TWO Annual report pursuant to Section 13 and 15(d)

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

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