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Fair Value Measurements - Schedule of Assets and Liabilities Measured on Recurring Basis (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2024 | Dec. 31, 2023
Assets |  |
Investments in AFS debt securities | $ 838,506 | $ 595,187
Servicing rights | 240,752 | 180,469
Liabilities |  |
Residual interests classified as debt | 4,129 | 7,396
Unpaid principal related to debt measured at fair value | 114,960 | 128,619
Losses from changes in fair value | 1,427 |
Fair Value |  |
Assets |  |
Total assets | 5,522,462 | 4,563,441
Liabilities |  |
Debt | 2,757,289 | 4,979,822
Total liabilities | 24,360,243 | 23,592,644
Fair Value | Fair Value, Recurring |  |
Assets |  |
Investments in AFS debt securities | 838,506 | 595,187
Loans at fair value | 21,950,643 | 22,122,255
Servicing rights | 240,752 | 180,469
Digital assets safeguarding asset | 0 | 9,292
Total assets | 23,170,396 | 23,027,679
Liabilities |  |
Debt | 107,409 | 119,641
Digital assets safeguarding liability | 0 | 9,292
Total liabilities | 117,481 | 142,280
Fair Value | Asset-backed bonds | Fair Value, Recurring |  |
Assets |  |
Asset-backed bonds and residual investments | 98,739 | 70,828
Fair Value | Residual investments | Fair Value, Recurring |  |
Assets |  |
Asset-backed bonds and residual investments | 35,853 | 35,920
Fair Value | Third party warrants | Fair Value, Recurring |  |
Assets |  |
Derivative assets | 630 | 630
Fair Value | Derivative assets | Fair Value, Recurring |  |
Assets |  |
Derivative assets | 1,537 | 2,209
Fair Value | IRLCs | Fair Value, Recurring |  |
Assets |  |
Derivative assets | 2,436 | 2,155
Fair Value | Student loan commitments | Fair Value, Recurring |  |
Assets |  |
Student loan commitments | 314 | 5,465
Fair Value | Interest rate caps | Fair Value, Recurring |  |
Assets |  |
Derivative assets | 986 | 3,269
Fair Value | Residual interests classified as debt | Fair Value, Recurring |  |
Liabilities |  |
Residual interests classified as debt | 4,129 | 7,396
Fair Value | Derivative liabilities | Fair Value, Recurring |  |
Liabilities |  |
Derivative liabilities | 5,943 | 5,951
Level 1 |  |
Assets |  |
Total assets | 4,147,908 | 3,615,578
Liabilities |  |
Debt | 1,311,986 | 955,306
Total liabilities | 1,311,986 | 955,306
Level 1 | Fair Value, Recurring |  |
Assets |  |
Investments in AFS debt securities | 465,491 | 527,711
Loans at fair value | 0 | 0
Servicing rights | 0 | 0
Digital assets safeguarding asset | 0 | 0
Total assets | 465,491 | 527,711
Liabilities |  |
Debt | 0 | 0
Digital assets safeguarding liability | 0 | 0
Total liabilities | 0 | 0
Level 1 | Asset-backed bonds | Fair Value, Recurring |  |
Assets |  |
Asset-backed bonds and residual investments | 0 | 0
Level 1 | Residual investments | Fair Value, Recurring |  |
Assets |  |
Asset-backed bonds and residual investments | 0 | 0
Level 1 | Third party warrants | Fair Value, Recurring |  |
Assets |  |
Derivative assets | 0 | 0
Level 1 | Derivative assets | Fair Value, Recurring |  |
Assets |  |
Derivative assets | 0 | 0
Level 1 | IRLCs | Fair Value, Recurring |  |
Assets |  |
Derivative assets | 0 | 0
Level 1 | Student loan commitments | Fair Value, Recurring |  |
Assets |  |
Student loan commitments | 0 | 0
Level 1 | Interest rate caps | Fair Value, Recurring |  |
Assets |  |
Derivative assets | 0 | 0
