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Residential Whole Loans (Residential Whole Loans, at Carrying Value) (Details) $ in Thousands		Dec. 31, 2019 USD ($) loan	Dec. 31, 2018 USD ($) loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchased performing loans		$ 5,367,871	$ 2,218,728
Purchased credit impaired loans		698,474	797,987
Total Residential whole loans, at carrying value	[1]	$ 6,066,345	$ 3,016,715
Number of loans | loan		17,082	11,149
Non-QM loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchased performing loans		$ 3,706,857	$ 1,354,774
Rehabilitation loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchased performing loans		1,023,766	494,576
Single-family rental loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchased performing loans		460,679	145,327
Seasoned performing loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchased performing loans		$ 176,569	$ 224,051
[1] Includes approximately $186.4 million and $209.4 million of Residential whole loans, at carrying value and $567.4 million and $694.7 million of Residential whole loans, at fair value transferred to consolidated variable interest entities (“VIEs”) at December 31, 2019 and 2018, respectively. Such assets can be used only to settle the obligations of each respective VIE.

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Purchased Performing Loans

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Residential whole loans arising from the Company’s 100% equity interest in certificates issued by certain trusts established to acquire the loans.

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Residential Whole Loans, Carrying Value

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The recorded balance, net of any applicable reductions (for example, unamortized accretable yield and allowance for loan losses). This relates to loans not accounted for debt securities with evidence of deterioration of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=118939070&loc=d3e15032-111544

Reference 2: 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=118938799&loc=d3e13503-111538

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