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Related Party Transactions - Transactions with CCRE (Details) - USD ($)
3 Months Ended 9 Months Ended
Aug. 16, 2019
Jul. 22, 2019
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Related Party Transaction            
Revenues     $ 616,283,000 $ 664,646,000 $ 1,722,926,000 $ 2,098,245,000
Third Party Bank And Cantor Commercial Real Estate LP            
Related Party Transaction            
Amount of loan purchased by third-party (in percentage) 80.00%          
Amount of loan retained by third-party (in percentage) 20.00%          
Interest rate on loans receivable (in percentage) 4.38%          
Real Estate Loan | Third Party Bank And Cantor Commercial Real Estate LP            
Related Party Transaction            
Commercial real estate loan   $ 146,600,000        
Related Party | Revenue Share Agreeement            
Related Party Transaction            
Revenues     0 0 0 0
Related Party | Loan Referral Agreement            
Related Party Transaction            
Revenues     0 0 0 0
Related Party | Primary Servicing Rights            
Related Party Transaction            
MSR acquired     0 0 0 0
Mortgage servicing right recognized     $ 600,000 $ 800,000 $ 2,100,000 $ 2,700,000
Barry M. Gosin | Third Party Bank And Cantor Commercial Real Estate LP            
Related Party Transaction            
Ownership interest of loans receivable (in percentage)   19.00%