Annual report pursuant to Section 13 and 15(d)

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

v3.19.3.a.u2
Schedule of Available-for-sale Securities Reconciliation (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]    
Principal/Current Face $ 38,696,494 $ 34,389,050
Unamortized Premium 1,245,069 1,338,210
Accretable Purchase Discount 560,159 719,204
Credit Reserve Purchase Discount 1,711,951 1,322,762
Available-for-sale securities, amortized cost 30,711,157 25,432,158
Unrealized Gain 783,164 557,048
Unrealized Loss 87,993 436,602
Available-for-sale securities, at fair value 31,406,328 25,552,604
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Debt Securities, Available-for-sale [Line Items]    
Principal/Current Face 28,841,237 23,891,757
Unamortized Premium 1,156,154 1,247,682
Accretable Purchase Discount 19 25,085
Credit Reserve Purchase Discount 0 0
Available-for-sale securities, amortized cost 27,395,679 21,998,387
Unrealized Gain 438,542 75,298
Unrealized Loss 56,166 388,652
Available-for-sale securities, at fair value 27,778,055 21,685,033
Mortgage-backed Securities, Issued by Private Enterprises [Member]    
Debt Securities, Available-for-sale [Line Items]    
Principal/Current Face 9,855,257 10,497,293
Unamortized Premium 88,915 90,528
Accretable Purchase Discount 560,140 694,119
Credit Reserve Purchase Discount 1,711,951 1,322,762
Available-for-sale securities, amortized cost 3,315,478 3,433,771
Unrealized Gain 344,622 481,750
Unrealized Loss 31,827 47,950
Available-for-sale securities, at fair value 3,628,273 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 2,601,693 3,115,967
Unamortized Premium 169,811 209,901
Accretable Purchase Discount 0 0
Credit Reserve Purchase Discount 0 0
Available-for-sale securities, amortized cost 169,811 209,901
Unrealized Gain 13,724 14,170
Unrealized Loss 47,351 48,655
Available-for-sale securities, at fair value 136,184 175,416
Interest-Only-Strip [Member] | Mortgage-backed Securities, Issued by Private Enterprises [Member]    
Debt Securities, Available-for-sale [Line Items]    
Principal/Current Face 4,356,603 5,137,169
Unamortized Premium 79,935 83,846
Accretable Purchase Discount 0 0
Credit Reserve Purchase Discount 0 0
Available-for-sale securities, amortized cost 79,935 83,846
Unrealized Gain 3,039 3,655
Unrealized Loss 8,564 3,293
Available-for-sale securities, at fair value 74,410 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 26,239,544 20,775,790
Unamortized Premium 986,343 1,037,781
Accretable Purchase Discount 19 25,085
Credit Reserve Purchase Discount 0 0
Available-for-sale securities, amortized cost 27,225,868 21,788,486
Unrealized Gain 424,818 61,128
Unrealized Loss 8,815 339,997
Available-for-sale securities, at fair value 27,641,871 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 5,498,654 5,360,124
Unamortized Premium 8,980 6,682
Accretable Purchase Discount 560,140 694,119
Credit Reserve Purchase Discount 1,711,951 1,322,762
Available-for-sale securities, amortized cost 3,235,543 3,349,925
Unrealized Gain 341,583 478,095
Unrealized Loss 23,263 44,657
Available-for-sale securities, at fair value $ 3,553,863 $ 3,783,363