Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Interest income	$ 207,517	$ 86,695	$ 60,051
Interest expense	(215,448)	(43,612)	(5,671)
Net interest (expense) income	(7,931)	43,083	54,380
Realized (loss) gains on sales of investments, net	(74,916)	(89,067)	6,705
Unrealized gain (loss) on investments, net	142,501	(213,022)	(14,814)
(Loss) gain on derivative instruments, net	(32,905)	436,007	81,417
Total other gains, net	34,680	133,918	73,308
Noninterest Expense [Abstract]
Compensation and benefits	(16,929)	(16,808)	(12,757)
Other general and administrative	(13,799)	(15,545)	(11,328)
Other operating expenses	(2,151)	(1,487)	(1,342)
Total operating expenses	(32,879)	(33,840)	(25,427)
Net (loss) income	(6,130)	143,161	102,261
Preferred stock dividends	(7,694)	(7,694)	(8,329)
Preferred Stock Redemption Premium	0	0	(2,987)
Net (loss) income to common shareholders	(13,824)	135,467	90,945
Other comprehensive income:
Unrealized gain (loss) on available-for-sale investments, net	22,844	(202,063)	(66,827)
Reclassification of realized (loss) gain on available-for-sale investments, net	0	13,988	(6,705)
Total other comprehensive income (loss)	22,844	(188,075)	(73,532)
Comprehensive income (loss) to common shareholders	$ 9,020	$ (52,608)	$ 17,413
Weighted average common shares-basic (in shares)	54,809,462	42,491,433	32,596,272
Weighted average common shares-diluted (in shares)	54,809,462	42,743,037	32,761,331
Net income (loss) per common share-basic (in dollars per share)	$ (0.25)	$ 3.19	$ 2.79
Net income (loss) per common share-diluted (in dollars per share)	$ (0.25)	$ 3.17	$ 2.78