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Schedule of Derivative Instruments, Gain (Loss) in Statement of Financial Performance (Details) (USD $)
In Thousands, unless otherwise specified |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
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Jun. 30, 2014
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Jun. 30, 2013
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Jun. 30, 2014
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Jun. 30, 2013
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| Derivative Instruments, Gain (Loss) [Line Items] | ||||
| Gain (Loss) on Interest Rate Derivative Instruments Not Designated as Hedging Instruments | $ (116,019) | $ 259,826 | $ (221,547) | $ 278,798 |
| Derivative Instruments, Gain (Loss) Recognized in Income, Net | (24,202) | 62,283 | (18,401) | 45,621 |
| Gain (Loss) on Interest Rate Swap and Swaption Agreements | (182,420) | 374,884 | ||
| Gain (Loss) on Mortgage Loans Held-for-Sale | 11,801 | (35,142) | 8,620 | (20,819) |
| Trading Activity, Gains and Losses, Net | (136,058) | 301,807 | (236,202) | 304,404 |
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Agency To-be-Announced Securities, Non-Risk Management [Member]
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| Derivative Instruments, Gain (Loss) [Line Items] | ||||
| Derivative Instruments, Gain (Loss) Recognized in Income, Net | 0 | (10,057) | (4,701) | (9,654) |
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Inverse Interest-Only Securities [Member]
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| Derivative Instruments, Gain (Loss) [Line Items] | ||||
| Derivative Instruments, Gain (Loss) Recognized in Income, Net | 16,052 | (40,149) | 34,375 | (38,920) |
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Forward Purchase Commitment [Member]
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| Derivative Instruments, Gain (Loss) [Line Items] | ||||
| Gain (Loss) on Mortgage Loans Held-for-Sale | 4,163 | (20,302) | 3,746 | (20,015) |
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Interest Rate Risk Associated with the Investment Portfolio [Member] | Forward Contracts [Member]
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| Derivative Instruments, Gain (Loss) [Line Items] | ||||
| Derivative Instruments, Gain (Loss) Recognized in Income, Net | (29,877) | 79,330 | (47,780) | 66,678 |
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Interest Rate Risk Associated with the Investment Portfolio [Member] | Options Held [Member]
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| Derivative Instruments, Gain (Loss) [Line Items] | ||||
| Derivative Instruments, Gain (Loss) Recognized in Income, Net | (4,614) | 52,426 | (6,319) | 52,426 |
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Interest Rate Risk Associated with the Investment Portfolio [Member] | Swap [Member]
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| Derivative Instruments, Gain (Loss) [Line Items] | ||||
| Derivative Instruments, Gain (Loss) Recognized in Income, Net | (6,103) | (14,057) | 5,428 | (14,057) |
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Interest Rate Risk Associated with the Investment Portfolio [Member] | Short US Treasury Securities [Member]
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| Derivative Instruments, Gain (Loss) [Line Items] | ||||
| Derivative Instruments, Gain (Loss) Recognized in Income, Net | (8) | (990) | (8) | (990) |
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Interest Rate Risk Associated with the Investment Portfolio [Member] | Interest Rate Swaption [Member]
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| Derivative Instruments, Gain (Loss) [Line Items] | ||||
| Gain (Loss) on Interest Rate Derivative Instruments Not Designated as Hedging Instruments | (57,250) | 73,794 | (169,808) | 91,765 |
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Interest Rate Risk Associated with the Investment Portfolio [Member] | Total Return Swap [Member]
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| Derivative Instruments, Gain (Loss) [Line Items] | ||||
| Derivative Instruments, Gain (Loss) Recognized in Income, Net | 353 | 0 | (1,372) | 0 |
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Interest Rate Risk Associated with the Investment Portfolio [Member] | Short [Member] | Interest Rate Swap [Member]
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| Derivative Instruments, Gain (Loss) [Line Items] | ||||
| Gain (Loss) on Interest Rate Derivative Instruments Not Designated as Hedging Instruments | 65,963 | 0 | 106,942 | 0 |
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Interest Rate Risk Associated with the Investment Portfolio [Member] | Long [Member] | Interest Rate Swap [Member]
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| Derivative Instruments, Gain (Loss) [Line Items] | ||||
| Gain (Loss) on Interest Rate Derivative Instruments Not Designated as Hedging Instruments | (46,341) | 409 | (59,761) | 320 |
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Interest Rate Risk Associated with Borrowings [Member] | Long [Member] | Interest Rate Swap [Member]
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| Derivative Instruments, Gain (Loss) [Line Items] | ||||
| Gain (Loss) on Interest Rate Derivative Instruments Not Designated as Hedging Instruments | (78,391) | 185,623 | (98,920) | 186,713 |
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Credit Risk Associated with Non-Agency RMBS and Mortgage Loans Held-for-Sale [Member] | Credit Default Swap, Selling Protection [Member]
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| Derivative Instruments, Gain (Loss) [Line Items] | ||||
| Derivative Instruments, Gain (Loss) Recognized in Income, Net | $ (5) | $ (4,220) | $ 1,976 | $ (9,862) |