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Residential Whole Loans (Residential Whole Loans, at Carrying Value) (Details) $ in Thousands		Sep. 30, 2019 USD ($) loan	Dec. 31, 2018 USD ($) loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchased Performing Loans		$ 4,251,217	$ 2,218,728
Purchased Credit Impaired Loans		718,197	797,987
Total Residential whole loans, at carrying value	[1]	$ 4,969,414	$ 3,016,715
Number of loans | loan		14,968	11,149
Non-QM loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchased Performing Loans		$ 2,727,006	$ 1,354,774
Rehabilitation loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchased Performing Loans		968,867	494,576
Single-family rental loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchased Performing Loans		366,362	145,327
Seasoned performing loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchased Performing Loans		$ 188,982	$ 224,051
[1] Includes approximately $189.9 million and $209.4 million of Residential whole loans, at carrying value and $593.3 million and $694.7 million of Residential whole loans, at fair value transferred to consolidated variable interest entities (“VIEs”) at September 30, 2019 and December 31, 2018, respectively. Such assets can be used only to settle the obligations of each respective VIE.

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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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