Quarterly report pursuant to Section 13 or 15(d)

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

v3.3.0.814
Schedule of Available-for-sale Securities Reconciliation (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Face Value $ 14,407,205 $ 17,713,427
Available-for-sale Securities, Unamortized Premium 547,121 676,641
Available-for-sale Securities, Designated Credit Reserve (544,173) (927,605)
Available-for-sale Securities, Net, Unamortized (3,551,810) (3,977,150)
Available-for-sale Securities, Amortized Cost Basis 10,858,343 13,485,313
Available-for-sale Securities, Gross Unrealized Gains 627,460 891,820
Available-for-sale Securities, Gross Unrealized Losses (52,608) (36,031)
Available-for-sale securities, at fair value 11,433,195 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 11,120,631 13,421,555
Available-for-sale Securities, Unamortized Premium 547,121 676,641
Available-for-sale Securities, Designated Credit Reserve 0 0
Available-for-sale Securities, Net, Unamortized (2,798,321) (3,009,782)
Available-for-sale Securities, Amortized Cost Basis 8,869,431 11,088,414
Available-for-sale Securities, Gross Unrealized Gains 197,980 238,291
Available-for-sale Securities, Gross Unrealized Losses (41,411) (34,388)
Available-for-sale securities, at fair value 9,026,000 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 3,286,574 4,291,872
Available-for-sale Securities, Unamortized Premium 0 0
Available-for-sale Securities, Designated Credit Reserve (544,173) (927,605)
Available-for-sale Securities, Net, Unamortized (753,489) (967,368)
Available-for-sale Securities, Amortized Cost Basis 1,988,912 2,396,899
Available-for-sale Securities, Gross Unrealized Gains 429,480 653,529
Available-for-sale Securities, Gross Unrealized Losses (11,197) (1,643)
Available-for-sale securities, at fair value $ 2,407,195 $ 3,048,785