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Derivative Instruments and Hedging Activities Schedule of Derivative Instruments in Statement of Financial Position, Fair Value (Details) (USD $)
In Thousands, unless otherwise specified |
Dec. 31, 2011
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Dec. 31, 2010
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Derivative Financial Instruments, Assets [Member]
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| Derivatives, Fair Value [Line Items] | ||
| Derivative Asset, Fair Value, Net | $ 251,856 | $ 38,109 |
| Derivative Asset, Notional Amount | 4,855,985 | 361,035 |
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Derivative Financial Instruments, Liabilities [Member]
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| Derivatives, Fair Value [Line Items] | ||
| Derivative Liability, Fair Value, Net | (49,080) | (158) |
| Derivative Liability, Notional Amount | 6,814,812 | 850,000 |
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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 | 157,421 | 30,944 |
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Inverse Interest-Only Securities [Member] | Derivative Financial Instruments, Liabilities [Member]
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| Derivatives, Fair Value [Line Items] | ||
| Derivative Liability, Fair Value, Net | 0 | |
| Derivative Liability, Notional Amount | 0 | |
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Interest Rate Swap [Member] | Derivative Financial Instruments, Assets [Member]
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| Derivatives, Fair Value [Line Items] | ||
| Derivative Asset, Fair Value, Net | 0 | |
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Interest Rate Swaption [Member] | Derivative Financial Instruments, Assets [Member]
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| Derivatives, Fair Value [Line Items] | ||
| Derivative Asset, Fair Value, Net | 4,028 | |
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Interest Rate Swaption [Member] | Derivative Financial Instruments, Liabilities [Member]
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| Derivatives, Fair Value [Line Items] | ||
| Derivative Liability, Fair Value, Net | 0 | |
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Other Contract [Member] | Derivative Financial Instruments, Assets [Member]
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| Derivatives, Fair Value [Line Items] | ||
| Derivative Asset, Fair Value, Net | 2,664 | |
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Forward Sale Commitment [Member] | Derivative Financial Instruments, Assets [Member]
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| Derivatives, Fair Value [Line Items] | ||
| Derivative Asset, Fair Value, Net | $ 0 |
| 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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- Definition
Total monetary amount specified by the derivative asset(s). Expressed as an absolute value. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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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 liability or group of derivative liabilities. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Total monetary amount specified by the derivative liability (or liabilities). Expressed as an absolute value. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Details
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