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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 |
Sep. 30, 2012
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Dec. 31, 2011
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|---|---|---|
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Derivative Financial Instruments, Assets [Member]
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| Derivatives, Fair Value [Line Items] | ||
| Derivative Asset, Fair Value, Net | $ 496,788 | $ 251,856 |
| Derivative Asset, Notional Amount | 8,562,259 | 4,855,985 |
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Derivative Financial Instruments, Liabilities [Member]
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| Derivatives, Fair Value [Line Items] | ||
| Derivative Liability, Fair Value, Net | (132,322) | (49,080) |
| Derivative Liability, Notional Amount | 13,095,000 | 6,814,812 |
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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 | 332,569 | 157,421 |
| Derivative Asset, Notional Amount | 2,031,621 | 1,131,084 |
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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 | 0 |
| Derivative Liability, Notional Amount | 0 | 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 | 0 |
| Derivative Asset, Notional Amount | 0 | 0 |
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Interest Rate Swap [Member] | Derivative Financial Instruments, Liabilities [Member]
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| Derivatives, Fair Value [Line Items] | ||
| Derivative Liability, Fair Value, Net | (132,322) | (28,790) |
| Derivative Liability, Notional Amount | 13,095,000 | 5,810,000 |
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Credit Default Swap [Member] | Derivative Financial Instruments, Assets [Member]
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| Derivatives, Fair Value [Line Items] | ||
| Derivative Asset, Fair Value, Net | 54,584 | 86,136 |
| Derivative Asset, Notional Amount | 610,707 | 544,699 |
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Credit Default Swap [Member] | Derivative Financial Instruments, Liabilities [Member]
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| Derivatives, Fair Value [Line Items] | ||
| Derivative Liability, Fair Value, Net | 0 | (14,638) |
| Derivative Liability, Notional Amount | 0 | 154,812 |
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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 | 105,064 | 5,635 |
| Derivative Asset, Notional Amount | 5,150,000 | 2,900,000 |
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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 | 0 |
| Derivative Liability, Notional Amount | 0 | 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 | 3,967 | 2,664 |
| Derivative Asset, Notional Amount | 450,000 | 275,000 |
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Other Contract [Member] | Derivative Financial Instruments, Liabilities [Member]
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| Derivatives, Fair Value [Line Items] | ||
| Derivative Liability, Fair Value, Net | 0 | (5,652) |
| Derivative Liability, Notional Amount | 0 | 850,000 |
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Forward Purchase Commitment [Member]
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| Derivatives, Fair Value [Line Items] | ||
| Derivative Asset, Fair Value, Net | 604 | |
| Derivative Asset, Notional Amount | 319,931 | |
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Forward Purchase Commitment [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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Forward Sale Commitment [Member]
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| Derivatives, Fair Value [Line Items] | ||
| Derivative Asset, Notional Amount | 5,202 | |
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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 | |
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Forward Sale Commitment [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 |