TWO Quarterly report pursuant to Section 13 or 15(d)

Available-for-Sale Securities, at Fair Value Available-for-sale Securities, Rollforward of the Allowance for Credit Losses (Details)

Available-for-Sale Securities, at Fair Value Available-for-sale Securities, Rollforward of the Allowance for Credit Losses (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2020
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Allowance for credit losses at beginning of period	$ (41,390)	$ 0
Additions on securities for which credit losses were not previously recorded	(305)	(44,200)
Additions arising from purchases of securities accounted for as purchased credit deteriorated	0	0
Reductions for securities sold	0	246,792
Reductions due to the intent to sell or more likely than not will be required to sell the security before recovery of its amortized cost	0	0
Increase (decrease) on securities with previously recorded credit losses	(888)	(2,631)
Writeoffs	0	4,867
Recoveries of amounts previously written off	0	(2,535)
Allowance for credit losses at end of period	(42,583)	(42,583)
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Allowance for credit losses at beginning of period	32,786
Additions on securities for which credit losses were not previously recorded	10	32,796
Additions arising from purchases of securities accounted for as purchased credit deteriorated	0	0
Reductions for securities sold	0	0
Reductions due to the intent to sell or more likely than not will be required to sell the security before recovery of its amortized cost	0	0
Increase (decrease) on securities with previously recorded credit losses	(2,162)	(2,162)
Writeoffs	0	0
Recoveries of amounts previously written off	0	0
Allowance for credit losses at end of period	(30,634)	(30,634)
Mortgage-backed Securities, Issued by Private Enterprises [Member]
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Allowance for credit losses at beginning of period	8,604
Additions on securities for which credit losses were not previously recorded	295	11,404
Additions arising from purchases of securities accounted for as purchased credit deteriorated	0	0
Reductions for securities sold	0	(246,792)
Reductions due to the intent to sell or more likely than not will be required to sell the security before recovery of its amortized cost	0	0
Increase (decrease) on securities with previously recorded credit losses	3,050	4,793
Writeoffs	0	(4,867)
Recoveries of amounts previously written off	0	2,535
Allowance for credit losses at end of period	$ (11,949)	$ (11,949)