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Consolidated K-Series - Narrative (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Mar. 31, 2020 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |
Proceeds from sale and divestiture of securities |  |  |  | $ 0 | $ 3,587 |
Realized loss on de-consolidation of multi-family loans held in securitization trusts and multi-family collateralized debt obligations, net |  | $ 0 | $ 0 | 54,118 | 0 |
Reversal of unrealized gain |  | $ (81,198) | (11,112) | 212,711 | (13,898) |
Consolidated K-Series | VIE, Primary Beneficiary |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |
Reversal of unrealized gain |  |  | $ (7,630) | $ 10,951 | $ (22,247) |
Multi-family loans held in securitization trusts, at Fair Value | $ 17,400,000 |  |  |  |  |
Collateralized debt obligations |  |  |  |  |  | $ 16,724,451
Residential mortgage loans | 237,300 |  |  |  |  |
K-Series, carrying value |  |  |  |  |  | 1,100,000
Consolidated K-Series | VIE, Primary Beneficiary | Multi-family collateralized debt obligations |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |
Collateralized debt obligations | 16,600,000 |  |  |  |  |
Carrying Value |  |  |  |  |  | $ 16,800,000
Weighted average interest rate |  |  |  |  |  | 3.85%
Consolidated K-Series | VIE, Primary Beneficiary | Multi-family loans held in securitization trusts |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |
Carrying Value |  |  |  |  |  | $ 16,800,000
Consolidated K-Series | Fist Loss POs And Mezzanine Securities | VIE, Primary Beneficiary |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |
Proceeds from sale and divestiture of securities | 555,200 |  |  |  |  |
Realized loss on de-consolidation of multi-family loans held in securitization trusts and multi-family collateralized debt obligations, net | 54,100 |  |  |  |  |
Reversal of unrealized gain | $ 168,500 |  |  |  |  |

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- Definition IOs And Mezzanine Securities Transferred to Avaliable for sale securities From Consolidated K-Series Due To De-Consolidation + References No definition available. + Details
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- Definition Amount of gain (loss) from deconsolidation of subsidiary and derecognition of group of assets constituting transfer of business or nonprofit activity, excluding conveyance of oil and gas mineral rights and transfer of good or service in contract with customer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1B -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109239629&loc=SL4582445-111684 + Details
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- Definition Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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