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Net Interest Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Total interest income	$ 258,388	$ 206,866	$ 350,161
Derivatives	0	0	868
Total interest expense	129,419	79,284	223,068
Total net interest income	128,969	127,582	127,093
Convertible notes
Interest expense	438	11,196	10,997
Senior unsecured notes
Senior unsecured notes	6,430	4,335	0
Subordinated debentures
Subordinated debentures	2,590	1,831	2,187
Residential loans
Interest income	113,131	83,852	69,170
Consolidated SLST | VIE, Primary Beneficiary
Interest income	36,448	40,944	45,194
Interest expense	25,145	28,135	31,663
Residential loans held in securitization trusts
Interest income	80,119	38,941	12,612
Total residential loans
Interest income	229,698	163,737	126,976
Preferred equity and mezzanine loan investments
Interest income	11,185	15,321	20,899
Consolidated K-Series | VIE, Primary Beneficiary
Interest income	0	0	151,841
Interest expense	0	0	129,762
Total multi-family loans
Interest income	11,185	15,321	172,740
Investment securities available for sale
Investment securities available for sale	15,825	27,750	49,925
Other
Other	1,680	58	520
Repurchase agreements
Interest expense	51,432	13,844	37,334
Residential loan securitizations
Interest expense	43,384	19,660	6,967
Non-Agency RMBS re-securitization
Interest expense	0	283	3,290
Total collateralized debt obligations
Interest expense	$ 68,529	$ 48,078	$ 171,682

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