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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, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Related Party Transaction            
Mortgage servicing right recognized     $ 21,455,000 $ 26,386,000 $ 57,719,000 $ 60,508,000
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        
CCRE | Loan Referral Agreement            
Related Party Transaction            
Revenue from loan referral agreement     0 0 0 0
CCRE | Primary Servicing Rights            
Related Party Transaction            
MSR acquired     0 0 0 0
Mortgage servicing right recognized     800,000 900,000 2,700,000 2,700,000
Affiliated Persons or Entities | Revenue Share Agreeement | CCRE            
Related Party Transaction            
Revenue from loan referral agreement     $ 0 $ 700,000 $ 0 $ 1,700,000
Barry M. Gosin | Third Party Bank And Cantor Commercial Real Estate LP            
Related Party Transaction            
Ownership interest of loans receivable (in percentage)   19.00%