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Real Estate Securities - Trading Securities by Collateral Type (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Investment Holdings [Line Items]          
Real estate securities, at fair value $ 133,780   $ 133,780   $ 170,619
Unpaid principal balance 221,473   221,473   235,306
Principal balance of securities acquired (1) 0 $ 1,750 0 $ 17,630  
Principal balance of securities sold (1) 12,716 18,068 12,716 52,811  
Net market valuation gains (losses) recorded (16,042) 1,798 (17,498) 23,147  
Securities bought and sold during the same quarter 0 $ 0 2,000 $ 2,000  
Senior IO Securities          
Investment Holdings [Line Items]          
Real estate securities, at fair value 31,498   31,498   21,787
Unpaid principal balance 0   0   0
Subordinate          
Investment Holdings [Line Items]          
Real estate securities, at fair value 102,282   102,282   148,832
Unpaid principal balance 221,473   221,473   235,306
Interest Only Senior Trading Securities | Senior IO Securities          
Investment Holdings [Line Items]          
Real estate securities, at fair value 31,498   31,498   21,787
Interest Only Senior Trading Securities | Senior IO Securities | Sequoia          
Investment Holdings [Line Items]          
Real estate securities, at fair value 24,000   24,000   15,000
RPL securities | Subordinate          
Investment Holdings [Line Items]          
Real estate securities, at fair value 46,607   46,607   65,140
Consolidated Agency multifamily loans, at fair value | Subordinate          
Investment Holdings [Line Items]          
Real estate securities, at fair value 7,960   7,960   10,549
Other third-party residential securities | Subordinate          
Investment Holdings [Line Items]          
Real estate securities, at fair value $ 47,715   $ 47,715   $ 73,143