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Mortgage Servicing - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Transfers and Servicing [Abstract]      
UPB of MSRs sold $ 7.2 $ 17.6  
Float balances 2,400.0 1,900.0 $ 1,700.0
UPB of loans acquired $ 6,000.0 $ 2,900.0