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Mortgage Servicing - Narrative (Details)
$ in Millions
6 Months Ended
Jun. 30, 2019
USD ($)
loan
Jun. 30, 2018
USD ($)
Transfers and Servicing [Abstract]    
Portfolio of loans acquired | loan 45,307  
UPB of loans acquired $ 10,800.0  
Portfolio of loans sold | loan 307  
UPB of MSRs sold $ 100.1  
Float balances $ 2,000.0 $ 1,700.0