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Related Party Transactions - Transactions with Cantor Commercial Real Estate, L.P. (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Related Party        
Related Party Transaction        
Mortgage servicing right recognized $ 0.4 $ 0.5 $ 1.3 $ 1.7