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

Available-for-sale Securities, Rollforward of the Allowance for Credit Losses (Details)

Available-for-sale Securities, Rollforward of the Allowance for Credit Losses (Details) $ in Thousands	12 Months Ended
	Dec. 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	(44,359)
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	(14,081)
Writeoffs	36,531
Recoveries of amounts previously written off	(2,535)
Allowance for credit losses at end of period	(22,528)
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	32,931
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	(385)
Writeoffs	(14,657)
Recoveries of amounts previously written off	0
Allowance for credit losses at end of period	(17,889)
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	11,428
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	14,466
Writeoffs	(21,874)
Recoveries of amounts previously written off	2,535
Allowance for credit losses at end of period	$ (4,639)