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Related Party Transactions - Transactions with CCRE (Details) - USD ($)
12 Months Ended
Aug. 16, 2019
Jul. 22, 2019
Sep. 08, 2017
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Related Party Transaction [Line Items]            
Mortgage servicing right recognized       $ 88,836,000 $ 79,062,000 $ 85,030,000
CCRE            
Related Party Transaction [Line Items]            
Recognized related party revenues       300,000 0 100,000
CCRE | Loan Referral Agreement            
Related Party Transaction [Line Items]            
Revenue from loan referral agreement       2,600,000 2,200,000 2,100,000
Broker fees and commissions       1,400,000 800,000 800,000
CCRE | Primary Servicing Rights            
Related Party Transaction [Line Items]            
Servicing rights of loans originated       1,200,000,000 1,200,000,000  
Purchase of loans originated       1,500,000 2,500,000  
Mortgage servicing right recognized       $ 3,800,000 $ 3,800,000 $ 3,800,000
BGC Holdings, L.P. | BPF            
Related Party Transaction [Line Items]            
Total consideration transferred     $ 875,000,000.0      
Business acquisition price paid in units (in shares)     3,200,000      
BGC Holdings, L.P. | BPF | CCRE            
Related Party Transaction [Line Items]            
Amount of transaction     89,100,000      
Net assets exceeded     $ 508,600,000      
Third Party Bank And Cantor Commercial Real Estate LP            
Related Party Transaction [Line Items]            
Amount of loan purchased by third-party 80.00%          
Amount of loan retained by third-party 20.00%          
Interest rate on loans receivable   4.38%        
Fee paid to Newmark for brokering loan   $ 700,000        
Third Party Bank And Cantor Commercial Real Estate LP | Mr. Gosin            
Related Party Transaction [Line Items]            
Ownership interest of loans receivable   19.00%        
Real Estate Loan | Third Party Bank And Cantor Commercial Real Estate LP            
Related Party Transaction [Line Items]            
Commercial real estate loan   $ 146,600,000