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Loans Held For Investment, Loans Held For Sale, Notes, Certificates and Secured Borrowings and Loan Servicing Rights - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Loans, Notes and Certificates, and Loan Servicing Rights [Line Items]      
Net interest income [1] $ (1,538) $ 972  
Loan commitment purchases $ 793,200    
Nonaccrual policy 90 days    
Loans and Loans Held for Sale      
Loans, Notes and Certificates, and Loan Servicing Rights [Line Items]      
Nonaccrual policy 90 days   120 days
Loan Servicing Rights      
Loans, Notes and Certificates, and Loan Servicing Rights [Line Items]      
Principal balance of underlying loan servicing rights $ 8,600,000   $ 8,200,000
Loans Invested in by Company      
Loans, Notes and Certificates, and Loan Servicing Rights [Line Items]      
Net change in fair value recorded in earnings on loans invested in by the Company (28,477) (1,417)  
Outstanding Principal Balance, Sales (742,732) (4,229)  
Outstanding Principal Balance, Principal payments and retirements (62,612) $ (2,664)  
Natural Disasters and Other Casualty Events | Loans Invested in by Company      
Loans, Notes and Certificates, and Loan Servicing Rights [Line Items]      
Loans and loans held for sale 12,100   14,000
Fair Value, Measurements, Recurring | Loans Invested in by Company      
Loans, Notes and Certificates, and Loan Servicing Rights [Line Items]      
Net interest income 25,200    
Aggregate principal balance outstanding 598,092   613,652
Loans and loans held for sale 565,802   597,055
Fair Value, Measurements, Recurring | Loans Invested in by Company | Loans Held For Sale      
Loans, Notes and Certificates, and Loan Servicing Rights [Line Items]      
Aggregate principal balance outstanding 258,477   242,273
Whole Loan Investors | Loans Invested in by Company      
Loans, Notes and Certificates, and Loan Servicing Rights [Line Items]      
Outstanding Principal Balance, Principal payments and retirements (551,100)    
Secured Borrowings | Loans Held for Investment      
Loans, Notes and Certificates, and Loan Servicing Rights [Line Items]      
Loans pledged as collateral 187,000   242,700
Fair value of loans pledged as collateral 175,400   228,100
Payables to Securitization Holders | Loans Held for Investment      
Loans, Notes and Certificates, and Loan Servicing Rights [Line Items]      
Loans pledged as collateral 328,200   359,400
Revolving Credit Facility | LendingClub Warehouse LLC | Warehouse Credit Facilities I and II [Member] | Loans Held For Sale      
Loans, Notes and Certificates, and Loan Servicing Rights [Line Items]      
Loans pledged as collateral 89,500   $ 62,100
Personal whole loans | Loans Invested in by Company      
Loans, Notes and Certificates, and Loan Servicing Rights [Line Items]      
Securities issued in securitization transaction, aggregate value $ 191,600    
[1] Prior period amounts have been reclassified to conform to the current period presentation. See “Notes to Condensed Consolidated Financial Statements – Note 1. Basis of Presentation” for additional information.