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Residential Mortgage Securities and MSR-Related Assets (Impact of AFS Securities on AOCI) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
AOCI from AFS Securities:
Unrealized gain on AFS securities at beginning of period	$ 52,889	$ 439,898	$ 392,722	$ 417,167
Unrealized (loss)/gain on AFS securities, net	15,082	5,483	408,585	50,085
Reclassification adjustment for MBS sales included in net income	(60)	(14,499)	(389,127)	(36,370)
Reclassification adjustment for impairment included in net income	0	0	(344,269)	0
Change in AOCI from AFS securities	15,022	(9,016)	(324,811)	13,715
Balance at end of period	67,911	430,882	67,911	430,882
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
AOCI from AFS Securities:
Unrealized (loss)/gain on AFS securities, net	0	603	(161)	22,483
Non-Agency MBS
AOCI from AFS Securities:
Unrealized (loss)/gain on AFS securities, net	5,998	2,856	360,315	22,211
MSR-related assets
AOCI from AFS Securities:
Unrealized (loss)/gain on AFS securities, net	$ 9,084	$ 2,024	$ 48,431	$ 5,391

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Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment Excluding Cumulative Effect, Net of Tax, Portion Attributable to Parent

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