Borrowings (Details) | Dec. 20, 2021USD ($) | Oct. 28, 2021USD ($) | Sep. 08, 2021USD ($) | May 10, 2021USD ($)class | Mar. 08, 2021USD ($) | Aug. 01, 2019 | Dec. 07, 2018 | Oct. 22, 2018 | Jul. 09, 2018 | Mar. 08, 2018 | Dec. 31, 2021USD ($) | Dec. 31, 2020USD ($) | Jul. 08, 2021USD ($) | Apr. 08, 2021USD ($) |
Debt Instrument [Line Items] | | | | | | | | | | | | | | |
Current Balance | | | | | | | | | | | $ 393,889,000 | $ 246,385,000 | | |
Commitment Amount | | | | | | | | | | | 750,000,000 | | | |
Current balance | | | | | | | | | | | 1,651,706,000 | 1,167,309,000 | | |
Variable Interest Entity, Primary Beneficiary | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | |
Current Balance | | | | | | | | | | | 398,000,000 | 246,994,000 | | |
Current balance | | | | | | | | | | | 1,651,706,000 | $ 1,167,309,000 | | |
Variable Interest Entity, Primary Beneficiary | Oportun RF, LLC | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | |
Interest Rate, basis spread | 8.00% | | | | | | | | | | | | | |
Current Balance | | | | | | | | | | | 114,092,000 | | | |
Initial note amount issued | $ 116,000,000 | | | | | | | | | | $ 116,000,000 | | | |
Variable Interest Entity, Primary Beneficiary | Oportun RF, LLC | Minimum | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | |
Interest Rate, basis spread | | | | | | | | | | | 0.00% | | | |
Variable Interest Entity, Primary Beneficiary | Oportun RF, LLC | Maximum | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | |
Interest Rate, basis spread | | | | | | | | | | | 8.00% | | | |
Secured Warehouse Facility VFN | Minimum | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | |
Interest Rate, basis spread | | | | | | | | | | | | 0.00% | | |
Secured Warehouse Facility VFN | Maximum | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | |
Interest Rate, basis spread | | | | | | | | | | | | 2.45% | | |
Credit Facility | Secured Warehouse Facility CCW | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | |
Current Balance | | | | | | | | | | | $ 40,108,000 | | | |
Commitment Amount | | | | | | | | | | | 150,000,000 | | | |
Credit Facility | Secured Warehouse Facility CCW | Purchase Commitment | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | |
Commitment Amount | | | | | | | | | | | 75,000,000 | | | |
Credit Facility | Secured Warehouse Facility CCW | Uncommitted Purchase Amount | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | |
Commitment Amount | | | | | | | | | | | 75,000,000 | | | |
Credit Facility | Secured Warehouse Facility CCW | LIBOR | Minimum | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | |
Interest Rate, basis spread | | | | | | | | | | | | 1.00% | | |
Credit Facility | Secured Warehouse Facility CCW | LIBOR | Maximum | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | |
Interest Rate, basis spread | | | | | | | | | | | | 6.00% | | |
Credit Facility | Secured Warehouse Facility PLW | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | |
Current Balance | | | | | | | | | | | 353,781,000 | | | |
Commitment Amount | | | | | | | | | | | $ 600,000,000 | | | |
Credit Facility | Secured Warehouse Facility PLW | LIBOR | Minimum | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | |
Interest Rate, basis spread | | | | | | | | | | | 0.00% | | | |
Credit Facility | Secured Warehouse Facility PLW | LIBOR | Maximum | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | |
Interest Rate, basis spread | | | | | | | | | | | 2.17% | | | |
Credit Facility | Secured Warehouse Facility VFN | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | |
Current Balance | | | | | | | | | | | | $ 246,385,000 | | |
Commitment Amount | | | | | | | | | | | | 400,000,000 | | |
Repayments of facility | | | $ 219,000,000 | | | | | | | | | | | |
Credit Facility | New Warehouse Facility | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | |
Commitment Amount | | | $ 600,000,000 | | | | | | | | | | | |
Interest Rate, basis spread | | | 2.17% | | | | | | | | | | | |
Asset-backed Note | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | |
Initial note amount issued | | | | | | | | | | | $ 1,654,412,000 | 1,154,419,000 | | |
Current balance | | | | | | | | | | | 1,651,706,000 | 1,167,309,000 | | |
