|
Derivative Instruments and Hedging Activities Schedule of Interest Rate Swaps Associated with U.S. Treasuries (Details) (USD $)
In Thousands, unless otherwise specified |
Mar. 31, 2014
|
Dec. 31, 2013
|
|---|---|---|
| Derivative [Line Items] | ||
| Trading securities, at fair value | $ 1,000,312 | $ 1,000,180 |
|
Interest Rate Risk Associated with U.S. Treasuries [Member] | Interest Rate Swap [Member]
|
||
| Derivative [Line Items] | ||
| Derivative, Notional Amount | 1,000,000 | 1,000,000 |
|
Interest Rate Risk Associated with U.S. Treasuries [Member] | Interest Rate Swap [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 | 0.955% | 0.955% |
| Derivative, Average Variable Interest Rate | 0.233% | 0.239% |
| Derivative, Weighted Average Remaining Maturity | 2.417 | 2.667 |
| 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
Amount of investments in debt and equity securities and other forms of securities that provide ownership interests classified as trading. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|