Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Assets [Abstract]
Cash and cash equivalents	$ 332,035	$ 366,023
Cash collateral posted to counterparties	117,842	55,284
Mortgage-backed securities (including pledged of $2,810,957 and $3,011,319, respectively), at fair value	3,112,705	3,181,839
Mortgage loans held for investment, at fair value	2,617	4,268
Due from counterparties	10,348	2,771
Derivative assets	7,102	7,969
Accrued interest receivable	15,260	14,184
Other assets, net	7,325	7,400
Total assets	3,605,234	3,639,738
Liabilities:
Repurchase agreements	2,644,405	2,849,916
Due to counterparties	4,159	2,471
Derivative liabilities	22,595	0
Cash collateral posted by counterparties	435	1,834
Accrued interest payable	16,450	1,365
Accrued dividends payable	9,103	6,541
Other liabilities	6,759	6,332
Total liabilities	2,703,906	2,868,459
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; 53,637,095 and 36,665,805 shares issued and outstanding, respectively	536	367
Additional paid-in capital	1,357,514	1,107,792
Accumulated other comprehensive (loss) income	(181,346)	6,729
Accumulated deficit	(383,219)	(451,452)
Total shareholders’ equity	901,328	771,279
Total liabilities and shareholders’ equity	$ 3,605,234	$ 3,639,738