v3.26.3
Servicing Assets (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Dec. 31, 2025
Servicing Assets And Liabilities Fair Value [Line Items]          
Gain (loss) on sales of loans, net $ (15,112) $ (15,116) $ (46,071) $ (44,363)  
Prosper Funding LLC          
Servicing Assets And Liabilities Fair Value [Line Items]          
Gain (loss) on sales of loans, net (15,112) (15,116) (46,071) (44,363)  
Servicing Assets          
Servicing Assets And Liabilities Fair Value [Line Items]          
Gain (loss) on sales of loans, net 5,500 3,500 14,500 9,700  
Outstanding principle 4,400,000   $ 4,400,000   $ 3,800,000
Maturity term one, in months     24 months   24 months
Maturity term two, in months     36 months   36 months
Maturity term three, in months     48 months   48 months
Maturity term four, in months     60 months   60 months
Maturity term five, in months     72 months    
Fixed interest rate, minimum (as a percent)     5.75%   5.75%
Fixed interest rate, maximum (as a percent)     33.00%   33.00%
Contractually specified servicing fees, late charges and ancillary fees 12,800 10,500 $ 36,100 30,000  
Servicing Assets | Prosper Funding LLC          
Servicing Assets And Liabilities Fair Value [Line Items]          
Gain (loss) on sales of loans, net 5,500 3,500 14,500 9,700  
Outstanding principle 4,400,000   $ 4,400,000   $ 3,800,000
Maturity term one, in months     24 months   24 months
Maturity term two, in months     36 months   36 months
Maturity term three, in months     48 months   48 months
Maturity term four, in months     60 months   60 months
Maturity term five, in months     72 months    
Fixed interest rate, minimum (as a percent)     5.75%   5.75%
Fixed interest rate, maximum (as a percent)     33.00%   33.00%
Contractually specified servicing fees, late charges and ancillary fees $ 14,000 $ 12,200 $ 39,900 $ 35,500