Consolidated Statements of Cash Flows - USD ($)	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
CASH FLOWS FROM OPERATING ACTIVITIES
Net income (loss)	$ (7,193,000)	$ 1,872,000
Adjustments to reconcile net income (loss) to net cash (used in) provided by operating activities:
Stock based compensation and equity plan amortization	359,000	386,000
Realized and unrealized (gains) losses on mortgage-backed securities	29,463,000	(12,302,000)
Realized and unrealized loss on interest rate swaption	0	(36,000)
Unrealized (gains) losses on interest rate swaps	(3,689,000)	(5,561,000)
Gains On TBA Securities	2,384,000	1,911,000
Changes in operating assets and liabilities
Accrued interest receivable	(2,491,000)	(203,000)
Other assets	(212,000)	(213,000)
Accrued interest payable	342,000	549,000
Other liabilities	(2,563,000)	(321,000)
Due to affiliates	124,000	(21,000)
NET CASH (USED IN) PROVIDED BY OPERATING ACTIVITIES	23,902,000	(2,817,000)
From mortgage-backed securities investments
Purchases	(3,692,066,000)	(1,485,258,000)
Sales	3,064,979,000	1,327,500,000
Principal repayments	155,303,000	109,412,000
Proceeds From Sale Of Federal Home Loan Bank Stock	3,000	3,750,000
Proceeds From Net TBA Settlements	(5,591,000)	(1,598,000)
Purchase of interest rate swaptions, net of margin cash received	0	(704,000)
NET CASH USED IN INVESTING ACTIVITIES	(477,372,000)	(45,490,000)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from repurchase agreements	25,243,560,000	14,290,130,000
Principal payments on repurchase agreements	(24,758,809,000)	(14,028,116,000)
Payments For Federal Home Loan Bank Advances	0	187,500,000
Cash dividends	(28,902,000)	(18,421,000)
Proceeds From Issuance Of Common Stock	122,857,000	6,591,000
NET CASH PROVIDED BY FINANCING ACTIVITIES	578,706,000	62,684,000
NET INCREASE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH	125,236,000	14,377,000
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, beginning of period	94,425,000	69,959,000
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, end of period	219,661,000	84,336,000
Cash paid during the period for:
Interest	15,136,000	6,100,000
SUPPLEMENTAL DISCLOSURES OF NONCASH FINANCING ACTIVITIES:
Securities acquired settled in later period	$ 273,689,000	$ 4,276,000