Revision of Previously Issued Financial Statements for Errors Affecting Certain Items Presented in the Statements of Operations and Statements of Cash Flows (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	1 Months Ended	3 Months Ended	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2013
Net interest income:
Interest income	$ 7,083	$ 32,742	$ 66,492
Interest expense	725	4,522	9,703
Net Interest Income	6,358	28,220	56,789
Other Income (Loss):
Interest income on cash balances		12	45
Realized gain on sale of residential mortgage-backed securities, net	1,157	(6,083)	(17,743)
Other loss on residential mortgage-backed securities	(87)	(3,533)	(5,801)
Unrealized gain on residential mortgage-backed securities, net	2,983	(156,286)	(211,045)
Loss on derivative instruments net	(5,159)	109,474	124,314
Other Income (Loss), net	(1,106)	(52,507)	(105,725)
Operating Expenses:
General and administrative	584	1,541	3,278
Management fee - related party	407	1,826	3,939
Total Operating Expenses	991	3,367	7,217
Net income (loss) to Common Stock and participating securities	4,261	(27,654)	(56,153)
Net income attributable to common and participating shareholders (basic) (in dollars per share)	$ 0.41	$ (1.14)	$ (2.32)
Net income attributable to shareholders (diluted) (in dollars per share)	$ 0.41	$ (1.14)	$ (2.32)
As Originally Reported
Net interest income:
Interest income	6,850
Interest expense	725
Net Interest Income	6,125
Other Income (Loss):
Realized gain on sale of residential mortgage-backed securities, net	1,120
Other loss on residential mortgage-backed securities	(605)
Unrealized gain on residential mortgage-backed securities, net	3,925
Loss on derivative instruments net	(5,313)
Other Income (Loss), net	(873)
Operating Expenses:
General and administrative	584
Management fee - related party	407
Total Operating Expenses	991
Net income (loss) to Common Stock and participating securities	4,261
Net income attributable to common and participating shareholders (basic) (in dollars per share)	$ 0.41
Net income attributable to shareholders (diluted) (in dollars per share)	$ 0.41
Adjustments
Net interest income:
Interest income	233
Net Interest Income	233
Other Income (Loss):
Realized gain on sale of residential mortgage-backed securities, net	37
Other loss on residential mortgage-backed securities	518
Unrealized gain on residential mortgage-backed securities, net	(942)
Loss on derivative instruments net	154
Other Income (Loss), net	$ (233)