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Debt - Schedule of Debt (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Debt Instrument [Line Items]      
Total Outstanding $ 2,929,065   $ 5,259,584
Less: unamortized debt issuance costs, premiums and discounts (37,748)   (26,168)
Total debt 2,891,317   5,233,416
Debt discounts issued 17,300    
Amount not available for general borrowing purposes to secure letter of credit 6,400   6,400
Asset Pledged as Collateral      
Debt Instrument [Line Items]      
Amount not available for general borrowing purposes to secure letter of credit 27,200   27,200
Personal Loan Securitizations      
Debt Instrument [Line Items]      
Total Collateral 384,246    
Total Outstanding 125,990   239,340
Student loan securitizations      
Debt Instrument [Line Items]      
Total Collateral 152,387    
Total Outstanding 130,413   182,744
Secured Debt | Asset Pledged as Collateral      
Debt Instrument [Line Items]      
Total Capacity 151,000    
Unsecured Debt      
Debt Instrument [Line Items]      
Total Capacity $ 50,000    
Minimum      
Debt Instrument [Line Items]      
Unused commitment fee percentage 0.00%    
Minimum | Personal Loan Securitizations      
Debt Instrument [Line Items]      
Stated Interest Rate 1.30%    
Minimum | Student loan securitizations      
Debt Instrument [Line Items]      
Stated Interest Rate 3.09%    
Maximum      
Debt Instrument [Line Items]      
Unused commitment fee percentage 0.65%    
Maximum | Personal Loan Securitizations      
Debt Instrument [Line Items]      
Stated Interest Rate 6.21%    
Maximum | Student loan securitizations      
Debt Instrument [Line Items]      
Stated Interest Rate 4.21%    
Personal loan warehouse facilities | Line of Credit      
Debt Instrument [Line Items]      
Total Collateral $ 354,851    
Total Capacity 4,625,000    
Total Outstanding $ 296,921   1,077,444
Personal loan warehouse facilities | Minimum | Line of Credit      
Debt Instrument [Line Items]      
Stated Interest Rate 5.47%    
Personal loan warehouse facilities | Maximum | Line of Credit      
Debt Instrument [Line Items]      
Stated Interest Rate 7.23%    
Student loan warehouse facilities | Line of Credit      
Debt Instrument [Line Items]      
Total Collateral $ 517,928    
Total Capacity 3,945,000    
Total Outstanding $ 455,328   2,095,046
Student loan warehouse facilities | Minimum | Line of Credit      
Debt Instrument [Line Items]      
Stated Interest Rate 6.09%    
Student loan warehouse facilities | Maximum | Line of Credit      
Debt Instrument [Line Items]      
Stated Interest Rate 7.48%    
Risk retention warehouse facilities | Line of Credit      
Debt Instrument [Line Items]      
Total Collateral $ 60,787    
Total Capacity 100,000    
Total Outstanding $ 59,941   67,038
Risk retention warehouse facilities | Minimum | Line of Credit      
Debt Instrument [Line Items]      
Stated Interest Rate 6.84%    
Risk retention warehouse facilities | Maximum | Line of Credit      
Debt Instrument [Line Items]      
Stated Interest Rate 8.69%    
Revolving credit facility | Line of Credit      
Debt Instrument [Line Items]      
Amount not available for general borrowing purposes to secure letter of credit $ 13,100    
Revolving credit facility | Revolving credit facility      
Debt Instrument [Line Items]      
Stated Interest Rate 6.93%    
Total Capacity $ 645,000    
Total Outstanding $ 486,000   486,000
Convertible senior notes due 2026 | Convertible Debt      
Debt Instrument [Line Items]      
Stated Interest Rate 0.00%    
Total Outstanding $ 511,972   1,111,972
Less: unamortized debt issuance costs, premiums and discounts (5,700)   (13,300)
Interest expense $ 1,200 $ 1,300  
Effective interest rate 0.92% 0.42%  
Net carrying amount $ 506,300   1,100,000
Convertible senior notes due 2029 | Convertible Debt      
Debt Instrument [Line Items]      
Stated Interest Rate 1.25%    
Total Outstanding $ 862,500   0
Less: unamortized debt issuance costs, premiums and discounts (21,500)    
Debt discounts issued 17,300    
Interest expense $ 1,000    
Effective interest rate 1.37%    
Net carrying amount $ 841,000    
Other financing | Other Financings      
Debt Instrument [Line Items]      
Total Collateral 169,929    
Total Capacity 201,032    
Total Outstanding 0   $ 0
Other financing | Other Financings | Loans at fair value      
Debt Instrument [Line Items]      
Total Collateral 54,300    
Other financing | Other Financings | Securities Investment      
Debt Instrument [Line Items]      
Total Collateral $ 115,700