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Fair Value of Financial Instruments - Changes in Unrealized Gains (Losses) Included in Earnings for Level 3 (Details) - Level 3 - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
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 | $ (31,128) | $ 33,479 | $ 300
Change in unrealized gains (losses) – liabilities | 54,960 | (65,552) | (383)
Consolidated K-Series | 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 | 0 | 0 | 586,993
Change in unrealized gains (losses) – liabilities | 0 | 0 | (563,031)
Distressed And Other Residential Mortgage Loans At Fair Value |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Multi-family loans held in securitization trusts, at fair value | 31,222 | 16,449 | 44,470
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 | 35,570 | 17,785 | 0
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 | 1,924 | (682) | 0
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 | $ 3,990 | $ 256 | $ 5,374

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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 http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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- Definition Amount of unrealized gain (loss) recognized in income from liability 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 http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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