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Use of Special Purpose Entities (SPE) and Variable Interest Entities (VIE) - Narrative (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended |
--- | --- | --- | ---
Mar. 31, 2019 | Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2019
Variable Interest Entity [Line Items] |  |  |  |
Loss on extinguishment of debt |  | $ 0 | $ 2,857 |
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 |  | 54,118 | 0 |
Reversal of unrealized gain |  | 396,780 | (2,708) |
Unconsolidated VIE, maximum loss exposure |  | $ 415,300 |  | $ 400,900
RBDHC |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Ownership percentage |  | 100.00% |  |
Receivables and other assets |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Real estate under development |  | $ 14,800 |  | $ 14,500
VIE, Primary Beneficiary | Consolidated K-Series |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Proceeds from sale and divestiture of securities |  | 555,200 |  |
Reversal of unrealized gain |  | 10,951 | (9,410) |
Securities owned, fair value |  | $ 237,300 |  |
VIE, Primary Beneficiary | RBDHC |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Noncontrolling interest, ownership by parent, percentage |  | 50.00% |  |
VIE, Primary Beneficiary | Fist Loss POs And Mezzanine Securities | Consolidated K-Series |  |  |  |
Variable Interest Entity [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 |  |
VIE, Primary Beneficiary | Multi-family CMBS Re-securitization | Consolidated K-Series |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Principal amount | $ 33,200 |  | $ 33,200 |
Loss on extinguishment of debt | $ (2,900) |  |  |
VIE, Primary Beneficiary | Multi-family loans held in securitization trust | Consolidated K-Series |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Proceeds from sale and divestiture of securities |  | 17,400,000 |  |
VIE, Primary Beneficiary | Multi-family collateralized debt obligations | Consolidated K-Series |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Proceeds from sale and divestiture of securities |  | $ 16,600,000 |  |

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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 The fair value as of the balance sheet date of firm holdings in mortgages, mortgage backed securities (investment instruments that represent ownership of an undivided interest in a group of mortgages, where principal and interest from the individual mortgages are used to pay investors' principal and interest on the mortgage backed security) and asset-backed securities that are primarily paid from the cash flows of a discrete pool of receivables or other financial assets (such as credit-card receivables), either fixed or revolving, that by their terms convert into cash within a finite time period. Includes both pledged (to counterparties as collateral for financing transactions) and unpledged holdings. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35711157&loc=d3e42546-110969 + Details
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- Definition Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=117329964&loc=d3e12355-112629 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=117329964&loc=d3e12317-112629 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 + Details
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- Definition This is the principal amount outstanding for securitized loans only (across all types of loans). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118948506&loc=d3e107314-111719 + Details
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