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Fair Value - Financial Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | --- | ---
Financial assets: |  |  |  |
Loans and investments, net | $ 12,377,806 | $ 14,254,674 | $ 11,981,048 | $ 5,285,868
Loans held-for-sale, net | 552,325 | 368,066 |  |
Securities held-to-maturity, net | 155,279 | 156,547 |  |
Financial liabilities: |  |  |  |
Credit and repurchase facilities | 3,237,827 | 3,841,814 |  |
Securitized debt | 6,935,010 | 7,849,270 |  |
Senior unsecured notes | 1,333,968 | 1,385,994 |  |
Convertible senior unsecured notes, net | 283,118 | 280,356 |  |
Junior subordinated notes | 143,896 | 143,128 |  |
Level 1 |  |  |  |
Financial assets: |  |  |  |
Loans and investments, net | 0 |  |  |
Loans held-for-sale, net | 0 |  |  |
Capitalized mortgage servicing rights, net | 0 |  |  |
Securities held-to-maturity, net | 0 |  |  |
Financial liabilities: |  |  |  |
Credit and repurchase facilities | 0 |  |  |
Securitized debt | 0 |  |  |
Senior unsecured notes | 1,214,331 |  |  |
Convertible senior unsecured notes, net | 0 |  |  |
Junior subordinated notes | 0 |  |  |
Level 2 |  |  |  |
Financial assets: |  |  |  |
Loans and investments, net | 0 |  |  |
Loans held-for-sale, net | 558,667 |  |  |
Capitalized mortgage servicing rights, net | 0 |  |  |
Securities held-to-maturity, net | 0 |  |  |
Financial liabilities: |  |  |  |
Credit and repurchase facilities | 413,326 |  |  |
Securitized debt | 0 |  |  |
Senior unsecured notes | 0 |  |  |
Convertible senior unsecured notes, net | 301,156 |  |  |
Junior subordinated notes | 0 |  |  |
Level 3 |  |  |  |
Financial assets: |  |  |  |
Loans and investments, net | 12,452,563 |  |  |
Loans held-for-sale, net | 7,784 |  |  |
Capitalized mortgage servicing rights, net | 510,472 |  |  |
Securities held-to-maturity, net | 129,390 |  |  |
Financial liabilities: |  |  |  |
Credit and repurchase facilities | 2,814,998 |  |  |
Securitized debt | 6,864,557 |  |  |
Senior unsecured notes | 0 |  |  |
Convertible senior unsecured notes, net | 0 |  |  |
Junior subordinated notes | 106,444 |  |  |
Carrying Value |  |  |  |
Financial assets: |  |  |  |
Loans and investments, net | 12,377,806 | 14,254,674 |  |
Loans held-for-sale, net | 551,707 | 354,070 |  |
Capitalized mortgage servicing rights, net | 391,254 |  |  |
Securities held-to-maturity, net | 155,279 | 156,547 |  |
Financial liabilities: |  |  |  |
Credit and repurchase facilities | 3,237,827 | 3,841,814 |  |
Securitized debt | 6,935,010 | 7,849,270 |  |
Senior unsecured notes | 1,333,968 | 1,385,994 |  |
Convertible senior unsecured notes, net | 283,118 | 280,356 |  |
Junior subordinated notes | 143,896 | 143,128 |  |
Fair Value |  |  |  |
Financial assets: |  |  |  |
Loans and investments, net | 12,452,563 | 14,468,418 |  |
Loans held-for-sale, net | 566,451 | 362,054 |  |
Capitalized mortgage servicing rights, net | 510,472 |  |  |
Securities held-to-maturity, net | 129,390 | 144,571 |  |
Financial liabilities: |  |  |  |
Credit and repurchase facilities | 3,228,324 | 3,828,192 |  |
Securitized debt | 6,864,557 | 7,560,541 |  |
Senior unsecured notes | 1,214,331 | 1,262,560 |  |
Convertible senior unsecured notes, net | 301,156 | 287,834 |  |
Junior subordinated notes | $ 106,444 | $ 103,977 |  |

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