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Fair Value of Financial Instruments - Level 3 Assets (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Unsettled residential whole loans	$ 28,900
Recurring basis | Level 3 | Residential whole loans, at fair value
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	4,222,583	$ 1,216,902
Purchases and originations	1,114,043	0
Draws	61,340	0
Changes in fair value recorded in Net gain on residential whole loans measured at fair value through earnings	(223,412)	32,088
Repayments	(202,084)	(25,571)
Sales and repurchases	(1,547)	0
Transfer to REO	(14,151)	(15,422)
Balance at end of period	$ 4,956,772	$ 1,207,997

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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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- 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)
-URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258

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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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-Topic 820
-SubTopic 10
-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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