Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
CASH FLOWS FROM OPERATING ACTIVITIES
Net income (loss)	$ 1,071,000	$ 24,519,000	$ (698,000)
Adjustments to reconcile net income (loss) to net cash (used in) provided by operating activities:
Stock based compensation and equity plan amortization	431,000	142,000	0
Realized and unrealized (gains) losses on mortgage-backed securities	29,685,000	(14,159,000)	11,931,000
Realized and unrealized loss on interest rate swaption	1,648,000	4,439,000	0
Gains On TBA Securities	(386,000)	0	0
Changes in operating assets and liabilities
Accrued interest receivable	(2,279,000)	(4,652,000)	(1,119,000)
Other assets	(19,000)	(105,000)	(119,000)
Accrued interest payable	235,000	536,000	37,000
Other liabilities	184,000	678,000	(60,000)
Due to affiliates	135,000	248,000	127,000
NET CASH (USED IN) PROVIDED BY OPERATING ACTIVITIES	30,705,000	11,646,000	10,099,000
From mortgage-backed securities investments
Purchases	(2,687,031,000)	(2,192,282,000)	(687,584,000)
Sales	1,832,194,000	928,009,000	408,982,000
Principal repayments	215,658,000	80,486,000	30,778,000
PaymentsToAcquireFederalHomeLoanBankStock	3,753,000	0	0
Increase in restricted cash	(4,940,000)	(5,344,000)	(1,997,000)
Proceeds From Net TBA Settlements	386,000	0	0
Purchase of interest rate swaptions, net of margin cash received	2,464,000	4,292,000	0
NET CASH USED IN INVESTING ACTIVITIES	(649,950,000)	(1,193,423,000)	(249,821,000)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from repurchase agreements	18,867,303,000	7,663,332,000	3,319,670,000
Principal payments on repurchase agreements	(18,505,141,000)	(6,545,239,000)	(3,105,054,000)
ProceedsFromFederalHomeLoanBankBorrowings	187,500,000	0	0
Cash dividends	(38,748,000)	(22,643,000)	(4,662,000)
Stock Issued During Period, Value, New Issues	(83,275,000)	(171,295,000)	(35,400,000)
Common stock repurchases	(10,852,000)	0	0
NET CASH PROVIDED BY FINANCING ACTIVITIES	583,337,000	1,266,745,000	245,354,000
NET INCREASE IN CASH AND CASH EQUIVALENTS	(35,908,000)	84,968,000	5,632,000
CASH AND CASH EQUIVALENTS, beginning of the period	93,137,000	8,169,000
CASH AND CASH EQUIVALENTS, end of the period	57,229,000	93,137,000	8,169,000
Cash paid during the period for:
Interest	7,036,000	2,495,000	1,089,000
SUPPLEMENTAL DISCLOSURES OF NONCASH FINANCING ACTIVITIES:
Dividends paid in shares of Class A Common Stock	$ 0	$ 0	$ 8,000