Condensed Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Interest income	$ 39,911	$ 35,268	$ 77,923	$ 77,125
Interest expense	(48,671)	(8,180)	(90,888)	(10,835)
Net interest (expense) income	(8,760)	27,088	(12,965)	66,290
Unrealized losses on mortgage-backed securities and U.S. Treasury Notes	(69,539)	(170,598)	(15,644)	(480,560)
Gains on derivative and other hedging instruments	93,367	103,367	52,211	280,865
Net portfolio income (loss)	15,068	(55,586)	23,602	(199,934)
Management fees	2,704	2,631	5,346	5,265
Allocated overhead	639	519	1,215	960
Incentive compensation	318	314	788	551
Directors' fees and liability insurance	318	310	641	621
Audit, legal and other professional fees	448	302	899	606
Direct REIT operating expenses	173	183	338	508
Other administrative	219	294	596	421
Total expenses	4,819	4,553	9,823	8,932
Net income (loss)	$ 10,249	$ (60,139)	$ 13,779	$ (208,866)
Basic and diluted net income (loss) per share (in dollars per share)	$ 0.25	$ (1.70)	$ 0.35	$ (5.90)
Weighted Average Shares Outstanding (in shares)	40,210,844	35,406,832	39,356,054	35,403,193
Dividends declared per common share (in dollars per share)	$ 0.480	$ 0.675	$ 0.960	$ 1.450
Collateralized Mortgage-Backed Securities [Member]
Realized losses on mortgage-backed securities	$ 0	$ (15,443)	$ 0	$ (66,529)