Asset-backed Note | Initial Collateral | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | |
Collateral balance | | | | | | | | | | | 1,703,271,000 | 1,226,888,000 | | |
Asset-backed Note | Current Collateral | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | |
Collateral balance | | | | | | | | | | | $ 1,737,245,000 | 1,248,996,000 | | |
Asset-backed Note | Secured Warehouse Facility CCW | LIBOR | Minimum | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | |
Basis spread on variable rate, outstanding principal | | | | | | | | | | | 0.00% | | | |
Asset-backed Note | Secured Warehouse Facility CCW | LIBOR | Maximum | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | |
Basis spread on variable rate, outstanding principal | | | | | | | | | | | 3.41% | | | |
Asset-backed Note | Oportun Issuance Trust (Series 2021-C) | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | |
Initial note amount issued | | | | | | | | | | | $ 500,000,000 | | | |
Weighted average interest rate | | | | | | | | | | | 2.48% | | | |
Current balance | | | | | | | | | | | $ 497,774,000 | | | |
Original revolving period | | | | | | | | | | | 3 years | | | |
Asset-backed Note | Oportun Issuance Trust (Series 2021-C) | Initial Collateral | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | |
Collateral balance | | | | | | | | | | | $ 512,762,000 | | | |
Asset-backed Note | Oportun Issuance Trust (Series 2021-C) | Current Collateral | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | |
Collateral balance | | | | | | | | | | | 525,436,000 | | | |
Asset-backed Note | Oportun Issuance Trust (Series 2021-B) | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | |
Initial note amount issued | | | | $ 500,000,000 | | | | | | | $ 500,000,000 | | | |
Weighted average interest rate | | | | 2.05% | | | | | | | 2.05% | | | |
Current balance | | | | | | | | | | | $ 498,487,000 | | | |
Original revolving period | | | | 3 years | | | | | | | 3 years | | | |
Number of debt classes | class | | | | 4 | | | | | | | | | | |
Asset-backed Note | Oportun Issuance Trust (Series 2021-B) | Initial Collateral | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | |
Collateral balance | | | | | | | | | | | $ 512,759,000 | | | |
Asset-backed Note | Oportun Issuance Trust (Series 2021-B) | Current Collateral | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | |
Collateral balance | | | | | | | | | | | 521,174,000 | | | |
Asset-backed Note | Oportun Funding XIV, LLC (Series 2021-A) | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | |
Initial note amount issued | | | | | $ 375,000,000 | | | | | | $ 375,000,000 | | | |
Weighted average interest rate | | | | | 1.79% | | | | | | 1.79% | | | |
Current balance | | | | | | | | | | | $ 374,363,000 | | | |
Original revolving period | | | | | 2 years | | | | | | 2 years | | | |
Asset-backed Note | Oportun Funding XIV, LLC (Series 2021-A) | Initial Collateral | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | |
Collateral balance | | | | | | | | | | | $ 383,632,000 | | | |
Asset-backed Note | Oportun Funding XIV, LLC (Series 2021-A) | Current Collateral | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | |
Collateral balance | | | | | | | | | | | 391,325,000 | | | |
Asset-backed Note | Oportun Funding XIII, LLC (Series 2019-A) | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | |
Initial note amount issued | | | | | | | | | | | $ 279,412,000 | $ 279,412,000 | | |
Weighted average interest rate | | | | | | | | | | | 3.46% | 3.46% | | |
Current balance | | | | | | | | | | | $ 281,082,000 | $ 283,299,000 | | |
Original revolving period | | | | | | 3 years | | | | | 3 years | | | |
Asset-backed Note | Oportun Funding XIII, LLC (Series 2019-A) | Initial Collateral | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | |
Collateral balance | | | | | | | | | | | $ 294,118,000 | 294,118,000 | | |
Asset-backed Note | Oportun Funding XIII, LLC (Series 2019-A) | Current Collateral | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | |
Collateral balance | | | | | | | | | | | 299,310,000 | 299,237,000 | | |
Asset-backed Note | Oportun Funding XII, LLC (Series 2018-D) | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | |
Initial note amount issued | | | $ 175,000,000 | | | | | | | | | $ 175,002,000 | | |
