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Real Estate Securities - Trading Securities by Collateral Type (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Investment Holdings [Line Items]          
Real estate securities, at fair value $ 116,933   $ 116,933   $ 170,619
Unpaid principal balance 220,888   220,888   235,306
Principal balance of securities acquired (1) 0 $ 10,750 0 $ 28,380  
Principal balance of securities sold (1) 0 750 12,716 53,561  
Net market valuation gains (losses) recorded (12,521) 1,578 (30,019) 24,725  
Securities bought and sold during the same quarter   $ 1,000   $ 3,000  
Senior IO Securities          
Investment Holdings [Line Items]          
Real estate securities, at fair value 28,860   28,860   21,787
Unpaid principal balance 0   0   0
Subordinate          
Investment Holdings [Line Items]          
Real estate securities, at fair value 88,073   88,073   148,832
Unpaid principal balance 220,888   220,888   235,306
Interest Only Senior Trading Securities | Senior IO Securities          
Investment Holdings [Line Items]          
Real estate securities, at fair value 28,860   28,860   21,787
Interest Only Senior Trading Securities | Senior IO Securities | Sequoia          
Investment Holdings [Line Items]          
Real estate securities, at fair value 25,000   25,000   15,000
RPL securities | Subordinate          
Investment Holdings [Line Items]          
Real estate securities, at fair value 31,963   31,963   65,140
Consolidated Agency multifamily loans, at fair value | Subordinate          
Investment Holdings [Line Items]          
Real estate securities, at fair value 8,021   8,021   10,549
Other third-party residential securities | Subordinate          
Investment Holdings [Line Items]          
Real estate securities, at fair value $ 48,089   $ 48,089   $ 73,143