Condensed Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Interest income	$ 50,107	$ 35,610	$ 128,030	$ 112,735
Interest expense	(58,705)	(21,361)	(149,593)	(32,196)
Net interest (expense) income	(8,598)	14,249	(21,563)	80,539
Unrealized losses on mortgage-backed securities and U.S. Treasury securities	(208,932)	(212,221)	(224,576)	(692,781)
Gains on derivative and other hedging instruments	142,042	183,931	194,253	464,796
Net portfolio loss	(75,488)	(80,184)	(51,886)	(280,118)
Management fees	2,870	2,616	8,216	7,881
Allocated overhead	557	522	1,772	1,482
Incentive compensation	322	212	1,110	763
Directors' fees and liability insurance	345	308	986	929
Audit, legal and other professional fees	301	293	1,200	899
Direct REIT operating expenses	193	175	531	683
Other administrative	56	203	652	624
Total expenses	4,644	4,329	14,467	13,261
Net loss	(80,132)	(84,513)	(66,353)	(293,379)
Unrealized gains on U.S. Treasury securities measured at fair value through other comprehensive net loss	16	0	16	0
Comprehensive net loss	$ (80,116)	$ (84,513)	$ (66,337)	$ (293,379)
Basic and diluted net loss per share (in dollars per share)	$ (1.68)	$ (2.40)	$ (1.58)	$ (8.31)
Weighted Average Shares Outstanding (in shares)	47,773,409	35,205,888	42,103,532	35,336,702
Dividends declared per common share (in dollars per share)	$ 0.480	$ 0.545	$ 1.440	$ 1.995
Collateralized Mortgage-Backed Securities [Member]
Realized losses on mortgage-backed securities	$ 0	$ (66,143)	$ 0	$ (132,672)