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Fair Value of Financial Instruments - Changes in Unrealized Gains (Losses) Included in Earnings for Level 3 (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Unrealized (losses) gains, net | Unrealized (losses) gains, net | Unrealized (losses) gains, net
Fair Value, Liability, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Unrealized (losses) gains, net | Unrealized (losses) gains, net | Unrealized (losses) gains, net
Level 3 | Consolidated SLST | VIE, Primary Beneficiary |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Multi-family loans held in securitization trusts, at fair value | $ (124,834) | $ (31,128) | $ 33,479
Consolidated SLST | 92,431 | 54,960 | (65,552)
Level 3 | Residential loans |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Multi-family loans held in securitization trusts, at fair value | (57,892) | 31,222 | 16,449
Level 3 | Residential loans held in securitization trusts |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Multi-family loans held in securitization trusts, at fair value | (219,647) | 35,570 | 17,785
Level 3 | Multi-family loans |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Multi-family loans held in securitization trusts, at fair value | (1,737) | 1,924 | (682)
Level 3 | Investments in unconsolidated entities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Multi-family loans held in securitization trusts, at fair value | (4,338) | 3,990 | 256
Level 3 | Equity investments in disposal group held for sale |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Multi-family loans held in securitization trusts, at fair value | $ (1,430) | $ 0 | $ 0

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- Definition Indicates line item in statement in which net income is reported that includes unrealized gain (loss) from asset measured at fair value using unobservable input (level 3) and still held. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
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- Definition Amount of unrealized gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3) and still held. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
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