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Financing Agreements - Financing Agreements (Details) - USD ($) $ in Thousands | 6 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 30, 2023 | Sep. 30, 2023 | Dec. 31, 2022
Financing Agreements [Line Items] |  |  |
Unpaid Principal Balance |  | $ 8,296,145 | $ 7,043,944
Fair Value / Carrying Value |  | $ 8,037,973 | $ 6,812,086
Weighted Average Cost of Funding (in Percent) |  | 4.18% | 3.70%
Agreements with mark-to-market collateral provisions |  |  |
Financing Agreements [Line Items] |  |  |
Unpaid Principal Balance |  | $ 2,362,351 | $ 2,223,298
Fair Value / Carrying Value |  | $ 2,361,488 | $ 2,223,047
Weighted Average Cost of Funding (in Percent) |  | 7.17% | 5.73%
Agreements with mark-to-market collateral provisions | 0-3 Months |  |  |
Financing Agreements [Line Items] |  |  |
Unpaid Principal Balance |  | $ 1,428,655 |
Agreements with mark-to-market collateral provisions | 3-6 Months |  |  |
Financing Agreements [Line Items] |  |  |
Unpaid Principal Balance |  | 128,124 |
Agreements with mark-to-market collateral provisions | 6-12 Months |  |  |
Financing Agreements [Line Items] |  |  |
Unpaid Principal Balance |  | 465,641 |
Fair Value / Carrying Value |  | $ 339,900 |
Extension period |  | 1 year |
Agreements with mark-to-market collateral provisions | Greater than 12 Months |  |  |
Financing Agreements [Line Items] |  |  |
Unpaid Principal Balance |  | $ 339,931 |
Fair Value / Carrying Value |  | 831,200 |
Agreements with mark-to-market collateral provisions | Estimated Fair Value |  |  |
Financing Agreements [Line Items] |  |  |
Financing agreements, amortized cost |  | 505,700 | $ 578,900
Agreements with mark-to-market collateral provisions | Estimated Fair Value | Held at Fair Value |  |  |
Financing Agreements [Line Items] |  |  |
Fair Value / Carrying Value |  |  | 578,900
Agreements with mark-to-market collateral provisions | Residential Whole Loans and REO |  |  |
Financing Agreements [Line Items] |  |  |
Unpaid Principal Balance |  | 1,753,355 | 2,111,647
Fair Value / Carrying Value |  | $ 1,752,492 | $ 2,111,396
Weighted Average Cost of Funding (in Percent) |  | 7.55% | 5.74%
Weighted Average Term to Maturity (Months) | 6 months 27 days | 10 months 12 days |
Agreements with mark-to-market collateral provisions | Residential Whole Loans and REO | 0-3 Months |  |  |
Financing Agreements [Line Items] |  |  |
Unpaid Principal Balance |  | $ 819,659 |
Agreements with mark-to-market collateral provisions | Residential Whole Loans and REO | 3-6 Months |  |  |
Financing Agreements [Line Items] |  |  |
Unpaid Principal Balance |  | 128,124 |
Agreements with mark-to-market collateral provisions | Residential Whole Loans and REO | 6-12 Months |  |  |
Financing Agreements [Line Items] |  |  |
Unpaid Principal Balance |  | 465,641 |
Agreements with mark-to-market collateral provisions | Residential Whole Loans and REO | Greater than 12 Months |  |  |
Financing Agreements [Line Items] |  |  |
Unpaid Principal Balance |  | 339,931 |
Agreements with mark-to-market collateral provisions | Residential Whole Loans and REO | Not Held at Fair Value |  |  |
Financing Agreements [Line Items] |  |  |
Fair Value / Carrying Value |  | 505,700 |
Agreements with mark-to-market collateral provisions | Securities |  |  |
Financing Agreements [Line Items] |  |  |
Unpaid Principal Balance |  | 608,996 | $ 111,651
Fair Value / Carrying Value |  | $ 608,996 | $ 111,651
Weighted Average Cost of Funding (in Percent) |  | 5.83% | 5.47%
Weighted Average Term to Maturity (Months) | 1 month 15 days | 9 days |
