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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME/(LOSS) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Statement of Comprehensive Income [Abstract]
Net (loss)/income	$ (908,995)	$ 88,857
Other Comprehensive Income/(Loss):
Unrealized gains on securities available-for-sale	124,410	22,103
Reclassification adjustment for MBS sales included in net income	(23,953)	(17,009)
Reclassification adjustment for impairments included in net income	(344,269)	0
Derivative hedging instrument fair value changes, net	(50,127)	(10,445)
Amortization of de-designated hedging instruments, net	1,594	(341)
Other Comprehensive Income/(Loss)	(292,345)	(5,692)
Comprehensive income before preferred stock dividends	(1,201,340)	83,165
Dividends required on preferred stock	(5,215)	(3,750)
Comprehensive Income Available to Common Stock and Participating Securities	$ (1,206,555)	$ 79,415

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