Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Assets [Abstract]
Cash and cash equivalents	$ 271,168	$ 332,035
Cash collateral posted to counterparties	145,268	117,842
Mortgage-backed securities (including pledged of $5,279,554 and $2,810,957, respectively), at fair value	5,583,758	3,112,705
Due from counterparties	0	10,348
Derivative assets	4,594	7,102
Accrued interest receivable	26,756	15,260
Other assets, net	9,238	9,942
Total assets	6,040,782	3,605,234
Liabilities:
Repurchase agreements	5,002,230	2,644,405
Due to counterparties	152,955	4,159
Derivative liabilities	22,029	22,595
Cash collateral posted by counterparties	0	435
Accrued interest payable	43,168	16,450
Accrued dividends payable	9,972	9,103
Other liabilities	6,082	6,759
Total liabilities	5,236,436	2,703,906
Stockholders' Equity Attributable to Parent [Abstract]
Preferred stock, par value $0.01 per share; 50,000,000 shares authorized; 4,460,000 and 4,460,000 shares issued and outstanding, respectively ($111,500 and $111,500 aggregate liquidation preference, respectively)	107,843	107,843
Common stock, par value $0.01 per share, 180,000,000 shares authorized; 56,555,574 and 53,637,095 shares issued and outstanding, respectively	566	536
Additional paid-in capital	1,397,268	1,357,514
Accumulated other comprehensive loss	(217,770)	(181,346)
Accumulated deficit	(483,561)	(383,219)
Total shareholders’ equity	804,346	901,328
Total liabilities and shareholders’ equity	$ 6,040,782	$ 3,605,234