Quarterly report pursuant to Section 13 or 15(d)

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

v3.2.0.727
Schedule of Available-for-sale Securities Reconciliation (Details) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Face Value $ 15,889,774 $ 17,713,427
Available-for-sale Securities, Unamortized Premium 612,534 676,641
Available-for-sale Securities, Designated Credit Reserve (657,626) (927,605)
Available-for-sale Securities, Net, Unamortized (3,668,056) (3,977,150)
Available-for-sale Securities, Amortized Cost Basis 12,176,626 13,485,313
Available-for-sale Securities, Gross Unrealized Gains 711,813 891,820
Available-for-sale Securities, Gross Unrealized Losses (80,781) (36,031)
Available-for-sale securities, at fair value 12,807,658 14,341,102
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Face Value 12,222,579 13,421,555
Available-for-sale Securities, Unamortized Premium 612,534 676,641
Available-for-sale Securities, Designated Credit Reserve 0 0
Available-for-sale Securities, Net, Unamortized (2,848,032) (3,009,782)
Available-for-sale Securities, Amortized Cost Basis 9,987,081 11,088,414
Available-for-sale Securities, Gross Unrealized Gains 189,522 238,291
Available-for-sale Securities, Gross Unrealized Losses (75,790) (34,388)
Available-for-sale securities, at fair value 10,100,813 11,292,317
Mortgage-backed Securities, Issued by Private Enterprises [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Face Value 3,667,195 4,291,872
Available-for-sale Securities, Unamortized Premium 0 0
Available-for-sale Securities, Designated Credit Reserve (657,626) (927,605)
Available-for-sale Securities, Net, Unamortized (820,024) (967,368)
Available-for-sale Securities, Amortized Cost Basis 2,189,545 2,396,899
Available-for-sale Securities, Gross Unrealized Gains 522,291 653,529
Available-for-sale Securities, Gross Unrealized Losses (4,991) (1,643)
Available-for-sale securities, at fair value $ 2,706,845 $ 3,048,785