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Multi-family Loans - Narrative (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Mar. 31, 2020 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net unrealized losses |  |  |  |  |  |  |  |  |  | $ 1,500 |  |  |
Net proceeds from sale of real estate held for sale in Consolidated VIEs |  |  |  |  |  |  |  |  |  | 0 | $ 3,587 | $ 33,192 |
Realized loss on de-consolidation of Consolidated K-Series |  | $ 0 | $ 0 | $ 0 | $ (54,118) |  |  |  |  | (54,118) | 0 | 0 |
Unrealized (losses) gains, net |  | 52,549 | $ 81,198 | $ 102,872 | (396,780) | $ 21,940 | $ 11,112 | $ 77 | $ 2,708 | (160,161) | 35,837 | 52,781 |
Carrying Value |  | $ 3,049,166 |  |  |  | 20,780,548 |  |  |  | 3,049,166 | 20,780,548 | 12,707,625 | $ 10,157,126
VIE, Primary Beneficiary | Consolidated K-Series |  |  |  |  |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Unrealized (losses) gains, net |  |  |  |  |  |  |  |  |  | $ (10,951) | 23,962 | $ 37,581 |
Deconsolidation of financial instruments | $ 17,400,000 |  |  |  | 17,400,000 |  |  |  |  |  |  |  |
Collateralized debt obligations, at fair value |  |  |  |  |  | 16,724,451 |  |  |  |  | 16,724,451 |  |
IOs and mezzanine securities transferred to available-for-sale securities from consolidated K-series due to de-consolidation | 237,300 |  |  |  | 237,300 |  |  |  |  |  |  |  |
K-series net carrying value |  |  |  |  |  | 1,100,000 |  |  |  |  | 1,100,000 |  |
VIE, Primary Beneficiary | Consolidated K-Series | Consolidated K-Series |  |  |  |  |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying Value |  |  |  |  |  | $ 16,800,000 |  |  |  |  | $ 16,800,000 |  |
VIE, Primary Beneficiary | Consolidated K-Series | Multi Family Collateralized Debt Obligations |  |  |  |  |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Collateralized debt obligations, at fair value | 16,600,000 |  |  |  | $ 16,600,000 |  |  |  |  |  |  |  |
VIE, Primary Beneficiary | First Loss POs And Mezzanine Securities Member | Consolidated K-Series |  |  |  |  |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net proceeds from sale of real estate held for sale in Consolidated VIEs | 555,200 |  |  |  |  |  |  |  |  |  |  |  |
Realized loss on de-consolidation of Consolidated K-Series | (54,100) |  |  |  |  |  |  |  |  |  |  |  |
Unrealized (losses) gains, net | $ 168,500 |  |  |  |  |  |  |  |  |  |  |  |

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- Definition IOs And Mezzanine Securities Transferred To Available-for-sale Securities From Consolidated K-Series Due To De-Consolidation + References No definition available. + Details
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- Definition Represents the aggregate carrying value of the investment in the multi-family loans held in securitization trusts. + 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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