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Fair Value of Financial Instruments - Schedule of Valuation for Level 3 Assets (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Balance at beginning of period | $ 3,327,211 | $ 3,801,370 | $ 3,935,253
Total gains/(losses) (realized/unrealized) |  |  |
Included in earnings | 33,524 | 99,357 | (375,144)
Transfers out | (88,462) | (52,791) | (18,858)
Transfers to securitization trust, net | 0 | 0 | 0
Transfer from disposal group held for sale |  | 0 | 0
Funding/Contributions |  | 55,882 | 28,086
Paydowns/Distributions | (1,234,384) | (1,171,740) | (1,501,232)
Sales | (162,883) | (25,144) |
Acquisitions | 2,187,419 | 620,277 | 1,733,265
Balance at the end of period | $ 4,062,425 | $ 3,327,211 | $ 3,801,370
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Other Operating Income (Expense), Net | Other Operating Income (Expense), Net | Other Operating Income (Expense), Net
Residential loans |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Balance at beginning of period | $ 827,535 | $ 1,081,384 | $ 1,703,290
Total gains/(losses) (realized/unrealized) |  |  |
Included in earnings | 15,562 | 8,080 | (111,879)
Transfers out | (80,801) | (26,277) | (17,052)
Transfers to securitization trust, net | (1,456,376) | (282,831) | (1,422,577)
Transfer from disposal group held for sale |  | 0 | 0
Funding/Contributions |  | 0 |
Paydowns/Distributions | (296,645) | (482,137) | (712,214)
Sales | (156,175) | (21,165) |
Acquisitions | 1,779,166 | 550,481 | 1,641,816
Balance at the end of period | 632,266 | 827,535 | 1,081,384
Residential loans | VIE, Primary Beneficiary | Consolidated SLST |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Balance at beginning of period | 754,860 | 827,582 | 1,070,882
Total gains/(losses) (realized/unrealized) |  |  |
Included in earnings | 3,523 | (10,748) | (128,236)
Transfers out | 0 | 0 | 0
Transfers to securitization trust, net | 0 | 0 | 0
Transfer from disposal group held for sale |  | 0 | 0
Funding/Contributions |  | 0 | 0
Paydowns/Distributions | (77,768) | (61,974) | (115,064)
Sales | 0 | 0 |
Acquisitions | 285,057 | 0 | 0
Balance at the end of period | 965,672 | 754,860 | 827,582
Residential loans held in securitization trusts |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Balance at beginning of period | 1,501,908 | 1,616,114 | 801,429
Total gains/(losses) (realized/unrealized) |  |  |
Included in earnings | (8,255) | 72,173 | (162,518)
Transfers out | (7,661) | (16,208) | (1,806)
Transfers to securitization trust, net | 1,456,376 | 282,831 | 1,422,577
Transfer from disposal group held for sale |  | 0 | 0
Funding/Contributions |  | 0 | 0
Paydowns/Distributions | (805,586) | (518,819) | (535,017)
Sales | (6,708) | (3,979) |
Acquisitions | 113,726 | 69,796 | 91,449
Balance at the end of period | 2,243,800 | 1,501,908 | 1,616,114
Multi-family loans |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Balance at beginning of period | 95,792 | 87,534 | 120,021
Total gains/(losses) (realized/unrealized) |  |  |
Included in earnings | 5,899 | 11,863 | 9,531
Transfers out | 0 | (10,306) | 0
Transfers to securitization trust, net | 0 | 0 | 0
Transfer from disposal group held for sale |  | 0 | 0
Funding/Contributions |  | 21,924 | 0
Paydowns/Distributions | (15,499) | (15,223) | (42,018)
Sales | 0 | 0 |
Acquisitions | 0 | 0 | 0
Balance at the end of period | 86,192 | 95,792 | 87,534
Equity investments |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Balance at beginning of period | 147,116 | 179,746 | 239,631
Total gains/(losses) (realized/unrealized) |  |  |
Included in earnings | 16,179 | 21,279 | 18,884
Transfers out | 0 | 0 | 0
Transfers to securitization trust, net | 0 | 0 | 0
Transfer from disposal group held for sale |  | 5,720 | (9,936)
Funding/Contributions |  | 33,958 | 28,086
Paydowns/Distributions | (49,803) | (93,587) | (96,919)
Sales | 0 | 0 |
Acquisitions | 0 | 0 | 0
Balance at the end of period | 113,492 | 147,116 | 179,746
Mortgage servicing rights |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Balance at beginning of period | 0 |  |
Total gains/(losses) (realized/unrealized) |  |  |
Included in earnings | 616 |  |
Transfers out | 0 |  |
Transfers to securitization trust, net | 0 |  |
Paydowns/Distributions | 10,917 |  |
Sales | 0 |  |
Acquisitions | 9,470 |  |
Balance at the end of period | 21,003 | 0 |
Equity investments in disposal group held for sale |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Balance at beginning of period | $ 0 | 9,010 | 0
Total gains/(losses) (realized/unrealized) |  |  |
Included in earnings |  | (3,290) | (926)
Transfers out |  | 0 | 0
Transfers to securitization trust, net |  | 0 | 0
Transfer from disposal group held for sale |  | (5,720) | 9,936
Funding/Contributions |  | 0 | 0
Paydowns/Distributions |  | 0 | 0
Sales |  | 0 |
Acquisitions |  | 0 | 0
Balance at the end of period |  | $ 0 | $ 9,010

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