Agreements with mark-to-market collateral provisions | Securities | 0-3 Months |  |  |
Financing Agreements [Line Items] |  |  |
Unpaid Principal Balance |  | $ 608,996 |
Agreements with mark-to-market collateral provisions | Securities | 3-6 Months |  |  |
Financing Agreements [Line Items] |  |  |
Unpaid Principal Balance |  | 0 |
Agreements with mark-to-market collateral provisions | Securities | 6-12 Months |  |  |
Financing Agreements [Line Items] |  |  |
Unpaid Principal Balance |  | 0 |
Agreements with mark-to-market collateral provisions | Securities | Greater than 12 Months |  |  |
Financing Agreements [Line Items] |  |  |
Unpaid Principal Balance |  | 0 |
Agreements with Non-mark-to-market Collateral Provisions | Estimated Fair Value |  |  |
Financing Agreements [Line Items] |  |  |
Fair Value / Carrying Value |  |  | $ 884,500
Financing agreements, amortized cost |  | 401,400 | 884,500
Agreements with Non-mark-to-market Collateral Provisions | Residential Whole Loans and REO |  |  |
Financing Agreements [Line Items] |  |  |
Unpaid Principal Balance |  | 1,125,773 | 1,004,260
Fair Value / Carrying Value |  | $ 1,124,953 | $ 1,003,604
Weighted Average Cost of Funding (in Percent) |  | 7.88% | 6.53%
Weighted Average Term to Maturity (Months) | 16 months 24 days | 14 months 9 days |
Agreements with Non-mark-to-market Collateral Provisions | Residential Whole Loans and REO | 0-3 Months |  |  |
Financing Agreements [Line Items] |  |  |
Unpaid Principal Balance |  | $ 447,996 |
Agreements with Non-mark-to-market Collateral Provisions | Residential Whole Loans and REO | 3-6 Months |  |  |
Financing Agreements [Line Items] |  |  |
Unpaid Principal Balance |  | 0 |
Agreements with Non-mark-to-market Collateral Provisions | Residential Whole Loans and REO | 6-12 Months |  |  |
Financing Agreements [Line Items] |  |  |
Unpaid Principal Balance |  | 27,367 |
Agreements with Non-mark-to-market Collateral Provisions | Residential Whole Loans and REO | Greater than 12 Months |  |  |
Financing Agreements [Line Items] |  |  |
Unpaid Principal Balance |  | 650,410 |
Agreements with Non-mark-to-market Collateral Provisions | Residential Whole Loans and REO | Held at Fair Value |  |  |
Financing Agreements [Line Items] |  |  |
Fair Value / Carrying Value |  | $ 401,400 |
Securities | Estimated Fair Value |  |  |
Financing Agreements [Line Items] |  |  |
Fair Value / Carrying Value |  |  | $ 2,400,000
Weighted Average Cost of Funding (in Percent) |  | (1.41%) | (0.84%)
Financing agreements, amortized cost |  | $ 3,700,000 | $ 2,600,000
Securities | Residential Whole Loans and REO |  |  |
Financing Agreements [Line Items] |  |  |
Unpaid Principal Balance |  | 4,588,432 | 3,586,397
Fair Value / Carrying Value |  | $ 4,332,936 | $ 3,357,590
Weighted Average Cost of Funding (in Percent) |  | 3.98% | 3.33%
Securities | Residential Whole Loans and REO | Held at Fair Value |  |  |
Financing Agreements [Line Items] |  |  |
Fair Value / Carrying Value |  | $ 3,500,000 |
Convertible senior notes | Unsecured |  |  |
Financing Agreements [Line Items] |  |  |
Unpaid Principal Balance |  |  | $ 229,989
Fair Value / Carrying Value |  | $ 218,596 | $ 227,845
Weighted Average Cost of Funding (in Percent) |  | 6.94% | 6.94%
Weighted Average Term to Maturity (Months) | 17 months 15 days | 8 months 15 days |
Impact of net Swap carry | Unsecured |  |  |
Financing Agreements [Line Items] |  |  |
Unpaid Principal Balance |  |  |
Fair Value / Carrying Value |  |  |
Weighted Average Cost of Funding (in Percent) |  | (1.41%) | (0.84%)

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