Revision of Previously Issued Financial Statements for Errors Affecting Certain Items Presented in the Statements of Operations and Statements of Cash Flows (Details 2) (USD $) In Thousands, unless otherwise specified	1 Months Ended	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2013
Statement of Cash Flows (effect on individual line items)
Net income (loss)	$ 4,261	$ (56,153)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Premium amortization and (discount accretion), net	1,567	14,199
Unrealized loss (gain) on Residential mortgage-backed securities and other securities, net	(2,983)	211,045
Mark-to-market adjustments on derivative instruments	5,269	(90,303)
Other loss on Residential mortgage-backed securities	87	5,801
Realized loss (gain) on sale of Residential mortgage-backed securities and other securities, net	(1,157)	17,743
All other Items	(5,735)
Net cash provided by operating activities	1,309	93,620
Cash flows from investing activities:
Principal payments and basis recovered on Residential mortgage-backed securities	8,399	156,970
All other items	(1,921,286)
Net cash provided by (used in) investing activities	(1,912,887)	785,751
Cash flows from financing activities:
All items	1,938,358
Net cash provided by (used in) financing activities	1,938,358	(926,947)
Net increase (decrease) in cash and cash equivalents	26,780	(47,576)
Cash and cash equivalents beginning of period	1	56,292
Cash and cash equivalents end of period	26,781	8,716
As Originally Reported
Statement of Cash Flows (effect on individual line items)
Net income (loss)	4,261
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Premium amortization and (discount accretion), net	2,198
Unrealized loss (gain) on Residential mortgage-backed securities and other securities, net	(3,925)
Mark-to-market adjustments on derivative instruments	5,409
Other loss on Residential mortgage-backed securities	605
Realized loss (gain) on sale of Residential mortgage-backed securities and other securities, net	(1,120)
All other Items	(5,735)
Net cash provided by operating activities	1,693
Cash flows from investing activities:
Principal payments and basis recovered on Residential mortgage-backed securities	8,015
All other items	(1,921,286)
Net cash provided by (used in) investing activities	(1,913,271)
Cash flows from financing activities:
All items	1,938,358
Net cash provided by (used in) financing activities	1,938,358
Net increase (decrease) in cash and cash equivalents	26,780
Cash and cash equivalents beginning of period	1
Cash and cash equivalents end of period	26,781
Adjustments
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Premium amortization and (discount accretion), net	(631)
Unrealized loss (gain) on Residential mortgage-backed securities and other securities, net	942
Mark-to-market adjustments on derivative instruments	(140)
Other loss on Residential mortgage-backed securities	(518)
Realized loss (gain) on sale of Residential mortgage-backed securities and other securities, net	(37)
Net cash provided by operating activities	(384)
Cash flows from investing activities:
Principal payments and basis recovered on Residential mortgage-backed securities	384
Net cash provided by (used in) investing activities	$ 384