TWO Quarterly report pursuant to Section 13 or 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) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Allowance for credit losses at beginning of period	$ (18,170)	$ (41,390)	$ (22,528)
Additions on securities for which credit losses were not previously recorded	(3,861)	(305)	(3,881)	$ (44,200)
Reductions for securities sold		0		246,792
Increase (decrease) on securities with previously recorded credit losses	(3,531)	(888)	(2,376)	(2,631)
Writeoffs	7,797	0	11,020	4,867
Recoveries of amounts previously written off		0		(2,535)
Allowance for credit losses at end of period	(17,765)	(42,583)	(17,765)	(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	(16,699)	(32,786)	(17,889)
Additions on securities for which credit losses were not previously recorded	(11)	(10)	(31)	(32,796)
Reductions for securities sold				0
Increase (decrease) on securities with previously recorded credit losses	(297)	2,162	(2,137)	2,162
Writeoffs	1,853	0	4,903	0
Recoveries of amounts previously written off				0
Allowance for credit losses at end of period	(15,154)	(30,634)	(15,154)	(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	(1,471)	(8,604)	(4,639)
Additions on securities for which credit losses were not previously recorded	(3,850)	(295)	(3,850)	(11,404)
Reductions for securities sold				246,792
Increase (decrease) on securities with previously recorded credit losses	(3,234)	(3,050)	(239)	(4,793)
Writeoffs	5,944	0	6,117	4,867
Recoveries of amounts previously written off				(2,535)
Allowance for credit losses at end of period	$ (2,611)	$ (11,949)	$ (2,611)	$ (11,949)