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Financing Agreements - Pledged Collateral (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Debt Instrument [Line Items] |  |
Accrued interest on assets | $ 34,900 | $ 30,900
Asset Pledged as Collateral with Right |  |
Debt Instrument [Line Items] |  |
Fair value of securities pledged as collateral under financing agreements | 9,180,009 | 8,057,175
Non-Mark-to-Market | Asset Pledged as Collateral with Right |  |
Debt Instrument [Line Items] |  |
Fair value of securities pledged as collateral under financing agreements | 1,390,220 | 1,331,386
Mark-to-Market | Asset Pledged as Collateral with Right |  |
Debt Instrument [Line Items] |  |
Fair value of securities pledged as collateral under financing agreements | 2,606,244 | 2,654,442
Securitized | Asset Pledged as Collateral with Right |  |
Debt Instrument [Line Items] |  |
Fair value of securities pledged as collateral under financing agreements | 5,183,545 | 4,071,347
Residential whole loans, at carrying value | Asset Pledged as Collateral with Right |  |
Debt Instrument [Line Items] |  |
Fair value of securities pledged as collateral under financing agreements | 1,598,579 | 1,814,780
Residential whole loans, at carrying value | Non-Mark-to-Market | Asset Pledged as Collateral with Right |  |
Debt Instrument [Line Items] |  |
Fair value of securities pledged as collateral under financing agreements | 58,487 | 215,993
Residential whole loans, at carrying value | Mark-to-Market | Asset Pledged as Collateral with Right |  |
Debt Instrument [Line Items] |  |
Fair value of securities pledged as collateral under financing agreements | 346,353 | 284,683
Residential whole loans, at carrying value | Securitized | Asset Pledged as Collateral with Right |  |
Debt Instrument [Line Items] |  |
Fair value of securities pledged as collateral under financing agreements | 1,193,739 | 1,314,104
Residential whole loans, at fair value | Asset Pledged as Collateral with Right |  |
Debt Instrument [Line Items] |  |
Fair value of securities pledged as collateral under financing agreements | 6,823,691 | 5,980,471
Residential whole loans, at fair value | Non-Mark-to-Market | Asset Pledged as Collateral with Right |  |
Debt Instrument [Line Items] |  |
Fair value of securities pledged as collateral under financing agreements | 1,331,733 | 1,095,556
Residential whole loans, at fair value | Mark-to-Market | Asset Pledged as Collateral with Right |  |
Debt Instrument [Line Items] |  |
Fair value of securities pledged as collateral under financing agreements | 1,534,207 | 2,164,158
Residential whole loans, at fair value | Securitized | Asset Pledged as Collateral with Right |  |
Debt Instrument [Line Items] |  |
Fair value of securities pledged as collateral under financing agreements | 3,957,751 | 2,720,757
Securities, at fair value | Asset Pledged as Collateral with Right |  |
Debt Instrument [Line Items] |  |
Fair value of securities pledged as collateral under financing agreements | 678,801 | 177,111
Securities, at fair value | Non-Mark-to-Market | Asset Pledged as Collateral with Right |  |
Debt Instrument [Line Items] |  |
Fair value of securities pledged as collateral under financing agreements | 0 | 0
Securities, at fair value | Mark-to-Market | Asset Pledged as Collateral with Right |  |
Debt Instrument [Line Items] |  |
Fair value of securities pledged as collateral under financing agreements | 678,801 | 177,111
Securities, at fair value | Securitized | Asset Pledged as Collateral with Right |  |
Debt Instrument [Line Items] |  |
Fair value of securities pledged as collateral under financing agreements | 0 | 0
Other assets: REO | Asset Pledged as Collateral with Right |  |
Debt Instrument [Line Items] |  |
Fair value of securities pledged as collateral under financing agreements | 78,938 | 84,813
Other assets: REO | Non-Mark-to-Market | Asset Pledged as Collateral with Right |  |
Debt Instrument [Line Items] |  |
Fair value of securities pledged as collateral under financing agreements | 0 | 19,837
Other assets: REO | Mark-to-Market | Asset Pledged as Collateral with Right |  |
Debt Instrument [Line Items] |  |
Fair value of securities pledged as collateral under financing agreements | 46,883 | 28,490
Other assets: REO | Securitized | Asset Pledged as Collateral with Right |  |
Debt Instrument [Line Items] |  |
Fair value of securities pledged as collateral under financing agreements | $ 32,055 | $ 36,486

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