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Financing Agreements - Borrowings Under Repurchase Agreement and Associated Assets Pledged as Collateral (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Asset Pledged as Collateral with Right    
Assets Sold under Agreements to Repurchase [Line Items]    
Fair value of securities pledged as collateral under financing agreements $ 10,002,392 $ 9,710,754
Asset Pledged as Collateral with Right | Agreements with mark-to-market collateral provisions    
Assets Sold under Agreements to Repurchase [Line Items]    
Fair value of securities pledged as collateral under financing agreements 2,825,847 2,466,787
Mark-to-market financing agreements secured by residential whole loans | Asset Pledged as Collateral with Right    
Assets Sold under Agreements to Repurchase [Line Items]    
Fair value of securities pledged as collateral under financing agreements 8,942,508 8,944,307
Mark-to-market financing agreements secured by residential whole loans | Asset Pledged as Collateral with Right | Agreements with mark-to-market collateral provisions    
Assets Sold under Agreements to Repurchase [Line Items]    
Fair value of securities pledged as collateral under financing agreements 1,775,586 1,733,674
Mark-to-market financing agreements secured by residential whole loans | Held at Fair Value    
Assets Sold under Agreements to Repurchase [Line Items]    
Carrying value $ 1,812,898 $ 1,712,489
Weighted average haircut (percent) 21.03% 20.90%
Mark-to-market financing agreements secured by residential whole loans | Held at Fair Value | Asset Pledged as Collateral with Right    
Assets Sold under Agreements to Repurchase [Line Items]    
Fair value of securities pledged as collateral under financing agreements $ 2,300,813 $ 2,204,239
Mark-to-market financing agreements secured by securities at fair value | Held at Fair Value    
Assets Sold under Agreements to Repurchase [Line Items]    
Carrying value $ 918,472 $ 622,603
Weighted average haircut (percent) 5.78% 8.07%
Mark-to-market financing agreements secured by securities at fair value | Held at Fair Value | Asset Pledged as Collateral with Right    
Assets Sold under Agreements to Repurchase [Line Items]    
Fair value of securities pledged as collateral under financing agreements $ 982,665 $ 689,818
Mark-to-market financing agreements secured by real estate owned | Asset Pledged as Collateral with Right    
Assets Sold under Agreements to Repurchase [Line Items]    
Fair value of securities pledged as collateral under financing agreements 77,219 76,629
Mark-to-market financing agreements secured by real estate owned | Asset Pledged as Collateral with Right | Agreements with mark-to-market collateral provisions    
Assets Sold under Agreements to Repurchase [Line Items]    
Fair value of securities pledged as collateral under financing agreements 67,596 43,295
Mark-to-market financing agreements secured by real estate owned | Held at Fair Value    
Assets Sold under Agreements to Repurchase [Line Items]    
Carrying value $ 40,740 $ 25,163
Weighted average haircut (percent) 45.78% 49.39%
Mark-to-market financing agreements secured by real estate owned | Held at Fair Value | Asset Pledged as Collateral with Right    
Assets Sold under Agreements to Repurchase [Line Items]    
Fair value of securities pledged as collateral under financing agreements $ 75,905 $ 50,365
Non-mark-to-market financing secured by residential whole loans | Held at Fair Value    
Assets Sold under Agreements to Repurchase [Line Items]    
Carrying value $ 678,026 $ 1,216,697
Weighted average haircut (percent) 19.01% 17.65%
Non-mark-to-market financing secured by residential whole loans | Held at Fair Value | Asset Pledged as Collateral with Right    
Assets Sold under Agreements to Repurchase [Line Items]    
Fair value of securities pledged as collateral under financing agreements $ 854,342 $ 1,510,146
Non-mark-to-market financing secured by real estate owned | Held at Fair Value    
Assets Sold under Agreements to Repurchase [Line Items]    
Carrying value $ 0 $ 0
Weighted average haircut (percent) 0.00% 0.00%
Non-mark-to-market financing secured by real estate owned | Held at Fair Value | Asset Pledged as Collateral with Right    
Assets Sold under Agreements to Repurchase [Line Items]    
Fair value of securities pledged as collateral under financing agreements $ 0 $ 0
Non-agency MBS | Agreements with mark-to-market collateral provisions    
Assets Sold under Agreements to Repurchase [Line Items]    
Carrying value 394,700 327,200
Fair value of securities pledged as collateral under financing agreements $ 521,200 $ 465,600