Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020		Sep. 30, 2021	Sep. 30, 2020
Net interest income
Interest income	$ 14,372	$ 10,492		$ 39,900	$ 26,899
Interest expense	(7,790)	(6,102)		(21,876)	(14,649)
Total net interest income	6,582	4,390		18,024	12,250
Other income (loss)
Change in unrealized gain (loss) on CMBS structured pass through certificates	355	(200)		794	101
Change in unrealized gain on common stock	1,362	0		4,695	0
Loan loss benefit (provision)	6	14		(101)	(279)
Dividend income, net	0	1,305		0	3,557
Realized losses	0	0		(257)	0
Other income	0	0		774	0
Total other income (loss)	21,963	10,039		54,830	2,172
Operating expenses
General and administrative expenses	1,476	1,167		4,810	2,361
Loan servicing fees	1,327	1,241		3,942	3,088
Management fees	551	480		1,587	1,027
Total operating expenses	3,354	2,888		10,339	6,476
Net income	25,191	11,541		62,515	7,946
Net (income) attributable to preferred shareholders	(874)	(874)		(2,626)	(874)
Net (income) attributable to redeemable noncontrolling interests	(11,084)	(7,805)		(32,747)	(5,293)
Net income attributable to common stockholders	$ 13,233	$ 2,862		$ 27,142	$ 1,779
Weighted-average common shares outstanding - basic (in shares)	6,863	5,261		5,738	5,253
Weighted-average common shares outstanding - diluted (in shares)	20,721	5,550		19,846	5,379
Earnings per share - basic (in dollars per share)	$ 1.93	$ 0.54		$ 4.73	$ 0.34
Earnings per share - diluted (in dollars per share)	1.17	0.52	[1]	3.02	0.33	[1]
Dividends declared per common share (in dollars per share)	$ 0.4750	$ 0.4000		$ 1.4250	$ 1.0198
Variable Interest Entity, Primary Beneficiary [Member]
Other income (loss)
Change in net assets related to consolidated CMBS variable interest entities	$ 20,240	$ 8,920		$ 48,925	$ (1,207)
Change in unrealized gain (loss) on CMBS structured pass through certificates	$ 12,421	$ 3,903		$ 28,982	$ (11,231)

[1] Unvested restricted stock units, OP Units and SubOP Units are not included in the diluted earnings per share calculation for 2020.