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Agency MBS (Details) (Agency MBS [Member], USD $) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2012 | Jun. 30, 2011 | Jun. 30, 2012 | Jun. 30, 2011 | Dec. 31, 2011
Principal/par value | $ 2,503,339,000 |  |  | $ 2,503,339,000 |  |  | $ 1,755,349,000 |
Unamortized premium | 438,286,000 |  |  | 438,286,000 |  |  | 193,473,000 |
Unamortized discount | (15,000) |  |  | (15,000) |  |  | (17,000) |
Amortized cost | 2,941,610,000 |  |  | 2,941,610,000 |  |  | 1,948,805,000 |
Available for sale securities, gross unrealized gains | 42,348,000 |  |  | 42,348,000 |  |  | 22,883,000 |
Available for sale securities, gross unrealized losses | (7,235,000) |  |  | (7,235,000) |  |  | (8,448,000) |
Trading securities gross unrealized gains | 2,316,000 |  |  | 2,316,000 |  |  | 1,919,000 |
Total MBS investments at fair value | 2,979,039,000 |  |  | 2,979,039,000 |  |  | 1,965,159,000 |
Weighted average coupon, MBS | 4.02% |  |  | 4.02% |  |  | 4.64% |
RMBS [Member] |  |  |  |  |  |  |  |
Principal/par value | 2,216,357,000 |  |  | 2,216,357,000 |  |  | 1,488,397,000 |
Unamortized premium | 120,828,000 |  |  | 120,828,000 |  |  | 85,488,000 |
Unamortized discount | (15,000) |  |  | (15,000) |  |  | (17,000) |
Amortized cost | 2,337,170,000 |  |  | 2,337,170,000 |  |  | 1,573,868,000 |
Available for sale securities, gross unrealized gains | 19,409,000 |  |  | 19,409,000 |  |  | 10,787,000 |
Available for sale securities, gross unrealized losses | (6,175,000) |  |  | (6,175,000) |  |  | (7,405,000) |
Trading securities gross unrealized gains | 0 |  |  | 0 |  |  | 0 |
Total MBS investments at fair value | 2,350,404,000 |  |  | 2,350,404,000 |  |  | 1,577,250,000 |
Weighted average coupon, MBS | 3.87% |  |  | 3.87% |  |  | 4.54% |
Payments to Acquire Mortgage Backed Securities (MBS) |  |  |  | 1,020,900,000 |  |  |  |
CMBS [Member] |  |  |  |  |  |  |  |
Principal/par value | 286,982,000 |  |  | 286,982,000 |  |  | 266,952,000 |
Unamortized premium | 22,412,000 |  |  | 22,412,000 |  |  | 21,627,000 |
Unamortized discount | 0 |  |  | 0 |  |  | 0 |
Amortized cost | 309,394,000 |  |  | 309,394,000 |  |  | 288,579,000 |
Available for sale securities, gross unrealized gains | 17,047,000 |  |  | 17,047,000 |  |  | 11,746,000 |
Available for sale securities, gross unrealized losses | 0 |  |  | 0 |  |  | 0 |
Trading securities gross unrealized gains | 2,316,000 |  |  | 2,316,000 |  |  | 1,919,000 |
Total MBS investments at fair value | 328,757,000 |  |  | 328,757,000 |  |  | 302,244,000 |
Weighted average coupon, MBS | 5.19% |  |  | 5.19% |  |  | 5.20% |
Payments to Acquire Mortgage Backed Securities (MBS) |  |  |  | 247,481,000 |  |  |  |
Trading Securities, Cost | 27,833,000 |  |  | 27,833,000 |  |  | 28,119,000 |
Trading Securities, Change in Unrealized Holding Gain (Loss) | 569,000 |  | 956,000 | 433,000 |  | 1,075,000 |  |
CMBS - IO [Member] |  |  |  |  |  |  |  |
Principal/par value | 0 | [1] |  | 0 | [1] |  | 0 | [2]
Unamortized premium | 295,046,000 | [1] |  | 295,046,000 | [1] |  | 86,358,000 | [2]
Unamortized discount | 0 | [1] |  | 0 | [1] |  | 0 | [2]
Amortized cost | 295,046,000 | [1] |  | 295,046,000 | [1] |  | 86,358,000 | [2]
Available for sale securities, gross unrealized gains | 5,892,000 | [1] |  | 5,892,000 | [1] |  | 350,000 | [2]
Available for sale securities, gross unrealized losses | (1,060,000) | [1] |  | (1,060,000) | [1] |  | (1,043,000) | [2]
Trading securities gross unrealized gains | 0 | [1] |  | 0 | [1] |  | 0 | [2]
Total MBS investments at fair value | 299,878,000 | [1] |  | 299,878,000 | [1] |  | 85,665,000 | [2]
Weighted average coupon, MBS | 1.17% | [1] |  | 1.17% | [1] |  | 0.96% | [2]
Notional balance of Agency IO investments | $ 4,543,349,000 |  |  | $ 4,543,349,000 |  |  | $ 1,813,096,000 |
[1] | The combined notional balance for the Agency CMBS IO securities is $4,543,349 as of June 30, 2012.
[2] | The combined notional balance for the Agency CMBS IO securities is $1,813,096 as of December 31, 2011,

X
- Definition This item represents the cost of Agency MBS, which are categorized as either available-for-sale or trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impariments recognized in earnings, if any. + References No definition available. + Details
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- Definition The remaining amount of investment discount originally recognized at the date of purchase of the instrument that has yet to be accreted. + References No definition available. + Details
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- Definition The remaining amount of investment premium originally recognized at the purchase date of the instrument that has yet to be amortized. + References No definition available. + Details
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- Definition This item represents the current weighted-average gross interest rate earned on this type of MBS in the investment portfolio as of the period indicated. The gross interest rate of each MBS within the portfolio is weighted based on its current outstanding notional or par balance. The current outstanding notional or par balance for each MBS consists of the total of all principal balances remaining on the mortgage loans underlying each MBS. + References No definition available. + Details
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