Quarterly report pursuant to Section 13 or 15(d)

Schedule of Available-for-sale Securities Reconciliation (Details)

v2.4.0.8
Schedule of Available-for-sale Securities Reconciliation (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, at fair value $ 12,672,233 $ 13,666,954
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Face Value 12,039,928 11,934,492
Available-for-sale Securities, Unamortized Premium 636,576 749,252
Available-for-sale Securities, Designated Credit Reserve 0 0
Available-for-sale Securities, Net, Unamortized (2,901,668) (1,929,811)
Available-for-sale Securities, Amortized Cost Basis 9,774,836 10,753,933
Available-for-sale Securities, Unrealized Gains 113,221 276,293
Available-for-sale Securities, Gross Unrealized Losses (170,119) (18,123)
Available-for-sale securities, at fair value 9,717,938 11,012,103
Mortgage-backed Securities, Issued by Private Enterprises [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Face Value 4,919,072 4,503,999
Available-for-sale Securities, Unamortized Premium 0 0
Available-for-sale Securities, Designated Credit Reserve (1,372,628) (1,290,946)
Available-for-sale Securities, Net, Unamortized (1,161,821) (996,490)
Available-for-sale Securities, Amortized Cost Basis 2,384,623 2,216,563
Available-for-sale Securities, Unrealized Gains 580,004 448,403
Available-for-sale Securities, Gross Unrealized Losses (10,332) (10,115)
Available-for-sale securities, at fair value 2,954,295 2,654,851
Collateralized Mortgage Backed Securities [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Face Value 16,959,000 16,438,491
Available-for-sale Securities, Unamortized Premium 636,576 749,252
Available-for-sale Securities, Designated Credit Reserve (1,372,628) (1,290,946)
Available-for-sale Securities, Net, Unamortized (4,063,489) (2,926,301)
Available-for-sale Securities, Amortized Cost Basis 12,159,459 12,970,496
Available-for-sale Securities, Unrealized Gains 693,225 724,696
Available-for-sale Securities, Gross Unrealized Losses (180,451) (28,238)
Available-for-sale securities, at fair value $ 12,672,233 $ 13,666,954