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Fair Value Measurements - Schedule of Assets and Liabilities Measured on Recurring Basis (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2023 | Dec. 31, 2022
Assets |  |  |
Investments in AFS debt securities | $ 486,091 | $ 486,091 | $ 195,438
Servicing rights | 142,654 | 142,654 | 149,854
Digital assets safeguarding asset | 139,359 | 139,359 | 106,826
Liabilities |  |  |
Residual interests classified as debt | 10,194 | 10,194 | 17,048
Digital assets safeguarding liability | 139,359 | 139,359 | 106,826
Unpaid principal related to debt measured at fair value | 142,660 | 142,660 | 98,868
Losses from changes in fair value | 517 | 1,150 |
Fair Value |  |  |
Assets |  |  |
Total assets | 3,753,992 | 3,753,992 | 2,203,728
Liabilities |  |  |
Debt | 5,869,008 | 5,869,008 | 5,045,816
Total liabilities | 21,532,206 | 21,532,206 | 12,385,976
Fair Value | Fair Value, Recurring |  |  |
Assets |  |  |
Investments in AFS debt securities | 486,091 | 486,091 | 195,438
Loans at fair value | 20,993,836 | 20,993,836 | 13,557,074
Servicing rights | 142,654 | 142,654 | 149,854
Digital assets safeguarding asset | 139,359 | 139,359 | 106,826
Total assets | 21,868,823 | 21,868,823 | 14,245,213
Liabilities |  |  |
Debt | 131,863 | 131,863 | 89,142
Digital assets safeguarding liability | 139,359 | 139,359 | 106,826
Total liabilities | 295,206 | 295,206 | 222,583
Fair Value | Asset-backed bonds | Fair Value, Recurring |  |  |
Assets |  |  |
Asset-backed bonds and residual investments | 58,191 | 58,191 | 155,093
Fair Value | Residual investments | Fair Value, Recurring |  |  |
Assets |  |  |
Asset-backed bonds and residual investments | 35,456 | 35,456 | 46,238
Fair Value | Third party warrants | Fair Value, Recurring |  |  |
Assets |  |  |
Derivative assets | 630 | 630 | 630
Fair Value | Derivative assets | Fair Value, Recurring |  |  |
Assets |  |  |
Derivative assets | 3,529 | 3,529 | 24,612
Fair Value | Purchase price earn out | Fair Value, Recurring |  |  |
Assets |  |  |
Derivative assets | 0 | 0 | 54
Fair Value | IRLCs | Fair Value, Recurring |  |  |
Assets |  |  |
Derivative assets | 1,545 | 1,545 | 216
Fair Value | Student loan commitments | Fair Value, Recurring |  |  |
Assets |  |  |
Student loan commitments | 1,751 | 1,751 | 0
Liabilities |  |  |
Student loan commitments | 0 | 0 | 236
Fair Value | Interest rate caps | Fair Value, Recurring |  |  |
Assets |  |  |
Derivative assets | 5,781 | 5,781 | 9,178
Fair Value | Residual interests classified as debt | Fair Value, Recurring |  |  |
Liabilities |  |  |
Residual interests classified as debt | 10,194 | 10,194 | 17,048
Fair Value | Derivative liabilities | Fair Value, Recurring |  |  |
Liabilities |  |  |
Derivative liabilities | 13,790 | 13,790 | 9,331
Level 1 |  |  |
Assets |  |  |
Total assets | 3,297,017 | 3,297,017 | 1,846,302
Liabilities |  |  |
Debt | 937,024 | 937,024 | 826,242
Total liabilities | 937,024 | 937,024 | 826,242
Level 1 | Fair Value, Recurring |  |  |
Assets |  |  |
Investments in AFS debt securities | 437,291 | 437,291 | 137,032
Loans at fair value | 0 | 0 | 0
Servicing rights | 0 | 0 | 0
Digital assets safeguarding asset | 0 | 0 | 0
Total assets | 437,291 | 437,291 | 137,032
Liabilities |  |  |
Debt | 0 | 0 | 0
Digital assets safeguarding liability | 0 | 0 | 0
Total liabilities | 0 | 0 | 0
Level 1 | Asset-backed bonds | Fair Value, Recurring |  |  |
Assets |  |  |
Asset-backed bonds and residual investments | 0 | 0 | 0
Level 1 | Residual investments | Fair Value, Recurring |  |  |
Assets |  |  |
Asset-backed bonds and residual investments | 0 | 0 | 0
Level 1 | Third party warrants | Fair Value, Recurring |  |  |
Assets |  |  |
Derivative assets | 0 | 0 | 0
Level 1 | Derivative assets | Fair Value, Recurring |  |  |
Assets |  |  |
Derivative assets | 0 | 0 | 0
Level 1 | Purchase price earn out | Fair Value, Recurring |  |  |
Assets |  |  |
Derivative assets | 0 | 0 | 0
Level 1 | IRLCs | Fair Value, Recurring |  |  |
Assets |  |  |
Derivative assets | 0 | 0 | 0
Level 1 | Student loan commitments | Fair Value, Recurring |  |  |
Assets |  |  |
Student loan commitments | 0 | 0 | 0
Liabilities |  |  |
Student loan commitments | 0 | 0 | 0
