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Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments.

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Amount of settlements of financial instrument classified as a derivative asset (liability) after deduction of derivative liability, measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Aggregate net gain and losses (whether realized or unrealized) on all derivative instruments held for trading purposes whether or not settled physically.

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Aggregate net gain (loss) on all derivative instruments recognized in earnings during the period, before tax effects.

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The net gain (loss) recognized in earnings during the period due to the ineffectiveness on interest rate fair value hedges.

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Amount of unrealized gain (loss) related to the fair value of interest rate derivatives designated as fair value hedging instruments, as offset by the gain (loss) on the hedged item to the extent that the fair value hedge is determined to be effective.

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The Components of Loss on Derivative Instruments Net (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013
Derivative Instruments Gain Loss [Line Items]
Net realized and unrealized gains (losses) on TBA dollar rolls	$ (79,988)	$ 35,430	$ (55,260)	$ (41,615)	$ 2,205	$ (77,456)	$ 5,485	$ 51	$ (141,433)	$ (69,715)
Loss on derivative instruments, net									(141,433)	(69,715)
Interest Rate Swap
Derivative Instruments Gain Loss [Line Items]
Fair value adjustments									73,729	25,036
Monthly net settlements									(113,919)	(30,985)
Interest Rate Swaptions
Derivative Instruments Gain Loss [Line Items]
Fair value adjustments									(15,520)
Futures Contracts
Derivative Instruments Gain Loss [Line Items]
Fair value adjustments									(176,916)	(25,585)
Realized losses									(29,423)	(33,298)
Mortgage Loan Purchase Commitments
Derivative Instruments Gain Loss [Line Items]
Fair value adjustments									(2)
TBA Dollar Roll
Derivative Instruments Gain Loss [Line Items]
TBA dollar roll income									92,008	5,605
Net realized and unrealized gains (losses) on TBA dollar rolls									$ 28,610	$ (10,488)