|
Derivative Instruments and Hedging Activities Schedule of Interest Rate Swaps Associated with U.S. Treasuries and Other RMBS (Details) (USD $)
In Thousands, unless otherwise specified |
Mar. 31, 2013
|
Dec. 31, 2012
|
|---|---|---|
| Derivative [Line Items] | ||
| Trading securities, at fair value | $ 1,002,414 | $ 1,002,062 |
|
Interest Rate Swaps Associated with U.S. Treasuries and Other RMBS [Member]
|
||
| Derivative [Line Items] | ||
| Derivative, Notional Amount | 1,000,000 | 1,000,000 |
|
Interest Rate Swaps Associated with U.S. Treasuries and Other RMBS [Member] | Derivative Maturity Over Two And Within Three Years From Balance Sheet Date [Member]
|
||
| Derivative [Line Items] | ||
| Derivative, Notional Amount | $ 1,000,000 | $ 1,000,000 |
| Derivative, Average Fixed Interest Rate | 0.799% | 0.799% |
| Derivative, Average Variable Interest Rate | 0.305% | 0.35% |
| Derivative, Weighted Average Remaining Maturity | 2.028 | 2.278 |
| X | ||||||||||
|
- Definition
Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The average time remaining until maturity on the group of derivatives identified. No definition available.
|
| X | ||||||||||
|
- Definition
Average fixed interest rate related to the group of interest rate derivatives. No definition available.
|
| X | ||||||||||
|
- Definition
Average variable interest rate related to the group of interest rate derivatives. No definition available.
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
The total of financial instruments that are bought and held principally for the purpose of selling them in the near term (thus held for only a short period of time) or for debt and equity securities formerly categorized as available-for-sale or held-to-maturity which the entity held as of the date it opted to account for such securities at fair value. An enterprise may also categorize such a security as trading without the intent to sell it in the near term assuming the decision to categorize the security as trading occurred at acquisition. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|