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Residential Loans - Condensed Consolidated Statements of Operations (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	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
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Interest expense	$ 20,264	$ 19,829	$ 19,444	$ 163,531	$ 155,773	$ 147,631	$ 141,567	$ 121,779	$ 223,068	$ 566,750	$ 377,071
Total net interest income	25,956	25,529	28,526	47,082	43,999	31,971	25,691	26,203	127,093	127,864	78,728
Unrealized losses, net	$ (52,549)	$ (81,198)	$ (102,872)	$ 396,780	$ (21,940)	$ (11,112)	$ (77)	$ (2,708)	160,161	(35,837)	(52,781)
NET (LOSS) INCOME									(288,243)	172,896	$ 104,795
VIE, Primary Beneficiary
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Total net interest income										1,819
Consolidated SLST | VIE, Primary Beneficiary
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Interest income									45,194	4,764
Interest expense									31,663	2,945
Total net interest income									13,531
Unrealized losses, net									32,073	83
NET (LOSS) INCOME									(18,542)	1,736
Unrealized gain (loss) on real estate mortgage loans, net									33,479	300
Consolidated SLST | VIE, Primary Beneficiary | Collateralized debt obligations
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Unrealized losses, net									$ 65,600	$ 400

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