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Financing Agreements - Borrowings Under Repurchase Agreement And Associated Assets Pledged as Collateral (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Asset Pledged as Collateral with Right    
Assets Sold under Agreements to Repurchase [Line Items]    
Fair value of securities pledged as collateral under financing agreements $ 9,180,009 $ 8,057,175
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 1,598,579 1,814,780
Mark-to-market financing agreements secured by residential whole loans | Held at Fair Value    
Assets Sold under Agreements to Repurchase [Line Items]    
Carrying value $ 1,725,473 $ 2,095,002
Weighted average haircut (percent) 19.18% 18.33%
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 $ 2,172,992 $ 2,632,489
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 $ 608,996 $ 111,651
Weighted average haircut (percent) 9.28% 37.43%
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 $ 678,801 $ 177,111
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 78,938 84,813
Mark-to-market financing agreements secured by real estate owned | Held at Fair Value    
Assets Sold under Agreements to Repurchase [Line Items]    
Carrying value $ 27,018 $ 16,394
Weighted average haircut (percent) 48.66% 48.07%
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 $ 53,715 $ 33,367
Non-mark-to-market financing secured by residential whole loans | Held at Fair Value    
Assets Sold under Agreements to Repurchase [Line Items]    
Carrying value $ 1,124,953 $ 994,494
Weighted average haircut (percent) 17.43% 21.43%
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 $ 1,385,261 $ 1,301,685
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 $ 9,109
Weighted average haircut (percent) 0.00% 60.23%
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 $ 22,902