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Borrowings - Asset-backed Borrowings at Amortized Cost, Narrative (Details) - Asset-Backed Notes - Oportun Issuance Trust 2025-B $ in Thousands	Jun. 05, 2025 USD ($) class	Jun. 30, 2025 USD ($)
Debt Instrument [Line Items]
Original amount | $	$ 439,300	$ 439,250
Number of classes of fixed rate notes | class	5
Weighted average yield (as a percent)	5.67%
Weighted average interest rate (as a percent)		5.57%

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