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, 2018	Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]
Principal/Current Face	$ 34,389,050	$ 29,396,680
Unamortized Premium	1,338,210	1,370,959
Accretable Purchase Discount	719,204	700,671
Credit Reserve Purchase Discount	1,322,762	653,613
Amortized Cost	25,432,158	20,856,658
Unrealized Gain	557,048	544,198
Unrealized Loss	436,602	180,037
Available-for-sale securities, at fair value	25,552,604	21,220,819
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Debt Securities, Available-for-sale [Line Items]
Principal/Current Face	23,891,757	20,023,621
Unamortized Premium	1,247,682	1,302,535
Accretable Purchase Discount	25,085	24,638
Credit Reserve Purchase Discount	0	0
Amortized Cost	21,998,387	18,359,746
Unrealized Gain	75,298	53,104
Unrealized Loss	388,652	174,125
Available-for-sale securities, at fair value	21,685,033	18,238,725
Mortgage-backed Securities, Issued by Private Enterprises [Member]
Debt Securities, Available-for-sale [Line Items]
Principal/Current Face	10,497,293	9,373,059
Unamortized Premium	90,528	68,424
Accretable Purchase Discount	694,119	676,033
Credit Reserve Purchase Discount	1,322,762	653,613
Amortized Cost	3,433,771	2,496,912
Unrealized Gain	481,750	491,094
Unrealized Loss	47,950	5,912
Available-for-sale securities, at fair value	3,867,571	2,982,094
Interest-Only-Strip [Member] \| Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Debt Securities, Available-for-sale [Line Items]
Principal/Current Face	3,115,967	2,941,772
Unamortized Premium	209,901	223,289
Accretable Purchase Discount	0	0
Credit Reserve Purchase Discount	0	0
Amortized Cost	209,901	223,289
Unrealized Gain	14,170	10,955
Unrealized Loss	48,655	39,156
Available-for-sale securities, at fair value	175,416	195,088
Interest-Only-Strip [Member] \| Mortgage-backed Securities, Issued by Private Enterprises [Member]
Debt Securities, Available-for-sale [Line Items]
Principal/Current Face	5,137,169	5,614,925
Unamortized Premium	83,846	65,667
Accretable Purchase Discount	0	0
Credit Reserve Purchase Discount	0	0
Amortized Cost	83,846	65,667
Unrealized Gain	3,655	2,163
Unrealized Loss	3,293	2,746
Available-for-sale securities, at fair value	84,208	65,084
Fixed Income Securities [Member] \| Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Debt Securities, Available-for-sale [Line Items]
Principal/Current Face	20,775,790	17,081,849
Unamortized Premium	1,037,781	1,079,246
Accretable Purchase Discount	25,085	24,638
Credit Reserve Purchase Discount	0	0
Amortized Cost	21,788,486	18,136,457
Unrealized Gain	61,128	42,149
Unrealized Loss	339,997	134,969
Available-for-sale securities, at fair value	21,509,617	18,043,637
Fixed Income Securities [Member] \| Mortgage-backed Securities, Issued by Private Enterprises [Member]
Debt Securities, Available-for-sale [Line Items]
Principal/Current Face	5,360,124	3,758,134
Unamortized Premium	6,682	2,757
Accretable Purchase Discount	694,119	676,033
Credit Reserve Purchase Discount	1,322,762	653,613
Amortized Cost	3,349,925	2,431,245
Unrealized Gain	478,095	488,931
Unrealized Loss	44,657	3,166
Available-for-sale securities, at fair value	$ 3,783,363	$ 2,917,010