Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Interest income	$ 63,271	$ 20,404	$ 136,329	$ 56,167
Interest expense	(65,533)	(13,282)	(141,983)	(19,292)
Net interest (expense) income	(2,262)	7,122	(5,654)	36,875
Realized loss on sales of investments, net	0	(70,967)	(74,916)	(89,517)
Unrealized loss on investments, net	(179,100)	(69,197)	(121,491)	(245,551)
Gain on derivative instruments, net	146,953	96,947	195,698	423,570
Total other (losses) gains, net	(32,147)	(43,217)	(709)	88,502
Noninterest Expense [Abstract]
Compensation and benefits	(4,572)	(6,104)	(11,939)	(12,972)
Other general and administrative	(3,269)	(4,042)	(10,471)	(11,484)
Other operating expenses	(801)	(433)	(1,662)	(1,049)
Total operating expenses	(8,642)	(10,579)	(24,072)	(25,505)
Net (loss) income	(43,051)	(46,674)	(30,435)	99,872
Preferred stock dividends	(1,923)	(1,923)	(5,770)	(5,770)
Net (loss) income to common shareholders	(44,974)	(48,597)	(36,205)	94,102
Other comprehensive income:
Unrealized loss on available-for-sale investments, net	(41,774)	(65,133)	(36,424)	(217,383)
Reclassification of realized loss on available-for-sale investments, net	0	14,025	0	14,025
Total other comprehensive loss	(41,774)	(51,108)	(36,424)	(203,358)
Comprehensive loss to common shareholders	$ (86,748)	$ (99,705)	$ (72,629)	$ (109,256)
Weighted average common shares-basic (in shares)	54,556,853	45,347,852	54,175,367	40,452,740
Weighted average common shares-diluted (in shares)	54,556,853	45,347,852	54,175,367	40,740,690
Net income (loss) per common share-basic (in dollars per share)	$ (0.82)	$ (1.07)	$ (0.67)	$ 2.33
Net income (loss) per common share-diluted (in dollars per share)	(0.82)	(1.07)	(0.67)	2.31
Common Stock, Dividends, Per Share, Declared	$ 0.39	$ 0.39	$ 1.17	$ 1.17