Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Tax Basis

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Mortgage Loans on Real Estate, Amortization (Discount) Accretion, Net

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Mortgage Loans on Real Estate, Provision for Loan Loss

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Mortgage Loans on Real Estate, Repurchases

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Mortgage Loans on Real Estate, Transfer to REO

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Amount of decrease in investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate, from collection of principal.

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Interest rate of mortgage loan within investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate.

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Number of mortgage loans within investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate.

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Amount of principal due on delinquent mortgage loan within investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate.

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Fair value at acquisition of acquired loans not accounted for as debt securities with evidence of deterioration of credit quality.

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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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The undiscounted sum of all amounts, including amounts deemed principal, interest, fees, penalties, and other under the loan, owed to the investor at the reporting date, whether or not currently due and whether or not any such amounts have been written or charged off by the investor. This relates to loans not accounted for as 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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Amount of gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3).

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Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

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Amount of increase in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate, from new investment.

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Schedule IV - Mortgage Loans on Real Estate (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($) loan	Dec. 31, 2019 USD ($)	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Allowance for credit loss	$ 86,833	$ 3,025	$ 106,246	$ 136,589	$ 218,011	$ 2,271	$ 1,986	$ 1,651	$ 968
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward]
Residential whole loans, at carrying value, beginning balance	698,717
Residential whole loans, at fair value, beginning balance	1,381,583
Residential whole loans, at carrying value, ending balance	673,708	698,717
Residential whole loans, at fair value, ending balance	$ 1,216,902	1,381,583
Residential whole loans, at fair value
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Number \| loan	18,734
Balance Sheet Reported Amount	$ 5,412,234
Principal Amount of Loans Subject to Delinquent Principal or Interest	1,080,733
Tax basis of loans	$ 3,900,000
Residential whole loans, at fair value \| Carrying value
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Number \| loan	13,112
Balance Sheet Reported Amount	$ 4,195,332
Principal Amount of Loans Subject to Delinquent Principal or Interest	455,112
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward]
Residential whole loans, at carrying value, beginning balance	6,066,345
Purchases	1,431,673
Repayments	(1,565,553)
Premium amortization/discount accretion, net	(11,590)
Provision for loan loss	(21,447)
Loan sales and repurchases	(1,766,220)
Transfer to REO	(24,709)
Residential whole loans, at carrying value, ending balance	$ 4,108,499	6,066,345
Residential whole loans, at fair value \| Fair value
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Number \| loan	5,622
Balance Sheet Reported Amount	$ 1,216,902
Principal Amount of Loans Subject to Delinquent Principal or Interest	625,621
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward]
Residential whole loans, at fair value, beginning balance	1,381,583
Purchases	0
Changes in unrealized gains	17,204
Repayments	(92,733)
Repurchases	(18,530)
Transfer to REO	(70,622)
Residential whole loans, at fair value, ending balance	$ 1,216,902	$ 1,381,583
Original loan balance $0 - $149,999 \| Residential whole loans, at fair value \| Carrying value
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Number \| loan	3,947
Balance Sheet Reported Amount	$ 347,041
Principal Amount of Loans Subject to Delinquent Principal or Interest	$ 29,614
Original loan balance $0 - $149,999 \| Residential whole loans, at fair value \| Carrying value \| Minimum
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Interest Rate	0.00%
Original loan balance $0 - $149,999 \| Residential whole loans, at fair value \| Carrying value \| Maximum
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Interest Rate	16.00%
Original loan balance $0 - $149,999 \| Residential whole loans, at fair value \| Fair value
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Number \| loan	2,044
Balance Sheet Reported Amount	$ 167,671
Principal Amount of Loans Subject to Delinquent Principal or Interest	$ 70,748
Original loan balance $0 - $149,999 \| Residential whole loans, at fair value \| Fair value \| Minimum
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Interest Rate	0.00%
Original loan balance $0 - $149,999 \| Residential whole loans, at fair value \| Fair value \| Maximum
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Interest Rate	14.13%
Original loan balance $150,000 - $299,999 \| Residential whole loans, at fair value \| Carrying value
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Number \| loan	4,341
Balance Sheet Reported Amount	$ 832,365
Principal Amount of Loans Subject to Delinquent Principal or Interest	$ 73,749
Original loan balance $150,000 - $299,999 \| Residential whole loans, at fair value \| Carrying value \| Minimum
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Interest Rate	0.00%
Original loan balance $150,000 - $299,999 \| Residential whole loans, at fair value \| Carrying value \| Maximum
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Interest Rate	13.49%
Original loan balance $150,000 - $299,999 \| Residential whole loans, at fair value \| Fair value
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Number \| loan	1,909
Balance Sheet Reported Amount	$ 355,854
Principal Amount of Loans Subject to Delinquent Principal or Interest	$ 167,303
Original loan balance $150,000 - $299,999 \| Residential whole loans, at fair value \| Fair value \| Minimum
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Interest Rate	1.95%
Original loan balance $150,000 - $299,999 \| Residential whole loans, at fair value \| Fair value \| Maximum
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Interest Rate	11.53%
Original loan balance $300,000 - $449,999 \| Residential whole loans, at fair value \| Carrying value
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Number \| loan	2,064
Balance Sheet Reported Amount	$ 667,272
Principal Amount of Loans Subject to Delinquent Principal or Interest	$ 65,629
Original loan balance $300,000 - $449,999 \| Residential whole loans, at fair value \| Carrying value \| Minimum
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Interest Rate	1.50%
Original loan balance $300,000 - $449,999 \| Residential whole loans, at fair value \| Carrying value \| Maximum
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Interest Rate	9.63%
Original loan balance $300,000 - $449,999 \| Residential whole loans, at fair value \| Fair value
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Number \| loan	1,000
Balance Sheet Reported Amount	$ 313,588
Principal Amount of Loans Subject to Delinquent Principal or Interest	$ 165,901
Original loan balance $300,000 - $449,999 \| Residential whole loans, at fair value \| Fair value \| Minimum
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Interest Rate	0.00%
Original loan balance $300,000 - $449,999 \| Residential whole loans, at fair value \| Fair value \| Maximum
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Interest Rate	10.75%
Original loan balance greater than $449,999 \| Residential whole loans, at fair value \| Carrying value
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Number \| loan	2,760
Balance Sheet Reported Amount	$ 2,348,654
Principal Amount of Loans Subject to Delinquent Principal or Interest	$ 286,120
Original loan balance greater than $449,999 \| Residential whole loans, at fair value \| Carrying value \| Minimum
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Interest Rate	0.88%
Original loan balance greater than $449,999 \| Residential whole loans, at fair value \| Carrying value \| Maximum
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Interest Rate	11.25%
Original loan balance greater than $449,999 \| Residential whole loans, at fair value \| Fair value
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Number \| loan	669
Balance Sheet Reported Amount	$ 379,789
Principal Amount of Loans Subject to Delinquent Principal or Interest	$ 221,669
Original loan balance greater than $449,999 \| Residential whole loans, at fair value \| Fair value \| Minimum
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Interest Rate	1.70%
Original loan balance greater than $449,999 \| Residential whole loans, at fair value \| Fair value \| Maximum
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Interest Rate	10.20%