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Borrowings - Asset-backed Notes at Fair Value, Narrative (Details) - USD ($) $ in Thousands		6 Months Ended
	Jun. 09, 2025	Jun. 30, 2025	Jun. 30, 2024
Debt Instrument [Line Items]
Repayments of asset-backed notes		$ 474,041	$ 225,950
Oportun Issuance Trust (Series 2022-3) | Asset-Backed Notes
Debt Instrument [Line Items]
Repayments of asset-backed notes	$ 31,900
Oportun Issuance Trust (Series 2022-2) | Asset-Backed Notes
Debt Instrument [Line Items]
Repayments of asset-backed notes	$ 21,600

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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