOR) | Maximum                    
Debt Instrument [Line Items]                    
Basis spread           2.00%        
Warehouse Credit Facility | LendingClub Warehouse LLC | Revolving Credit Facility                    
Debt Instrument [Line Items]                    
Current borrowing capacity       $ 250,000,000            
Commitment fee       0.75%            
Monthly unused commitment fee (percent)           0.50%        
Maximum rolling annual total net leverage ratio allowed       3.25            
Proceeds from credit facility         $ 246,000,000          
Warehouse notes payable (1)         32,100,000 $ 32,100,000        
Restricted cash pledged as collateral         4,100,000 $ 4,100,000        
Capitalized debt issuance costs       $ 2,400,000.0            
Warehouse Credit Facility | LendingClub Warehouse LLC | Revolving Credit Facility | Scenario, Forecast                    
Debt Instrument [Line Items]                    
Maximum rolling annual total net leverage ratio allowed                 3.0  
Warehouse Credit Facility | LendingClub Warehouse LLC | Revolving Credit Facility | London Interbank Offered Rate (LIBOR) | Minimum                    
Debt Instrument [Line Items]                    
Basis spread           2.00%        
Warehouse Credit Facility | LendingClub Warehouse LLC | Revolving Credit Facility | London Interbank Offered Rate (LIBOR) | Maximum                    
Debt Instrument [Line Items]                    
Basis spread           7.25%        
Payables to Securitization Holders                    
Debt Instrument [Line Items]                    
Restricted cash pledged as collateral             18,700,000      
Loans Held For Sale | Warehouse Credit Facility | LendingClub Warehouse LLC | Revolving Credit Facility                    
Debt Instrument [Line Items]                    
Loans pledged as collateral         62,100,000 $ 62,100,000        
Loans Held for Investment | Payables to Securitization Holders                    
Debt Instrument [Line Items]                    
Loans pledged as collateral         359,400,000 359,400,000        
Personal Whole Loan Securitizations                    
Debt Instrument [Line Items]                    
Outstanding principal balance $ 368,000,000       999,128,000 999,128,000 $ 0 $ 0    
Depositor | Personal Whole Loan Securitizations                    
Debt Instrument [Line Items]                    
Notes sold to third-party investors $ 310,500,000                  
Depositor | Residual Certificates                    
Debt Instrument [Line Items]                    
Percentage of available for sale securities sold under securitization (percent) 4.10%                  
Depositor | Notes                    
Debt Instrument [Line Items]                    
Percentage of available for sale securities sold under securitization (percent) 95.00%                  
Payable to Securitization Note and Residual Certificate Holders | Personal Whole Loan Securitizations                    
Debt Instrument [Line Items]                    
Debt issuance costs         2,900,000 2,900,000        
Notes and residual certificates held by third-party investors         $ 312,100,000 $ 312,100,000        
[1] Includes amounts in consolidated variable interest entities (VIEs) presented separately in the table below.