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Fair Value of Financial Instruments - Fair Value Hierarchy (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Assets:
Total assets carried at fair value	$ 7,570,529	$ 6,060,888
Liabilities:
Securitized debt	3,531,576	2,435,370
Residential whole loans, at fair value
Assets:
Residential whole loans, at fair value	6,846,570	5,727,524
Liabilities:
Total liabilities carried at fair value	4,438,676	3,898,744
Securities, at fair value
Assets:
Securities, at fair value	723,959	333,364
Agreements with Non-mark-to-market Collateral Provisions
Liabilities:
Liabilities carried at fair value	401,353	884,495
Agreements with Mark-to-market Collateral Provisions
Liabilities:
Liabilities carried at fair value	505,747	578,879
Level 1
Assets:
Total assets carried at fair value	0	0
Liabilities:
Securitized debt	0	0
Level 1 | Residential whole loans, at fair value
Assets:
Residential whole loans, at fair value	0	0
Liabilities:
Total liabilities carried at fair value	0	0
Level 1 | Securities, at fair value
Assets:
Securities, at fair value	0	0
Level 1 | Agreements with Non-mark-to-market Collateral Provisions
Liabilities:
Liabilities carried at fair value	0	0
Level 1 | Agreements with Mark-to-market Collateral Provisions
Liabilities:
Liabilities carried at fair value	0	0
Level 2
Assets:
Total assets carried at fair value	777,107	384,458
Liabilities:
Securitized debt	3,531,576	2,435,370
Level 2 | Residential whole loans, at fair value
Assets:
Residential whole loans, at fair value	53,148	51,094
Liabilities:
Total liabilities carried at fair value	3,531,576	2,435,370
Level 2 | Securities, at fair value
Assets:
Securities, at fair value	723,959	333,364
Level 2 | Agreements with Non-mark-to-market Collateral Provisions
Liabilities:
Liabilities carried at fair value	0	0
Level 2 | Agreements with Mark-to-market Collateral Provisions
Liabilities:
Liabilities carried at fair value	0	0
Level 3
Assets:
Total assets carried at fair value	6,793,422	5,676,430
Liabilities:
Securitized debt	0	0
Level 3 | Residential whole loans, at fair value
Assets:
Residential whole loans, at fair value	6,793,422	5,676,430
Liabilities:
Total liabilities carried at fair value	907,100	1,463,374
Level 3 | Securities, at fair value
Assets:
Securities, at fair value	0	0
Level 3 | Agreements with Non-mark-to-market Collateral Provisions
Liabilities:
Liabilities carried at fair value	401,353	884,495
Level 3 | Agreements with Mark-to-market Collateral Provisions
Liabilities:
Liabilities carried at fair value	$ 505,747	$ 578,879

X

- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482106/820-10-50-2

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- Definition

The fair value as of the balance sheet date of firm holdings in mortgages, mortgage backed securities (investment instruments that represent ownership of an undivided interest in a group of mortgages, where principal and interest from the individual mortgages are used to pay investors' principal and interest on the mortgage backed security) and asset-backed securities that are primarily paid from the cash flows of a discrete pool of receivables or other financial assets (such as credit-card receivables), either fixed or revolving, that by their terms convert into cash within a finite time period. Includes both pledged (to counterparties as collateral for financing transactions) and unpledged holdings.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 940
-SubTopic 320
-Section 45
-Paragraph 2
-Publisher FASB
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-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
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- Definition

Fair value portion of an agreement for an unconditional promise by the maker to pay the holder a definite sum of money at a future date.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 10
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482907/825-10-50-10

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Fair value portion of other liabilities.

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