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Derivative Instruments and Hedging Activities Schedule of Inverse Interest-Only Securities Reconciliation (Details) (USD $)
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Mar. 31, 2012
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Dec. 31, 2011
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| Derivatives, Fair Value [Line Items] | ||
| Inverse Interest-only Securities, Accrued Interest | $ 3,100,000 | |
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Not Designated as Hedging Instrument [Member]
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| Derivatives, Fair Value [Line Items] | ||
| Notional Amount of Derivatives | 1,666,707,000 | 1,131,084,000 |
| Derivative, Unamortized Premium | 0 | 0 |
| Derivative, Designated Credit Reserve | 0 | 0 |
| Derivative, Net, Unamortized | (1,424,110,000) | (973,066,000) |
| Derivative, Amortized Cost Basis | 242,597,000 | 158,018,000 |
| Derivative, Gross Unrealized Gains | 9,475,000 | 4,606,000 |
| Derivative, Gross Unrealized Losses | (9,127,000) | (7,385,000) |
| Derivative, Carrying Value | 242,945,000 | 155,239,000 |
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Derivative Financial Instruments, Assets [Member]
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| Derivatives, Fair Value [Line Items] | ||
| Derivative Asset, Fair Value, Net | 340,715,000 | 251,856,000 |
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Inverse Interest-Only Securities [Member] | Derivative Financial Instruments, Assets [Member]
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| Derivatives, Fair Value [Line Items] | ||
| Derivative Asset, Fair Value, Net | $ 246,066,000 | $ 157,421,000 |
| X | ||||||||||
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- Definition
This item represents the cost of inverse interest-only residential mortgage securities (Agency derivatives), net of adjustments including accretion, amortization, and fair value hedge accounting adjustments, if any. No definition available.
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| X | ||||||||||
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- Definition
Carrying value (excluding accrued interest receivable) as of the balance sheet date of the assets less the liabilities of a derivative or group of derivatives. No definition available.
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| X | ||||||||||
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- Definition
This item represents the amount of unamortized discount on inverse interest-only residential mortgage securities (Agency derivatives) designated as credit reserve on the securities. No definition available.
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| X | ||||||||||
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- Definition
This item represents the gross unrealized gains for inverse interest-only residential mortgage securities (Agency derivatives), at a point in time. No definition available.
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| X | ||||||||||
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- Definition
This item represents the gross unrealized losses for inverse interest-only residential mortgage securities (Agency derivatives), at a point in time. No definition available.
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| X | ||||||||||
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- Definition
This item represents the amount of unamortized discount on inverse interest-only residential mortgage securities (Agency derivatives) not designated as a credit reserve on the securities. No definition available.
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| X | ||||||||||
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- Definition
This item represents the amount of unamortized premium on inverse interest-only residential mortgage securities (Agency derivatives). No definition available.
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| X | ||||||||||
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- Definition
Carrying amount as of the balance sheet date of interest earned but not received on Inverse interest-only residential mortgage securities (Agency derivatives), which are considered derivative contracts under ASC 815 that are not for purposes of hedging. No definition available.
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| X | ||||||||||
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- Definition
Fair value as of the balance sheet date of the gross assets less the gross liabilities of a derivative asset or group of derivative assets. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
Aggregate notional amount of all derivatives. The notional amount relates to a number of currency units, shares, bushels, pounds, or other units specified in a derivative instrument. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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