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Borrowings - Schedule of Asset-backed Borrowings (Details) - USD ($)
$ in Thousands
Mar. 31, 2025
Dec. 31, 2024
Debt Instrument [Line Items]    
Loans receivable at fair value $ 2,770,486 $ 2,778,523
Asset-backed borrowings at amortized cost 1,281,274 984,333
Pledged Asset    
Debt Instrument [Line Items]    
Loans receivable at fair value 1,280,960 982,582
Oportun Issuance Trust 2025-A    
Debt Instrument [Line Items]    
Asset-backed borrowings at amortized cost 420,393 0
Oportun Issuance Trust 2025-A | Pledged Asset    
Debt Instrument [Line Items]    
Loans receivable at fair value 425,107 0
Oportun Issuance Trust 2024-2    
Debt Instrument [Line Items]    
Asset-backed borrowings at amortized cost 157,510 188,316
Oportun Issuance Trust 2024-2 | Pledged Asset    
Debt Instrument [Line Items]    
Loans receivable at fair value 158,373 189,401
Oportun Issuance Trust 2024-1    
Debt Instrument [Line Items]    
Asset-backed borrowings at amortized cost 71,471 92,386
Oportun Issuance Trust 2024-1 | Pledged Asset    
Debt Instrument [Line Items]    
Loans receivable at fair value 71,709 92,759
Oportun CL Trust 2023-A    
Debt Instrument [Line Items]    
Asset-backed borrowings at amortized cost 196,064 195,855
Oportun CL Trust 2023-A | Pledged Asset    
Debt Instrument [Line Items]    
Loans receivable at fair value 197,390 197,390
Other Asset Backed Borrowings    
Debt Instrument [Line Items]    
Asset-backed borrowings at amortized cost 435,836 507,776
Other Asset Backed Borrowings | Pledged Asset    
Debt Instrument [Line Items]    
Loans receivable at fair value $ 428,381 $ 503,032