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Related Party Transactions - Transactions with CCRE (Details) - USD ($)
3 Months Ended
Aug. 16, 2019
Jul. 22, 2019
Mar. 31, 2022
Mar. 31, 2021
Related Party Transaction        
Mortgage servicing right recognized     $ 18,300,000 $ 18,677,000
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%      
Fee paid to Newmark for brokering loan $ 700,000      
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     $ 900,000 900,000
Affiliated Persons or Entities | Revenue Share Agreeement | CCRE        
Related Party Transaction        
Revenue from loan referral agreement       $ 500,000
Barry M. Gosin | Third Party Bank And Cantor Commercial Real Estate LP        
Related Party Transaction        
Ownership interest of loans receivable (in percentage)   19.00%