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Net Interest Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Total interest income	$ 206,866	$ 350,161	$ 694,614
Derivatives	0	868	711
Total interest expense	83,248	223,068	566,750
Total net interest income	123,618	127,093	127,864
Convertible debt
Interest expense	11,196	10,997	10,813
Senior unsecured notes
Senior unsecured notes	4,335	0	0
Subordinated debentures
Subordinated debentures	1,831	2,187	2,865
Residential loans
Interest income	83,852	69,170	63,031
Consolidated SLST | VIE, Primary Beneficiary
Interest income	40,944	45,194	4,764
Interest expense	28,135	31,663	2,945
Residential loans held in securitization trusts
Interest income	38,941	12,612	3,222
Total residential loans
Interest income	163,737	126,976	71,017
Preferred equity and mezzanine loan investments
Interest income	15,321	20,899	20,899
Consolidated K-Series | VIE, Primary Beneficiary
Interest income	0	151,841	535,226
Interest expense	0	129,762	457,130
Total multi-family loans
Interest income	15,321	172,740	556,125
Investment securities available for sale
Investment securities available for sale	27,750	49,925	65,486
Other
Other	58	520	1,986
Mortgages payable on operating real estate	3,964	0	0
Repurchase agreements
Interest expense	13,844	37,334	90,110
Residential loan securitizations
Interest expense	19,660	6,967	1,682
Non-Agency RMBS and CMBS re-securitizations
Interest expense	283	3,290	494
Total collateralized debt obligations
Interest expense	$ 48,078	$ 171,682	$ 462,251

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