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Net Interest Income (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
Total interest income	$ 46,220	$ 45,358	$ 47,970	$ 210,613	$ 199,772	$ 179,602	$ 167,258	$ 147,982	$ 350,161	$ 694,614	$ 455,799
Derivatives									868	711	831
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
Convertible notes
Interest expense									10,997	10,813	10,643
Subordinated debentures
Subordinated debentures									2,187	2,865	2,743
VIE, Primary Beneficiary
Total net interest income										1,819
Residential Loans
Interest income									69,170	63,031	19,659
Consolidated SLST | VIE, Primary Beneficiary
Interest income									45,194	4,764	0
Interest expense									31,663	2,945	0
Residential loans held in securitization trusts
Interest income									12,612	3,222	8,910
Total residential loans
Interest income									126,976	71,017	28,569
Preferred equity and mezzanine loan investments
Interest income									20,899	20,899	21,036
Consolidated K-Series | VIE, Primary Beneficiary
Interest income									151,841	535,226	358,712
Interest expense									129,762	457,130	313,102
Total multi-family loans
Interest income									172,740	556,125	379,748
Investment securities available for sale
Investment securities available for sale									49,925	65,486	47,147
Other
Other									520	1,986	335
Repurchase agreements
Repurchase agreements and other interest bearing liabilities									37,334	90,110	43,219
Residential loan securitizations
Interest expense									6,967	1,682	3,623
Non-Agency RMBS and CMBS re-securitizations
Interest expense									3,290	494	2,910
Total collateralized debt obligations
Interest expense									$ 171,682	$ 462,251	$ 319,635

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