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Mortgage Servicing - Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended
Jun. 01, 2021
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Servicing Asset at Amortized Cost [Line Items]        
UPB of portfolio loans acquired $ 46,800,000 $ 75,600,000 $ 31,700,000 $ 14,600,000
Float balances   2,070,000 1,740,000 1,710,000
Purchase of MSRs $ 575,300 844,122 285,134 153,505
Agency and Non-Agency Mortgage Servicing Rights        
Servicing Asset at Amortized Cost [Line Items]        
UPB of MSRs sold   $ 32,000 $ 80,000 $ 140,800