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Financing Agreements - Pledged Collateral (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Asset Pledged as Collateral with Right |  |
Debt Instrument [Line Items] |  |
Fair value of securities pledged as collateral under financing agreements | $ 10,002,392 | $ 9,710,754
Accrued interest | 31,800 | 36,400
Securitized | Asset Pledged as Collateral with Right |  |
Debt Instrument [Line Items] |  |
Fair value of securities pledged as collateral under financing agreements | 6,322,900 | 5,730,063
Non-Mark-to-Market | Asset Pledged as Collateral with Right |  |
Debt Instrument [Line Items] |  |
Fair value of securities pledged as collateral under financing agreements | 853,645 | 1,513,904
Mark-to-Market | Asset Pledged as Collateral with Right |  |
Debt Instrument [Line Items] |  |
Fair value of securities pledged as collateral under financing agreements | 2,825,847 | 2,466,787
Residential whole loans | Asset Pledged as Collateral with Right |  |
Debt Instrument [Line Items] |  |
Fair value of securities pledged as collateral under financing agreements | 8,942,508 | 8,944,307
Residential whole loans | Securitized | Asset Pledged as Collateral with Right |  |
Debt Instrument [Line Items] |  |
Fair value of securities pledged as collateral under financing agreements | 6,313,277 | 5,696,729
Residential whole loans | Non-Mark-to-Market | Asset Pledged as Collateral with Right |  |
Debt Instrument [Line Items] |  |
Fair value of securities pledged as collateral under financing agreements | 853,645 | 1,513,904
Residential whole loans | Mark-to-Market | Asset Pledged as Collateral with Right |  |
Debt Instrument [Line Items] |  |
Fair value of securities pledged as collateral under financing agreements | 1,775,586 | 1,733,674
Securities, at fair value | Asset Pledged as Collateral with Right |  |
Debt Instrument [Line Items] |  |
Fair value of securities pledged as collateral under financing agreements | 982,665 | 689,818
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
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 | 982,665 | 689,818
Other assets: REO | Asset Pledged as Collateral with Right |  |
Debt Instrument [Line Items] |  |
Fair value of securities pledged as collateral under financing agreements | 77,219 | 76,629
Other assets: REO | Securitized | Asset Pledged as Collateral with Right |  |
Debt Instrument [Line Items] |  |
Fair value of securities pledged as collateral under financing agreements | 9,623 | 33,334
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 | 0
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 | 67,596 | 43,295
Non-agency MBS | Mark-to-Market |  |
Debt Instrument [Line Items] |  |
Fair value of securities pledged as collateral under financing agreements | 521,200 | 465,600
Securities Sold under Agreements to Repurchase | $ 394,700 | $ 327,200

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