Quarterly report pursuant to Section 13 or 15(d)

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

v3.19.3
Schedule of Available-for-sale Securities Reconciliation (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]    
Principal/Current Face $ 35,967,853 $ 34,389,050
Unamortized Premium 1,206,004 1,338,210
Accretable Purchase Discount 462,994 719,204
Credit Reserve Purchase Discount 1,723,638 1,322,762
Amortized Cost 27,564,958 25,432,158
Unrealized Gain 832,002 557,048
Unrealized Loss 78,402 436,602
Available-for-sale securities, at fair value 28,318,558 25,552,604
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Debt Securities, Available-for-sale [Line Items]    
Principal/Current Face 26,013,728 23,891,757
Unamortized Premium 1,115,550 1,247,682
Accretable Purchase Discount 21 25,085
Credit Reserve Purchase Discount 0 0
Amortized Cost 24,371,348 21,998,387
Unrealized Gain 447,373 75,298
Unrealized Loss 52,538 388,652
Available-for-sale securities, at fair value 24,766,183 21,685,033
Mortgage-backed Securities, Issued by Private Enterprises [Member]    
Debt Securities, Available-for-sale [Line Items]    
Principal/Current Face 9,954,125 10,497,293
Unamortized Premium 90,454 90,528
Accretable Purchase Discount 462,973 694,119
Credit Reserve Purchase Discount 1,723,638 1,322,762
Amortized Cost 3,193,610 3,433,771
Unrealized Gain 384,629 481,750
Unrealized Loss 25,864 47,950
Available-for-sale securities, at fair value 3,552,375 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 2,757,909 3,115,967
Unamortized Premium 179,769 209,901
Accretable Purchase Discount 0 0
Credit Reserve Purchase Discount 0 0
Amortized Cost 179,769 209,901
Unrealized Gain 15,881 14,170
Unrealized Loss 46,837 48,655
Available-for-sale securities, at fair value 148,813 175,416
Interest-Only-Strip [Member] | Mortgage-backed Securities, Issued by Private Enterprises [Member]    
Debt Securities, Available-for-sale [Line Items]    
Principal/Current Face 4,664,358 5,137,169
Unamortized Premium 83,037 83,846
Accretable Purchase Discount 0 0
Credit Reserve Purchase Discount 0 0
Amortized Cost 83,037 83,846
Unrealized Gain 4,393 3,655
Unrealized Loss 8,338 3,293
Available-for-sale securities, at fair value 79,092 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 23,255,819 20,775,790
Unamortized Premium 935,781 1,037,781
Accretable Purchase Discount 21 25,085
Credit Reserve Purchase Discount 0 0
Amortized Cost 24,191,579 21,788,486
Unrealized Gain 431,492 61,128
Unrealized Loss 5,701 339,997
Available-for-sale securities, at fair value 24,617,370 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 5,289,767 5,360,124
Unamortized Premium 7,417 6,682
Accretable Purchase Discount 462,973 694,119
Credit Reserve Purchase Discount 1,723,638 1,322,762
Amortized Cost 3,110,573 3,349,925
Unrealized Gain 380,236 478,095
Unrealized Loss 17,526 44,657
Available-for-sale securities, at fair value $ 3,473,283 $ 3,783,363