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		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Allowance for credit losses at beginning of period	$ (17,765)	$ (42,583)	$ (22,528)
Additions on securities for which credit losses were not previously recorded	(26)	(86)	(3,907)	$ (44,286)
Reductions for securities sold		0		246,792
Increase (decrease) on securities with previously recorded credit losses	(133)	(7,014)	(2,509)	(9,645)
Writeoffs	2,495	24,188	13,515	29,055
Recoveries of amounts previously written off		0		(2,535)
Allowance for credit losses at end of period	(15,429)	(25,495)	(15,429)	(25,495)
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	(15,154)	(30,634)	(17,889)
Additions on securities for which credit losses were not previously recorded	(26)	(86)	(57)	(32,882)
Reductions for securities sold				0
Increase (decrease) on securities with previously recorded credit losses	(1,156)	(558)	(3,293)	1,604
Writeoffs	2,336	12,037	7,239	12,037
Recoveries of amounts previously written off				0
Allowance for credit losses at end of period	(14,000)	(19,241)	(14,000)	(19,241)
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	(2,611)	(11,949)	(4,639)
Additions on securities for which credit losses were not previously recorded	0	0	(3,850)	(11,404)
Reductions for securities sold				246,792
Increase (decrease) on securities with previously recorded credit losses	1,023	(6,456)	784	(11,249)
Writeoffs	159	12,151	6,276	17,018
Recoveries of amounts previously written off				(2,535)
Allowance for credit losses at end of period	$ (1,429)	$ (6,254)	$ (1,429)	$ (6,254)