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Components of Carrying Value of Available-For-Sale Agency Securities (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Schedule Of Available For Sale Securities [Line Items]    
Principal balance $ 16,525,003 $ 17,044,190
Unamortized premium 469,197 488,854
Unamortized discount   (2)
Gross Unrealized Gain 235,473 229,509
Gross unrealized losses (91,717) (120,019)
Carrying value/estimated fair value $ 17,137,956 $ 17,642,532