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Related Party Transactions - Transactions with CCRE (Details) - USD ($)
3 Months Ended 12 Months Ended
Aug. 16, 2019
Jul. 22, 2019
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
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          
Related Party | Primary Servicing Rights              
Related Party Transaction              
MSR acquired     $ 0 $ 0 $ 0 $ 0  
Mortgage servicing right recognized         $ 2,700,000 $ 3,600,000 $ 3,600,000
Barry M. Gosin | Third Party Bank And Cantor Commercial Real Estate LP              
Related Party Transaction              
Ownership interest of loans receivable (in percentage)   19.00%