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Multi-family 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
Condensed Income Statements, Captions [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
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) gains, 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
Condensed Income Statements, Captions [Line Items]
Net interest income										1,819
VIE, Primary Beneficiary | Consolidated K-Series
Condensed Income Statements, Captions [Line Items]
Interest income									151,841	535,226	358,712
Interest expense									129,762	457,130	313,102
Net interest income									22,079	78,096	45,610
Unrealized (losses) gains, net									(10,951)	23,962	37,581
Net (loss) income									$ 11,128	$ 102,058	$ 83,191

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