Borrowings (Details) - USD ($) | 3 Months Ended | 12 Months Ended |
Mar. 31, 2022 | Dec. 31, 2021 |
Debt Instrument [Line Items] | | |
Facility amount | $ 750,000,000 | |
Current balance | 473,311,000 | $ 393,889,000 |
Current balance | 1,593,435,000 | 1,651,706,000 |
Variable Interest Entity, Primary Beneficiary | | |
Debt Instrument [Line Items] | | |
Current balance | 477,000,000 | 398,000,000 |
Current balance | 1,593,435,000 | 1,651,706,000 |
Variable Interest Entity, Primary Beneficiary | Oportun RF, LLC | | |
Debt Instrument [Line Items] | | |
Initial note amount issued | 116,000,000 | |
Variable interest entity, balance | $ 103,869,000 | 114,092,000 |
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% | |
Credit Facility | Warehouse Facility | | |
Debt Instrument [Line Items] | | |
Facility amount | $ 600,000,000 | |
Current balance | $ 414,088,000 | 353,781,000 |
Credit Facility | Warehouse Facility | LIBOR | | |
Debt Instrument [Line Items] | | |
Interest Rate, basis spread minimum | 0.00% | |
Interest Rate, basis spread | 2.17% | |
Credit Facility | Secured Warehouse Facility CCW | | |
Debt Instrument [Line Items] | | |
Facility amount | $ 150,000,000 | |
Current balance | 59,223,000 | 40,108,000 |
Credit Facility | Secured Warehouse Facility CCW | Purchase Commitment | | |
Debt Instrument [Line Items] | | |
Facility amount | 75,000,000 | |
Credit Facility | Secured Warehouse Facility CCW | Uncommitted Purchase Amount | | |
Debt Instrument [Line Items] | | |
Facility 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% | |
Asset-Backed Notes | | |
Debt Instrument [Line Items] | | |
Initial note amount issued | $ 1,654,412,000 | 1,654,412,000 |
Current balance | 1,593,435,000 | 1,651,706,000 |
Asset-Backed Notes | Initial Collateral | | |
Debt Instrument [Line Items] | | |
Initial collateral balance | 1,703,271,000 | 1,703,271,000 |
Asset-Backed Notes | Current Collateral | | |
Debt Instrument [Line Items] | | |
Initial collateral balance | 1,730,866,000 | 1,737,245,000 |
Asset-Backed Notes | Oportun Issuance Trust (Series 2021-C) | | |
Debt Instrument [Line Items] | | |
Initial note amount issued | 500,000,000 | 500,000,000 |
Current balance | $ 472,972,000 | $ 497,774,000 |
Weighted average interest rate | 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 | $ 512,762,000 | $ 512,762,000 |
Asset-Backed Notes | Oportun Issuance Trust (Series 2021-C) | Current Collateral | | |
Debt Instrument [Line Items] | | |
Initial collateral balance | 519,735,000 | 525,436,000 |
Asset-Backed Notes | Oportun Issuance Trust (Series 2021-B) | | |
Debt Instrument [Line Items] | | |
Initial note amount issued | 500,000,000 | 500,000,000 |
Current balance | $ 475,772,000 | $ 498,487,000 |
Weighted average interest rate | 2.05% | 2.05% |
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 | $ 512,759,000 | $ 512,759,000 |
Asset-Backed Notes | Oportun Issuance Trust (Series 2021-B) | Current Collateral | | |
Debt Instrument [Line Items] | | |
Initial collateral balance | 520,594,000 | 521,174,000 |
Asset-Backed Notes | Oportun Funding XIV, LLC (Series 2021-A) | | |
Debt Instrument [Line Items] | | |
Initial note amount issued | 375,000,000 | 375,000,000 |
Current balance | $ 364,808,000 | $ 374,363,000 |
Weighted average interest rate | 1.79% | 1.79% |
Original revolving period | 2 years | 2 years |
Asset-Backed Notes | Oportun Funding XIV, LLC (Series 2021-A) | Initial Collateral | | |
Debt Instrument [Line Items] | | |
Initial collateral balance | $ 383,632,000 | $ 383,632,000 |
Asset-Backed Notes | Oportun Funding XIV, LLC (Series 2021-A) | Current Collateral | | |
Debt Instrument [Line Items] | | |
Initial collateral balance | 390,705,000 | 391,325,000 |
Asset-Backed Notes | Oportun Funding XIII, LLC (Series 2019-A) | | |
Debt Instrument [Line Items] | | |
Initial note amount issued | 279,412,000 | 279,412,000 |
Current balance | $ 279,883,000 | $ 281,082,000 |
Weighted average interest rate | 3.46% | 3.46% |
Original revolving period | 3 years | 3 years |
Asset-Backed Notes | Oportun Funding XIII, LLC (Series 2019-A) | Initial Collateral | | |
Debt Instrument [Line Items] | | |
Initial collateral balance | $ 294,118,000 | $ 294,118,000 |
Asset-Backed Notes | Oportun Funding XIII, LLC (Series 2019-A) | Current Collateral | | |
Debt Instrument [Line Items] | | |
Initial collateral balance | $ 299,832,000 | $ 299,310,000 |
Asset-Backed Notes | Secured Warehouse Facility CCW | LIBOR | Minimum | | |
Debt Instrument [Line Items] | | |
Basis spread on variable rate, outstanding principal | 0.00% | |
Asset-Backed Notes | Secured Warehouse Facility CCW | LIBOR | Maximum | | |
Debt Instrument [Line Items] | | |
Basis spread on variable rate, outstanding principal | 3.41% | |
Asset-Backed Notes | Credit Card Warehouse Facility | | |
Debt Instrument [Line Items] | | |
Principal threshold to trigger different interest rate | $ 18,800,000 | |