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Fair Value of Financial Instruments - Valuation for Level 3 Assets (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2023 | Mar. 31, 2022
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Balance at beginning of period | $ 3,801,370 | $ 3,935,253
Total (losses)/gains (realized/unrealized) |  |
Included in earnings | 54,963 | (115,934)
Transfers out | (326) | (879)
Transfers to securitization trust, net | 0 | 0
Funding/Contributions | 21,948 | 19,191
Paydowns/Distributions | (294,927) | (330,853)
Sales | (166) | (320)
Purchases | 88,521 | 782,477
Balance at the end of period | $ 3,671,383 | $ 4,288,935
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
Consolidated SLST | VIE, Primary Beneficiary | Residential loans |  |
Total (losses)/gains (realized/unrealized) |  |
Sales | $ 0 |
Residential loans |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Balance at beginning of period | 1,081,384 | $ 1,703,290
Total (losses)/gains (realized/unrealized) |  |
Included in earnings | (599) | (24,571)
Transfers out | (93) | (90)
Transfers to securitization trust, net | (86,110) | (598,430)
Funding/Contributions | 0 | 0
Paydowns/Distributions | (141,355) | (126,575)
Sales |  | (320)
Purchases | 67,939 | 767,914
Balance at the end of period | 921,000 | 1,721,218
Residential loans | Residential loans |  |
Total (losses)/gains (realized/unrealized) |  |
Sales | (166) |
Residential loans | Consolidated SLST | VIE, Primary Beneficiary |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Balance at beginning of period | 827,582 | 1,070,882
Total (losses)/gains (realized/unrealized) |  |
Included in earnings | 15,121 | (67,685)
Transfers out | 0 | 0
Transfers to securitization trust, net | 0 | 0
Funding/Contributions | 0 | 0
Paydowns/Distributions | (13,550) | (33,344)
Sales |  | 0
Purchases | 0 | 0
Balance at the end of period | 829,153 | 969,853
Residential loans held in securitization trusts |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Balance at beginning of period | 1,616,114 | 801,429
Total (losses)/gains (realized/unrealized) |  |
Included in earnings | 33,041 | (33,729)
Transfers out | (233) | (789)
Transfers to securitization trust, net | 86,110 | 598,430
Funding/Contributions | 0 | 0
Paydowns/Distributions | (130,911) | (117,548)
Sales |  | 0
Purchases | 20,582 | 14,563
Balance at the end of period | 1,624,703 | 1,262,356
Residential loans held in securitization trusts | Residential loans |  |
Total (losses)/gains (realized/unrealized) |  |
Sales | 0 |
Multi-family loans |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Balance at beginning of period | 87,534 | 120,021
Total (losses)/gains (realized/unrealized) |  |
Included in earnings | 2,889 | 3,258
Transfers out | 0 | 0
Transfers to securitization trust, net | 0 | 0
Funding/Contributions | 6,420 | 0
Paydowns/Distributions | (1,534) | (13,071)
Sales |  | 0
Purchases | 0 | 0
Balance at the end of period | 95,309 | 110,208
Multi-family loans | Multi-family loans |  |
Total (losses)/gains (realized/unrealized) |  |
Sales | 0 |
Equity investments |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Balance at beginning of period | 179,746 | 239,631
Total (losses)/gains (realized/unrealized) |  |
Included in earnings | 3,451 | 6,793
Transfers out | 0 | 0
Transfers to securitization trust, net | 0 | 0
Funding/Contributions | 15,528 | 19,191
Paydowns/Distributions | (7,577) | (40,315)
Sales |  | 0
Purchases | 0 | 0
Balance at the end of period | 191,148 | $ 225,300
Equity investments | Equity investments |  |
Total (losses)/gains (realized/unrealized) |  |
Sales | 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 | 9,010 |
Total (losses)/gains (realized/unrealized) |  |
Included in earnings | 1,060 |
Transfers out | 0 |
Transfers to securitization trust, net | 0 |
Funding/Contributions | 0 |
Paydowns/Distributions | 0 |
Purchases | 0 |
Balance at the end of period | $ 10,070 |

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