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Schedule IV - Mortgage Loans on Real Estate (Details) | 12 Months Ended |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2023 USD ($) loan | Sep. 30, 2023 USD ($) | Jun. 30, 2023 USD ($) | Mar. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Sep. 30, 2022 USD ($) | Jun. 30, 2022 USD ($) | Mar. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |  |
Allowance for credit loss | $ 20,451,000 | $ 28,557,000 | $ 31,035,000 | $ 33,062,000 | $ 35,314,000 | $ 37,192,000 | $ 36,927,000 | $ 35,457,000 | $ 39,447,000
Residential Whole Loans |  |  |  |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |  |
Number | loan | 25,401 |  |  |  |  |  |  |  |
Balance Sheet Reported Amount | $ 8,958,089,000 |  |  |  |  |  |  |  |
Principal Amount of Loans Subject to Delinquent Principal or Interest | 508,513,000 |  |  |  |  |  |  |  |
Allowance for credit loss | 20,500,000 |  |  |  |  |  |  |  |
Loans, fair value | 103,700,000 |  |  |  |  |  |  |  |
Tax basis of loans | 4,200,000,000 |  |  |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward] |  |  |  |  |  |  |  |  |
Beginning Balance | 7,518,739,000 |  |  |  |  |  |  |  |
Additions during period: |  |  |  |  |  |  |  |  |
Purchases | 2,986,617,000 |  |  |  |  |  |  |  |
Premium amortization/discount accretion, net | 13,819,000 |  |  |  |  |  |  |  |
Reversal of provision for loan loss | 14,863,000 |  |  |  |  |  |  |  |
Changes in fair value recorded in gain/(loss) on loans recorded at fair value | 114,065,000 |  |  |  |  |  |  |  |
Deductions during period: |  |  |  |  |  |  |  |  |
Repayments | (1,437,711,000) |  |  |  |  |  |  |  |
Loan sales and repurchases | (94,624,000) |  |  |  |  |  |  |  |
Impairment on carrying value loans | (1,240,000) |  |  |  |  |  |  |  |
Transfer to REO | (73,236,000) |  |  |  |  |  |  |  |
Ending Balance | $ 9,041,292,000 |  |  |  |  |  |  |  |
Residential Whole Loans | Original loan balance $0 - $149,999 |  |  |  |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |  |
Number | loan | 7,596 |  |  |  |  |  |  |  |
Balance Sheet Reported Amount | $ 663,042,000 |  |  |  |  |  |  |  |
Principal Amount of Loans Subject to Delinquent Principal or Interest | $ 45,934,000 |  |  |  |  |  |  |  |
Residential Whole Loans | Original loan balance $0 - $149,999 | 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 |  |  |  |  |  |  |  |
Residential Whole Loans | Original loan balance $0 - $149,999 | Maximum |  |  |  |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |  |
Interest Rate | 16.00% |  |  |  |  |  |  |  |
Original loan balance | $ 149,999 |  |  |  |  |  |  |  |
Residential Whole Loans | Original loan balance $150,000 - $299,999 |  |  |  |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |  |
Number | loan | 8,130 |  |  |  |  |  |  |  |
Balance Sheet Reported Amount | $ 1,474,946,000 |  |  |  |  |  |  |  |
Principal Amount of Loans Subject to Delinquent Principal or Interest | $ 105,669,000 |  |  |  |  |  |  |  |
Residential Whole Loans | Original loan balance $150,000 - $299,999 | 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 |  |  |  |  |  |  |  |
Residential Whole Loans | Original loan balance $150,000 - $299,999 | Maximum |  |  |  |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |  |
Interest Rate | 14.65% |  |  |  |  |  |  |  |
Original loan balance | $ 299,999 |  |  |  |  |  |  |  |
Residential Whole Loans | Original loan balance $300,000 - $449,999 |  |  |  |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |  |
Number | loan | 3,840 |  |  |  |  |  |  |  |
Balance Sheet Reported Amount | $ 1,151,268,000 |  |  |  |  |  |  |  |
Principal Amount of Loans Subject to Delinquent Principal or Interest | $ 90,826,000 |  |  |  |  |  |  |  |
Residential Whole Loans | Original loan balance $300,000 - $449,999 | 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 |  |  |  |  |  |  |  |
Residential Whole Loans | Original loan balance $300,000 - $449,999 | Maximum |  |  |  |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |  |
Interest Rate | 13.88% |  |  |  |  |  |  |  |
Original loan balance | $ 449,999 |  |  |  |  |  |  |  |
Residential Whole Loans | Original loan balance greater than $449,999 |  |  |  |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |  |
Number | loan | 5,835 |  |  |  |  |  |  |  |
Balance Sheet Reported Amount | $ 5,668,833,000 |  |  |  |  |  |  |  |
Principal Amount of Loans Subject to Delinquent Principal or Interest | 266,084,000 |  |  |  |  |  |  |  |
Original loan balance | $ 449,999 |  |  |  |  |  |  |  |
Residential Whole Loans | Original loan balance greater than $449,999 | Minimum |  |  |  |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |  |
Interest Rate | 0.70% |  |  |  |  |  |  |  |
Residential Whole Loans | Original loan balance greater than $449,999 | Maximum |  |  |  |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |  |
Interest Rate | 15.00% |  |  |  |  |  |  |  |

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