Level 1 | Interest rate caps | Fair Value, Recurring |  |  |
Assets |  |  |
Derivative assets | 0 | 0 | 0
Level 1 | Residual interests classified as debt | Fair Value, Recurring |  |  |
Liabilities |  |  |
Residual interests classified as debt | 0 | 0 | 0
Level 1 | Derivative liabilities | Fair Value, Recurring |  |  |
Liabilities |  |  |
Derivative liabilities | 0 | 0 | 0
Level 2 |  |  |
Assets |  |  |
Total assets | 68,313 | 68,313 | 28,651
Liabilities |  |  |
Debt | 4,931,984 | 4,931,984 | 4,219,574
Total liabilities | 20,595,182 | 20,595,182 | 11,559,734
Level 2 | Fair Value, Recurring |  |  |
Assets |  |  |
Investments in AFS debt securities | 48,800 | 48,800 | 58,406
Loans at fair value | 0 | 0 | 0
Servicing rights | 0 | 0 | 0
Digital assets safeguarding asset | 139,359 | 139,359 | 106,826
Total assets | 255,660 | 255,660 | 354,115
Liabilities |  |  |
Debt | 131,863 | 131,863 | 89,142
Digital assets safeguarding liability | 139,359 | 139,359 | 106,826
Total liabilities | 285,012 | 285,012 | 205,299
Level 2 | Asset-backed bonds | Fair Value, Recurring |  |  |
Assets |  |  |
Asset-backed bonds and residual investments | 58,191 | 58,191 | 155,093
Level 2 | Residual investments | Fair Value, Recurring |  |  |
Assets |  |  |
Asset-backed bonds and residual investments | 0 | 0 | 0
Level 2 | Third party warrants | Fair Value, Recurring |  |  |
Assets |  |  |
Derivative assets | 0 | 0 | 0
Level 2 | Derivative assets | Fair Value, Recurring |  |  |
Assets |  |  |
Derivative assets | 3,529 | 3,529 | 24,612
Level 2 | Purchase price earn out | Fair Value, Recurring |  |  |
Assets |  |  |
Derivative assets | 0 | 0 | 0
Level 2 | IRLCs | Fair Value, Recurring |  |  |
Assets |  |  |
Derivative assets | 0 | 0 | 0
Level 2 | Student loan commitments | Fair Value, Recurring |  |  |
Assets |  |  |
Student loan commitments | 0 | 0 | 0
Liabilities |  |  |
Student loan commitments | 0 | 0 | 0
Level 2 | Interest rate caps | Fair Value, Recurring |  |  |
Assets |  |  |
Derivative assets | 5,781 | 5,781 | 9,178
Level 2 | Residual interests classified as debt | Fair Value, Recurring |  |  |
Liabilities |  |  |
Residual interests classified as debt | 0 | 0 | 0
Level 2 | Derivative liabilities | Fair Value, Recurring |  |  |
Liabilities |  |  |
Derivative liabilities | 13,790 | 13,790 | 9,331
Level 3 |  |  |
Assets |  |  |
Total assets | 388,662 | 388,662 | 328,775
Liabilities |  |  |
Debt | 0 | 0 | 0
Total liabilities | 0 | 0 | 0
Level 3 | Fair Value, Recurring |  |  |
Assets |  |  |
Investments in AFS debt securities | 0 | 0 | 0
Loans at fair value | 20,993,836 | 20,993,836 | 13,557,074
Servicing rights | 142,654 | 142,654 | 149,854
Digital assets safeguarding asset | 0 | 0 | 0
Total assets | 21,175,872 | 21,175,872 | 13,754,066
Liabilities |  |  |
Debt | 0 | 0 | 0
Digital assets safeguarding liability | 0 | 0 | 0
Total liabilities | 10,194 | 10,194 | 17,284
Level 3 | Asset-backed bonds | Fair Value, Recurring |  |  |
Assets |  |  |
Asset-backed bonds and residual investments | 0 | 0 | 0
Level 3 | Residual investments | Fair Value, Recurring |  |  |
Assets |  |  |
Asset-backed bonds and residual investments | 35,456 | 35,456 | 46,238
Level 3 | Third party warrants | Fair Value, Recurring |  |  |
Assets |  |  |
Derivative assets | 630 | 630 | 630
Level 3 | Derivative assets | Fair Value, Recurring |  |  |
Assets |  |  |
Derivative assets | 0 | 0 | 0
Level 3 | Purchase price earn out | Fair Value, Recurring |  |  |
Assets |  |  |
Derivative assets | 0 | 0 | 54
Level 3 | IRLCs | Fair Value, Recurring |  |  |
Assets |  |  |
Derivative assets | 1,545 | 1,545 | 216
Level 3 | Student loan commitments | Fair Value, Recurring |  |  |
Assets |  |  |
Student loan commitments | 1,751 | 1,751 | 0
Liabilities |  |  |
Student loan commitments | 0 | 0 | 236
Level 3 | Interest rate caps | Fair Value, Recurring |  |  |
Assets |  |  |
Derivative assets | 0 | 0 | 0
Level 3 | Residual interests classified as debt | Fair Value, Recurring |  |  |
Liabilities |  |  |
Residual interests classified as debt | 10,194 | 10,194 | 17,048
Level 3 | Derivative liabilities | Fair Value, Recurring |  |  |
Liabilities |  |  |
Derivative liabilities | $ 0 | $ 0 | $ 0

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