Consolidated Statements of Cash Flows - USD ($)	8 Months Ended	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2014	Dec. 31, 2013
Cash flows from operating activities:
Net income (loss)	$ 4,819,306	$ 3,313,786	$ 3,226,430
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Amortization/accretion of available-for-sale securities premiums and discounts, net	(347,647)	(4,705,639)	(1,974,765)
Realized loss on sale of investments, net	98,382	3,877,356	33,931,298
Unrealized (gain) loss on Linked Transactions, net	(3,932,369)	1,966,726	(2,364,354)
Realized (gain) loss on derivative contracts	37,333	18,214,460	(18,812,854)
Unrealized loss on derivative contracts	298,359	2,931,249	(878,100)
Realized loss on mortgage loans held-for-sale	0	776,971	0
Unrealized (gain) on mortgage loans held-for-sale	0	(329,728)	0
Unrealized (gain) on on multi-family loans held in securitization trusts	0	(1,473,485)	0
Unrealized (gain) on on residential loans held in securitization trusts	0	(3,059,647)	0
Restricted stock compensation expense	0	13,457	125,923
Net change in:
Accrued interest receivable	(189,364)	(1,874,785)	(855,827)
Deferred offering costs	0	187,457	0
Other assets	0	(5,052)	(66,547)
Accrued interest payable	65,820	501,584	208,795
Fees and expenses payable to Manager	32,721	732,000	297,279
Other accounts payable and accrued expenses	4,990	(322,485)	490,650
Net cash provided by operating activities	887,531	20,744,225	13,327,928
Cash flows from investing activities:
Purchase of available-for-sale securities	(81,162,110)	(521,681,124)	(1,123,204,838)
Purchase of mortgage loans held-for-sale	0	(451,629,615)	678,640,520
Proceeds from mortgage loans held-for-sale	0	388,053,342	0
Proceeds from sales of available-for-sale securities	0	296,246,293	0
Net proceeds of (payment for) derivative contracts	(64,000)	(17,878,460)	18,419,521
Principal payments from available-for-sale securities	2,817,375	45,077,314	35,121,878
Principal payments from mortgage loans held-for-sale	0	8,450,648	0
Investment related receivable	0	506,892	(506,892)
Restricted cash	(1,933,390)	1,942,528	(11,409,783)
Net cash used in investing activities	(80,342,125)	(250,912,182)	(402,939,594)
Cash flows from financing activities:
Net proceeds from issuance of common stock	26,177,089	79,263,318	84,000,000
Net proceeds from issuance of preferred stock	0	19,096,074	18,070,938
Redemption of preferred stock	0	0	(110,000)
Change in deferred offering costs	(915,512)	(1,133,118)	1,037,386
Dividends paid on common stock	(940,839)	(18,229,875)	(10,303,705)
Dividends paid on preferred stock	0	(2,890,665)	(2,326)
Proceeds from repurchase agreements - available-for-sale securities	392,314,000	4,528,080,286	4,116,258,000
Proceeds from repurchase agreements - mortgage loans held-for-sale	0	401,295,517	0
Principal repayments of repurchase agreements - available-for-sale securities	(328,891,000)	(4,395,638,286)	(3,767,509,000)
Principal repayments of repurchase agreements - mortgage loans held-for-sale	0	(351,031,665)	0
Net cash received (paid) on securities underlying Linked Transactions	(18,669,385)	(117,544,275)	(69,567,455)
Net cash received from repurchase agreements underlying Linked Transactions	13,989,000	88,112,000	47,192,000
Net cash provided by financing activities	83,063,353	229,379,311	419,065,838
Net increase (decrease) in cash and cash equivalents	3,608,759	(788,646)	29,454,172
Cash and cash equivalents, beginning of period	0	33,062,931	3,608,759
Cash and cash equivalents, end of period	3,608,759	32,274,285	33,062,931
Supplemental disclosure of cash flow information
Cash paid for interest	201,260	4,363,706	4,528,172
Non-cash investing and financing activities information
Restricted stock compensation expense	0	13,457	125,923
Dividends declared but not paid at end of period	220,833	39,132	42,501
Net change in unrealized gain (loss) on available-for-sale securities	2,433,997	18,303,304	(13,528,951)
Consolidation of multi-family loans held in securitization trusts	0	1,677,847,006	0
Consolidation of residential loans held in securitization trusts	0	507,423,695	0
Consolidation of multi-family securitized debt obligations	0	1,676,373,521	0
Consolidation of residential securitized debt obligations	$ 0	$ 433,698,636	$ 0