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Real Estate Securities Schedule of Real Estate Securities (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013		Dec. 31, 2012
Real Estate-Related Securities [Line Items]
Amortized Cost	$ 12,099		$ 13,490
Fair Value	12,360		13,596
Non-Agency RMBS [Member]
Real Estate-Related Securities [Line Items]
Current Principal	20,252		26,890
Unamortized Premium (Discount)	(8,153)		(13,400)
Amortized Cost	12,099		13,490
Gross Unrealized Gain	536		117
Gross Unrealized Losses	(275)		(11)
Fair Value	$ 12,360		$ 13,596
Weighted Average Coupon	2.90%		2.20%
Weighted Average Yield	7.90%		8.50%
Weighted Average Life (Years)	6 years 15 days	[1]	7 years 292 days	[1]
[1] Actual maturities of MBS are generally shorter than stated contractual maturities. Maturities are affected by the contractual lives of the underlying mortgages, periodic payments of principal and prepayments of principal.

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The amount of debt discount (net of debt premium) that was originally recognized at the issuance of the instrument that has yet to be amortized.

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The fair value as of the balance sheet date of firm holdings in mortgages, mortgage backed securities (investment instruments that represent ownership of an undivided interest in a group of mortgages, where principal and interest from the individual mortgages are used to pay investors' principal and interest on the mortgage backed security) and asset-backed securities that are primarily paid from the cash flows of a discrete pool of receivables or other financial assets (such as credit-card receivables), either fixed or revolving, that by their terms convert into cash within a finite time period. Includes both pledged (to counterparties as collateral for financing transactions) and unpledged holdings.

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