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Segment Information - Key Servicing Metrics (Details) - Agency Business - MSRs - USD ($)
 9 Months Ended 12 Months Ended
Sep. 30, 2017
Dec. 31, 2016
Segment Information    
UPB of Servicing Portfolio $ 15,601,225,516 $ 13,555,085,518
Wtd. Avg. Servicing Fee Rate (basis points) 0.48% 0.478%
Wtd. Avg. Life of Servicing Portfolio (in years) 8 years 3 months 18 days 7 years 7 months 6 days
Fannie Mae    
Segment Information    
UPB of Servicing Portfolio $ 12,331,135,405 $ 11,181,152,400
Wtd. Avg. Servicing Fee Rate (basis points) 0.537% 0.534%
Wtd. Avg. Life of Servicing Portfolio (in years) 7 years 2 months 12 days 6 years 7 months 6 days
Freddie Mac    
Segment Information    
UPB of Servicing Portfolio $ 2,732,536,579 $ 1,953,244,541
Wtd. Avg. Servicing Fee Rate (basis points) 0.286% 0.223%
Wtd. Avg. Life of Servicing Portfolio (in years) 10 years 10 months 24 days 10 years 6 months
FHA    
Segment Information    
UPB of Servicing Portfolio $ 537,553,532 $ 420,688,577
Wtd. Avg. Servicing Fee Rate (basis points) 0.165% 0.144%
Wtd. Avg. Life of Servicing Portfolio (in years) 20 years 19 years 2 months 12 days