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Use of Special Purpose Entities (SPE) and Variable Interest Entities (VIE) - Narrative (Details) $ in Thousands		3 Months Ended				12 Months Ended
	Mar. 14, 2019 USD ($)	Dec. 31, 2019 USD ($) securitization	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2019 USD ($) securitization	Dec. 31, 2018 USD ($) securitization	Dec. 31, 2017 USD ($)	Mar. 25, 2019 USD ($)
Variable Interest Entity [Line Items]
Loss on extinguishment of debt | $		$ 0	$ 0	$ 0	$ (2,857)	$ (2,857)	$ 0	$ 0
Unconsolidated VIE, maximum loss exposure | $		$ 400,900				$ 400,900	269,800
Multi-family CMBS Re-securitization
Variable Interest Entity [Line Items]
Securitized debt, principal amount | $	$ 33,200						$ 33,177
Loss on extinguishment of debt | $	$ (2,900)
Number of consolidated securitizations							1
Non-Financing VIEs, Multi-Family CMBS
Variable Interest Entity [Line Items]
Number of securitizations considered non-financing VIEs							8
Residential Mortgage Loan Securitization
Variable Interest Entity [Line Items]
Number of securitizations completed to date		4				4
Distressed residential mortgage loans
Variable Interest Entity [Line Items]
Securitized debt, principal amount | $							$ 12,381		$ 6,500
Number of securitizations, consolidated, accounted for as permanent financing		3				3
RBDHC
Variable Interest Entity [Line Items]
Equity method investment, cumulative percentage ownership after all transactions						100.00%
RBDHC | VIE, Primary Beneficiary
Variable Interest Entity [Line Items]
Variable interest entity, ownership percentage						50.00%
Consolidated K-Series | Non-Financing VIEs, Multi-Family CMBS
Variable Interest Entity [Line Items]
Number of securitizations considered non-financing VIEs		14				14	8
Consolidated K-Series | VIE, Primary Beneficiary
Variable Interest Entity [Line Items]
Number of consolidated securitizations		14				14	9

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Number of Consolidated Securitizations

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Number of Securitizations Completed to Date

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Number of Securitizations, Consolidated, Accounted for as Permanent Financing

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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Percentage of the Variable Interest Entity's (VIE) voting interest owned by (or beneficial interest in) the reporting entity (directly or indirectly).

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