Quarterly report pursuant to Section 13 or 15(d)

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

v3.19.2
Schedule of Available-for-sale Securities Reconciliation (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]    
Principal/Current Face $ 38,135,044 $ 34,389,050
Unamortized Premium 1,296,739 1,338,210
Accretable Purchase Discount 589,395 719,204
Credit Reserve Purchase Discount 1,640,055 1,322,762
Amortized Cost 29,401,867 25,432,158
Unrealized Gain 872,066 557,048
Unrealized Loss 87,854 436,602
Available-for-sale securities, at fair value 30,186,079 25,552,604
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Debt Securities, Available-for-sale [Line Items]    
Principal/Current Face 27,656,152 23,891,757
Unamortized Premium 1,202,077 1,247,682
Accretable Purchase Discount 24 25,085
Credit Reserve Purchase Discount 0 0
Amortized Cost 25,969,808 21,998,387
Unrealized Gain 406,355 75,298
Unrealized Loss 67,720 388,652
Available-for-sale securities, at fair value 26,308,443 21,685,033
Mortgage-backed Securities, Issued by Private Enterprises [Member]    
Debt Securities, Available-for-sale [Line Items]    
Principal/Current Face 10,478,892 10,497,293
Unamortized Premium 94,662 90,528
Accretable Purchase Discount 589,371 694,119
Credit Reserve Purchase Discount 1,640,055 1,322,762
Amortized Cost 3,432,059 3,433,771
Unrealized Gain 465,711 481,750
Unrealized Loss 20,134 47,950
Available-for-sale securities, at fair value 3,877,636 3,867,571
Interest-Only-Strip [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Debt Securities, Available-for-sale [Line Items]    
Principal/Current Face 2,888,397 3,115,967
Unamortized Premium 188,009 209,901
Accretable Purchase Discount 0 0
Credit Reserve Purchase Discount 0 0
Amortized Cost 188,009 209,901
Unrealized Gain 17,731 14,170
Unrealized Loss 45,975 48,655
Available-for-sale securities, at fair value 159,765 175,416
Interest-Only-Strip [Member] | Mortgage-backed Securities, Issued by Private Enterprises [Member]    
Debt Securities, Available-for-sale [Line Items]    
Principal/Current Face 4,912,069 5,137,169
Unamortized Premium 88,917 83,846
Accretable Purchase Discount 0 0
Credit Reserve Purchase Discount 0 0
Amortized Cost 88,917 83,846
Unrealized Gain 4,530 3,655
Unrealized Loss 2,156 3,293
Available-for-sale securities, at fair value 91,291 84,208
Fixed Income Securities [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Debt Securities, Available-for-sale [Line Items]    
Principal/Current Face 24,767,755 20,775,790
Unamortized Premium 1,014,068 1,037,781
Accretable Purchase Discount 24 25,085
Credit Reserve Purchase Discount 0 0
Amortized Cost 25,781,799 21,788,486
Unrealized Gain 388,624 61,128
Unrealized Loss 21,745 339,997
Available-for-sale securities, at fair value 26,148,678 21,509,617
Fixed Income Securities [Member] | Mortgage-backed Securities, Issued by Private Enterprises [Member]    
Debt Securities, Available-for-sale [Line Items]    
Principal/Current Face 5,566,823 5,360,124
Unamortized Premium 5,745 6,682
Accretable Purchase Discount 589,371 694,119
Credit Reserve Purchase Discount 1,640,055 1,322,762
Amortized Cost 3,343,142 3,349,925
Unrealized Gain 461,181 478,095
Unrealized Loss 17,978 44,657
Available-for-sale securities, at fair value $ 3,786,345 $ 3,783,363