Weighted average interest rate | | | | | | | | | | | | 4.50% | | |
Current balance | | | | | | | | | | | | $ 178,182,000 | | |
Original revolving period | | | | | | | 3 years | | | | | | | |
Asset-backed Note | Oportun Funding XII, LLC (Series 2018-D) | Initial Collateral | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | |
Collateral balance | | | | | | | | | | | | 184,213,000 | | |
Asset-backed Note | Oportun Funding XII, LLC (Series 2018-D) | Current Collateral | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | |
Collateral balance | | | | | | | | | | | | 187,570,000 | | |
Asset-backed Note | Oportun Funding X, LLC (Series 2018-C) | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | |
Initial note amount issued | | | | | | | | | | | | $ 275,000,000 | $ 275,000,000 | |
Weighted average interest rate | | | | | | | | | | | | 4.39% | | |
Current balance | | | | | | | | | | | | $ 279,171,000 | | |
Original revolving period | | | | | | | | 3 years | | | | | | |
Asset-backed Note | Oportun Funding X, LLC (Series 2018-C) | Initial Collateral | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | |
Collateral balance | | | | | | | | | | | | 289,474,000 | | |
Asset-backed Note | Oportun Funding X, LLC (Series 2018-C) | Current Collateral | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | |
Collateral balance | | | | | | | | | | | | 294,710,000 | | |
Asset-backed Note | Oportun Funding IX, LLC (Series 2018-B) | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | |
Initial note amount issued | | | | | | | | | | | | $ 225,001,000 | | $ 225,000,000 |
Weighted average interest rate | | | | | | | | | | | | 4.18% | | |
Current balance | | | | | | | | | | | | $ 226,653,000 | | |
Original revolving period | | | | | | | | | 3 years | | | | | |
Asset-backed Note | Oportun Funding IX, LLC (Series 2018-B) | Initial Collateral | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | |
Collateral balance | | | | | | | | | | | | 236,854,000 | | |
Asset-backed Note | Oportun Funding IX, LLC (Series 2018-B) | Current Collateral | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | |
Collateral balance | | | | | | | | | | | | 241,237,000 | | |
Asset-backed Note | Oportun Funding VIII, LLC (Series 2018-A) | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | |
Initial note amount issued | | | | | $ 200,000,000 | | | | | | | $ 200,004,000 | | |
Weighted average interest rate | | | | | | | | | | | | 3.83% | | |
Current balance | | | | | | | | | | | | $ 200,004,000 | | |
Original revolving period | | | | | | | | | | 3 years | | | | |
Asset-backed Note | Oportun Funding VIII, LLC (Series 2018-A) | Initial Collateral | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | |
Collateral balance | | | | | | | | | | | | 222,229,000 | | |
Asset-backed Note | Oportun Funding VIII, LLC (Series 2018-A) | Current Collateral | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | |
Collateral balance | | | | | | | | | | | | $ 226,242,000 | | |
Asset-backed Note | Oportun Issuance Trust Series 2021-C | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | |
Interest Rate, basis spread | | 2.48% | | | | | | | | | | | | |
Initial note amount issued | | $ 500,000,000 | | | | | | | | | | | | |
Original revolving period | | 3 years | | | | | | | | | | | | |
Asset-backed Note | Credit Card Warehouse Facility | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | |
Initial note amount issued | $ 150,000,000 | | | | | | | | | | | | | |
Original revolving period | 2 years | | | | | | | | | | | | | |
Principal threshold to trigger different interest rate | $ 18,800,000 | | | | | | | | | | $ 18,800,000 | | | |
Asset-backed Note | Credit Card Warehouse Facility | LIBOR | Minimum | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | |
Interest Rate, basis spread | 1.00% | | | | | | | | | | | | | |
Basis spread on variable rate, outstanding principal | 0.00% | | | | | | | | | | | | | |
Asset-backed Note | Credit Card Warehouse Facility | LIBOR | Maximum | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | |
Interest Rate, basis spread | 6.00% | | | | | | | | | | | | | |
Basis spread on variable rate, outstanding principal | 3.41% | | | | | | | | | | | | | |