Level 1 | Residual interests classified as debt | Fair Value, Recurring |  |
Liabilities |  |
Residual interests classified as debt | 0 | 0
Level 1 | Derivative liabilities | Fair Value, Recurring |  |
Liabilities |  |
Derivative liabilities | 0 | 0
Level 2 |  |
Assets |  |
Total assets | 92,805 | 83,551
Liabilities |  |
Debt | 1,445,303 | 4,024,516
Total liabilities | 23,048,257 | 22,637,338
Level 2 | Fair Value, Recurring |  |
Assets |  |
Investments in AFS debt securities | 373,015 | 67,476
Loans at fair value | 59,477 | 66,198
Servicing rights | 0 | 0
Digital assets safeguarding asset | 0 | 9,292
Total assets | 533,754 | 219,272
Liabilities |  |
Debt | 107,409 | 119,641
Digital assets safeguarding liability | 0 | 9,292
Total liabilities | 113,352 | 134,884
Level 2 | Asset-backed bonds | Fair Value, Recurring |  |
Assets |  |
Asset-backed bonds and residual investments | 98,739 | 70,828
Level 2 | Residual investments | Fair Value, Recurring |  |
Assets |  |
Asset-backed bonds and residual investments | 0 | 0
Level 2 | Third party warrants | Fair Value, Recurring |  |
Assets |  |
Derivative assets | 0 | 0
Level 2 | Derivative assets | Fair Value, Recurring |  |
Assets |  |
Derivative assets | 1,537 | 2,209
Level 2 | IRLCs | Fair Value, Recurring |  |
Assets |  |
Derivative assets | 0 | 0
Level 2 | Student loan commitments | Fair Value, Recurring |  |
Assets |  |
Student loan commitments | 0 | 0
Level 2 | Interest rate caps | Fair Value, Recurring |  |
Assets |  |
Derivative assets | 986 | 3,269
Level 2 | Residual interests classified as debt | Fair Value, Recurring |  |
Liabilities |  |
Residual interests classified as debt | 0 | 0
Level 2 | Derivative liabilities | Fair Value, Recurring |  |
Liabilities |  |
Derivative liabilities | 5,943 | 5,951
Level 3 |  |
Assets |  |
Total assets | 1,281,749 | 864,312
Liabilities |  |
Debt | 0 | 0
Total liabilities | 0 | 0
Level 3 | Fair Value, Recurring |  |
Assets |  |
Investments in AFS debt securities | 0 | 0
Loans at fair value | 21,891,166 | 22,056,057
Servicing rights | 240,752 | 180,469
Digital assets safeguarding asset | 0 | 0
Total assets | 22,171,151 | 22,280,696
Liabilities |  |
Debt | 0 | 0
Digital assets safeguarding liability | 0 | 0
Total liabilities | 4,129 | 7,396
Level 3 | Asset-backed bonds | Fair Value, Recurring |  |
Assets |  |
Asset-backed bonds and residual investments | 0 | 0
Level 3 | Residual investments | Fair Value, Recurring |  |
Assets |  |
Asset-backed bonds and residual investments | 35,853 | 35,920
Level 3 | Third party warrants | Fair Value, Recurring |  |
Assets |  |
Derivative assets | 630 | 630
Level 3 | Derivative assets | Fair Value, Recurring |  |
Assets |  |
Derivative assets | 0 | 0
Level 3 | IRLCs | Fair Value, Recurring |  |
Assets |  |
Derivative assets | 2,436 | 2,155
Level 3 | Student loan commitments | Fair Value, Recurring |  |
Assets |  |
Student loan commitments | 314 | 5,465
Level 3 | Interest rate caps | Fair Value, Recurring |  |
Assets |  |
Derivative assets | 0 | 0
Level 3 | Residual interests classified as debt | Fair Value, Recurring |  |
Liabilities |  |
Residual interests classified as debt | 4,129 | 7,396
Level 3 | Derivative liabilities | Fair Value, Recurring |  |
Liabilities |  |
Derivative liabilities | $ 0 | $ 0

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