Quarterly report pursuant to Section 13 or 15(d)

Available-for-Sale Securities, at Fair Value (Details)

v2.4.0.8
Available-for-Sale Securities, at Fair Value (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, at fair value $ 12,634,056 $ 12,256,727
Federal Home Loan Mortgage Corporation Certificates and Obligations (FHLMC) [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, at fair value 2,814,452 2,977,291
Federal National Mortgage Association Certificates and Obligations (FNMA) [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, at fair value 4,919,714 4,435,820
Government National Mortgage Association Certificates and Obligations (GNMA) [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, at fair value 2,089,759 2,084,298
Mortgage-backed Securities, Issued by Private Enterprises [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, at fair value $ 2,810,131 $ 2,759,318