XML 51 R35.htm IDEA: XBRL DOCUMENT v2.4.0.8
Components of Carrying Value of Available-For-Sale Agency Securities (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Schedule Of Available For Sale Securities [Line Items]    
Principal balance $ 17,044,190 $ 22,771,731
Unamortized premium 488,854 648,181
Unamortized discount (2) (4)
Gross unrealized gains 229,509 499,464
Gross unrealized losses (120,019) (121)
Carrying value/estimated fair value $ 17,642,532 $ 23,919,251