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Commitments, Contingencies, and Guarantees - Additional Information (Details)
$ in Millions
3 Months Ended
Dec. 06, 2019
USD ($)
Mar. 31, 2021
USD ($)
Loan
Dec. 31, 2020
USD ($)
Residential Mortgage      
Commitments Contingencies And Guarantees [Line Items]      
Continuing involvement with transferred financial assets, principal amount outstanding   $ 2,400.0  
Residential mortgage loans repurchased   $ 0.6  
Number of mortgage loans repurchased, pending | Loan   0  
Number of mortgage loans repurchased due to loan servicing activities | Loan   0  
Number of mortgage loans repurchased due to loan servicing activities, pending | Loan   0  
Current residential mortgage loans serviced for third parties as percentage of total   99.00%  
Class Settlement | Settled Litigation      
Commitments Contingencies And Guarantees [Line Items]      
Litigation settlement amount $ 8.0    
Reserve relating to the claim     $ 8.0