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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 | 9 Months Ended | ||
|---|---|---|---|---|
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Sep. 30, 2014
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Sep. 30, 2013
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Sep. 30, 2014
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Sep. 30, 2013
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| Derivative Instruments, Gain (Loss) [Line Items] | ||||
| Gain (Loss) on Interest Rate Derivative Instruments Not Designated as Hedging Instruments | $ 28,519 | $ (55,410) | $ (193,028) | $ 223,388 |
| Derivative Instruments, Gain (Loss) Recognized in Income, Net | 6,056 | 20,434 | (12,345) | 66,055 |
| Gain (Loss) on Interest Rate Swap and Swaption Agreements | (81,805) | 293,783 | ||
| Gain (Loss) on Mortgage Loans Held-for-Sale | (2,387) | (4,443) | 6,233 | (25,262) |
| Trading Activity, Gains and Losses, Net | 33,129 | (34,976) | (203,073) | 269,428 |
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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 | 10,322 | (4,701) | 668 |
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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 | 7,567 | 5,686 | 41,942 | (33,234) |
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Forward Purchase Commitments [Member]
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| Derivative Instruments, Gain (Loss) [Line Items] | ||||
| Gain (Loss) on Mortgage Loans Held-for-Sale | (1,446) | 0 | 2,300 | (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 | 1,031 | 71,751 | (46,749) | 138,429 |
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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 | (3,825) | (37,052) | (10,144) | 15,375 |
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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 | 1,306 | 71 | 6,734 | (13,986) |
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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 | 0 | 0 | (8) | (991) |
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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 | (22,827) | 3,711 | (192,635) | 95,476 |
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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 | 48 | 0 | (1,324) | 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 | (2,749) | 7,852 | 104,193 | 7,852 |
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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 | 21,288 | (8,691) | (38,473) | (8,371) |
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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 | 32,807 | (58,282) | (66,113) | 128,431 |
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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 | $ (71) | $ (30,344) | $ 1,905 | $ (40,206) |