Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Interest income	$ 20,404	$ 15,714	$ 56,167	$ 43,000
Interest expense	(13,282)	(1,320)	(19,292)	(4,228)
Net interest income	7,122	14,394	36,875	38,772
Realized (loss) gain on sale of investments, net	(70,967)	0	(89,517)	6,705
Unrealized loss on investments, net	(69,197)	(3,085)	(245,551)	(2,981)
Gain on derivative instruments, net	96,947	9,603	423,570	64,463
Other operating expenses, net	(433)	(330)	(1,049)	(1,033)
Noninterest Expense [Abstract]
Compensation and benefits	(6,104)	(2,977)	(12,972)	(9,306)
Other general and administrative	(4,042)	(3,572)	(11,484)	(8,417)
Net income	(46,674)	14,033	99,872	88,203
Preferred stock dividends	(1,923)	(1,923)	(5,770)	(6,405)
Preferred stock redemption charge	0	0	0	(2,987)
Net (loss) income to common shareholders	(48,597)	12,110	94,102	78,811
Other comprehensive income:
Unrealized loss on available-for-sale investments, net	(65,133)	(9,139)	(217,383)	(53,320)
Reclassification adjustment for realized loss (gain) on available-for-sale investments, net	14,025	0	14,025	(6,705)
Total other comprehensive loss	(51,108)	(9,139)	(203,358)	(60,025)
Comprehensive (loss) income to common shareholders	$ (99,705)	$ 2,971	$ (109,256)	$ 18,786
Weighted average common shares-basic (in shares)	45,347,852	34,924,449	40,452,740	31,258,711
Weighted average common shares-diluted (in shares)	45,347,852	35,089,508	40,740,690	31,423,770
Net income (loss) per common share-basic (in dollars per share)	$ (1.07)	$ 0.35	$ 2.33	$ 2.52
Net income (loss) per common share-diluted (in dollars per share)	(1.07)	0.35	2.31	2.51
Common Stock, Dividends, Per Share, Declared	$ 0.39	$ 0.39	$ 1.17	$ 1.17