Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Statement of Comprehensive Income [Abstract]
Net Income (Loss)	$ 15,363	$ (215,112)	$ (249,905)
Other comprehensive income (loss):
Reclassification adjustment for realized (gain) on sale of available for sale Agency Securities	(10,952)	(143,877)	(9,611)
Reclassification adjustment for credit loss expense on available for sale Agency Securities	0	1,012	0
Net unrealized gain (loss) on available for sale Agency Securities	(61,106)	(33,577)	408,954
Other comprehensive income (loss)	(72,058)	(176,442)	399,343
Comprehensive Income (Loss)	$ (56,695)	$ (391,554)	$ 149,438