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Related Party Transactions - Transactions with CCRE (Details) - USD ($)
$ in Thousands
3 Months Ended
Aug. 16, 2019
Jul. 22, 2019
Mar. 31, 2020
Mar. 31, 2019
Related Party Transaction [Line Items]        
Mortgage servicing right recognized     $ 21,075 $ 14,968
CCRE        
Related Party Transaction [Line Items]        
Recognized related party revenues     200 200
CCRE | Loan Referral Agreement        
Related Party Transaction [Line Items]        
Revenue from loan referral agreement       700
Broker fees and commissions       100
CCRE | Primary Servicing Rights        
Related Party Transaction [Line Items]        
Servicing rights of loans originated     90,700 117,900
Purchase of loans originated     100 300
Mortgage servicing right recognized     $ 1,000 $ 900
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      
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