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Derivatives (Details) (USD $)
Sep. 30, 2011
Dec. 31, 2010
Derivatives  
Derivative assets, fair value$ 81,000 
Linked Transactions, at fair value64,494,000179,915,000
Swaps liabilities, at fair value(134,712,000)(139,142,000)
Swaps | Hedging | Assets.
  
Derivatives  
Derivative assets, fair value53,000 
Notional amount of derivative assets125,000,000 
Swaps | Hedging | Liabilities.
  
Derivatives  
Swaps liabilities, at fair value(134,712,000)(139,142,000)
Notional amount of derivative liabilities3,379,000,000 
Linked Transactions | Non-Hedging | Assets.
  
Derivatives  
Linked Transactions, at fair value64,494,000179,915,000
Swaptions
  
Derivatives  
Derivative assets, fair value28,000 
Swaptions | Hedging | Assets.
  
Derivatives  
Derivative assets, fair value28,000 
Notional amount of derivative assets$ 100,000,000