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Securities, at Fair Value (Interest Income) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Debt Securities, Available-for-sale [Line Items]
Interest income	$ 10,629,000	$ 8,570,000	$ 42,433,000	$ 81,867,000
Agency MBS
Debt Securities, Available-for-sale [Line Items]
Coupon interest	0	0	0	14,038,000
Effective yield adjustment	0	0	0	(5,186,000)
Interest income	0	0	0	8,852,000
Legacy Non-Agency MBS
Debt Securities, Available-for-sale [Line Items]
Coupon interest	0	42,000	14,000	18,222,000
Effective yield adjustment	0	6,000	670,000	10,564,000
Interest income	0	48,000	684,000	28,786,000
Accretion Income			670,000
RPL/NPL MBS
Debt Securities, Available-for-sale [Line Items]
Coupon interest	0	811,000	373,000	7,622,000
Effective yield adjustment	0	94,000	8,136,000	449,000
Interest income	0	905,000	8,509,000	8,071,000
Accretion Income			8,100,000	277,000
CRT securities
Debt Securities, Available-for-sale [Line Items]
Coupon interest	931,000	956,000	2,774,000	6,063,000
Effective yield adjustment	1,364,000	420,000	3,152,000	(94,000)
Interest income	2,295,000	1,376,000	5,926,000	5,969,000
MSR-related assets
Debt Securities, Available-for-sale [Line Items]
Coupon interest	1,595,000	2,991,000	6,044,000	23,332,000
Effective yield adjustment	6,739,000	3,250,000	21,270,000	6,857,000
Interest income	8,334,000	$ 6,241,000	27,314,000	$ 30,189,000
Accretion Income	$ 4,000,000		$ 12,400,000

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- Definition

Accretion Income

+ References

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- Definition

Represents the coupon interest income derived from securities backed by a pool of mortgages or trust deeds.

+ References

No definition available.

+ Details

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- Definition

Represents the following effective yield adjustments pertaining to mortgage backed securities. (1) For Agency MBS, this reflects net premium amortization and discount accretion based on actual prepayment activity. (2) For Non-Agency MBS, this is the difference between the net income calculated using the net yield, which is based on management's estimates of future cash flows, less the current coupon yield.

+ References

No definition available.

+ Details

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- Definition

Amount of operating interest income, including amortization and accretion of premiums and discounts, on securitized, pass-through debt securities collateralized by real estate mortgage loans.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.2)
-URI http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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