Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Assets [Abstract]
Cash and cash equivalents	$ 279,028	$ 332,035
Cash collateral posted to counterparties	114,594	117,842
Mortgage-backed securities (including pledged of $3,012,970 and $2,810,957, respectively), at fair value	3,296,784	3,112,705
Due from counterparties	115,323	10,348
Derivative assets	37,179	7,102
Accrued interest receivable	17,234	15,260
Other assets, net	9,716	9,942
Total assets	3,869,858	3,605,234
Liabilities:
Repurchase agreements	2,937,124	2,644,405
Due to counterparties	24,918	4,159
Derivative liabilities	0	22,595
Cash collateral posted by counterparties	27,125	435
Accrued interest payable	12,806	16,450
Accrued dividends payable	9,214	9,103
Other liabilities	3,843	6,759
Total liabilities	3,015,030	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, 90,000,000 shares authorized; 53,876,914 and 53,637,095 shares issued and outstanding, respectively	539	536
Additional paid-in capital	1,361,000	1,357,514
Accumulated other comprehensive loss	(166,553)	(181,346)
Accumulated deficit	(448,001)	(383,219)
Total shareholders’ equity	854,828	901,328
Total liabilities and shareholders’ equity	$ 3,869,858	$ 3,605,234