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Related Party Transactions - Transactions with CCRE (Details) - USD ($)
12 Months Ended
Aug. 16, 2019
Jul. 22, 2019
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Related Party Transaction          
Mortgage servicing right recognized     $ 74,573,000 $ 89,075,000 $ 116,100,000
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  
CCRE | Primary Servicing Rights          
Related Party Transaction          
MSR acquired     0 0  
Mortgage servicing right recognized     3,600,000 3,600,000 3,800,000
Affiliated Persons or Entities | Revenue Share Agreeement | CCRE          
Related Party Transaction          
Revenue from loan referral agreement     $ 0 $ 0 $ 0
Barry M. Gosin | Third Party Bank And Cantor Commercial Real Estate LP          
Related Party Transaction          
Ownership interest of loans receivable (in percentage)   19.00%