Annual report pursuant to Section 13 and 15(d)

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

v3.3.1.900
Schedule of Available-for-Sale Securities Reconciliation (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Face Value $ 10,912,411 $ 17,713,427
Available-for-sale Securities, Unamortized Premium 394,787 676,641
Available-for-sale Securities, Designated Credit Reserve (409,077) (927,605)
Available-for-sale Securities, Net, Unamortized (3,429,000) (3,977,150)
Available-for-sale Securities, Amortized Cost Basis 7,469,121 13,485,313
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 427,595 891,820
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax (71,396) (36,031)
Available-for-sale securities, at fair value 7,825,320 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 8,257,030 13,421,555
Available-for-sale Securities, Unamortized Premium 394,787 676,641
Available-for-sale Securities, Designated Credit Reserve 0 0
Available-for-sale Securities, Net, Unamortized (2,721,979) (3,009,782)
Available-for-sale Securities, Amortized Cost Basis 5,929,838 11,088,414
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 98,389 238,291
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax (55,337) (34,388)
Available-for-sale securities, at fair value 5,972,890 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 2,655,381 4,291,872
Available-for-sale Securities, Unamortized Premium 0 0
Available-for-sale Securities, Designated Credit Reserve (409,077) (927,605)
Available-for-sale Securities, Net, Unamortized (707,021) (967,368)
Available-for-sale Securities, Amortized Cost Basis 1,539,283 2,396,899
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 329,206 653,529
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax (16,059) (1,643)
Available-for-sale securities, at fair value $ 1,852,430 $ 3,048,785