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Fair Value of Financial Instruments - Valuation for Level 3 Assets (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Balance at beginning of period | $ 3,801,370 | $ 3,935,253 | $ 3,471,854
Total gains/(losses) (realized/unrealized) |  |  |
Included in earnings | 99,357 | (375,144) | 99,416
Transfers out | (52,791) | (18,858) | (4,133)
Transfers to securitization trust, net | 0 | 0 | 0
Transfer from disposal group held for sale | 0 | 0 |
Funding/Contributions | 55,882 | 28,086 | 145,143
Paydowns/Distributions | (1,171,740) | (1,501,232) | (1,281,879)
Sales | (25,144) |  | (77,127)
Purchases | 620,277 | 1,733,265 | 1,581,979
Balance at the end of period | $ 3,327,211 | $ 3,801,370 | $ 3,935,253
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 | $ 1,081,384 | $ 1,703,290 | $ 1,090,930
Total gains/(losses) (realized/unrealized) |  |  |
Included in earnings | 8,080 | (111,879) | 36,844
Transfers out | (26,277) | (17,052) | (2,080)
Transfers to securitization trust, net | (282,831) | (1,422,577) | (305,433)
Transfer from disposal group held for sale | 0 | 0 |
Funding/Contributions | 0 | 0 | 0
Paydowns/Distributions | (482,137) | (712,214) | (618,790)
Sales | (21,165) |  | (74,751)
Purchases | 550,481 | 1,641,816 | 1,576,570
Balance at the end of period | 827,535 | 1,081,384 | 1,703,290
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 | 827,582 | 1,070,882 | 1,266,785
Total gains/(losses) (realized/unrealized) |  |  |
Included in earnings | (10,748) | (128,236) | (35,953)
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 | 0
Paydowns/Distributions | (61,974) | (115,064) | (159,950)
Sales | 0 |  | 0
Purchases | 0 | 0 | 0
Balance at the end of period | 754,860 | 827,582 | 1,070,882
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 | 691,451
Total gains/(losses) (realized/unrealized) |  |  |
Included in earnings | 72,173 | (162,518) | 43,001
Transfers out | (16,208) | (1,806) | (2,053)
Transfers to securitization trust, net | 282,831 | 1,422,577 | 305,433
Transfer from disposal group held for sale | 0 | 0 |
Funding/Contributions | 0 | 0 | 0
Paydowns/Distributions | (518,819) | (535,017) | (239,436)
Sales | (3,979) |  | (2,376)
Purchases | 69,796 | 91,449 | 5,409
Balance at the end of period | 1,501,908 | 1,616,114 | 801,429
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 | 163,593
Total gains/(losses) (realized/unrealized) |  |  |
Included in earnings | 11,863 | 9,531 | 18,795
Transfers out | (10,306) | 0 | 0
Transfers to securitization trust, net | 0 | 0 | 0
Transfer from disposal group held for sale | 0 | 0 |
Funding/Contributions | 21,924 | 0 | 37,678
Paydowns/Distributions | (15,223) | (42,018) | (100,045)
Sales | 0 |  | 0
Purchases | 0 | 0 | 0
Balance at the end of period | 95,792 | 87,534 | 120,021
Equity investments |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Balance at beginning of period | 179,746 | 239,631 | 259,095
Total gains/(losses) (realized/unrealized) |  |  |
Included in earnings | 21,279 | 18,884 | 36,729
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 | 107,465
Paydowns/Distributions | (93,587) | (96,919) | (163,658)
Sales | 0 |  | 0
Purchases | 0 | 0 | 0
Balance at the end of period | 147,116 | 179,746 | 239,631
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 | 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 |  |
Purchases | 0 | 0 |
Balance at the end of period | $ 0 | $ 9,010 | $ 0

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- Definition Amount of gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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