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Mortgage Servicing - Summary of Activity Related to Fair Value Servicing Assets (Footnotes) (Details) - USD ($)
$ in Thousands
12 Months Ended
Feb. 20, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Servicing Assets at Fair Value [Line Items]        
Servicing transfers and adjustments   $ 265,845 $ 7,309 $ 5,880
NRZ        
Servicing Assets at Fair Value [Line Items]        
Servicing transfers and adjustments $ 263,700