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Fair Value of Financial Instruments - Level 3 Assets (Details) - Recurring basis - Level 3 - Residential whole loans, at fair value - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	$ 5,252,047	$ 2,003,580	$ 4,222,584	$ 1,216,902
Purchases and originations	591,184	1,968,079	2,379,428	2,805,939
Draws	106,633	11,152	250,455	11,575
Changes in fair value recorded in Net gain on residential whole loans measured at fair value through earnings	(241,093)	20,494	(623,012)	58,807
Repayments	(236,236)	(65,985)	(718,983)	(130,488)
Sales and repurchases	0	241	(10,496)	671
Transfer to REO	(9,565)	(6,978)	(37,006)	(32,823)
Balance at end of period	$ 5,462,970	3,930,583	$ 5,462,970	3,930,583
Unsettled residential whole loans		$ 163,000		$ 163,000

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- Definition

Fair Value, Measurement With Unobservable Inputs Reconciliation, Recurring Basis, Asset, Originations And Draws

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Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Collection Of Principal

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Unsettled Residential Whole Loans

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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- Definition

Amount of gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)
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Amount of purchases of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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-Publisher FASB
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-Section 50
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Amount of transfer of financial instrument classified as an asset into (out of) level 3 of the fair value hierarchy.

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