CONSOLIDATED STATEMENTS OF CASH FLOWS, (Unaudited) - USD ($)	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
CASH FLOWS FROM OPERATING ACTIVITIES
Net income (loss)	$ (14,351,000)	$ 5,653,000
Adjustments to reconcile net income (loss) to net cash (used in) provided by operating activities:
Stock based compensation and equity plan amortization	167,000	229,000
Realized and unrealized (gains) losses on mortgage-backed securities	(13,918,000)	(34,120,000)
Derivative, Gain (Loss) on Derivative, Net	67,744,000	47,964,000
Changes in operating assets and liabilities
Accrued interest receivable	2,137,000	(2,146,000)
Other assets	(533,000)	(27,000)
Accrued interest payable	(10,349,000)	5,447,000
Other liabilities	16,000	1,440,000
Due to affiliates	(32,000)	(57,000)
NET CASH (USED IN) PROVIDED BY OPERATING ACTIVITIES	30,881,000	24,383,000
From mortgage-backed securities investments
Purchases	(2,898,616,000)	(3,096,194,000)
Sales	2,692,230,000	1,948,079,000
Principal repayments	384,314,000	389,496,000
Proceeds from U.S. Treasury Securities	139,712,000	0
Payments on U.S. Treasury Securities	139,807,000	0
Net payments on reverse repurchase agreements	30,000	0
Payments on net settlement of to-be-announced securities	(1,993,000)	(9,846,000)
Purchase of interest rate swaptions, net of margin cash received	66,135,000	20,032,000
NET CASH USED IN INVESTING ACTIVITIES	109,735,000	(788,497,000)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from repurchase agreements	27,995,556,000	33,804,965,000
Principal payments on repurchase agreements	(28,162,359,000)	(33,016,040,000)
Cash dividends	(40,065,000)	(38,156,000)
Proceeds From Issuance Of Common Stock, net of issuance costs	35,013,000	92,322,000
Payments For Repurchase Of Common Stock	70,000	3,024,000
NET CASH PROVIDED BY FINANCING ACTIVITIES	(171,925,000)	840,067,000
NET INCREASE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH	(31,309,000)	75,953,000
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, beginning of period	278,655,000	126,263,000
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, end of period	247,346,000	202,216,000
Cash paid during the period for:
Interest Paid	33,395,000	58,197,000
SUPPLEMENTAL DISCLOSURES OF NONCASH FINANCING ACTIVITIES:
Securities acquired settled in later period	113,653,000	0
Securities Sold Settled In Later Period	0	209,241,000
Interest Rate Swaption [Member]
Adjustments to reconcile net income (loss) to net cash (used in) provided by operating activities:
Derivative, Gain (Loss) on Derivative, Net	4,848,000	1,379,000
Swap [Member]
Adjustments to reconcile net income (loss) to net cash (used in) provided by operating activities:
Derivative, Gain (Loss) on Derivative, Net	60,988,000	42,739,000
TBA Contracts [Member]
Adjustments to reconcile net income (loss) to net cash (used in) provided by operating activities:
Derivative, Gain (Loss) on Derivative, Net	1,813,000	3,846,000
US Treasury Securities [Member]
Adjustments to reconcile net income (loss) to net cash (used in) provided by operating activities:
Derivative, Gain (Loss) on Derivative, Net	$ 95,000	$ 0