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Rights to MSRs - Narrative (Details) - USD ($)
$ in Thousands
 1 Months Ended 3 Months Ended
Oct. 04, 2018
Jan. 31, 2018
Sep. 30, 2017
Mar. 31, 2019
Mar. 31, 2018
Servicing Assets at Fair Value [Line Items]          
Proceeds from sale of mortgage servicing rights accounted for as financing   $ 279,600 $ 54,600 $ 577 $ 279,586
Unpaid principal balance on servicing assets acquired $ 42,300,000     $ 4,900,000  
Unpaid principal balance on servicing assets and advances committed to sale $ 3,200,000        
Percentage of mortgage loans servicing that can be terminated 25.00%        
NRZ [Member]          
Servicing Assets at Fair Value [Line Items]          
Percentage UPB of residential assets serviced       50.17798%  
Percentage of loan servicing and subservicing fee revenue from client       72.6617%  
UPB of rights to MSRs sold       $ 25,900,000