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Related Party Transactions - Transactions with CCRE (Details) - USD ($)
12 Months Ended
Aug. 16, 2019
Jul. 22, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Related Party Transaction          
Purchase of mortgage servicing rights     $ 200,000 $ 1,489,000 $ 3,107,000
Mortgage servicing right recognized     116,100,000 88,836,000 79,062,000
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      
Mr. Gosin | Third Party Bank And Cantor Commercial Real Estate LP          
Related Party Transaction          
Ownership interest of loans receivable (in percentage)   19.00%      
CCRE          
Related Party Transaction          
Recognized related party revenues     600,000 800,000  
CCRE | Loan Referral Agreement          
Related Party Transaction          
Revenue from loan referral agreement     0 2,600,000 2,200,000
Broker fees and commissions       1,400,000 800,000
CCRE | Primary Servicing Rights          
Related Party Transaction          
MSR acquired     227,000,000.0 1,200,000,000  
Purchase of mortgage servicing rights     200,000 1,500,000  
Mortgage servicing right recognized     $ 3,800,000 $ 3,800,000 $ 3,800,000