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Components of Carrying Value of Available-For-Sale MBS (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Investments Debt And Equity Securities [Abstract]    
Principal balance $ 16,236,142 $ 17,044,190
Unamortized premium 461,143 488,854
Unamortized discount   (2)
Gross Unrealized Gain 245,474 229,509
Gross Unrealized Loss (52,335) (120,019)
Carrying value/estimated fair value $ 16,890,424 $ 17,642,532