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Residential Whole Loans (Residential Whole Loans, at Carrying Value) (Details) $ in Thousands		Sep. 30, 2020 USD ($) loan	Jan. 01, 2020 USD ($)	Dec. 31, 2019 USD ($) loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchased Performing Loans		$ 3,791,792		$ 5,370,653
Purchased Credit Deteriorated Loans		702,013		698,717
Total Residential whole loans, at carrying value	[1]	4,493,805		6,069,370
Allowance for credit losses on residential whole loans held at carrying value		(106,246)		(3,025)
Total Residential whole loans at carrying value, net		$ 4,387,559		$ 6,066,345
Number of loans | loan		13,754		17,082
Non-QM Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchased Performing Loans		$ 2,465,148		$ 3,707,245
Rehabilitation loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchased Performing Loans		699,868		1,026,097
Single-family rental loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchased Performing Loans		479,070		460,742
Seasoned performing loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchased Performing Loans		$ 147,706		$ 176,569
Cumulative Effect, Period of Adoption, Adjustment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchased Credit Deteriorated Loans			$ 62,600
[1] Includes approximately $568.6 million and $186.4 million of Residential whole loans, at carrying value and $521.2 million and $567.4 million of Residential whole loans, at fair value transferred to consolidated variable interest entities (“VIEs”) at September 30, 2020 and December 31, 2019, 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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The reserve to cover probable credit losses related to specifically identified fixed maturity real estate loans as well as probable credit losses inherent in the remainder of that loan portfolio.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 310
-Section 45
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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
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