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Fair Value of Financial Instruments (Fair Value Hierarchy) (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Assets:
Total assets carried at fair value	$ 2,437,690	$ 1,616,901
Liabilities:
Securitized debt	640,696	869,482
Residential whole loans
Assets:
Residential whole loans, at fair value	2,134,855	1,216,902
Liabilities:
Total liabilities carried at fair value	2,294,103	3,366,772
Securities, at fair value
Assets:
Securities, at fair value	302,835	399,999
Agreements with Non-mark-to-market Collateral Provisions
Liabilities:
Liabilities carried at fair value	795,341	1,159,213
Agreements with Mark-to-market Collateral Provisions
Liabilities:
Liabilities carried at fair value	858,066	1,338,077
Level 1
Assets:
Total assets carried at fair value	0	0
Liabilities:
Securitized debt	0	0
Level 1 | Residential whole loans
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	302,835	399,999
Liabilities:
Securitized debt	640,696	869,482
Level 2 | Residential whole loans
Assets:
Residential whole loans, at fair value	0	0
Liabilities:
Total liabilities carried at fair value	640,696	1,083,397
Level 2 | Securities, at fair value
Assets:
Securities, at fair value	302,835	399,999
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	213,915
Level 3
Assets:
Total assets carried at fair value	2,134,855	1,216,902
Liabilities:
Securitized debt	0	0
Level 3 | Residential whole loans
Assets:
Residential whole loans, at fair value	2,134,855	1,216,902
Liabilities:
Total liabilities carried at fair value	1,653,407	2,283,375
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	795,341	1,159,213
Level 3 | Agreements with Mark-to-market Collateral Provisions
Liabilities:
Liabilities carried at fair value	$ 858,066	$ 1,124,162

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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
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Fair value at acquisition of acquired loans not accounted for as debt securities with evidence of deterioration of credit quality.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 30
-Section 15
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=123409700&loc=d3e13503-111538

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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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.

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-Topic 940
-SubTopic 320
-Section 45
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Fair value of financial and nonfinancial obligations.

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Fair value portion of other liabilities.

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