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) $ in Thousands	3 Months Ended
	Mar. 31, 2020 USD ($)
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Allowance for credit losses at beginning of period	$ 0
Additions on securities for which credit losses were not previously recorded	(43,895)
Additions arising from purchases of securities accounted for as purchased credit deteriorated	0
Reductions for securities sold	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
Increase (decrease) on securities with previously recorded credit losses	(1,743)
Writeoffs	4,867
Recoveries of amounts previously written off	(2,535)
Allowance for credit losses at end of period	(41,390)
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Additions on securities for which credit losses were not previously recorded	(32,786)
Additions arising from purchases of securities accounted for as purchased credit deteriorated	0
Reductions for securities sold	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
Increase (decrease) on securities with previously recorded credit losses	0
Writeoffs	0
Recoveries of amounts previously written off	0
Allowance for credit losses at end of period	(32,786)
Mortgage-backed Securities, Issued by Private Enterprises [Member]
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Additions on securities for which credit losses were not previously recorded	(11,109)
Additions arising from purchases of securities accounted for as purchased credit deteriorated	0
Reductions for securities sold	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
Increase (decrease) on securities with previously recorded credit losses	(1,743)
Writeoffs	4,867
Recoveries of amounts previously written off	(2,535)
Allowance for credit losses at end of period	$ (8,604)