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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, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
AOCI from AFS Securities:
Unrealized gain on AFS securities at beginning of period	$ 439,898	$ 548,551	$ 417,167	$ 620,648
Reclassification adjustment for MBS sales included in net income	(14,499)	(9,455)	(36,370)	(25,580)
Change in AOCI from AFS securities	(9,016)	(43,733)	13,715	(115,830)
Balance at end of period	430,882	504,818	430,882	504,818
Agency MBS
AOCI from AFS Securities:
Unrealized (loss)/gain on AFS securities, net	603	(9,177)	22,483	(27,507)
Non-Agency MBS
AOCI from AFS Securities:
Unrealized (loss)/gain on AFS securities, net	2,856	(25,101)	22,211	(62,979)
MSR-related assets
AOCI from AFS Securities:
Unrealized (loss)/gain on AFS securities, net	$ 2,024	$ 0	$ 5,391	$ 236

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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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Amount, after tax, of accumulated unrealized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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