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Borrowings - Schedule of Asset-backed Notes at Fair Value (Details) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2025
Dec. 31, 2024
Debt Instrument [Line Items]    
Current note balance $ 617,904 $ 1,080,690
Asset-Backed Notes | Asset-Backed Notes, At Fair Value    
Debt Instrument [Line Items]    
Initial note amount issued 2,100,000 2,475,000
Current note balance 617,904 1,080,690
Asset-Backed Notes | Asset-Backed Notes, At Fair Value | Initial Collateral    
Debt Instrument [Line Items]    
Initial collateral balance 2,156,937 2,540,569
Asset-Backed Notes | Asset-Backed Notes, At Fair Value | Current Collateral    
Debt Instrument [Line Items]    
Initial collateral balance 676,224 1,169,941
Asset-Backed Notes | Oportun Issuance Trust (Series 2022-3)    
Debt Instrument [Line Items]    
Initial note amount issued 300,000 300,000
Current note balance $ 0 $ 54,463
Weighted average interest rate (as a percent) 0.00% 11.43%
Asset-Backed Notes | Oportun Issuance Trust (Series 2022-3) | Initial Collateral    
Debt Instrument [Line Items]    
Initial collateral balance $ 310,993 $ 310,993
Asset-Backed Notes | Oportun Issuance Trust (Series 2022-3) | Current Collateral    
Debt Instrument [Line Items]    
Initial collateral balance 0 62,323
Asset-Backed Notes | Oportun Issuance Trust (Series 2022-2)    
Debt Instrument [Line Items]    
Initial note amount issued 400,000 400,000
Current note balance $ 0 $ 40,453
Weighted average interest rate (as a percent) 0.00% 10.82%
Asset-Backed Notes | Oportun Issuance Trust (Series 2022-2) | Initial Collateral    
Debt Instrument [Line Items]    
Initial collateral balance $ 410,212 $ 410,212
Asset-Backed Notes | Oportun Issuance Trust (Series 2022-2) | Current Collateral    
Debt Instrument [Line Items]    
Initial collateral balance 0 46,578
Asset-Backed Notes | Oportun Issuance Trust (Series 2022-A)    
Debt Instrument [Line Items]    
Initial note amount issued 400,000 400,000
Current note balance $ 158,831 $ 261,939
Weighted average interest rate (as a percent) 6.04% 5.65%
Original revolving period 2 years 2 years
Asset-Backed Notes | Oportun Issuance Trust (Series 2022-A) | Initial Collateral    
Debt Instrument [Line Items]    
Initial collateral balance $ 410,211 $ 410,211
Asset-Backed Notes | Oportun Issuance Trust (Series 2022-A) | Current Collateral    
Debt Instrument [Line Items]    
Initial collateral balance 176,423 280,234
Asset-Backed Notes | Oportun Issuance Trust (Series 2021-C)    
Debt Instrument [Line Items]    
Initial note amount issued 500,000 500,000
Current note balance $ 280,905 $ 427,872
Weighted average interest rate (as a percent) 2.48% 2.48%
Original revolving period 3 years 3 years
Asset-Backed Notes | Oportun Issuance Trust (Series 2021-C) | Initial Collateral    
Debt Instrument [Line Items]    
Initial collateral balance $ 512,762 $ 512,762
Asset-Backed Notes | Oportun Issuance Trust (Series 2021-C) | Current Collateral    
Debt Instrument [Line Items]    
Initial collateral balance 303,018 460,500
Asset-Backed Notes | Oportun Issuance Trust (Series 2021-B)    
Debt Instrument [Line Items]    
Initial note amount issued 500,000 500,000
Current note balance $ 178,168 $ 295,963
Weighted average interest rate (as a percent) 2.06% 2.06%
Original revolving period 3 years 3 years
Asset-Backed Notes | Oportun Issuance Trust (Series 2021-B) | Initial Collateral    
Debt Instrument [Line Items]    
Initial collateral balance $ 512,759 $ 512,759
Asset-Backed Notes | Oportun Issuance Trust (Series 2021-B) | Current Collateral    
Debt Instrument [Line Items]    
Initial collateral balance $ 196,783 320,306
Asset-Backed Notes | Oportun Funding XIV, LLC (Series 2021-A)    
Debt Instrument [Line Items]    
Initial note amount issued   375,000
Current note balance   $ 0
Weighted average interest rate (as a percent)   0.00%
Original revolving period   2 years
Asset-Backed Notes | Oportun Funding XIV, LLC (Series 2021-A) | Initial Collateral    
Debt Instrument [Line Items]    
Initial collateral balance   $ 383,632
Asset-Backed Notes | Oportun Funding XIV, LLC (Series 2021-A) | Current Collateral    
Debt Instrument [Line Items]    
Initial collateral balance   $ 0