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Derivative Instruments and Hedging Activities Components of Other Income (Expense) Related to Interest Rate and Credit Default Swaps (Details)

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Derivative Instruments and Hedging Activities Components of Other Income (Expense) Related to Interest Rate and Credit Default Swaps (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Derivative Instruments, Gain (Loss) [Line Items]      
Trading securities, at fair value $ 1,000,312   $ 1,000,180
Interest Expense on Interest Rate Swap and Swaption Agreements (13,836) (14,016)  
Termination of Interest Rate Swaps and Swaptions, Number of Positions 7 69  
Termination of Interest Rate Swaps and Swaptions, Notional Amount 2,970,000 8,160,000  
Termination of Interest Rate Swaps and Swaptions, Interest Spread Settlement (862) (17,165)  
Loss on Termination of Interest Rate Swaps and Swaptions (1,240) (58,692)  
Termination of Credit Default Swaps, Number of Positions 3    
Termination of Credit Default Swaps, Notional Amount 305,000    
Termination of Credit Default Swaps, Interest Spread Settlement (1,152)    
Loss on Termination of Credit Default Swaps (13,705)    
Interest Rate Swap [Member]
      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative Asset, Average Notional Amount 19,156,878 14,854,500  
Derivative Liability, Average Notional Amount $ 0