Quarterly report pursuant to Section 13 or 15(d)

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

v3.7.0.1
Schedule of Available-for-sale Securities Reconciliation (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]    
Face Value $ 19,290,272 $ 16,303,556
Unamortized premium 827,000 571,749
Designated credit reserve (433,736) (367,437)
Net, unamortized (3,619,868) (3,567,420)
Amortized Cost 16,063,668 12,940,448
Gross unrealized gains 507,665 432,398
Gross unrealized losses (143,623) (243,989)
Available-for-sale securities, at fair value 16,427,710 13,128,857
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Face Value 16,212,860 13,571,417
Unamortized premium 827,000 571,749
Designated credit reserve 0 0
Net, unamortized (2,813,604) (2,758,445)
Amortized Cost 14,226,256 11,384,721
Gross unrealized gains 84,781 79,040
Gross unrealized losses (139,769) (237,287)
Available-for-sale securities, at fair value 14,171,268 11,226,474
Mortgage-backed Securities, Issued by Private Enterprises [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Face Value 3,077,412 2,732,139
Unamortized premium 0 0
Designated credit reserve (433,736) (367,437)
Net, unamortized (806,264) (808,975)
Amortized Cost 1,837,412 1,555,727
Gross unrealized gains 422,884 353,358
Gross unrealized losses (3,854) (6,702)
Available-for-sale securities, at fair value $ 2,256,442 $ 1,902,383