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
Jun. 30, 2013
Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, at fair value $ 14,892,315 $ 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 13,791,266 11,934,492
Available-for-sale Securities, Unamortized Premium 809,226 749,252
Available-for-sale Securities, Designated Credit Reserve 0 0
Available-for-sale Securities, Net, Unamortized (2,359,641) (1,929,811)
Available-for-sale Securities, Amortized Cost Basis 12,240,851 10,753,933
Available-for-sale Securities, Unrealized Gains 101,471 276,293
Available-for-sale Securities, Gross Unrealized Losses (401,494) (18,123)
Available-for-sale securities, at fair value 11,940,828 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 4,994,692 4,503,999
Available-for-sale Securities, Unamortized Premium 0 0
Available-for-sale Securities, Designated Credit Reserve (1,386,607) (1,290,946)
Available-for-sale Securities, Net, Unamortized (1,222,618) (996,490)
Available-for-sale Securities, Amortized Cost Basis 2,385,467 2,216,563
Available-for-sale Securities, Unrealized Gains 577,151 448,403
Available-for-sale Securities, Gross Unrealized Losses (11,131) (10,115)
Available-for-sale securities, at fair value 2,951,487 2,654,851
Collateralized Mortgage Backed Securities [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Face Value 18,785,958 16,438,491
Available-for-sale Securities, Unamortized Premium 809,226 749,252
Available-for-sale Securities, Designated Credit Reserve (1,386,607) (1,290,946)
Available-for-sale Securities, Net, Unamortized (3,582,259) (2,926,301)
Available-for-sale Securities, Amortized Cost Basis 14,626,318 12,970,496
Available-for-sale Securities, Unrealized Gains 678,622 724,696
Available-for-sale Securities, Gross Unrealized Losses (412,625) (28,238)
Available-for-sale securities, at fair value $ 14,892,315 $ 13,666,954