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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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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6475986&loc=d3e42546-110969 + Details
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